From a6d5624a8b3df98cb0678be67b077e88ed8750eb Mon Sep 17 00:00:00 2001 From: Gwenhael Le Moine Date: Tue, 19 Mar 2024 23:35:30 +0100 Subject: [PATCH] 2019-10-16: Updated to version 1.62 Signed-off-by: Gwenhael Le Moine --- DEBUGGER.TXT | 39 +- Emu48.htm => EMU48.HTM | 240 +- Emu48.exe | Bin 319488 -> 323584 bytes KML_20.DOC | 105 +- PROBLEMS.TXT | 4 +- Sources/Emu48/CHANGES.TXT | 80 + Sources/Emu48/DEBUGGER.C | 397 ++- Sources/Emu48/DISPLAY.C | 4 +- Sources/Emu48/EMU48.C | 48 +- Sources/Emu48/EMU48.DSP | 2 +- Sources/Emu48/EMU48.H | 4 +- Sources/Emu48/EMU48.RC | 49 +- Sources/Emu48/ENGINE.C | 6 + Sources/Emu48/FILES.C | 90 +- Sources/Emu48/KML.C | 19 +- Sources/Emu48/LODEPNG.C | 4400 +++++++++++++++++----------------- Sources/Emu48/LODEPNG.H | 3723 ++++++++++++++-------------- Sources/Emu48/RESOURCE.H | 18 +- Sources/GCCPatch/EMU48GCC.RC | 51 +- Sources/GCCPatch/Makefile | 1 + Sources/GCCPatch/README.TXT | 2 +- beep.48 | 1 - uninst.exe | Bin 66850 -> 66850 bytes 23 files changed, 5068 insertions(+), 4215 deletions(-) rename Emu48.htm => EMU48.HTM (74%) diff --git a/DEBUGGER.TXT b/DEBUGGER.TXT index 1d7ec4c..e34fce8 100644 --- a/DEBUGGER.TXT +++ b/DEBUGGER.TXT @@ -177,7 +177,30 @@ If this item is checked, interrupt handler code will be skipped. This option is You can also use this option if you want to quit the interrupt handler. Just check this option, press F7 for "Step Into" for stopping the debugger behind the RTI instruction, and uncheck this option again. -5.) Menu Info +5.) Menu Trace + +- Settings... + +This opens a dialog to configure the trace file output. + +The "Log File:" editbox contains the log output file. A filename without the file path save the file in the emulator installation directory. + +For "File Mode" select "New" for creating a new empty trace file or select "Append" for appending the new trace output when trace is enabled. If you chosen "Append" and the trace file don't exists, a new trace file is created. + +The "Logging" checkboxes "Register", "MMU" and "Opcode" determine the output content of the trace file. + +"Register" enables printing the CPU register content in front of the disassembled opcode. For some, mainly size output reasons the content of the "Write Only Registers" are not shown. + +"MMU" enables printing the MMU register content between register and disassembly. + +"Opcode" enables the opcode output in the disassembled and if necessary in the following lines. + +- Enable + +If this item is checked, the file trace is enabled. Dependent on the "File Mode" setting, a "New" empty trace file is generated or in "Append" Mode additional data is appended to the current log file. Unchecking this item stops logging and flushing the trace file. + + +6.) Menu Info - Last Instructions... @@ -192,7 +215,7 @@ This opens a small toolbox window which shows the number of CPU cycles and the c Some of the display registers have a different meaning on reading and writing. This dialog shows the data written to the write only I/O registers. -6.) Code window +7.) Code window This windows shows you the disassembled code. The line with the current PC is marked with a "->" or "-R" between the address and the disassembly. @@ -229,14 +252,14 @@ Search for a PCO before the address shown in the first line of the Code window. Search for a PCO behind the address shown in the first line of the Code window. -7.) Register window +8.) Register window Here you can see the actual contents of the CPU registers. The values are only updated at a program execution stop. All changed CPU registers are highlighted. With the left mouse button you change the content of the register. On bit registers, like CY and Mode, the state change immediately without any request. -8.) Memory window +9.) Memory window This windows shows the memory content in the selected context. @@ -330,7 +353,7 @@ The "Save Memory Data" dialog box allows saving the data of the specified Saturn This opens a small toolbox window showing the decompiled RPL object in the selected memory map mode at the memory address marked by the cursor. If the toolbox window is already open the content will be updated. There's a problem if you want to select an address inside the marked two addresses. The easiest way to switch the address is the use of the + and - keys changing the memory position by one nibble under the cursor. -9.) Stack window +10.) Stack window The content of the hardware stack is viewed here. In "1:" is the current return address. A double click on an item shows the address content in the Code window. @@ -349,7 +372,7 @@ Pop the selected element from the stack. Modifies the stack content of the current selection. -10.) MMU window +11.) MMU window The configuration of the memory controllers is viewed here. The viewed addresses are the first address of each module area and may differ from the given address in the CONFIG command. @@ -363,11 +386,11 @@ This example will config a 128KB module at address #80000 and not at the given address. So the MMU viewer will show you the address #80000. -11.) Miscellaneous window +12.) Miscellaneous window The Miscellaneous window show you the internal state of the interrupt flag, the 1ms keyboard handler and the contents of the Bank Switcher latch. The Bank Switcher item is only enabled on calculators with a latch inside. You see the loaded value of the address lines A6-A0. You have to ignore the last bit (A0), because it isn't wired to the six bit latch. You can change the values by pressing the left mouse button over the old content. -01/09/13 (c) by Christoph Gießelink +08/12/19 (c) by Christoph Gießelink diff --git a/Emu48.htm b/EMU48.HTM similarity index 74% rename from Emu48.htm rename to EMU48.HTM index df540d5..241bc43 100644 --- a/Emu48.htm +++ b/EMU48.HTM @@ -87,28 +87,32 @@ h3 { color:red; font-size:1.1em; }

1. General

-

Emu48 is an emulator for the Hewlett Packard HP38G, HP39G, - HP40G, HP48SX, HP48GX and HP49G calculator hardware. These calculators - are based on the 1LT8 Clarke (HP48SX) and on the Yorke chip.

+

Emu48 is an + emulator for the Hewlett Packard HP38G, HP39G, HP40G, HP48SX, HP48GX + and HP49G calculator hardware. These calculators are based on the + 1LT8 Clarke (HP48SX) and on the Yorke chip.

2. Acknowledgements

First of all a big thank to Sébastien Carlier for publishing Emu48 v1.0 under the GPL. Without this decision newer versions of the emulator wouldn't have been possible or ports to other similar calculators wouldn't have been made. Also a big thank to Jean-Yves Avenard for his technical assistance in the beginning. Lode Vandevenne - spend the PNG image decoder and finally I want to thank all the + spent the PNG image decoder and finally I want to thank all the unnamed authors for publishing material about these calculators.

3. ROM Images

-

Emu48 needs an image of a calculator ROM to be able to run. ROM - images are valid in a packed (even address lower nibble, odd address - higher nibble) or unpacked (one nibble per byte with even address first) +

Emu48 needs a ROM + image for each calculator model you want to emulate. ROM images + are valid in a packed (even address lower nibble, odd address higher + nibble) or unpacked (one nibble per byte with even address first) form.

Since fall 2000 the emulator ROM's for the HP38, 39, 40, 48 and 49 are freely available on different Internet sites. Because there's no license for the distribution of the ROM images, they aren't included - in the Emu48 package. You can still use the classic way extracting - them from your own calculator. But in mostly all cases you have to - convert the ROM files into the Emu48 ROM format.

+ in the Emu48 package. Since accepting packed ROM images, in most cases + converting the given ROM format (which is regulary a packed ROM image) + into the native Emu48 ROM format is not necessary any more. You can + still use the classic way extracting them from your own calculator. +

  • HP38

    To upload the ROM of your HP38G, you will need a special aplet @@ -178,24 +182,24 @@ h3 { color:red; font-size:1.1em; }

    To install Emu48 you may use the installer package which contain, among the binaries, some HP48 KML scripts or just unzip the emulator and the required emulator skins from archives into an empty directory. - Finally you have to copy your ROM images into this directory and - adjust the ROM image name to the name used in the corresponding KML - script. When you first run Emu48, it will detect the directory in - which you installed it, and will write the configuration to the - registry at HKCU\Software\Emu48.

    + Finally copy your ROM images into this directory and adjust the ROM + image name to the name used in the corresponding KML script. When you + first run Emu48, it will detect the directory in which you installed + it, and will write the configuration to the registry at + HKCU\Software\Emu48.

    5. How to Start

    When Emu48 is installed and you have put valid KML scripts and the corresponding ROM image(s) into your Emu48 installation directory, you can start Emu48. You'll see a "Choose Your KML Script" box.

    -

    KML scripts in fact define the visual aspect of Emu48, the behavior of - the buttons, of the keyboard, ... It's a GREAT way to customize your copy - of Emu48.

    -

    Check that the path in the "Emu48 Directory" text area is - correct. Modify it if the directory in which you installed Emu48 is not - the directory displayed. Click the refresh button ("V") after - modifying it to update the list box or use the ("...") button to - start the directory browser.

    +

    KML (Keyboard Mapping Language) scripts define the visual aspect + of Emu48, the behaviour of the buttons, of the keyboard, ... It's a + great way to customize your copy of Emu48.

    +

    Check in this dialog that the path in the "Emu48 Directory" + text area points to the directory in which you installed the Emu48 KML + files. Click the refresh button ("V") after modifying the + directory path manually to update the list box or use the + ("...") button to start a directory browser.

    Choose a KML script in the list box for your calculator ROM you put into Emu48's directory.

    Several HP48 scripts are included in the Emu48 archive:

    @@ -218,19 +222,21 @@ h3 { color:red; font-size:1.1em; }

If you want other great scripts, visit Rechlin's great HP archive

-

And if you are interested in writing new scripts, get the KML 2.0 +

If you are interested in writing new scripts, get the KML 2.0 documentation from the authors Emu48 page.

-

Once you have selected a script, press OK to start the emulator. In - most cases, when Emu48 crash after pressing the OK button, you are using - an invalid ROM image. While it's running, you can use the View/Change KML - Script... command to change the visual aspect of Emu48.

+

Having selected a script, press OK to start the emulator. In most + cases, when Emu48 crash after pressing the OK button, you are using + an invalid ROM image. While it's running, you can use the + "View/Change KML Script..." command to + change the visual aspect of Emu48.

6. Command Line

The command line syntax is "Emu48 [E48file [Port2file]]". - The first parameter sets the filename for the emulation data - independent from the "LastDocument" setting, the second - parameter the Port2 file. You're not able to set a Port 2 file without - setting the emulation data file. The arguments are optional.

+ The first parameter sets the filename of the emulation data + independent from the "LastDocument" setting, normally + reponsible for opening the last used state file. The second parameter + the Port2 file. You're not able to set a Port 2 file without setting + the emulation data file. The arguments are optional.

7. Virtual Keyboard

There are two ways to use the virtual keyboard on the emulated calculator:

@@ -239,38 +245,41 @@ h3 { color:red; font-size:1.1em; }
  • by PC keyboard

    • - The easiest way to use the emulated calculator is using the mouse. The KML - script define buttons with an area where mouse input is active. The mouse - cursor change from an arrow to a hand cursor in these areas. The state of - the virtual key follow the state of your left mouse button. When the mouse - cursor leaves the virtual key area the virtual button automatically - release. In some cases you need to press more than one key on the - emulator. For these cases press the virtual key with the right mouse - button. When you release the mouse button or leave the area of the virtual - key, the key is still hold. To release all hold virtual buttons, just use - the left mouse button again. A single release of a hold virtual key isn't - possible.

    + The easiest way to use the emulated calculator is by using the mouse. The + KML script defines buttons with an area where mouse clicks take effect. + The active area is indicated by changing the cursor from an arrow to a + hand cursor. Pressing the left mouse button over an active area will + press the virtual button. When the mouse cursor leaves the virtual key + area with still the left mouse button pressed, the virtual button is + automatically released. The visual aspect of a pressed or released + virtual button is defined in the KML script. In some cases you need to + press more than one key on the emulator. For these cases press the + virtual key with the right mouse button. When you release the mouse + button or leave the area of the virtual key, the key is still held. + To release all held virtual buttons, just use the left mouse button + again. A single release of a hold virtual key isn't possible.

    Another convenient way is using the PC keyboard. The KML script language - support a large variety of commands to implement this feature. So keyboard - usage depends on your used KML script and not on the emulator. Because of - this it's impossible to say what's happen when you press a key on the PC - keyboard. For further details read the KML 2.0 documentation mentioned - before please.

    + supports a large variety of commands to implement this feature. So + keyboard usage mostly depends on your used KML script and not on the + emulator. Because of this it's impossible to say what's happen when you + press a key on the PC keyboard. Some Windows specific accelerator keys + like F10 cannot be overloaded by the KML script. For further details + read the KML 2.0 documentation mentioned before please.

    8. File Menu

    8.1 New...

    -

    Creates a new emulation session. You're asked for a new KML script - where you can select the calculator type and skin to emulate.

    +

    Creates a new emulation session. You're asked for a KML script where + you can select the calculator type and skin to emulate.

    8.2 Open...

    -

    Opens an existing emulation session. The emulation continues at the - same position where the loaded session was aborted. Loading emulation +

    Opens a previously saved emulation session. The emulation continues + at the same position where the session was aborted. Loading emulation sessions made with a different ROM revision may destroy the memory content or may cause other unpredictable results.

    8.3 Save

    -

    Saves the current running session with the actual name.

    +

    Saves the current session with the actual name.

    8.4 Save As...

    -

    Saves the current running session with a new name. You're also get in - this dialog when you Exit a new session without a state file name.

    +

    Saves the current session with a new name. You're also get this + dialog when you Exit a new session without a state file name.

    8.5 Close

    Closes the current session without closing the emulator.

    8.6 Settings

    @@ -294,10 +303,10 @@ h3 { color:red; font-size:1.1em; } mouse is moved over the emulator window, the emulator is getting the focus and popping up into foreground.

  • Single Instance -

    When this option is checked, the program is only allowed to run in - a single instance. If another running instance is detected, the detected +

    When this option is checked, only one instance of the emulator can + be started. If another running instance is detected, the detected instance is set into foreground as active window and get a request to - change his state file to the given one by the current instance. Finally + change his state file to the given one by the current instance. Then the current instance is terminated.

  • Automatically Save Files

    When this option is checked, the current state file will automatically @@ -305,14 +314,15 @@ h3 { color:red; font-size:1.1em; } emulator program.

  • Automatically Save Files On Exit

    When this option is checked, the current state file will be saved - automatically at the end when the emulator program is closed.

    • + automatically when the emulator program is closed.

  • Show Load Object Warning

    When this option is checked, you'll get a warning message box when you try to load an object with the Load Object... menu command. If this option is unchecked, the warning will be skipped.

  • Always Show KML Compilation Result

    When this option is checked, you see the results of the KML - (Keyboard Macro Language) interpreter at every KML script load.

    • + (Keyboard Mapping Language) interpreter at every KML script load. +

    8.6.1.2 Section Style

      @@ -385,21 +395,24 @@ h3 { color:red; font-size:1.1em; }

    8.6.3 Settings Peripheral

    8.6.3.1 Section Sound

    -

    A new implementation of the sound engine made ROM patches for sound - output obsolete. The new sound engine emulates the behavior of the beeper - output ports and only work in connection with a sound card. Using the - internal PC speaker isn't possible any more. The old beeper method with a - ROM patch is still working but deprecated, it's strongly recommended to - remove all beep patches from your current KML scripts to enable the new - sound engine. The support of the old sound implementation by a ROM patch - maybe removed in later versions of the emulator and remaining beep - patches will corrupt the ROM with an illegal opcode then. +

    A new implementation of the sound engine made ROM patches for sound + output obsolete. The new sound engine emulates the behaviour of the + beeper output ports and only work in connection with a sound card. + Using the legacy PC speaker mode isn't possible any more. The old + beeper method with a ROM patch is still working but deprecated, it's + strongly recommended to remove all beep patches from your current KML + scripts to enable the new sound engine. The support of the old sound + implementation by a ROM patch maybe removed in later versions of the + emulator and remaining beep patches will corrupt the ROM with an + illegal opcode then. Actually the program informs you when + detecting ROM beep patches by opening the "KML Script Compilation + Result" dialog. To prevent this, remove the ROM beep patches + from the KML script.

    -

    - For the sound generation the calculator must know his own CPU strobe +

    For the sound generation the calculator must know his own CPU strobe frequency. On the real calculator the speed depends on various settings like component tolerances, actual temperature, humidity and other - variables. The resulting speed is measured by the calculator firmware + variables. The actual speed is measured by the calculator firmware at a cold- or at a warmstart and stored in the =CSPEED variable. The content of this calculator variable has direct influence on the resulting frequency and duration. On the emulator the HP48SX CPU @@ -414,27 +427,24 @@ h3 { color:red; font-size:1.1em; } frequency registry content has been changed since the last measurement, the =CSPEED variable of this session file may contain a wrong frequency value. You easily may discover this by measuring - the real duration of a 10s beep. Is the difference to 10s less - than 1s everything is ok, if not, you should perform a - warmstart of the calculator in this - session file. Alternatively you may execute a - Reset Calculator. This recalls the measuring - routine and save the result in the speed variable. Both restart - variants purge the stack content! + the real duration of a 10s beep. A deviance less than 1s is ok, + otherwise you should perform a warmstart + of the calculator in this session file. Alternatively you may + execute a Reset Calculator. This recalls the + measuring routine and save the result in the speed variable. Both + restart variants purge the stack content!

    • Volume -

      The output volume can be selected with the Volume slider relative to - the Master Volume control. +

      The output volume can be set with the Volume slider relative to + the Windows Master Volume control.

    • Device -

      By default the sound device is set to "Standard Audio", but - you can also manually choose the output device. The device name is - somehow cut since Window Vista, but the method of reading the device - name is used for backwards compatibility to older versions of the - Operating System. When you change the Standard Audio device in the - Operating System settings dialog, the internal device numbering may - change, and so the manually selected audio device.

      • +

      By default the sound device is set to "Standard Audio", + but you can also manually choose the output device. When you change + the Standard Audio device in the Operating System settings dialog, + the internal device numbering may change, and so the manually selected + audio device.

    8.6.3.2 Section Infrared Printer

    The emulator has the ability to print data to a HP82240A/B printer @@ -475,34 +485,34 @@ h3 { color:red; font-size:1.1em; }

    9.3 Copy Screen

    Copy the screen content as bitmap to the clipboard.

    9.4 Copy Stack

    -

    This is only valid for the HP48SX, HP48GX and the HP49G emulation.

    +

    This menu item is enabled for the HP48SX, HP48GX and the HP49G + emulation.

    Copy a "Real Number", "Complex Number" or "String" object in stack level 1 to the clipboard. On all other objects, the command will be ignored. This prevents sending binary objects to the clipboard.

    The decimal point (radix mark) of "Real Numbers" in the - clipboard is equal to the calculator setting. This point maybe - important when you try to paste the numbers into a program using the - locale settings of the host operating system.

    + clipboard is equal to the calculator setting. This is important when + you try to paste the numbers into a program using the locale settings + of the host operating system.

    9.5 Paste Stack

    -

    This is only valid for the HP48SX, HP48GX and the HP49G emulation.

    +

    This menu item is enabled for the HP48SX, HP48GX and the HP49G + emulation.

    Paste the text field content of the clipboard to stack level 1 of the emulated calculator. If the clipboard content is representing a real number, the number will be saved as "Real Number" object. Is the content a complex number object, the number will be - saved as "Complex Number" object, in all other cases as + saved as "Complex Number" object, otherwise cases as "String" object.

    -

    To import "Real or Complex Numbers" from the clipboard, - the decimal point (radix mark) of the clipboard and calculator - must be equal. A real or complex number is only detected in the - case of valid real number characters in the clipboard. Especially - heading and tailing white spaces aren't valid number characters - also.

    -

    Complex numbers must be in the form (a,b) when using the - point radix mark or in the form (a;b) when using the comma - radix mark. The Cartesian or algebraic form a+bi is not - supported.

    -

    9.6 Reset Calculator

    +

    To import "Real or Complex Numbers" from the clipboard, the + decimal point (radix mark) of the clipboard and calculator must + match. A real or complex number is only detected in the case of valid + real number characters in the clipboard. Especially heading and tailing + white spaces aren't valid number characters also.

    +

    Complex numbers must be in the form (a,b) when using the point + radix mark or in the form (a;b) when using the comma radix mark. + The Cartesian or algebraic form a+bi is not supported.

    +

    9.6 Reset Calculator

    This emulates the Reset pin of the internal CPU.

    9.7 Backup

    9.7.1 Backup Save

    @@ -511,7 +521,7 @@ h3 { color:red; font-size:1.1em; }

    9.7.2 Backup Restore

    This restores a previous saved emulator status without request. If you changed the calculator model meanwhile, the emulator will switch back to - the old model.

    + the model used in the backup.

    9.7.3 Backup Delete

    This deletes the data in the backup slot.

    10. View Menu

    @@ -525,22 +535,22 @@ h3 { color:red; font-size:1.1em; }

    Enter the address to disassemble in hexadecimal into the "Address (HEX)" field and press <Return>. With the "Next Address" button the next opcode is disassembled. With the "Copy Data" button - you can copy all selected lines inside the list box to the clipboard.

    + you can copy all selected lines from the list box to the clipboard.

    11.2 Debugger...

    The assembler code debugger of the emulator. For more details refer to the extra documentation of the debugger please.

    11.3 Macro

    The keyboard macro recorder unit.

    -

    11.3.1 Macro Record...

    +

    11.3.1 Macro Record...

    Prompts a dialog to enter the macro file for the data to record. After accepting the confirm message, every key event is recorded into the macro file with it's time information.

    -

    11.3.2 Macro Play...

    +

    11.3.2 Macro Play...

    Prompts a dialog box to ask for the keyboard macro file to play. The - replay starts immediately after selecting the file.

    -

    11.3.3 Macro Stop

    + replay starts immediately after opening the selected file.

    +

    11.3.3 Macro Stop

    Stops recording or replaying a keyboard macro file.

    -

    11.3.4 Macro Settings...

    +

    11.3.4 Macro Settings...

    Settings for the Macro Replay mode

    • Real @@ -550,9 +560,9 @@ h3 { color:red; font-size:1.1em; }

    12. Help Menu

    12.1 Help Topics

    -

    Call this document.

    +

    Show this document.

    12.2 About Emu48...

    -

    The version, copyright and license message...

    +

    Show the version, copyright and license message...

    13. DDE Server

    Emu48 has an integrated DDE server to transmit data from and to the HP stack. Because only the HP48 and HP49 have a stack, all DDE transfers @@ -591,7 +601,7 @@ h3 { color:red; font-size:1.1em; }

    14. License

    Emu48 - A HP38G/39G/40G/48SX/48GX/49G Emulator
    - Copyright (C) 2018 Christoph Gießelink

    + Copyright (C) 2019 Christoph Gießelink

    This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) diff --git a/Emu48.exe b/Emu48.exe index a619cbfc3374b7537a261585c391db4b2df49308..650adf0824a7f008dfe7b4a19d282ca3a2408ed1 100755 GIT binary patch literal 323584 zcmeFaeSB2awKskyGXn!mI3r9nm7q~ZixMpwuwarpmZ)fBok<|kf`D)7G-{(|ys%w3X4s7?VLZ{Xr}2=tdQRet?}Bj>j-pi zPZ2d3S(RiAP@boH5?7{^L7u_=W@je{!JpnctQxfu{GTDFFv=b%pq6uXFm6dA|3iDV;mRho-bn zSx~MNZ*4C3Oj;FbEmuk}(JDL@GqpQBGpcK}rJfnh6`q3TJ3P*yT6%eKMCld5p&K}f zPUIBFv>Bf14PV}jiLl!ECT5cjU#=-slq$8+iOF)qmn*%9h~yz65>p#<@zlyaz7qRH z>lFz98fn61Zv@Jjs23ltlMr49BBL`rMU{S^KKoRwQa3zW;VJZsApQN*tqQ0cAKvP$ zpQ?alw;EYTF#Q(w{{O;@o+z*=efHaOu23A^_Cth?ztDxndjd+mqC~H;=wHmYC|X_& zQQBDFJJXcPh^tUY_JUFztFMcXY+)7eG{O`(@;J2brcnG;p zN$%BhMMN$mLLY(9{K}cdefnc4x28uv49-TO^TYkN1y$O;N;vjaN&n)jqqfU@`Z5$x 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zl6Lai(CD5N=s7p$izjn;Y!T8-Lz;Kn04=`KiT--T&Oey{b|YnWHH#0TCdTs-OGMH9x49Y4OPsAOz$$uO6{u(EVnVJQ+^FzoWlVQb!EB)nM>!;#7Ov!i!S=e*~^wOfHBK*Cs>H4OEriD#jx7Y3QWY3zuV1ah@ u_\cell\row\trowd\trgaph30\trleft-30\trpaddl30\trpaddr30\trpaddfl3\trpaddfr3 \clbrdrl\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx1986\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx2994\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx4002\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx5010\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx6018\pard\intbl\nowidctlpar\cf1\b0\fs20 1 2048\cell 1 64\cell 1 32\cell 1 1\cell 1 1024\cell\row\pard\nowidctlpar\cf0\f0\fs24\par @@ -746,28 +743,28 @@ Example:\par \clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx851\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx1701\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx2552\clbrdrl\brdrw30\brdrs\clbrdrr\brdrw30\brdrs\clbrdrb\brdrw30\brdrs \cellx3402\pard\intbl\nowidctlpar\cf1\b0\fs20 0 1024\cell 0 2048\cell 0 4096\cell 0 8192\cell\row\pard\nowidctlpar\cf0\b\f0\fs28\par \page Locale\par \b0\fs24\par -\tab With the Locale command you can bind Scancode definitions to a keyboard Input Locale ID. An Input Locale ID, also known a Language Identifier Constant, is a 16 bit decimal number consists of a 10 bit primary language and a 6 bit sublanguage identifier.\par +\tab With the Locale command you can bind Scancode definitions to a keyboard Input Locale ID. An Input Locale ID, also known a Language Identifier Constant, is a 16-bit decimal number consists of a 10-bit primary language and a 6 bit sublanguage identifier.\par \par \f1\fs16 Locale INTEGER\par \tab \par End\par \f0\fs24\par -For example the Primary Language ID for English is 9, the Sublanguage ID for United States (US) is 1 and the Sublanguage ID for United Kingdom (UK) is 2.\par +For example, the Primary Language ID for English is 9, the Sublanguage ID for United States (US) is 1 and the Sublanguage ID for United Kingdom (UK) is 2.\par \par With the formula:\par \par Locale ID = 1024 * Sublanguage ID + Primary Language ID\par \par -Locale ID English(US) = 1024 * 1 + 9 = 1033\par +Locale ID English(US) = 1024 * 1 + 9 = 1033\par Locale ID English(UK) = 1024 * 2 + 9 = 2057\par \par -A special case is the value \ldblquote 0\rdblquote for the Primary Language ID and the Sublanguage ID. \ldblquote 0\rdblquote is standing for Neutral. So if you want to select all English keyboards to one case the Locale ID is\par +A special case is the value \ldblquote 0\rdblquote for the Primary Language ID and the Sublanguage ID. \ldblquote 0\rdblquote is standing for Neutral. So, if you want to select all English keyboards to one case the Locale ID is\par \par -Locale ID English(Neutral) = 1024 * 0 + 9 = 9\par +Locale ID English(Neutral) = 1024 * 0 + 9 = 9\par \par or for selecting all keyboards the Locale ID is\par \par -Locale ID Neutral(Neutral) = 1024 * 0 + 0 = 0\par +Locale ID Neutral(Neutral) = 1024 * 0 + 0 = 0\par \par The interpreter now chooses the first matching Locale in the file and ignoring all following Locale definitions. With this knowledge you can write a decoder selecting a block for English(US), English(UK), English(Neutral) and Default. \par \par @@ -906,8 +903,8 @@ EDIT_BACKUP_RESTORE 15\par EDIT_BACKUP_DELETE 16\par VIEW_SCRIPT 17\par EDIT_PORT_CONFIGURATION 18\par -EDIT_COPY_STRING 19\par -EDIT_PASTE_STRING 20\par +EDIT_COPY_STACK 19\par +EDIT_PASTE_STACK 20\par TOOL_DISASM 21\par TOOL_DEBUG 22\par TOOL_MACRO_RECORD 23\par @@ -926,7 +923,7 @@ Example:\par \pard\nowidctlpar\sa200\sl276\slmult1\f0\fs24\par \pard\nowidctlpar\b\fs28\page Conclusion\par \b0\fs24\par -\pard\nowidctlpar\qj This document was originally written by Casey Patterson for the Keyboard Macro Language made by S\'e9bastien Carlier and is now maintained by Christoph Gie\'dfelink.\par +\pard\nowidctlpar\qj This document was originally written by Casey Patterson for the Keyboard Mapping Language made by S\'e9bastien Carlier and is now maintained by Christoph Gie\'dfelink.\par \pard\nowidctlpar\par I\rquote m sorry, the authors can\rquote t give any individual support, try the forum at http://www.hpmuseum.org/ please.\par \par @@ -937,10 +934,10 @@ The latest updates are available at:\par \pard\nowidctlpar\fi720\b0 c.giesselink@gmx.de\par \pard\nowidctlpar\par \pard\nowidctlpar\fi720 Christoph Giesselink Main Page\par -http://hp.giesselink.com/\par +https://hp.giesselink.com/\par \pard\nowidctlpar\par \par -Release 19: August 15th, 2017\par +Release 21: July 4th, 2019\par \par } \ No newline at end of file diff --git a/PROBLEMS.TXT b/PROBLEMS.TXT index c983cba..2681f65 100644 --- a/PROBLEMS.TXT +++ b/PROBLEMS.TXT @@ -1,4 +1,4 @@ -Known bugs and restrictions of Emu48 V1.61 +Known bugs and restrictions of Emu48 V1.62 ------------------------------------------ - the following I/O bits aren't emulated (incomplete) @@ -47,4 +47,4 @@ Known bugs and restrictions of Emu48 V1.61 - quitting the emulator while programming the flash isn't allowed, because the content of flash state machine isn't saved so far -08/14/18 (c) by Christoph Gießelink, c dot giesselink at gmx dot de +10/15/19 (c) by Christoph Gießelink, c dot giesselink at gmx dot de diff --git a/Sources/Emu48/CHANGES.TXT b/Sources/Emu48/CHANGES.TXT index d444ccd..e19f29a 100644 --- a/Sources/Emu48/CHANGES.TXT +++ b/Sources/Emu48/CHANGES.TXT @@ -1,3 +1,83 @@ +Service Pack 62 for Emu48 Version 1.0 + +DEBUGGER.C +- added enum type, static variables and static function prototypes + for trace implementation +- removed all occurrences of UNREFERENCED_PARAMETER(wParam); +- changed function NotifyDebugger(), added flush trace buffer +- changed function Debugger(), added trace implementation in case + WM_INITDIALOG, WM_DESTROY and WM_COMMAND +- added functions StartTrace(), StopTrace(), FlushTrace(), + PrintTrace(), OutTrace(), OnBrowseTraceSettings(), + TraceSettings(), OnTraceSettings() and OnTraceEnable() for trace + implementation + +DISPLAY.C +- changed function CreateMainBitmap(), changed LoadBitmapFile() + function call loading a bitmap with realizing a palette +- changed function CreateAnnunBitmap(), changed LoadBitmapFile() + function call loading a bitmap without realizing a palette + +EMU48.C +- added variable bMouseButton saving if mouse button was pressed + when mouse cursor was inside a virtual button hit area +- removed function OnNcHitTest(), replaced by additional + OnLButtonDown() implementation +- changed function OnLButtonDown(), added part for windows movement + when having no title bar prior done over the WM_NCHITTEST message + handler which caused side effects +- changed function OnLButtonUp() and OnKeyDown(), added reset of + variable bMouseButton +- changed function MainWndProc(), added WM_ENDSESSION handler for + document saving, WM_CONTEXTMENU calls the context menu only when + the right mouse button was not pressed over a virtual button hit + area before, removed the WM_NCRBUTTONUP case and removed the + WM_NCHITTEST message handler + +EMU48.DSP +- added "LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS" to lodepng.c + definitions + +EMU48.H +- changed function prototype +- extern declaration of global functions + +EMU48.RC +- added dialog IDD_TRACE +- changed menu IDR_DEBUG, added ID_TRACE_SETTINGS and + ID_TRACE_ENABLE menu items +- changed version and copyright + +ENGINE.C +- changed function Debugger(), added function fnOutTrace() call + +FILES.C +- added function CheckForBeepPatch() looking for ROM beep patches at + known positions +- bugfix in function NewDocument(), initialize the ROM fingerprint + after loading the KML script +- changed function DecodeBmp(), DecodeGif(), DecodePng() and + LoadBitmapFile(), changed function prototype by adding an argument + if a palette should realized + +KML.C +- bugfix in function ParseLines() and ParseBlocks(), if loading of + an include file failed the KML script line number at the error + message was wrong +- changed function InitKML(), added error check ROM beep patches + +LODEPNG.C +- changed implementation file to LodePNG version 20190914 with + unmarked typecast patches for x64 compatibility, Copyright (c) + 2005-2019 Lode Vandevenne + +LODEPNG.H +- changed header file to LodePNG version 20190914 + +RESOURCE.H +- added definitions + + Service Pack 61 for Emu48 Version 1.0 EMU48.DSP diff --git a/Sources/Emu48/DEBUGGER.C b/Sources/Emu48/DEBUGGER.C index 0cab4aa..80eb4fd 100644 --- a/Sources/Emu48/DEBUGGER.C +++ b/Sources/Emu48/DEBUGGER.C @@ -35,6 +35,9 @@ #define CODELABEL 0x80000000 // label in code window +// trace log file modes +enum TRACE_MODE { TRACE_FILE_NEW = 0, TRACE_FILE_APPEND }; + typedef struct CToolBarData { WORD wVersion; @@ -81,6 +84,14 @@ static DWORD dwAdrMemFol = 0; // follow address memory window static UINT uIDMap = ID_DEBUG_MEM_MAP; // current memory view mode +static BOOL bDbgTrace = FALSE; // enable trace output +static HANDLE hLogFile = NULL; // log file handle +static TCHAR szTraceFilename[MAX_PATH] = _T("trace.log"); // filename for trace file +static UINT uTraceMode = TRACE_FILE_NEW; // trace log file mode +static BOOL bTraceReg = TRUE; // enable register logging +static BOOL bTraceMmu = FALSE; // disable MMU logging +static BOOL bTraceOpc = TRUE; // enable opcode logging + static LONG lCharWidth; // width of a character (is a fix font) static HMENU hMenuCode,hMenuMem,hMenuStack;// handle of context menues @@ -108,6 +119,12 @@ static BOOL OnInfoWoRegister(HWND hDlg); static VOID UpdateProfileWnd(HWND hDlg); static BOOL OnMemLoadData(HWND hDlg); static BOOL OnMemSaveData(HWND hDlg); +static VOID StartTrace(VOID); +static VOID StopTrace(VOID); +static VOID FlushTrace(VOID); +static VOID OutTrace(VOID); +static BOOL OnTraceSettings(HWND hDlg); +static BOOL OnTraceEnable(HWND hDlg); //################ //# @@ -1768,6 +1785,7 @@ BOOL CheckBreakpoint(DWORD dwAddr, DWORD dwRange, UINT nType) VOID NotifyDebugger(INT nType) // update registers { nRplBreak = nType; // save breakpoint type + FlushTrace(); // flush trace buffer _ASSERT(hDlgDebug); // debug dialog box open PostMessage(hDlgDebug,WM_UPDATE,0,0); return; @@ -1861,6 +1879,7 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM HDC hDC; HFONT hFont; HMENU hSysMenu; + HMENU hDbgMenu; INT i; switch (message) @@ -1870,6 +1889,15 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM if (bAlwaysOnTop) SetWindowPos(hDlg,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE | SWP_NOSIZE); SendMessage(hDlg,WM_SETICON,ICON_BIG,(LPARAM) LoadIcon(hApp,MAKEINTRESOURCE(IDI_EMU48))); + bDbgTrace = FALSE; // disable file trace + + // load file trace settings + ReadSettingsString(_T("Debugger"),_T("TraceFile"),szTraceFilename,szTraceFilename,ARRAYSIZEOF(szTraceFilename)); + uTraceMode = ReadSettingsInt(_T("Debugger"),_T("TraceFileMode"),uTraceMode); + bTraceReg = ReadSettingsInt(_T("Debugger"),_T("TraceRegister"),bTraceReg); + bTraceMmu = ReadSettingsInt(_T("Debugger"),_T("TraceMMU"),bTraceMmu); + bTraceOpc = ReadSettingsInt(_T("Debugger"),_T("TraceOpcode"),bTraceOpc); + // add Settings item to sysmenu _ASSERT((IDM_DEBUG_SETTINGS & 0xFFF0) == IDM_DEBUG_SETTINGS); _ASSERT(IDM_DEBUG_SETTINGS < 0xF000); @@ -1879,11 +1907,17 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM VERIFY(AppendMenu(hSysMenu,MF_STRING,IDM_DEBUG_SETTINGS,_T("Debugger Settings..."))); } + hDbgMenu = GetMenu(hDlg); // menu of debugger dialog hWndToolbar = CreateToolbar(hDlg); // add toolbar - CheckMenuItem(GetMenu(hDlg),ID_BREAKPOINTS_NOP3, bDbgNOP3 ? MF_CHECKED : MF_UNCHECKED); - CheckMenuItem(GetMenu(hDlg),ID_BREAKPOINTS_DOCODE,bDbgCode ? MF_CHECKED : MF_UNCHECKED); - CheckMenuItem(GetMenu(hDlg),ID_BREAKPOINTS_RPL, bDbgRPL ? MF_CHECKED : MF_UNCHECKED); - CheckMenuItem(GetMenu(hDlg),ID_INTR_STEPOVERINT, bDbgSkipInt ? MF_CHECKED : MF_UNCHECKED); + + CheckMenuItem(hDbgMenu,ID_BREAKPOINTS_NOP3, bDbgNOP3 ? MF_CHECKED : MF_UNCHECKED); + CheckMenuItem(hDbgMenu,ID_BREAKPOINTS_DOCODE,bDbgCode ? MF_CHECKED : MF_UNCHECKED); + CheckMenuItem(hDbgMenu,ID_BREAKPOINTS_RPL, bDbgRPL ? MF_CHECKED : MF_UNCHECKED); + CheckMenuItem(hDbgMenu,ID_INTR_STEPOVERINT, bDbgSkipInt ? MF_CHECKED : MF_UNCHECKED); + CheckMenuItem(hDbgMenu,ID_TRACE_ENABLE, bDbgTrace ? MF_CHECKED : MF_UNCHECKED); + + EnableMenuItem(hDbgMenu,ID_TRACE_SETTINGS,bDbgTrace ? MF_GRAYED : MF_ENABLED); + hDlgDebug = hDlg; // handle for debugger dialog hEventDebug = CreateEvent(NULL,FALSE,FALSE,NULL); if (hEventDebug == NULL) @@ -1931,6 +1965,7 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM InitBsArea(hDlg); // init bank switcher list box DisableMenuKeys(hDlg); // set debug menu keys into run state + fnOutTrace = OutTrace; // function for file trace RplReadNibble = GetMemNib; // get nibble function for RPL object viewer dwDbgStopPC = -1; // no stop address for goto cursor @@ -1949,6 +1984,7 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM case WM_DESTROY: // SetHP48Time(); // update time & date nDbgState = DBG_OFF; // debugger inactive + StopTrace(); // finish trace bInterrupt = TRUE; // exit opcode loop SetEvent(hEventDebug); if (pdwInstrArray) // free last instruction circular buffer @@ -1965,6 +2001,14 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM GetWindowPlacement(hDlg, &wndpl); nDbgPosX = wndpl.rcNormalPosition.left; nDbgPosY = wndpl.rcNormalPosition.top; + + // save file trace settings + WriteSettingsString(_T("Debugger"),_T("TraceFile"),szTraceFilename); + WriteSettingsInt(_T("Debugger"),_T("TraceFileMode"),uTraceMode); + WriteSettingsInt(_T("Debugger"),_T("TraceRegister"),bTraceReg); + WriteSettingsInt(_T("Debugger"),_T("TraceMMU"),bTraceMmu); + WriteSettingsInt(_T("Debugger"),_T("TraceOpcode"),bTraceOpc); + RplDeleteTable(); // delete rpl symbol table DeleteObject(hFontBold); // delete bold font DestroyMenu(hMenuMainCode); @@ -2023,6 +2067,8 @@ static INT_PTR CALLBACK Debugger(HWND hDlg, UINT message, WPARAM wParam, LPARAM case ID_BREAKPOINTS_NOP3: return OnToggleMenuItem(hDlg,LOWORD(wParam),&bDbgNOP3); case ID_BREAKPOINTS_DOCODE: return OnToggleMenuItem(hDlg,LOWORD(wParam),&bDbgCode); case ID_BREAKPOINTS_RPL: return OnToggleMenuItem(hDlg,LOWORD(wParam),&bDbgRPL); + case ID_TRACE_SETTINGS: return OnTraceSettings(hDlg); + case ID_TRACE_ENABLE: return OnTraceEnable(hDlg); case ID_INFO_LASTINSTRUCTIONS: return OnInfoIntr(hDlg); case ID_INFO_PROFILE: return OnProfile(hDlg); case ID_INFO_WRITEONLYREG: return OnInfoWoRegister(hDlg); @@ -2199,7 +2245,7 @@ static __inline BOOL OnFindOK(HWND hDlg,BOOL bASCII,DWORD *pdwAddrLast,INT nSear #if defined _UNICODE { // Unicode to byte translation - LPTSTR szTmp = DuplicateString((LPTSTR) lpbySearch); + LPTSTR szTmp = DuplicateString((LPCTSTR) lpbySearch); if (szTmp != NULL) { WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, @@ -2711,7 +2757,6 @@ static INT_PTR CALLBACK Settings(HWND hDlg, UINT message, WPARAM wParam, LPARAM } } return FALSE; - UNREFERENCED_PARAMETER(wParam); UNREFERENCED_PARAMETER(lParam); } @@ -2775,7 +2820,6 @@ static INT_PTR CALLBACK NewValue(HWND hDlg, UINT message, WPARAM wParam, LPARAM } } return FALSE; - UNREFERENCED_PARAMETER(wParam); } static INT_PTR OnNewValue(LPTSTR lpszValue) @@ -2827,7 +2871,6 @@ static INT_PTR CALLBACK EnterAddr(HWND hDlg, UINT message, WPARAM wParam, LPARAM } } return FALSE; - UNREFERENCED_PARAMETER(wParam); } static VOID OnEnterAddress(HWND hDlg, DWORD *dwValue) @@ -2880,7 +2923,6 @@ static INT_PTR CALLBACK EnterBreakpoint(HWND hDlg, UINT message, WPARAM wParam, } } return FALSE; - UNREFERENCED_PARAMETER(wParam); } static VOID OnEnterBreakpoint(HWND hDlg, BP_T *sValue) @@ -3175,7 +3217,6 @@ static INT_PTR CALLBACK EditBreakpoint(HWND hDlg, UINT message, WPARAM wParam, L return TRUE; } return FALSE; - UNREFERENCED_PARAMETER(wParam); UNREFERENCED_PARAMETER(lParam); } @@ -3561,7 +3602,6 @@ static INT_PTR CALLBACK DebugMemLoad(HWND hDlg, UINT message, WPARAM wParam, LPA } } return FALSE; - UNREFERENCED_PARAMETER(wParam); UNREFERENCED_PARAMETER(lParam); } @@ -3569,7 +3609,6 @@ static BOOL OnMemLoadData(HWND hDlg) { if (DialogBox(hApp, MAKEINTRESOURCE(IDD_DEBUG_MEMLOAD), hDlg, (DLGPROC)DebugMemLoad) == -1) AbortMessage(_T("DebugLoad Dialog Box Creation Error !")); - return -1; } @@ -3617,7 +3656,6 @@ static INT_PTR CALLBACK DebugMemSave(HWND hDlg, UINT message, WPARAM wParam, LPA } } return FALSE; - UNREFERENCED_PARAMETER(wParam); UNREFERENCED_PARAMETER(lParam); } @@ -3625,6 +3663,337 @@ static BOOL OnMemSaveData(HWND hDlg) { if (DialogBox(hApp, MAKEINTRESOURCE(IDD_DEBUG_MEMSAVE), hDlg, (DLGPROC)DebugMemSave) == -1) AbortMessage(_T("DebugSave Dialog Box Creation Error !")); - return -1; } + + +//################ +//# +//# Trace Log +//# +//################ + +static VOID StartTrace(VOID) +{ + if (hLogFile == NULL) + { + SetCurrentDirectory(szEmuDirectory); + hLogFile = CreateFile( + szTraceFilename, + GENERIC_READ|GENERIC_WRITE, + FILE_SHARE_READ, + NULL, + (uTraceMode == TRACE_FILE_NEW) ? CREATE_ALWAYS : OPEN_ALWAYS, + 0, + NULL); + SetCurrentDirectory(szCurrentDirectory); + if (hLogFile == INVALID_HANDLE_VALUE) + { + InfoMessage(_T("Unable to create trace log file.")); + hLogFile = NULL; + return; + } + + // goto end of file + SetFilePointer(hLogFile,0L,NULL,FILE_END); + } + return; +} + +static VOID StopTrace(VOID) +{ + if (hLogFile != NULL) + { + CloseHandle(hLogFile); + } + hLogFile = NULL; + return; +} + +static VOID FlushTrace(VOID) +{ + if (hLogFile != NULL) + { + VERIFY(FlushFileBuffers(hLogFile)); + } + return; +} + +static __inline void __cdecl PrintTrace(LPCTSTR lpFormat, ...) +{ + TCHAR cOutput[1024]; + DWORD dwWritten, dwRead; + va_list arglist; + + va_start(arglist,lpFormat); + dwWritten = (DWORD) wvsprintf(cOutput,lpFormat,arglist); + va_end(arglist); + #if defined _UNICODE + { + // Unicode to byte translation + LPTSTR szTmp = DuplicateString(cOutput); + if (szTmp != NULL) + { + WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, + szTmp, -1, + (LPSTR) cOutput, sizeof(cOutput), NULL, NULL); + free(szTmp); + } + } + #endif + WriteFile(hLogFile,cOutput,dwWritten,&dwRead,NULL); + return; +} + +static VOID OutTrace(VOID) +{ + enum MEM_MAPPING eMapMode; + LPCTSTR lpszName; + LPTSTR s,d; + TCHAR szBuffer[128]; + TCHAR szOpc[8]; + DWORD dwNxtAddr,dwOpcAddr; + UINT i; + + if (hLogFile != NULL) // log file opened + { + if (bTraceReg) // show regs + { + INT nPos; + + nPos = wsprintf(szBuffer,_T("\r\n A=%s"),RegToStr(Chipset.A,16)); + nPos += wsprintf(&szBuffer[nPos],_T(" B=%s"),RegToStr(Chipset.B,16)); + nPos += wsprintf(&szBuffer[nPos],_T(" C=%s"),RegToStr(Chipset.C,16)); + wsprintf(&szBuffer[nPos],_T(" D=%s\r\n"),RegToStr(Chipset.D,16)); + PrintTrace(szBuffer); + + nPos = wsprintf(szBuffer,_T(" R0=%s"),RegToStr(Chipset.R0,16)); + nPos += wsprintf(&szBuffer[nPos],_T(" R1=%s"),RegToStr(Chipset.R1,16)); + nPos += wsprintf(&szBuffer[nPos],_T(" R2=%s"),RegToStr(Chipset.R2,16)); + wsprintf(&szBuffer[nPos],_T(" R3=%s\r\n"),RegToStr(Chipset.R3,16)); + PrintTrace(szBuffer); + + PrintTrace(_T(" R4=%s D0=%05X D1=%05X P=%X CY=%d Mode=%c OUT=%03X IN=%04X\r\n"), + RegToStr(Chipset.R4,16),Chipset.d0,Chipset.d1,Chipset.P,Chipset.carry, + Chipset.mode_dec ? _T('D') : _T('H'),Chipset.out,Chipset.in); + + PrintTrace(_T(" ST=%s MP=%d SR=%d SB=%d XM=%d IntrEn=%d KeyScan=%d BS=%02X\r\n"), + RegToStr(Chipset.ST,4), + (Chipset.HST & MP) != 0,(Chipset.HST & SR) != 0,(Chipset.HST & SB) != 0,(Chipset.HST & XM) != 0, + Chipset.inte,Chipset.intk,Chipset.Bank_FF & 0x7F); + + // hardware stack content + PrintTrace(_T(" Stack=")); + for (i = 1; i <= ARRAYSIZEOF(Chipset.rstk); ++i) + { + PrintTrace(_T(" %05X"), Chipset.rstk[(Chipset.rstkp-i)&7]); + } + PrintTrace(_T("\r\n")); + } + + if (bTraceMmu) // show MMU + { + TCHAR szSize[8],szAddr[8]; + + if (!bTraceReg) // no regs + { + PrintTrace(_T("\r\n")); // add separator line + } + + wsprintf(szAddr, Chipset.IOCfig ? _T("%05X") : _T("-----"),Chipset.IOBase); + PrintTrace(_T(" I/O=%s"),szAddr); + + wsprintf(szSize, Chipset.P0Cfg2 ? _T("%05X") : _T("-----"),(Chipset.P0Size^0xFF)<<12); + wsprintf(szAddr, Chipset.P0Cfig ? _T("%05X") : _T("-----"),Chipset.P0Base<<12); + PrintTrace(_T(" NCE2=%s/%s"),szSize,szAddr); + + if (cCurrentRomType=='S') + { + wsprintf(szSize, Chipset.P1Cfg2 ? _T("%05X") : _T("-----"),(Chipset.P1Size^0xFF)<<12); + wsprintf(szAddr, Chipset.P1Cfig ? _T("%05X") : _T("-----"),Chipset.P1Base<<12); + } + else + { + wsprintf(szSize, Chipset.BSCfg2 ? _T("%05X") : _T("-----"),(Chipset.BSSize^0xFF)<<12); + wsprintf(szAddr, Chipset.BSCfig ? _T("%05X") : _T("-----"),Chipset.BSBase<<12); + } + PrintTrace(_T(" CE1=%s/%s"),szSize,szAddr); + + if (cCurrentRomType=='S') + { + wsprintf(szSize, Chipset.P2Cfg2 ? _T("%05X") : _T("-----"),(Chipset.P2Size^0xFF)<<12); + wsprintf(szAddr, Chipset.P2Cfig ? _T("%05X") : _T("-----"),Chipset.P2Base<<12); + } + else + { + wsprintf(szSize, Chipset.P1Cfg2 ? _T("%05X") : _T("-----"),(Chipset.P1Size^0xFF)<<12); + wsprintf(szAddr, Chipset.P1Cfig ? _T("%05X") : _T("-----"),Chipset.P1Base<<12); + } + PrintTrace(_T(" CE2=%s/%s"),szSize,szAddr); + + if (cCurrentRomType=='S') + { + wsprintf(szSize, Chipset.BSCfg2 ? _T("%05X") : _T("-----"),(Chipset.BSSize^0xFF)<<12); + wsprintf(szAddr, Chipset.BSCfig ? _T("%05X") : _T("-----"),Chipset.BSBase<<12); + } + else + { + wsprintf(szSize, Chipset.P2Cfg2 ? _T("%05X") : _T("-----"),(Chipset.P2Size^0xFF)<<12); + wsprintf(szAddr, Chipset.P2Cfig ? _T("%05X") : _T("-----"),Chipset.P2Base<<12); + } + PrintTrace(_T(" NCE3=%s/%s\r\n"),szSize,szAddr); + } + + // disassemble line + eMapMode = GetMemMapType(); // get current map mode + SetMemMapType(MEM_MMU); // disassemble in mapped mode + + // entry has a name + if (disassembler_symb && (lpszName = RplGetName(Chipset.pc)) != NULL) + { + PrintTrace(_T("=%s\r\n"),lpszName); // print address as label + } + dwNxtAddr = disassemble(Chipset.pc,szBuffer); + + // in disassembly replace space characters + // between Opcode and Modifier with one TAB + if ((s = _tcschr(szBuffer,_T(' '))) != NULL) + { + // skip blanks + for (d = s; *d == _T(' '); ++d) { } + + if (d == &szBuffer[8]) // on TAB position + { + *s++ = _T('\t'); // replace with TAB + + // move the opcode modifier + while ((*s++ = *d++) != 0) { } + } + } + + if (bTraceOpc) // show opcode nibbles + { + dwOpcAddr = Chipset.pc; // init address + + // show opcode nibbles in a block of 5 + for (i = 0; i < 5 && dwOpcAddr < dwNxtAddr; ++i) + { + szOpc[i] = cHex[GetMemNib(&dwOpcAddr)]; + } + + if (i == 1) // only 1 nibble written + { + szOpc[i++] = _T('\t'); // one additional TAB necessary + } + szOpc[i] = 0; // EOS + + PrintTrace(_T("%05lX %s\t%s\r\n"),Chipset.pc,szOpc,szBuffer); + + while (dwOpcAddr < dwNxtAddr) // decode rest of opcode + { + // show opcode nibbles in a block of 5 + for (i = 0; i < 5 && dwOpcAddr < dwNxtAddr; ++i) + { + szOpc[i] = cHex[GetMemNib(&dwOpcAddr)]; + } + szOpc[i] = 0; // EOS + + PrintTrace(_T(" %s\r\n"),szOpc); + } + } + else // without opcode nibbles + { + PrintTrace(_T("%05lX\t%s\r\n"),Chipset.pc,szBuffer); + } + + SetMemMapType(eMapMode); // switch back to old map mode + } + return; +} + +// +// trace settings dialog +// +static BOOL OnBrowseTraceSettings(HWND hDlg) +{ + TCHAR szBuffer[MAX_PATH]; + OPENFILENAME ofn; + + // get current content of file edit box + GetDlgItemText(hDlg,IDC_TRACE_FILE,szBuffer,ARRAYSIZEOF(szBuffer)); + + ZeroMemory(&ofn, sizeof(OPENFILENAME)); + ofn.lStructSize = sizeof(OPENFILENAME); + ofn.hwndOwner = hDlg; + ofn.lpstrFilter = + _T("Trace Log Files (*.log)\0*.log\0") + _T("All Files (*.*)\0*.*\0"); + ofn.lpstrDefExt = _T("log"); + ofn.nFilterIndex = 1; + ofn.lpstrFile = szBuffer; + ofn.nMaxFile = ARRAYSIZEOF(szBuffer); + ofn.Flags = OFN_EXPLORER|OFN_HIDEREADONLY|OFN_CREATEPROMPT|OFN_OVERWRITEPROMPT; + if (GetSaveFileName(&ofn)) + { + SetDlgItemText(hDlg,IDC_TRACE_FILE,szBuffer); + } + return 0; +} + +// +// trace settings +// +static INT_PTR CALLBACK TraceSettings(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) +{ + switch (message) + { + case WM_INITDIALOG: + SetDlgItemText(hDlg,IDC_TRACE_FILE,szTraceFilename); + CheckDlgButton(hDlg,(uTraceMode == TRACE_FILE_NEW) ? IDC_TRACE_NEW : IDC_TRACE_APPEND,BST_CHECKED); + CheckDlgButton(hDlg,IDC_TRACE_REGISTER,bTraceReg); + CheckDlgButton(hDlg,IDC_TRACE_MMU,bTraceMmu); + CheckDlgButton(hDlg,IDC_TRACE_OPCODE,bTraceOpc); + return TRUE; + + case WM_COMMAND: + switch(LOWORD(wParam)) + { + case IDC_TRACE_BROWSE: + return OnBrowseTraceSettings(hDlg); + + case IDOK: + // get filename + GetDlgItemText(hDlg,IDC_TRACE_FILE,szTraceFilename,ARRAYSIZEOF(szTraceFilename)); + + // trace mode + uTraceMode = IsDlgButtonChecked(hDlg,IDC_TRACE_NEW) ? TRACE_FILE_NEW : TRACE_FILE_APPEND; + + // trace content + bTraceReg = IsDlgButtonChecked(hDlg,IDC_TRACE_REGISTER); + bTraceMmu = IsDlgButtonChecked(hDlg,IDC_TRACE_MMU); + bTraceOpc = IsDlgButtonChecked(hDlg,IDC_TRACE_OPCODE); + + // no break + case IDCANCEL: + EndDialog(hDlg,LOWORD(wParam)); + return TRUE; + } + } + return FALSE; + UNREFERENCED_PARAMETER(lParam); +} + +static BOOL OnTraceSettings(HWND hDlg) +{ + if (DialogBox(hApp, MAKEINTRESOURCE(IDD_TRACE), hDlg, (DLGPROC)TraceSettings) == -1) + AbortMessage(_T("TraceSettings Dialog Box Creation Error !")); + return -1; +} + +static BOOL OnTraceEnable(HWND hDlg) +{ + OnToggleMenuItem(hDlg,ID_TRACE_ENABLE,&bDbgTrace); + bDbgTrace ? StartTrace() : StopTrace(); + EnableMenuItem(GetMenu(hDlg),ID_TRACE_SETTINGS,bDbgTrace ? MF_GRAYED : MF_ENABLED); + return 0; +} diff --git a/Sources/Emu48/DISPLAY.C b/Sources/Emu48/DISPLAY.C index a90ef1d..60deda7 100644 --- a/Sources/Emu48/DISPLAY.C +++ b/Sources/Emu48/DISPLAY.C @@ -241,7 +241,7 @@ BOOL CreateMainBitmap(LPCTSTR szFilename) _ASSERT(hWindowDC != NULL); VERIFY(hMainDC = CreateCompatibleDC(hWindowDC)); if (hMainDC == NULL) return FALSE; // quit if failed - hMainBitmap = LoadBitmapFile(szFilename); + hMainBitmap = LoadBitmapFile(szFilename,TRUE); if (hMainBitmap == NULL) { DeleteDC(hMainDC); @@ -276,7 +276,7 @@ BOOL CreateAnnunBitmap(LPCTSTR szFilename) _ASSERT(hWindowDC != NULL); VERIFY(hAnnunDC = CreateCompatibleDC(hWindowDC)); if (hAnnunDC == NULL) return FALSE; // quit if failed - hAnnunBitmap = LoadBitmapFile(szFilename); + hAnnunBitmap = LoadBitmapFile(szFilename,FALSE); if (hAnnunBitmap == NULL) { DeleteDC(hAnnunDC); diff --git a/Sources/Emu48/EMU48.C b/Sources/Emu48/EMU48.C index 4e55e68..e5a7297 100644 --- a/Sources/Emu48/EMU48.C +++ b/Sources/Emu48/EMU48.C @@ -13,7 +13,7 @@ #include "kml.h" #include "debugger.h" -#define VERSION "1.61" +#define VERSION "1.62" #ifdef _DEBUG LPCTSTR szNoTitle = _T("Emu48 ")_T(VERSION)_T(" Debug"); @@ -41,6 +41,7 @@ static const LPCTSTR szLicence = static BOOL bOwnCursor = FALSE; static BOOL bTitleBar = TRUE; +static BOOL bMouseButton = FALSE; CRITICAL_SECTION csGDILock; // critical section for hWindowDC @@ -1776,28 +1777,19 @@ static VOID OnContextMenu(LPARAM lParam) return; } -static BOOL OnNcHitTest(LPARAM lParam) -{ - if (!bTitleBar || bClientWinMove) // no title bar or window movement over client enabled - { - POINT pt; - - POINTSTOPOINT(pt,MAKEPOINTS(lParam)); // mouse position - VERIFY(ScreenToClient(hWnd,&pt)); // convert mouse into client position - - if (pt.y >= 0) // client area - { - // hit area not over a button - return !MouseIsButton(pt.x,pt.y); - } - } - return FALSE; -} - static LRESULT OnLButtonDown(UINT nFlags, WORD x, WORD y) { if (nMacroState == MACRO_PLAY) return 0; // playing macro if (nState == SM_RUN) MouseButtonDownAt(nFlags, x,y); + + bMouseButton = MouseIsButton(x,y); // mouse is over button hit area + + // no title bar or window movement over client enabled and hit area not over a button + if ((!bTitleBar || bClientWinMove) && nFlags == MK_LBUTTON && !bMouseButton) + { + // move window while holding the left mouse button + PostMessage(hWnd,WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(x,y)); + } return 0; } @@ -1805,6 +1797,7 @@ static LRESULT OnLButtonUp(UINT nFlags, WORD x, WORD y) { if (nMacroState == MACRO_PLAY) return 0; // playing macro if (nState == SM_RUN) MouseButtonUpAt(nFlags, x,y); + bMouseButton = FALSE; return 0; } @@ -1840,6 +1833,7 @@ static LRESULT OnKeyDown(int nVirtKey, LPARAM lKeyData) // call RunKey() only once (suppress autorepeat feature) if (nState == SM_RUN && (lKeyData & 0x40000000) == 0) RunKey((BYTE)nVirtKey, TRUE); + bMouseButton = FALSE; return 0; } @@ -1983,12 +1977,18 @@ LRESULT CALLBACK MainWndProc(HWND hWindow, UINT uMsg, WPARAM wParam, LPARAM lPar case SC_CLOSE: return OnFileExit(); } break; - case WM_CONTEXTMENU: - case WM_NCRBUTTONUP: - OnContextMenu(lParam); + case WM_ENDSESSION: + // session will end and any auto saving is enabled + if (wParam == TRUE && (bAutoSave || bAutoSaveOnExit)) + { + SwitchToState(SM_INVALID); // hold emulation thread + if (szCurrentFilename[0] != 0) // has current filename + SaveDocument(); + SwitchToState(SM_RUN); // on cancel restart emulation thread + } break; - case WM_NCHITTEST: - if (OnNcHitTest(lParam)) return HTCAPTION; + case WM_CONTEXTMENU: + if (!bMouseButton) OnContextMenu(lParam); break; case WM_RBUTTONDOWN: case WM_LBUTTONDOWN: return OnLButtonDown((UINT) wParam, LOWORD(lParam), HIWORD(lParam)); diff --git a/Sources/Emu48/EMU48.DSP b/Sources/Emu48/EMU48.DSP index ebcbe30..cc18faf 100644 --- a/Sources/Emu48/EMU48.DSP +++ b/Sources/Emu48/EMU48.DSP @@ -220,7 +220,7 @@ SOURCE=.\kml.c # Begin Source File SOURCE=.\lodepng.c -# ADD CPP /D "LODEPNG_NO_COMPILE_ENCODER" /D "LODEPNG_NO_COMPILE_DISK" /D "LODEPNG_NO_COMPILE_ERROR_TEXT" /D "LODEPNG_NO_COMPILE_CPP" +# ADD CPP /D "LODEPNG_NO_COMPILE_ENCODER" /D "LODEPNG_NO_COMPILE_DISK" /D "LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS" /D "LODEPNG_NO_COMPILE_ERROR_TEXT" /D "LODEPNG_NO_COMPILE_CPP" # SUBTRACT CPP /YX /Yc /Yu # End Source File # Begin Source File diff --git a/Sources/Emu48/EMU48.H b/Sources/Emu48/EMU48.H index a9336b5..de08e45 100644 --- a/Sources/Emu48/EMU48.H +++ b/Sources/Emu48/EMU48.H @@ -215,6 +215,7 @@ extern DWORD *pdwInstrArray; extern WORD wInstrSize; extern WORD wInstrWp; extern WORD wInstrRp; +extern VOID (*fnOutTrace)(VOID); extern VOID SuspendDebugger(VOID); extern VOID ResumeDebugger(VOID); extern VOID CheckSerial(VOID); @@ -260,6 +261,7 @@ extern BOOL bBackup; extern VOID SetWindowLocation(HWND hWnd,INT nPosX,INT nPosY); extern DWORD GetCutPathName(LPCTSTR szFileName,LPTSTR szBuffer,DWORD dwBufferLength,INT nCutLength); extern VOID SetWindowPathTitle(LPCTSTR szFileName); +extern BOOL CheckForBeepPatch(VOID); extern VOID UpdatePatches(BOOL bPatch); extern BOOL PatchRom(LPCTSTR szFilename); extern BOOL CrcRom(WORD *pwChk); @@ -285,7 +287,7 @@ extern BOOL LoadObject(LPCTSTR szFilename); extern BOOL SaveObject(LPCTSTR szFilename); extern BOOL LoadIconFromFile(LPCTSTR szFilename); extern VOID LoadIconDefault(VOID); -extern HBITMAP LoadBitmapFile(LPCTSTR szFilename); +extern HBITMAP LoadBitmapFile(LPCTSTR szFilename,BOOL bPalette); extern HRGN CreateRgnFromBitmap(HBITMAP hBmp,COLORREF color,DWORD dwTol); // Timer.c diff --git a/Sources/Emu48/EMU48.RC b/Sources/Emu48/EMU48.RC index c1de11b..15fee68 100644 --- a/Sources/Emu48/EMU48.RC +++ b/Sources/Emu48/EMU48.RC @@ -206,6 +206,14 @@ BEGIN TOPMARGIN, 7 BOTTOMMARGIN, 109 END + + IDD_TRACE, DIALOG + BEGIN + LEFTMARGIN, 7 + RIGHTMARGIN, 240 + TOPMARGIN, 7 + BOTTOMMARGIN, 106 + END END #endif // APSTUDIO_INVOKED @@ -295,7 +303,7 @@ FONT 8, "MS Sans Serif" BEGIN ICON IDI_EMU48,IDC_STATIC,7,6,20,20,SS_REALSIZEIMAGE LTEXT "",IDC_VERSION,29,6,151,8,NOT WS_GROUP - LTEXT "Copyright © 2018 Christoph Gießelink && Sébastien Carlier", + LTEXT "Copyright © 2019 Christoph Gießelink && Sébastien Carlier", IDC_STATIC,29,18,181,8 DEFPUSHBUTTON "OK",IDOK,215,12,39,14 EDITTEXT IDC_LICENSE,7,33,247,112,ES_MULTILINE | ES_AUTOHSCROLL | @@ -654,6 +662,30 @@ BEGIN PUSHBUTTON "Cancel",IDCANCEL,122,95,50,14 END +IDD_TRACE DIALOG DISCARDABLE 0, 0, 247, 113 +STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU +CAPTION "Trace Settings" +FONT 8, "MS Sans Serif" +BEGIN + LTEXT "Log File:",IDC_STATIC,7,13,28,8 + EDITTEXT IDC_TRACE_FILE,39,11,180,12,ES_AUTOHSCROLL + PUSHBUTTON "...",IDC_TRACE_BROWSE,220,11,20,12 + CONTROL "&New",IDC_TRACE_NEW,"Button",BS_AUTORADIOBUTTON | + WS_GROUP | WS_TABSTOP,16,49,41,10 + CONTROL "&Append",IDC_TRACE_APPEND,"Button",BS_AUTORADIOBUTTON, + 16,64,41,10 + GROUPBOX "File Mode",IDC_STATIC,7,32,113,53 + CONTROL "&Register",IDC_TRACE_REGISTER,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,45,43,10 + CONTROL "&MMU",IDC_TRACE_MMU,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,57,43,10 + CONTROL "&Opcode",IDC_TRACE_OPCODE,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,69,43,10 + GROUPBOX "Logging",IDC_STATIC,127,32,113,53 + DEFPUSHBUTTON "OK",IDOK,62,92,50,14 + PUSHBUTTON "Cancel",IDCANCEL,135,92,50,14 +END + ///////////////////////////////////////////////////////////////////////////// // @@ -691,8 +723,8 @@ END // VS_VERSION_INFO VERSIONINFO - FILEVERSION 1,6,1,0 - PRODUCTVERSION 1,6,1,0 + FILEVERSION 1,6,2,0 + PRODUCTVERSION 1,6,2,0 FILEFLAGSMASK 0x3fL #ifdef _DEBUG FILEFLAGS 0x1L @@ -709,12 +741,12 @@ BEGIN BEGIN VALUE "CompanyName", "Christoph Gießelink & Sebastien Carlier\0" VALUE "FileDescription", "HP38/39/40/48/49 Emulator\0" - VALUE "FileVersion", "1, 6, 1, 0\0" + VALUE "FileVersion", "1, 6, 2, 0\0" VALUE "InternalName", "Emu48\0" - VALUE "LegalCopyright", "Copyright © 2018\0" + VALUE "LegalCopyright", "Copyright © 2019\0" VALUE "OriginalFilename", "Emu48.exe\0" VALUE "ProductName", "Emu48\0" - VALUE "ProductVersion", "1, 6, 1, 0\0" + VALUE "ProductVersion", "1, 6, 2, 0\0" END END BLOCK "VarFileInfo" @@ -896,6 +928,11 @@ BEGIN BEGIN MENUITEM "&Step Over Interrupts", ID_INTR_STEPOVERINT END + POPUP "&Trace" + BEGIN + MENUITEM "&Settings...", ID_TRACE_SETTINGS + MENUITEM "&Enable", ID_TRACE_ENABLE + END POPUP "&Info" BEGIN MENUITEM "&Last Instructions...", ID_INFO_LASTINSTRUCTIONS diff --git a/Sources/Emu48/ENGINE.C b/Sources/Emu48/ENGINE.C index cb33486..8a0cec3 100644 --- a/Sources/Emu48/ENGINE.C +++ b/Sources/Emu48/ENGINE.C @@ -55,6 +55,8 @@ WORD wInstrSize = 256; // size of last instruction array WORD wInstrWp; // write pointer of instruction array WORD wInstrRp; // read pointer of instruction array +VOID (*fnOutTrace)(VOID) = NULL; // callback function for file trace + static INT nDbgRplBreak = BN_ASM; // flag for RPL breakpoint detection static INT nDbgOldState = DBG_OFF; // old state of debugger for suspend/resume @@ -95,6 +97,10 @@ static __inline VOID Debugger(VOID) // debugger part UpdateDbgCycleCounter(); // update 64 bit cpu cycle counter SaveInstrAddr(Chipset.pc); // save pc in last instruction buffer + if (fnOutTrace != NULL) // has a trace function + { + fnOutTrace(); // write file trace + } nDbgRplBreak = BN_ASM; // notify ASM breakpoint diff --git a/Sources/Emu48/FILES.C b/Sources/Emu48/FILES.C index d65b12b..0bed553 100644 --- a/Sources/Emu48/FILES.C +++ b/Sources/Emu48/FILES.C @@ -192,6 +192,71 @@ VOID SetWindowPathTitle(LPCTSTR szFileName) +//################ +//# +//# BEEP Patch check +//# +//################ + +BOOL CheckForBeepPatch(VOID) +{ + typedef struct beeppatch + { + const DWORD dwAddress; // patch address + const BYTE byPattern[4]; // patch pattern + } BEEPPATCH, *PBEEPPATCH; + + // known beep patches + const BEEPPATCH s38[] = { { 0x017D0, { 0x8, 0x1, 0xB, 0x1 } } }; + const BEEPPATCH s39[] = { { 0x017BC, { 0x8, 0x1, 0xB, 0x1 } } }; + const BEEPPATCH s48[] = { { 0x017A6, { 0x8, 0x1, 0xB, 0x1 } } }; + const BEEPPATCH s49[] = { { 0x4157A, { 0x8, 0x1, 0xB, 0x1 } }, // 1.18/1.19-5/1.19-6 + { 0x41609, { 0x8, 0x1, 0xB, 0x1 } } }; // 1.24/2.01/2.09 + + const BEEPPATCH *psData; + UINT nDataItems; + BOOL bMatch; + + switch (cCurrentRomType) + { + case '6': + case 'A': // HP38G + psData = s38; + nDataItems = ARRAYSIZEOF(s38); + break; + case 'E': // HP39/40G + psData = s39; + nDataItems = ARRAYSIZEOF(s39); + break; + case 'S': // HP48SX + case 'G': // HP48GX + psData = s48; + nDataItems = ARRAYSIZEOF(s48); + break; + case 'X': // HP49G + psData = s49; + nDataItems = ARRAYSIZEOF(s49); + break; + default: + psData = NULL; + nDataItems = 0; + } + + // check if one data set match + for (bMatch = FALSE; !bMatch && nDataItems > 0; --nDataItems) + { + _ASSERT(pbyRom != NULL && psData != NULL); + + // pattern matching? + bMatch = (psData->dwAddress + ARRAYSIZEOF(psData->byPattern) < dwRomSize) + && (memcmp(&pbyRom[psData->dwAddress],psData->byPattern,ARRAYSIZEOF(psData->byPattern))) == 0; + ++psData; // next data set + } + return bMatch; +} + + + //################ //# //# Patch @@ -788,6 +853,7 @@ BOOL NewDocument(VOID) if (!DisplayChooseKml(0)) goto restore; if (!InitKML(szCurrentKml,FALSE)) goto restore; Chipset.type = cCurrentRomType; + CrcRom(&Chipset.wRomCrc); // save fingerprint of loaded ROM if (Chipset.type == '6' || Chipset.type == 'A') // HP38G { @@ -1731,7 +1797,7 @@ static HPALETTE CreateBIPalette(BITMAPINFOHEADER CONST *lpbi) return hpal; } -static HBITMAP DecodeBmp(LPBMPFILE pBmp) +static HBITMAP DecodeBmp(LPBMPFILE pBmp,BOOL bPalette) { LPBITMAPFILEHEADER pBmfh; LPBITMAPINFO pBmi; @@ -1769,7 +1835,7 @@ static HBITMAP DecodeBmp(LPBMPFILE pBmp) else { dwFileSize += WIDTHBYTES(pBmi->bmiHeader.biWidth * pBmi->bmiHeader.biBitCount) - * labs(pBmi->bmiHeader.biHeight); + * labs(pBmi->bmiHeader.biHeight); } if (pBmp->dwFileSize < dwFileSize) return NULL; @@ -1781,7 +1847,7 @@ static HBITMAP DecodeBmp(LPBMPFILE pBmp) pBmi, DIB_RGB_COLORS)); if (hBitmap == NULL) return NULL; - if (hPalette == NULL) + if (bPalette && hPalette == NULL) { hPalette = CreateBIPalette(&pBmi->bmiHeader); // save old palette @@ -1812,7 +1878,7 @@ static BOOL ReadGifWord(LPBMPFILE pGif, INT *n) return FALSE; } -static HBITMAP DecodeGif(LPBMPFILE pBmp,DWORD *pdwTransparentColor) +static HBITMAP DecodeGif(LPBMPFILE pBmp,DWORD *pdwTransparentColor,BOOL bPalette) { // this implementation base on the GIF image file // decoder engine of Free42 (c) by Thomas Okken @@ -2306,7 +2372,7 @@ static HBITMAP DecodeGif(LPBMPFILE pBmp,DWORD *pdwTransparentColor) _ASSERT(bDecoding == FALSE); // decoding successful // normal decoding exit - if (hPalette == NULL) + if (bPalette && hPalette == NULL) { hPalette = CreateBIPalette((PBITMAPINFOHEADER) &bmi); // save old palette @@ -2323,7 +2389,7 @@ quit: return hBitmap; } -static HBITMAP DecodePng(LPBMPFILE pBmp) +static HBITMAP DecodePng(LPBMPFILE pBmp,BOOL bPalette) { // this implementation use the PNG image file decoder // engine of Copyright (c) 2005-2018 Lode Vandevenne @@ -2348,7 +2414,7 @@ static HBITMAP DecodePng(LPBMPFILE pBmp) if (uError) goto quit; ZeroMemory(&bmi,sizeof(bmi)); // init bitmap info - bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader); + bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmi.bmiHeader.biWidth = (LONG) uWidth; bmi.bmiHeader.biHeight = (LONG) uHeight; bmi.bmiHeader.biPlanes = 1; @@ -2386,7 +2452,7 @@ static HBITMAP DecodePng(LPBMPFILE pBmp) _ASSERT((DWORD) (pbyLine - pbyPixels) <= bmi.bmiHeader.biSizeImage); } - if (hPalette == NULL) + if (bPalette && hPalette == NULL) { hPalette = CreateBIPalette((PBITMAPINFOHEADER) &bmi); // save old palette @@ -2408,7 +2474,7 @@ quit: return hBitmap; } -HBITMAP LoadBitmapFile(LPCTSTR szFilename) +HBITMAP LoadBitmapFile(LPCTSTR szFilename,BOOL bPalette) { HANDLE hFile; HANDLE hMap; @@ -2439,7 +2505,7 @@ HBITMAP LoadBitmapFile(LPCTSTR szFilename) // check for bitmap file header "BM" if (Bmp.dwFileSize >= 2 && *(WORD *) Bmp.pbyFile == 0x4D42) { - hBitmap = DecodeBmp(&Bmp); + hBitmap = DecodeBmp(&Bmp,bPalette); break; } @@ -2447,14 +2513,14 @@ HBITMAP LoadBitmapFile(LPCTSTR szFilename) if ( Bmp.dwFileSize >= 6 && (memcmp(Bmp.pbyFile,"GIF87a",6) == 0 || memcmp(Bmp.pbyFile,"GIF89a",6) == 0)) { - hBitmap = DecodeGif(&Bmp,&dwTColor); + hBitmap = DecodeGif(&Bmp,&dwTColor,bPalette); break; } // check for PNG file header if (Bmp.dwFileSize >= 8 && memcmp(Bmp.pbyFile,"\x89PNG\r\n\x1a\n",8) == 0) { - hBitmap = DecodePng(&Bmp); + hBitmap = DecodePng(&Bmp,bPalette); break; } diff --git a/Sources/Emu48/KML.C b/Sources/Emu48/KML.C index 331ff10..7a87943 100644 --- a/Sources/Emu48/KML.C +++ b/Sources/Emu48/KML.C @@ -895,6 +895,8 @@ static KmlLine* ParseLines(BOOL bInclude) if (eToken == TOK_INCLUDE) { LPTSTR szFilename; + UINT nLexLineKml; + eToken = Lex(LEX_PARAM); // get include parameter in 'szLexString' if (eToken != TOK_STRING) // not a string (token don't begin with ") { @@ -903,6 +905,7 @@ static KmlLine* ParseLines(BOOL bInclude) } szFilename = szLexString; // save pointer to allocated memory szLexString = NULL; + nLexLineKml = nLexLine; // save line number eToken = Lex(LEX_PARAM); // decode argument if (eToken != TOK_EOL) { @@ -925,7 +928,10 @@ static KmlLine* ParseLines(BOOL bInclude) } free(szFilename); // free filename string if (pLine == NULL) // parsing error + { + nLexLine = nLexLineKml; // restore line number goto abort; + } while (pLine->pNext) pLine=pLine->pNext; continue; } @@ -1096,6 +1102,8 @@ static KmlBlock* ParseBlocks(BOOL bInclude, BOOL bEndTokenEn) if (eToken == TOK_INCLUDE) { LPTSTR szFilename; + UINT nLexLineKml; + eToken = Lex(LEX_PARAM); // get include parameter in 'szLexString' if (eToken != TOK_STRING) // not a string (token don't begin with ") { @@ -1104,6 +1112,7 @@ static KmlBlock* ParseBlocks(BOOL bInclude, BOOL bEndTokenEn) } szFilename = szLexString; // save pointer to allocated memory szLexString = NULL; + nLexLineKml = nLexLine; // save line number eToken = Lex(LEX_PARAM); // decode argument if (eToken != TOK_EOL) { @@ -1117,7 +1126,10 @@ static KmlBlock* ParseBlocks(BOOL bInclude, BOOL bEndTokenEn) pBlock = pFirst = IncludeBlocks(bInclude,szFilename); free(szFilename); // free filename string if (pBlock == NULL) // parsing error + { + nLexLine = nLexLineKml; // restore line number goto abort; + } while (pBlock->pNext) pBlock = pBlock->pNext; continue; } @@ -2614,9 +2626,14 @@ BOOL InitKML(LPCTSTR szFilename, BOOL bNoLog) if (!CrcRom(&wRomCrc)) // build patched ROM fingerprint and check for unpacked data { AddToLog(_T("Error, packed ROM image detected.")); - UnmapRom(); // free memory goto quit; } + if (CheckForBeepPatch()) // check if ROM contain beep patches + { + AddToLog(_T("Warning, ROM beep patch detected. Remove beep patches please.")); + bNoLog = FALSE; + bAlwaysDisplayLog = TRUE; + } ResizeMainBitmap(nScaleMul,nScaleDiv); // resize main picture CreateLcdBitmap(); diff --git a/Sources/Emu48/LODEPNG.C b/Sources/Emu48/LODEPNG.C index d67b3eb..ae71df3 100644 --- a/Sources/Emu48/LODEPNG.C +++ b/Sources/Emu48/LODEPNG.C @@ -1,7 +1,7 @@ /* -LodePNG version 20180611 +LodePNG version 20190914 -Copyright (c) 2005-2018 Lode Vandevenne +Copyright (c) 2005-2019 Lode Vandevenne This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages @@ -30,16 +30,21 @@ Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for #include "lodepng.h" -#include -#include -#include +#ifdef LODEPNG_COMPILE_DISK +#include /* LONG_MAX */ +#include /* file handling */ +#endif /* LODEPNG_COMPILE_DISK */ + +#ifdef LODEPNG_COMPILE_ALLOCATORS +#include /* allocations */ +#endif /* LODEPNG_COMPILE_ALLOCATORS */ #if defined(_MSC_VER) && (_MSC_VER >= 1310) /*Visual Studio: A few warning types are not desired here.*/ #pragma warning( disable : 4244 ) /*implicit conversions: not warned by gcc -Wall -Wextra and requires too much casts*/ #pragma warning( disable : 4996 ) /*VS does not like fopen, but fopen_s is not standard C so unusable here*/ #endif /*_MSC_VER */ -const char* LODEPNG_VERSION_STRING = "20180611"; +const char* LODEPNG_VERSION_STRING = "20190914"; /* This source file is built up in the following large parts. The code sections @@ -50,6 +55,12 @@ with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way -The C++ wrapper around all of the above */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // Tools for C, and common code for PNG and Zlib. // */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + /*The malloc, realloc and free functions defined here with "lodepng_" in front of the name, so that you can easily change them to others related to your platform if needed. Everything else in the code calls these. Pass @@ -60,39 +71,95 @@ lodepng source code. Don't forget to remove "static" if you copypaste them from here.*/ #ifdef LODEPNG_COMPILE_ALLOCATORS -static void* lodepng_malloc(size_t size) -{ +static void* lodepng_malloc(size_t size) { #ifdef LODEPNG_MAX_ALLOC if(size > LODEPNG_MAX_ALLOC) return 0; #endif return malloc(size); } -static void* lodepng_realloc(void* ptr, size_t new_size) -{ +static void* lodepng_realloc(void* ptr, size_t new_size) { #ifdef LODEPNG_MAX_ALLOC if(new_size > LODEPNG_MAX_ALLOC) return 0; #endif return realloc(ptr, new_size); } -static void lodepng_free(void* ptr) -{ +static void lodepng_free(void* ptr) { free(ptr); } #else /*LODEPNG_COMPILE_ALLOCATORS*/ +/* TODO: support giving additional void* payload to the custom allocators */ void* lodepng_malloc(size_t size); void* lodepng_realloc(void* ptr, size_t new_size); void lodepng_free(void* ptr); #endif /*LODEPNG_COMPILE_ALLOCATORS*/ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* // Tools for C, and common code for PNG and Zlib. // */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ +/* convince the compiler to inline a function, for use when this measurably improves performance */ +/* inline is not available in C90, but use it when supported by the compiler */ +#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || (defined(__cplusplus) && (__cplusplus >= 199711L)) +#define LODEPNG_INLINE inline +#else +#define LODEPNG_INLINE /* not available */ +#endif + +/* restrict is not available in C90, but use it when supported by the compiler */ +#if (defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1)) ||\ + (defined(_MSC_VER) && (_MSC_VER >= 1400)) || (defined(__WATCOMC__) && (__WATCOMC__ >= 1250)) +#define LODEPNG_RESTRICT __restrict +#else +#define LODEPNG_RESTRICT /* not available */ +#endif + +/* Replacements for C library functions memcpy and strlen, to support those platforms +where a full C library is not available. The compiler can recognize them and compile +to something as fast. */ + +static void lodepng_memcpy(void* LODEPNG_RESTRICT dst, + const void* LODEPNG_RESTRICT src, size_t size) { + size_t i; + for(i = 0; i < size; i++) ((char*)dst)[i] = ((const char*)src)[i]; +} + +/* does not check memory out of bounds, do not use on untrusted data */ +static size_t lodepng_strlen(const char* a) { + const char* orig = a; + /* avoid warning about unused function in case of disabled COMPILE... macros */ + (void)lodepng_strlen; + while(*a) a++; + return (size_t)(a - orig); +} #define LODEPNG_MAX(a, b) (((a) > (b)) ? (a) : (b)) +#define LODEPNG_MIN(a, b) (((a) < (b)) ? (a) : (b)) +#define LODEPNG_ABS(x) ((x) < 0 ? -(x) : (x)) + + +#ifdef LODEPNG_COMPILE_DECODER +/* Safely check if multiplying two integers will overflow (no undefined +behavior, compiler removing the code, etc...) and output result. */ +static int lodepng_mulofl(size_t a, size_t b, size_t* result) { + *result = a * b; /* Unsigned multiplication is well defined and safe in C90 */ + return (a != 0 && *result / a != b); +} + +/* Safely check if adding two integers will overflow (no undefined +behavior, compiler removing the code, etc...) and output result. */ +static int lodepng_addofl(size_t a, size_t b, size_t* result) { + *result = a + b; /* Unsigned addition is well defined and safe in C90 */ + return *result < a; +} + +#ifdef LODEPNG_COMPILE_ZLIB +/* Safely check if a + b > c, even if overflow could happen. */ +static int lodepng_gtofl(size_t a, size_t b, size_t c) { + size_t d; + if(lodepng_addofl(a, b, &d)) return 1; + return d > c; +} +#endif /*LODEPNG_COMPILE_ZLIB*/ +#endif /*LODEPNG_COMPILE_DECODER*/ + /* Often in case of an error a value is assigned to a variable and then it breaks @@ -101,8 +168,7 @@ It makes the error handling code shorter and more readable. Example: if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83); */ -#define CERROR_BREAK(errorvar, code)\ -{\ +#define CERROR_BREAK(errorvar, code){\ errorvar = code;\ break;\ } @@ -111,22 +177,19 @@ Example: if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83); #define ERROR_BREAK(code) CERROR_BREAK(error, code) /*Set error var to the error code, and return it.*/ -#define CERROR_RETURN_ERROR(errorvar, code)\ -{\ +#define CERROR_RETURN_ERROR(errorvar, code){\ errorvar = code;\ return code;\ } /*Try the code, if it returns error, also return the error.*/ -#define CERROR_TRY_RETURN(call)\ -{\ +#define CERROR_TRY_RETURN(call){\ unsigned error = call;\ if(error) return error;\ } /*Set error var to the error code, and return from the void function.*/ -#define CERROR_RETURN(errorvar, code)\ -{\ +#define CERROR_RETURN(errorvar, code){\ errorvar = code;\ return;\ } @@ -141,30 +204,26 @@ About uivector, ucvector and string: */ #ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_ENCODER /*dynamic vector of unsigned ints*/ -typedef struct uivector -{ +typedef struct uivector { unsigned* data; size_t size; /*size in number of unsigned longs*/ size_t allocsize; /*allocated size in bytes*/ } uivector; -static void uivector_cleanup(void* p) -{ +static void uivector_cleanup(void* p) { ((uivector*)p)->size = ((uivector*)p)->allocsize = 0; lodepng_free(((uivector*)p)->data); ((uivector*)p)->data = NULL; } /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned uivector_reserve(uivector* p, size_t allocsize) -{ - if(allocsize > p->allocsize) - { - size_t newsize = (allocsize > p->allocsize * 2) ? allocsize : (allocsize * 3 / 2); +static unsigned uivector_reserve(uivector* p, size_t allocsize) { + if(allocsize > p->allocsize) { + size_t newsize = (allocsize > p->allocsize * 2u) ? allocsize : ((allocsize * 3u) >> 1u); void* data = lodepng_realloc(p->data, newsize); - if(data) - { + if(data) { p->allocsize = newsize; p->data = (unsigned*)data; } @@ -174,32 +233,27 @@ static unsigned uivector_reserve(uivector* p, size_t allocsize) } /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned uivector_resize(uivector* p, size_t size) -{ +static unsigned uivector_resize(uivector* p, size_t size) { if(!uivector_reserve(p, size * sizeof(unsigned))) return 0; p->size = size; return 1; /*success*/ } /*resize and give all new elements the value*/ -static unsigned uivector_resizev(uivector* p, size_t size, unsigned value) -{ +static unsigned uivector_resizev(uivector* p, size_t size, unsigned value) { size_t oldsize = p->size, i; if(!uivector_resize(p, size)) return 0; for(i = oldsize; i < size; ++i) p->data[i] = value; return 1; } -static void uivector_init(uivector* p) -{ +static void uivector_init(uivector* p) { p->data = NULL; p->size = p->allocsize = 0; } -#ifdef LODEPNG_COMPILE_ENCODER /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned uivector_push_back(uivector* p, unsigned c) -{ +static unsigned uivector_push_back(uivector* p, unsigned c) { if(!uivector_resize(p, p->size + 1)) return 0; p->data[p->size - 1] = c; return 1; @@ -210,22 +264,18 @@ static unsigned uivector_push_back(uivector* p, unsigned c) /* /////////////////////////////////////////////////////////////////////////// */ /*dynamic vector of unsigned chars*/ -typedef struct ucvector -{ +typedef struct ucvector { unsigned char* data; size_t size; /*used size*/ size_t allocsize; /*allocated size*/ } ucvector; /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned ucvector_reserve(ucvector* p, size_t allocsize) -{ - if(allocsize > p->allocsize) - { - size_t newsize = (allocsize > p->allocsize * 2) ? allocsize : (allocsize * 3 / 2); +static unsigned ucvector_reserve(ucvector* p, size_t allocsize) { + if(allocsize > p->allocsize) { + size_t newsize = (allocsize > p->allocsize * 2u) ? allocsize : ((allocsize * 3u) >> 1u); void* data = lodepng_realloc(p->data, newsize); - if(data) - { + if(data) { p->allocsize = newsize; p->data = (unsigned char*)data; } @@ -235,8 +285,7 @@ static unsigned ucvector_reserve(ucvector* p, size_t allocsize) } /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned ucvector_resize(ucvector* p, size_t size) -{ +static unsigned ucvector_resize(ucvector* p, size_t size) { if(!ucvector_reserve(p, size * sizeof(unsigned char))) return 0; p->size = size; return 1; /*success*/ @@ -244,25 +293,22 @@ static unsigned ucvector_resize(ucvector* p, size_t size) #ifdef LODEPNG_COMPILE_PNG -static void ucvector_cleanup(void* p) -{ +static void ucvector_cleanup(void* p) { ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0; lodepng_free(((ucvector*)p)->data); ((ucvector*)p)->data = NULL; } -static void ucvector_init(ucvector* p) -{ +static void ucvector_init(ucvector* p) { p->data = NULL; p->size = p->allocsize = 0; } #endif /*LODEPNG_COMPILE_PNG*/ #ifdef LODEPNG_COMPILE_ZLIB -/*you can both convert from vector to buffer&size and vica versa. If you use +/*you can both convert from vector to buffer&size and vice versa. If you use init_buffer to take over a buffer and size, it is not needed to use cleanup*/ -static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size) -{ +static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size) { p->data = buffer; p->allocsize = p->size = size; } @@ -270,8 +316,7 @@ static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size #if (defined(LODEPNG_COMPILE_PNG) && defined(LODEPNG_COMPILE_ANCILLARY_CHUNKS)) || defined(LODEPNG_COMPILE_ENCODER) /*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned ucvector_push_back(ucvector* p, unsigned char c) -{ +static unsigned ucvector_push_back(ucvector* p, unsigned char c) { if(!ucvector_resize(p, p->size + 1)) return 0; p->data[p->size - 1] = c; return 1; @@ -283,57 +328,41 @@ static unsigned ucvector_push_back(ucvector* p, unsigned char c) #ifdef LODEPNG_COMPILE_PNG #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -/*returns 1 if success, 0 if failure ==> nothing done*/ -static unsigned string_resize(char** out, size_t size) -{ - char* data = (char*)lodepng_realloc(*out, size + 1); - if(data) - { - data[size] = 0; /*null termination char*/ - *out = data; - } - return data != 0; -} -/*init a {char*, size_t} pair for use as string*/ -static void string_init(char** out) -{ - *out = NULL; - string_resize(out, 0); -} - -/*free the above pair again*/ -static void string_cleanup(char** out) -{ +/*free string pointer and set it to NULL*/ +static void string_cleanup(char** out) { lodepng_free(*out); *out = NULL; } -static void string_set(char** out, const char* in) -{ - size_t insize = strlen(in), i; - if(string_resize(out, insize)) - { - for(i = 0; i != insize; ++i) - { - (*out)[i] = in[i]; +/* dynamically allocates a new string with a copy of the null terminated input text */ +static char* alloc_string(const char* in) { + size_t insize = lodepng_strlen(in); + char* out = (char*)lodepng_malloc(insize + 1); + if(out) { + size_t i; + for(i = 0; i != insize; ++i) { + out[i] = in[i]; } + out[i] = 0; } + return out; } #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ #endif /*LODEPNG_COMPILE_PNG*/ /* ////////////////////////////////////////////////////////////////////////// */ -unsigned lodepng_read32bitInt(const unsigned char* buffer) -{ - return (unsigned)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]); +#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG) +static unsigned lodepng_read32bitInt(const unsigned char* buffer) { + return (((unsigned)buffer[0] << 24u) | ((unsigned)buffer[1] << 16u) | + ((unsigned)buffer[2] << 8u) | (unsigned)buffer[3]); } +#endif /*defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG)*/ #if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER) /*buffer must have at least 4 allocated bytes available*/ -static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) -{ +static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) { buffer[0] = (unsigned char)((value >> 24) & 0xff); buffer[1] = (unsigned char)((value >> 16) & 0xff); buffer[2] = (unsigned char)((value >> 8) & 0xff); @@ -341,14 +370,6 @@ static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) } #endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)*/ -#ifdef LODEPNG_COMPILE_ENCODER -static void lodepng_add32bitInt(ucvector* buffer, unsigned value) -{ - ucvector_resize(buffer, buffer->size + 4); /*todo: give error if resize failed*/ - lodepng_set32bitInt(&buffer->data[buffer->size - 4], value); -} -#endif /*LODEPNG_COMPILE_ENCODER*/ - /* ////////////////////////////////////////////////////////////////////////// */ /* / File IO / */ /* ////////////////////////////////////////////////////////////////////////// */ @@ -356,15 +377,13 @@ static void lodepng_add32bitInt(ucvector* buffer, unsigned value) #ifdef LODEPNG_COMPILE_DISK /* returns negative value on error. This should be pure C compatible, so no fstat. */ -static long lodepng_filesize(const char* filename) -{ +static long lodepng_filesize(const char* filename) { FILE* file; long size; file = fopen(filename, "rb"); if(!file) return -1; - if(fseek(file, 0, SEEK_END) != 0) - { + if(fseek(file, 0, SEEK_END) != 0) { fclose(file); return -1; } @@ -378,8 +397,7 @@ static long lodepng_filesize(const char* filename) } /* load file into buffer that already has the correct allocated size. Returns error code.*/ -static unsigned lodepng_buffer_file(unsigned char* out, size_t size, const char* filename) -{ +static unsigned lodepng_buffer_file(unsigned char* out, size_t size, const char* filename) { FILE* file; size_t readsize; file = fopen(filename, "rb"); @@ -392,8 +410,7 @@ static unsigned lodepng_buffer_file(unsigned char* out, size_t size, const char* return 0; } -unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename) -{ +unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename) { long size = lodepng_filesize(filename); if (size < 0) return 78; *outsize = (size_t)size; @@ -405,12 +422,11 @@ unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* fil } /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ -unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename) -{ +unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename) { FILE* file; file = fopen(filename, "wb" ); if(!file) return 79; - fwrite((char*)buffer , 1 , buffersize, file); + fwrite(buffer, 1, buffersize, file); fclose(file); return 0; } @@ -425,52 +441,187 @@ unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const #ifdef LODEPNG_COMPILE_ZLIB #ifdef LODEPNG_COMPILE_ENCODER + +typedef struct { + ucvector* data; + size_t bp; +} LodePNGBitWriter; + +void LodePNGBitWriter_init(LodePNGBitWriter* writer, ucvector* data) { + writer->data = data; + writer->bp = 0; +} + /*TODO: this ignores potential out of memory errors*/ -#define addBitToStream(/*size_t**/ bitpointer, /*ucvector**/ bitstream, /*unsigned char*/ bit)\ -{\ - /*add a new byte at the end*/\ - if(((*bitpointer) & 7) == 0) ucvector_push_back(bitstream, (unsigned char)0);\ - /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/\ - (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7));\ - ++(*bitpointer);\ +#define WRITEBIT(/*size_t**/ writer, /*unsigned char*/ bit){\ + /* append new byte */\ + if(((writer->bp) & 7u) == 0) ucvector_push_back(writer->data, (unsigned char)0);\ + (writer->data->data[writer->data->size - 1]) |= (bit << ((writer->bp) & 7u));\ + ++writer->bp;\ } -static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) -{ - size_t i; - for(i = 0; i != nbits; ++i) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1)); +/* LSB of value is written first, and LSB of bytes is used first */ +static void writeBits(LodePNGBitWriter* writer, unsigned value, size_t nbits) { + if(nbits == 1) { /* compiler should statically compile this case if nbits == 1 */ + WRITEBIT(writer, value); + } else { + /* TODO: increase output size nly once here rather than in each WRITEBIT */ + size_t i; + for(i = 0; i != nbits; ++i) { + WRITEBIT(writer, (unsigned char)((value >> i) & 1)); + } + } } -static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) -{ +/* This one is to use for adding huffman symbol, the value bits are written MSB first */ +static void writeBitsReversed(LodePNGBitWriter* writer, unsigned value, size_t nbits) { size_t i; - for(i = 0; i != nbits; ++i) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1)); + for(i = 0; i != nbits; ++i) { + /* TODO: increase output size only once here rather than in each WRITEBIT */ + WRITEBIT(writer, (unsigned char)((value >> (nbits - 1u - i)) & 1u)); + } } #endif /*LODEPNG_COMPILE_ENCODER*/ #ifdef LODEPNG_COMPILE_DECODER -#define READBIT(bitpointer, bitstream) ((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1) +typedef struct { + const unsigned char* data; + size_t size; /*size of data in bytes*/ + size_t bitsize; /*size of data in bits, end of valid bp values, should be 8*size*/ + size_t bp; + unsigned buffer; /*buffer for reading bits. NOTE: 'unsigned' must support at least 32 bits*/ +} LodePNGBitReader; -static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream) -{ - unsigned char result = (unsigned char)(READBIT(*bitpointer, bitstream)); - ++(*bitpointer); - return result; +/* data size argument is in bytes. Returns error if size too large causing overflow */ +static unsigned LodePNGBitReader_init(LodePNGBitReader* reader, const unsigned char* data, size_t size) { + size_t temp; + reader->data = data; + reader->size = size; + /* size in bits, return error if overflow (if size_t is 32 bit this supports up to 500MB) */ + if(lodepng_mulofl(size, 8u, &reader->bitsize)) return 105; + /*ensure incremented bp can be compared to bitsize without overflow even when it would be incremented 32 too much and + trying to ensure 32 more bits*/ + if(lodepng_addofl(reader->bitsize, 64u, &temp)) return 105; + reader->bp = 0; + reader->buffer = 0; + return 0; /*ok*/ } -static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) -{ - unsigned result = 0, i; - for(i = 0; i != nbits; ++i) - { - result += ((unsigned)READBIT(*bitpointer, bitstream)) << i; - ++(*bitpointer); +/* +ensureBits functions: +Ensures the reader can at least read nbits bits in one or more readBits calls, +safely even if not enough bits are available. +Returns 1 if there are enough bits available, 0 if not. +*/ + +/*See ensureBits documentation above. This one ensures exactly 1 bit */ +/*static unsigned ensureBits1(LodePNGBitReader* reader) { + if(reader->bp >= reader->bitsize) return 0; + reader->buffer = (unsigned)reader->data[reader->bp >> 3u] >> (reader->bp & 7u); + return 1; +}*/ + +/*See ensureBits documentation above. This one ensures up to 9 bits */ +static unsigned ensureBits9(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 1u < size) { + reader->buffer = (unsigned)(reader->data[start + 0]) | (unsigned)(reader->data[start + 1] << 8u); + reader->buffer >>= (reader->bp & 7u); + return 1; + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + reader->buffer >>= (reader->bp & 7u); + return reader->bp + nbits < reader->bitsize; } +} + +/*See ensureBits documentation above. This one ensures up to 17 bits */ +static unsigned ensureBits17(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 2u < size) { + reader->buffer = (unsigned)(reader->data[start + 0]) | (unsigned)(reader->data[start + 1] << 8u) | + (unsigned)(reader->data[start + 2] << 16u); + reader->buffer >>= (reader->bp & 7u); + return 1; + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= (unsigned)(reader->data[start + 1] << 8u); + reader->buffer >>= (reader->bp & 7u); + return reader->bp + nbits < reader->bitsize; + } +} + +/*See ensureBits documentation above. This one ensures up to 25 bits */ +static LODEPNG_INLINE unsigned ensureBits25(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 3u < size) { + reader->buffer = (unsigned)(reader->data[start + 0]) | (unsigned)(reader->data[start + 1] << 8u) | + (unsigned)(reader->data[start + 2] << 16u) | (unsigned)(reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + return 1; + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= (unsigned)(reader->data[start + 1] << 8u); + if(start + 2u < size) reader->buffer |= (unsigned)(reader->data[start + 2] << 16u); + reader->buffer >>= (reader->bp & 7u); + return reader->bp + nbits < reader->bitsize; + } +} + +/*See ensureBits documentation above. This one ensures up to 32 bits */ +static LODEPNG_INLINE unsigned ensureBits32(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 4u < size) { + reader->buffer = (unsigned)(reader->data[start + 0]) | (unsigned)(reader->data[start + 1] << 8u) | + (unsigned)(reader->data[start + 2] << 16u) | (unsigned)(reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + reader->buffer |= ((unsigned)(reader->data[start + 4] << 24u) << (7u - (reader->bp & 7u))); + return 1; + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= (unsigned)(reader->data[start + 1] << 8u); + if(start + 2u < size) reader->buffer |= (unsigned)(reader->data[start + 2] << 16u); + if(start + 3u < size) reader->buffer |= (unsigned)(reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + return reader->bp + nbits < reader->bitsize; + } +} + +/* Get bits without advancing the bit pointer. Must have enough bits available with ensureBits */ +static unsigned peekBits(LodePNGBitReader* reader, size_t nbits) { + return reader->buffer & ((1u << nbits) - 1u); +} + +/* Must have enough bits available with ensureBits */ +static void advanceBits(LodePNGBitReader* reader, size_t nbits) { + reader->buffer >>= nbits; + reader->bp += nbits; +} + +/* Must have enough bits available with ensureBits */ +static unsigned readBits(LodePNGBitReader* reader, size_t nbits) { + unsigned result = peekBits(reader, nbits); + advanceBits(reader, nbits); return result; } #endif /*LODEPNG_COMPILE_DECODER*/ +static unsigned reverseBits(unsigned bits, unsigned num) { + /*TODO: implement faster lookup table based version when needed*/ + unsigned i, result = 0; + for(i = 0; i < num; i++) result |= ((bits >> (num - i - 1u)) & 1u) << i; + return result; +} + /* ////////////////////////////////////////////////////////////////////////// */ /* / Deflate - Huffman / */ /* ////////////////////////////////////////////////////////////////////////// */ @@ -514,98 +665,125 @@ static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES] /* Huffman tree struct, containing multiple representations of the tree */ -typedef struct HuffmanTree -{ - unsigned* tree2d; - unsigned* tree1d; - unsigned* lengths; /*the lengths of the codes of the 1d-tree*/ +typedef struct HuffmanTree { + unsigned* codes; /*the huffman codes (bit patterns representing the symbols)*/ + unsigned* lengths; /*the lengths of the huffman codes*/ unsigned maxbitlen; /*maximum number of bits a single code can get*/ unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ + /* for reading only */ + unsigned char* table_len; /*length of symbol from lookup table, or max length if secondary lookup needed*/ + unsigned short* table_value; /*value of symbol from lookup table, or pointer to secondary table if needed*/ } HuffmanTree; -/*function used for debug purposes to draw the tree in ascii art with C++*/ -/* -static void HuffmanTree_draw(HuffmanTree* tree) -{ - std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl; - for(size_t i = 0; i != tree->tree1d.size; ++i) - { - if(tree->lengths.data[i]) - std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl; - } - std::cout << std::endl; -}*/ - -static void HuffmanTree_init(HuffmanTree* tree) -{ - tree->tree2d = 0; - tree->tree1d = 0; +static void HuffmanTree_init(HuffmanTree* tree) { + tree->codes = 0; tree->lengths = 0; + tree->table_len = 0; + tree->table_value = 0; } -static void HuffmanTree_cleanup(HuffmanTree* tree) -{ - lodepng_free(tree->tree2d); - lodepng_free(tree->tree1d); +static void HuffmanTree_cleanup(HuffmanTree* tree) { + lodepng_free(tree->codes); lodepng_free(tree->lengths); + lodepng_free(tree->table_len); + lodepng_free(tree->table_value); } -/*the tree representation used by the decoder. return value is error*/ -static unsigned HuffmanTree_make2DTree(HuffmanTree* tree) -{ - unsigned nodefilled = 0; /*up to which node it is filled*/ - unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/ - unsigned n, i; +/* amount of bits for first huffman table lookup (aka root bits), see HuffmanTree_makeTable and huffmanDecodeSymbol.*/ +/* values 8u and 9u work the fastest */ +#define FIRSTBITS 9u - tree->tree2d = (unsigned*)lodepng_malloc(tree->numcodes * 2 * sizeof(unsigned)); - if(!tree->tree2d) return 83; /*alloc fail*/ +/* make table for huffman decoding */ +static unsigned HuffmanTree_makeTable(HuffmanTree* tree) { + static const unsigned headsize = 1u << FIRSTBITS; /*size of the first table*/ + static const unsigned mask = (1u << FIRSTBITS) /*headsize*/ - 1u; + unsigned i, pointer, size; /*total table size*/ + unsigned* maxlens = (unsigned*)lodepng_malloc(headsize * sizeof(unsigned)); + if(!maxlens) return 83; /*alloc fail*/ - /* - convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means - uninited, a value >= numcodes is an address to another bit, a value < numcodes - is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as - many columns as codes - 1. - A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. - Here, the internal nodes are stored (what their 0 and 1 option point to). - There is only memory for such good tree currently, if there are more nodes - (due to too long length codes), error 55 will happen - */ - for(n = 0; n < tree->numcodes * 2; ++n) - { - tree->tree2d[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/ + /* compute maxlens: max total bit length of symbols sharing prefix in the first table*/ + for(i = 0; i < headsize; ++i) maxlens[i] = 0; + for(i = 0; i < tree->numcodes; i++) { + unsigned symbol = tree->codes[i]; + unsigned l = tree->lengths[i]; + unsigned index; + if(l <= FIRSTBITS) continue; /*symbols that fit in first table don't increase secondary table size*/ + /*get the FIRSTBITS MSBs, the MSBs of the symbol are encoded first. See later comment about the reversing*/ + index = reverseBits(symbol >> (l - FIRSTBITS), FIRSTBITS); + maxlens[index] = LODEPNG_MAX(maxlens[index], l); } + /* compute total table size: size of first table plus all secondary tables for symbols longer than FIRSTBITS */ + size = headsize; + for(i = 0; i < headsize; ++i) { + unsigned l = maxlens[i]; + if(l > FIRSTBITS) size += (1u << (l - FIRSTBITS)); + } + tree->table_len = (unsigned char*)lodepng_malloc(size * sizeof(*tree->table_len)); + tree->table_value = (unsigned short*)lodepng_malloc(size * sizeof(*tree->table_value)); + if(!tree->table_len || !tree->table_value) { + lodepng_free(maxlens); + /* freeing tree->table values is done at a higher scope */ + return 83; /*alloc fail*/ + } + /*initialize with an invalid length to indicate unused entries*/ + for(i = 0; i < size; ++i) tree->table_len[i] = 16; - for(n = 0; n < tree->numcodes; ++n) /*the codes*/ - { - for(i = 0; i != tree->lengths[n]; ++i) /*the bits for this code*/ - { - unsigned char bit = (unsigned char)((tree->tree1d[n] >> (tree->lengths[n] - i - 1)) & 1); - /*oversubscribed, see comment in lodepng_error_text*/ - if(treepos > 2147483647 || treepos + 2 > tree->numcodes) return 55; - if(tree->tree2d[2 * treepos + bit] == 32767) /*not yet filled in*/ - { - if(i + 1 == tree->lengths[n]) /*last bit*/ - { - tree->tree2d[2 * treepos + bit] = n; /*put the current code in it*/ - treepos = 0; - } - else - { - /*put address of the next step in here, first that address has to be found of course - (it's just nodefilled + 1)...*/ - ++nodefilled; - /*addresses encoded with numcodes added to it*/ - tree->tree2d[2 * treepos + bit] = nodefilled + tree->numcodes; - treepos = nodefilled; - } + /*fill in the first table for long symbols: max prefix size and pointer to secondary tables*/ + pointer = headsize; + for(i = 0; i < headsize; ++i) { + unsigned l = maxlens[i]; + if(l <= FIRSTBITS) continue; + tree->table_len[i] = l; + tree->table_value[i] = pointer; + pointer += (1u << (l - FIRSTBITS)); + } + lodepng_free(maxlens); + + /*fill in the first table for short symbols, or secondary table for long symbols*/ + for(i = 0; i < tree->numcodes; ++i) { + unsigned l = tree->lengths[i]; + unsigned symbol = tree->codes[i]; /*the huffman bit pattern. i itself is the value.*/ + /*reverse bits, because the huffman bits are given in MSB first order but the bit reader reads LSB first*/ + unsigned reverse = reverseBits(symbol, l); + if(l == 0) { + continue; + } else if(l <= FIRSTBITS) { + /*short symbol, fully in first table, replicated num times if l < FIRSTBITS*/ + unsigned num = 1u << (FIRSTBITS - l); + unsigned j; + for(j = 0; j < num; ++j) { + /*bit reader will read the l bits of symbol first, the remaining FIRSTBITS - l bits go to the MSB's*/ + unsigned index = reverse | (j << l); + if(tree->table_len[index] != 16) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ + tree->table_len[index] = l; + tree->table_value[index] = i; + } + } else { + /*long symbol, shares prefix with other long symbols in first lookup table, needs second lookup*/ + /*the FIRSTBITS MSBs of the symbol are the first table index*/ + unsigned index = reverse & mask; + unsigned maxlen = tree->table_len[index]; + /*log2 of secondary table length, should be >= l - FIRSTBITS*/ + unsigned tablelen = maxlen - FIRSTBITS; + unsigned start = tree->table_value[index]; /*starting index in secondary table*/ + unsigned num = 1u << (tablelen - (l - FIRSTBITS)); /*amount of entries of this symbol in secondary table*/ + unsigned j; + if(maxlen < l) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ + for(j = 0; j < num; ++j) { + unsigned reverse2 = reverse >> FIRSTBITS; /* l - FIRSTBITS bits */ + unsigned index2 = start + (reverse2 | (j << (l - FIRSTBITS))); + tree->table_len[index2] = l; + tree->table_value[index2] = i; } - else treepos = tree->tree2d[2 * treepos + bit] - tree->numcodes; } } - for(n = 0; n < tree->numcodes * 2; ++n) - { - if(tree->tree2d[n] == 32767) tree->tree2d[n] = 0; /*remove possible remaining 32767's*/ + /* A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. + If that is not the case (due to too long length codes), the table will not + have been fully used, and this is an error (not all bit combinations can be + decoded): an oversubscribed huffman tree, indicated by error 55. */ + for(i = 0; i < size; ++i) { + if(tree->table_len[i] == 16) return 55; } return 0; @@ -616,44 +794,40 @@ Second step for the ...makeFromLengths and ...makeFromFrequencies functions. numcodes, lengths and maxbitlen must already be filled in correctly. return value is error. */ -static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) -{ - uivector blcount; - uivector nextcode; +static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) { + unsigned* blcount; + unsigned* nextcode; unsigned error = 0; unsigned bits, n; - uivector_init(&blcount); - uivector_init(&nextcode); + tree->codes = (unsigned*)lodepng_malloc(tree->numcodes * sizeof(unsigned)); + blcount = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned)); + nextcode = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned)); + if(!tree->codes || !blcount || !nextcode) error = 83; /*alloc fail*/ - tree->tree1d = (unsigned*)lodepng_malloc(tree->numcodes * sizeof(unsigned)); - if(!tree->tree1d) error = 83; /*alloc fail*/ - - if(!uivector_resizev(&blcount, tree->maxbitlen + 1, 0) - || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0)) - error = 83; /*alloc fail*/ - - if(!error) - { + if(!error) { + for(n = 0; n != tree->maxbitlen + 1; n++) blcount[n] = nextcode[n] = 0; /*step 1: count number of instances of each code length*/ - for(bits = 0; bits != tree->numcodes; ++bits) ++blcount.data[tree->lengths[bits]]; + for(bits = 0; bits != tree->numcodes; ++bits) ++blcount[tree->lengths[bits]]; /*step 2: generate the nextcode values*/ - for(bits = 1; bits <= tree->maxbitlen; ++bits) - { - nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1; + for(bits = 1; bits <= tree->maxbitlen; ++bits) { + nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1; } /*step 3: generate all the codes*/ - for(n = 0; n != tree->numcodes; ++n) - { - if(tree->lengths[n] != 0) tree->tree1d[n] = nextcode.data[tree->lengths[n]]++; + for(n = 0; n != tree->numcodes; ++n) { + if(tree->lengths[n] != 0) { + tree->codes[n] = nextcode[tree->lengths[n]]++; + /*remove superfluous bits from the code*/ + tree->codes[n] &= ((1u << tree->lengths[n]) - 1u); + } } } - uivector_cleanup(&blcount); - uivector_cleanup(&nextcode); + lodepng_free(blcount); + lodepng_free(nextcode); - if(!error) return HuffmanTree_make2DTree(tree); - else return error; + if(!error) error = HuffmanTree_makeTable(tree); + return error; } /* @@ -662,8 +836,7 @@ by Deflate. maxbitlen is the maximum bits that a code in the tree can have. return value is error. */ static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, - size_t numcodes, unsigned maxbitlen) -{ + size_t numcodes, unsigned maxbitlen) { unsigned i; tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned)); if(!tree->lengths) return 83; /*alloc fail*/ @@ -679,8 +852,7 @@ static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* b Jyrki Katajainen, Alistair Moffat, Andrew Turpin, 1995.*/ /*chain node for boundary package merge*/ -typedef struct BPMNode -{ +typedef struct BPMNode { int weight; /*the sum of all weights in this chain*/ unsigned index; /*index of this leaf node (called "count" in the paper)*/ struct BPMNode* tail; /*the next nodes in this chain (null if last)*/ @@ -688,8 +860,7 @@ typedef struct BPMNode } BPMNode; /*lists of chains*/ -typedef struct BPMLists -{ +typedef struct BPMLists { /*memory pool*/ unsigned memsize; BPMNode* memory; @@ -703,26 +874,22 @@ typedef struct BPMLists } BPMLists; /*creates a new chain node with the given parameters, from the memory in the lists */ -static BPMNode* bpmnode_create(BPMLists* lists, int weight, unsigned index, BPMNode* tail) -{ +static BPMNode* bpmnode_create(BPMLists* lists, int weight, unsigned index, BPMNode* tail) { unsigned i; BPMNode* result; /*memory full, so garbage collect*/ - if(lists->nextfree >= lists->numfree) - { + if(lists->nextfree >= lists->numfree) { /*mark only those that are in use*/ for(i = 0; i != lists->memsize; ++i) lists->memory[i].in_use = 0; - for(i = 0; i != lists->listsize; ++i) - { + for(i = 0; i != lists->listsize; ++i) { BPMNode* node; for(node = lists->chains0[i]; node != 0; node = node->tail) node->in_use = 1; for(node = lists->chains1[i]; node != 0; node = node->tail) node->in_use = 1; } /*collect those that are free*/ lists->numfree = 0; - for(i = 0; i != lists->memsize; ++i) - { + for(i = 0; i != lists->memsize; ++i) { if(!lists->memory[i].in_use) lists->freelist[lists->numfree++] = &lists->memory[i]; } lists->nextfree = 0; @@ -736,58 +903,48 @@ static BPMNode* bpmnode_create(BPMLists* lists, int weight, unsigned index, BPMN } /*sort the leaves with stable mergesort*/ -static void bpmnode_sort(BPMNode* leaves, size_t num) -{ +static void bpmnode_sort(BPMNode* leaves, size_t num) { BPMNode* mem = (BPMNode*)lodepng_malloc(sizeof(*leaves) * num); size_t width, counter = 0; - for(width = 1; width < num; width *= 2) - { + for(width = 1; width < num; width *= 2) { BPMNode* a = (counter & 1) ? mem : leaves; BPMNode* b = (counter & 1) ? leaves : mem; size_t p; - for(p = 0; p < num; p += 2 * width) - { + for(p = 0; p < num; p += 2 * width) { size_t q = (p + width > num) ? num : (p + width); size_t r = (p + 2 * width > num) ? num : (p + 2 * width); size_t i = p, j = q, k; - for(k = p; k < r; k++) - { + for(k = p; k < r; k++) { if(i < q && (j >= r || a[i].weight <= a[j].weight)) b[k] = a[i++]; else b[k] = a[j++]; } } counter++; } - if(counter & 1) memcpy(leaves, mem, sizeof(*leaves) * num); + if(counter & 1) lodepng_memcpy(leaves, mem, sizeof(*leaves) * num); lodepng_free(mem); } /*Boundary Package Merge step, numpresent is the amount of leaves, and c is the current chain.*/ -static void boundaryPM(BPMLists* lists, BPMNode* leaves, size_t numpresent, int c, int num) -{ +static void boundaryPM(BPMLists* lists, BPMNode* leaves, size_t numpresent, int c, int num) { unsigned lastindex = lists->chains1[c]->index; - if(c == 0) - { + if(c == 0) { if(lastindex >= numpresent) return; lists->chains0[c] = lists->chains1[c]; lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, 0); - } - else - { + } else { /*sum of the weights of the head nodes of the previous lookahead chains.*/ int sum = lists->chains0[c - 1]->weight + lists->chains1[c - 1]->weight; lists->chains0[c] = lists->chains1[c]; - if(lastindex < numpresent && sum > leaves[lastindex].weight) - { + if(lastindex < numpresent && sum > leaves[lastindex].weight) { lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, lists->chains1[c]->tail); return; } lists->chains1[c] = bpmnode_create(lists, sum, lastindex, lists->chains1[c - 1]); /*in the end we are only interested in the chain of the last list, so no need to recurse if we're at the last one (this gives measurable speedup)*/ - if(num + 1 < (int)(2 * numpresent - 2)) - { + if(num + 1 < (int)(2 * numpresent - 2)) { boundaryPM(lists, leaves, numpresent, c - 1, num); boundaryPM(lists, leaves, numpresent, c - 1, num); } @@ -795,8 +952,7 @@ static void boundaryPM(BPMLists* lists, BPMNode* leaves, size_t numpresent, int } unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, - size_t numcodes, unsigned maxbitlen) -{ + size_t numcodes, unsigned maxbitlen) { unsigned error = 0; unsigned i; size_t numpresent = 0; /*number of symbols with non-zero frequency*/ @@ -808,10 +964,8 @@ unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequen leaves = (BPMNode*)lodepng_malloc(numcodes * sizeof(*leaves)); if(!leaves) return 83; /*alloc fail*/ - for(i = 0; i != numcodes; ++i) - { - if(frequencies[i] > 0) - { + for(i = 0; i != numcodes; ++i) { + if(frequencies[i] > 0) { leaves[numpresent].weight = (int)frequencies[i]; leaves[numpresent].index = i; ++numpresent; @@ -824,18 +978,13 @@ unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequen according to RFC 1951 section 3.2.7. Some decoders incorrectly require two. To make these work as well ensure there are at least two symbols. The Package-Merge code below also doesn't work correctly if there's only one - symbol, it'd give it the theoritical 0 bits but in practice zlib wants 1 bit*/ - if(numpresent == 0) - { + symbol, it'd give it the theoretical 0 bits but in practice zlib wants 1 bit*/ + if(numpresent == 0) { lengths[0] = lengths[1] = 1; /*note that for RFC 1951 section 3.2.7, only lengths[0] = 1 is needed*/ - } - else if(numpresent == 1) - { + } else if(numpresent == 1) { lengths[leaves[0].index] = 1; lengths[leaves[0].index == 0 ? 1 : 0] = 1; - } - else - { + } else { BPMLists lists; BPMNode* node; @@ -851,15 +1000,13 @@ unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequen lists.chains1 = (BPMNode**)lodepng_malloc(lists.listsize * sizeof(BPMNode*)); if(!lists.memory || !lists.freelist || !lists.chains0 || !lists.chains1) error = 83; /*alloc fail*/ - if(!error) - { + if(!error) { for(i = 0; i != lists.memsize; ++i) lists.freelist[i] = &lists.memory[i]; bpmnode_create(&lists, leaves[0].weight, 1, 0); bpmnode_create(&lists, leaves[1].weight, 2, 0); - for(i = 0; i != lists.listsize; ++i) - { + for(i = 0; i != lists.listsize; ++i) { lists.chains0[i] = &lists.memory[0]; lists.chains1[i] = &lists.memory[1]; } @@ -867,8 +1014,7 @@ unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequen /*each boundaryPM call adds one chain to the last list, and we need 2 * numpresent - 2 chains.*/ for(i = 2; i != 2 * numpresent - 2; ++i) boundaryPM(&lists, leaves, numpresent, (int)maxbitlen - 1, (int)i); - for(node = lists.chains1[maxbitlen - 1]; node; node = node->tail) - { + for(node = lists.chains1[maxbitlen - 1]; node; node = node->tail) { for(i = 0; i != node->index; ++i) ++lengths[leaves[i].index]; } } @@ -885,8 +1031,8 @@ unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequen /*Create the Huffman tree given the symbol frequencies*/ static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies, - size_t mincodes, size_t numcodes, unsigned maxbitlen) -{ + size_t mincodes, size_t numcodes, unsigned maxbitlen) { + size_t i; unsigned error = 0; while(!frequencies[numcodes - 1] && numcodes > mincodes) --numcodes; /*trim zeroes*/ tree->maxbitlen = maxbitlen; @@ -894,27 +1040,24 @@ static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigne tree->lengths = (unsigned*)lodepng_realloc(tree->lengths, numcodes * sizeof(unsigned)); if(!tree->lengths) return 83; /*alloc fail*/ /*initialize all lengths to 0*/ - memset(tree->lengths, 0, numcodes * sizeof(unsigned)); + for(i = 0; i < numcodes; i++) tree->lengths[i] = 0; error = lodepng_huffman_code_lengths(tree->lengths, frequencies, numcodes, maxbitlen); if(!error) error = HuffmanTree_makeFromLengths2(tree); return error; } -static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index) -{ - return tree->tree1d[index]; +static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index) { + return tree->codes[index]; } -static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index) -{ +static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index) { return tree->lengths[index]; } #endif /*LODEPNG_COMPILE_ENCODER*/ /*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/ -static unsigned generateFixedLitLenTree(HuffmanTree* tree) -{ +static unsigned generateFixedLitLenTree(HuffmanTree* tree) { unsigned i, error = 0; unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); if(!bitlen) return 83; /*alloc fail*/ @@ -932,8 +1075,7 @@ static unsigned generateFixedLitLenTree(HuffmanTree* tree) } /*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/ -static unsigned generateFixedDistanceTree(HuffmanTree* tree) -{ +static unsigned generateFixedDistanceTree(HuffmanTree* tree) { unsigned i, error = 0; unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); if(!bitlen) return 83; /*alloc fail*/ @@ -949,26 +1091,21 @@ static unsigned generateFixedDistanceTree(HuffmanTree* tree) #ifdef LODEPNG_COMPILE_DECODER /* -returns the code, or (unsigned)(-1) if error happened -inbitlength is the length of the complete buffer, in bits (so its byte length times 8) +returns the code. The bit reader must already have been ensured at least 15 bits */ -static unsigned huffmanDecodeSymbol(const unsigned char* in, size_t* bp, - const HuffmanTree* codetree, size_t inbitlength) -{ - unsigned treepos = 0, ct; - for(;;) - { - if(*bp >= inbitlength) return (unsigned)(-1); /*error: end of input memory reached without endcode*/ - /* - decode the symbol from the tree. The "readBitFromStream" code is inlined in - the expression below because this is the biggest bottleneck while decoding - */ - ct = codetree->tree2d[(treepos << 1) + READBIT(*bp, in)]; - ++(*bp); - if(ct < codetree->numcodes) return ct; /*the symbol is decoded, return it*/ - else treepos = ct - codetree->numcodes; /*symbol not yet decoded, instead move tree position*/ - - if(treepos >= codetree->numcodes) return (unsigned)(-1); /*error: it appeared outside the codetree*/ +static unsigned huffmanDecodeSymbol(LodePNGBitReader* reader, const HuffmanTree* codetree) { + unsigned short code = peekBits(reader, FIRSTBITS); + unsigned short l = codetree->table_len[code]; + unsigned short value = codetree->table_value[code]; + if(l <= FIRSTBITS) { + advanceBits(reader, l); + return value; + } else { + unsigned index2; + advanceBits(reader, FIRSTBITS); + index2 = value + peekBits(reader, l - FIRSTBITS); + advanceBits(reader, codetree->table_len[index2] - FIRSTBITS); + return codetree->table_value[index2]; } } #endif /*LODEPNG_COMPILE_DECODER*/ @@ -980,8 +1117,7 @@ static unsigned huffmanDecodeSymbol(const unsigned char* in, size_t* bp, /* ////////////////////////////////////////////////////////////////////////// */ /*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ -static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) -{ +static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) { /*TODO: check for out of memory errors*/ generateFixedLitLenTree(tree_ll); generateFixedDistanceTree(tree_d); @@ -989,12 +1125,10 @@ static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) /*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, - const unsigned char* in, size_t* bp, size_t inlength) -{ + LodePNGBitReader* reader) { /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ unsigned error = 0; unsigned n, HLIT, HDIST, HCLEN, i; - size_t inbitlength = inlength * 8; /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/ unsigned* bitlen_ll = 0; /*lit,len code lengths*/ @@ -1003,30 +1137,31 @@ static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, unsigned* bitlen_cl = 0; HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/ - if((*bp) + 14 > (inlength << 3)) return 49; /*error: the bit pointer is or will go past the memory*/ + if(!ensureBits17(reader, 14)) return 49; /*error: the bit pointer is or will go past the memory*/ /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ - HLIT = readBitsFromStream(bp, in, 5) + 257; + HLIT = readBits(reader, 5) + 257; /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ - HDIST = readBitsFromStream(bp, in, 5) + 1; + HDIST = readBits(reader, 5) + 1; /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ - HCLEN = readBitsFromStream(bp, in, 4) + 4; + HCLEN = readBits(reader, 4) + 4; - if((*bp) + HCLEN * 3 > (inlength << 3)) return 50; /*error: the bit pointer is or will go past the memory*/ + bitlen_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned)); + if(!bitlen_cl) return 83 /*alloc fail*/; HuffmanTree_init(&tree_cl); - while(!error) - { + while(!error) { /*read the code length codes out of 3 * (amount of code length codes) bits*/ - - bitlen_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned)); - if(!bitlen_cl) ERROR_BREAK(83 /*alloc fail*/); - - for(i = 0; i != NUM_CODE_LENGTH_CODES; ++i) - { - if(i < HCLEN) bitlen_cl[CLCL_ORDER[i]] = readBitsFromStream(bp, in, 3); - else bitlen_cl[CLCL_ORDER[i]] = 0; /*if not, it must stay 0*/ + if(lodepng_gtofl(reader->bp, HCLEN * 3, reader->bitsize)) { + ERROR_BREAK(50); /*error: the bit pointer is or will go past the memory*/ + } + for(i = 0; i != HCLEN; ++i) { + ensureBits9(reader, 3); /*out of bounds already checked above */ + bitlen_cl[CLCL_ORDER[i]] = readBits(reader, 3); + } + for(i = HCLEN; i != NUM_CODE_LENGTH_CODES; ++i) { + bitlen_cl[CLCL_ORDER[i]] = 0; } error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7); @@ -1041,78 +1176,64 @@ static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/ i = 0; - while(i < HLIT + HDIST) - { - unsigned code = huffmanDecodeSymbol(in, bp, &tree_cl, inbitlength); - if(code <= 15) /*a length code*/ - { + while(i < HLIT + HDIST) { + unsigned code; + ensureBits25(reader, 22); /* up to 15 bits for huffman code, up to 7 extra bits below*/ + code = huffmanDecodeSymbol(reader, &tree_cl); + if(code <= 15) /*a length code*/ { if(i < HLIT) bitlen_ll[i] = code; else bitlen_d[i - HLIT] = code; ++i; - } - else if(code == 16) /*repeat previous*/ - { + } else if(code == 16) /*repeat previous*/ { unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ unsigned value; /*set value to the previous code*/ if(i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/ - if((*bp + 2) > inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ - replength += readBitsFromStream(bp, in, 2); + replength += readBits(reader, 2); if(i < HLIT + 1) value = bitlen_ll[i - 1]; else value = bitlen_d[i - HLIT - 1]; /*repeat this value in the next lengths*/ - for(n = 0; n < replength; ++n) - { + for(n = 0; n < replength; ++n) { if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/ if(i < HLIT) bitlen_ll[i] = value; else bitlen_d[i - HLIT] = value; ++i; } - } - else if(code == 17) /*repeat "0" 3-10 times*/ - { + } else if(code == 17) /*repeat "0" 3-10 times*/ { unsigned replength = 3; /*read in the bits that indicate repeat length*/ - if((*bp + 3) > inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ - replength += readBitsFromStream(bp, in, 3); + replength += readBits(reader, 3); /*repeat this value in the next lengths*/ - for(n = 0; n < replength; ++n) - { + for(n = 0; n < replength; ++n) { if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/ if(i < HLIT) bitlen_ll[i] = 0; else bitlen_d[i - HLIT] = 0; ++i; } - } - else if(code == 18) /*repeat "0" 11-138 times*/ - { + } else if(code == 18) /*repeat "0" 11-138 times*/ { unsigned replength = 11; /*read in the bits that indicate repeat length*/ - if((*bp + 7) > inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ - replength += readBitsFromStream(bp, in, 7); + replength += readBits(reader, 7); /*repeat this value in the next lengths*/ - for(n = 0; n < replength; ++n) - { + for(n = 0; n < replength; ++n) { if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/ if(i < HLIT) bitlen_ll[i] = 0; else bitlen_d[i - HLIT] = 0; ++i; } + } else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ { + ERROR_BREAK(16); /*nonexistent code, this can never happen*/ } - else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ - { - if(code == (unsigned)(-1)) - { - /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol - (10=no endcode, 11=wrong jump outside of tree)*/ - error = (*bp) > inbitlength ? 10 : 11; - } - else error = 16; /*unexisting code, this can never happen*/ - break; + /*check if any of the ensureBits above went out of bounds*/ + if(reader->bp > reader->bitsize) { + /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol + (10=no endcode, 11=wrong jump outside of tree)*/ + /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ + ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ } } if(error) break; @@ -1135,65 +1256,64 @@ static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, return error; } -/*inflate a block with dynamic of fixed Huffman tree*/ -static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp, - size_t* pos, size_t inlength, unsigned btype) -{ +/*inflate a block with dynamic of fixed Huffman tree. btype must be 1 or 2.*/ +static unsigned inflateHuffmanBlock(ucvector* out, size_t* pos, LodePNGBitReader* reader, + unsigned btype) { unsigned error = 0; HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/ HuffmanTree tree_d; /*the huffman tree for distance codes*/ - size_t inbitlength = inlength * 8; HuffmanTree_init(&tree_ll); HuffmanTree_init(&tree_d); if(btype == 1) getTreeInflateFixed(&tree_ll, &tree_d); - else if(btype == 2) error = getTreeInflateDynamic(&tree_ll, &tree_d, in, bp, inlength); + else /*if(btype == 2)*/ error = getTreeInflateDynamic(&tree_ll, &tree_d, reader); - while(!error) /*decode all symbols until end reached, breaks at end code*/ - { + while(!error) /*decode all symbols until end reached, breaks at end code*/ { /*code_ll is literal, length or end code*/ - unsigned code_ll = huffmanDecodeSymbol(in, bp, &tree_ll, inbitlength); - if(code_ll <= 255) /*literal symbol*/ - { + unsigned code_ll; + ensureBits25(reader, 20); /* up to 15 for the huffman symbol, up to 5 for the length extra bits */ + code_ll = huffmanDecodeSymbol(reader, &tree_ll); + if(code_ll <= 255) /*literal symbol*/ { /*ucvector_push_back would do the same, but for some reason the two lines below run 10% faster*/ if(!ucvector_resize(out, (*pos) + 1)) ERROR_BREAK(83 /*alloc fail*/); out->data[*pos] = (unsigned char)code_ll; ++(*pos); - } - else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ - { + } else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ { unsigned code_d, distance; unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/ - size_t start, forward, backward, length; + size_t start, backward, length; /*part 1: get length base*/ length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX]; /*part 2: get extra bits and add the value of that to length*/ numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX]; - if((*bp + numextrabits_l) > inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/ - length += readBitsFromStream(bp, in, numextrabits_l); + if(numextrabits_l != 0) { + /* bits already ensured above */ + length += readBits(reader, numextrabits_l); + } /*part 3: get distance code*/ - code_d = huffmanDecodeSymbol(in, bp, &tree_d, inbitlength); - if(code_d > 29) - { - if(code_d == (unsigned)(-1)) /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ - { + ensureBits32(reader, 28); /* up to 15 for the huffman symbol, up to 13 for the extra bits */ + code_d = huffmanDecodeSymbol(reader, &tree_d); + if(code_d > 29) { + if(code_d == (unsigned)(-1)) /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ { /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol (10=no endcode, 11=wrong jump outside of tree)*/ - error = (*bp) > inlength * 8 ? 10 : 11; + ERROR_BREAK((reader->bp > reader->bitsize) ? 10 : 11); + } else { + ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/ } - else error = 18; /*error: invalid distance code (30-31 are never used)*/ - break; } distance = DISTANCEBASE[code_d]; /*part 4: get extra bits from distance*/ numextrabits_d = DISTANCEEXTRA[code_d]; - if((*bp + numextrabits_d) > inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/ - distance += readBitsFromStream(bp, in, numextrabits_d); + if(numextrabits_d != 0) { + /* bits already ensured above */ + distance += readBits(reader, numextrabits_d); + } /*part 5: fill in all the out[n] values based on the length and dist*/ start = (*pos); @@ -1202,25 +1322,27 @@ static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size if(!ucvector_resize(out, (*pos) + length)) ERROR_BREAK(83 /*alloc fail*/); if (distance < length) { - for(forward = 0; forward < length; ++forward) - { + size_t forward; + lodepng_memcpy(out->data + *pos, out->data + backward, distance); + *pos += distance; + for(forward = distance; forward < length; ++forward) { out->data[(*pos)++] = out->data[backward++]; } } else { - memcpy(out->data + *pos, out->data + backward, length); + lodepng_memcpy(out->data + *pos, out->data + backward, length); *pos += length; } - } - else if(code_ll == 256) - { + } else if(code_ll == 256) { break; /*end code, break the loop*/ + } else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ { + ERROR_BREAK(16) /* impossible */ } - else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ - { + /*check if any of the ensureBits above went out of bounds*/ + if(reader->bp > reader->bitsize) { /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol (10=no endcode, 11=wrong jump outside of tree)*/ - error = ((*bp) > inlength * 8) ? 10 : 11; - break; + /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ + ERROR_BREAK(51); /*error, bit pointer jumps past memory*/ } } @@ -1230,57 +1352,58 @@ static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size return error; } -static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength) -{ - size_t p; - unsigned LEN, NLEN, n, error = 0; +static unsigned inflateNoCompression(ucvector* out, size_t* pos, + LodePNGBitReader* reader, const LodePNGDecompressSettings* settings) { + size_t bytepos; + size_t size = reader->size; + unsigned LEN, NLEN, error = 0; /*go to first boundary of byte*/ - while(((*bp) & 0x7) != 0) ++(*bp); - p = (*bp) / 8; /*byte position*/ + bytepos = (reader->bp + 7u) >> 3u; /*read LEN (2 bytes) and NLEN (2 bytes)*/ - if(p + 4 >= inlength) return 52; /*error, bit pointer will jump past memory*/ - LEN = in[p] + 256u * in[p + 1]; p += 2; - NLEN = in[p] + 256u * in[p + 1]; p += 2; + if(bytepos + 4 >= size) return 52; /*error, bit pointer will jump past memory*/ + LEN = (unsigned)reader->data[bytepos] + (unsigned)(reader->data[bytepos + 1] << 8u); bytepos += 2; + NLEN = (unsigned)reader->data[bytepos] + (unsigned)(reader->data[bytepos + 1] << 8u); bytepos += 2; /*check if 16-bit NLEN is really the one's complement of LEN*/ - if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/ + if(!settings->ignore_nlen && LEN + NLEN != 65535) { + return 21; /*error: NLEN is not one's complement of LEN*/ + } if(!ucvector_resize(out, (*pos) + LEN)) return 83; /*alloc fail*/ /*read the literal data: LEN bytes are now stored in the out buffer*/ - if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/ - for(n = 0; n < LEN; ++n) out->data[(*pos)++] = in[p++]; + if(bytepos + LEN > size) return 23; /*error: reading outside of in buffer*/ - (*bp) = p * 8; + lodepng_memcpy(out->data + *pos, reader->data + bytepos, LEN); + *pos += LEN; + bytepos += LEN; + + reader->bp = bytepos << 3u; return error; } static unsigned lodepng_inflatev(ucvector* out, const unsigned char* in, size_t insize, - const LodePNGDecompressSettings* settings) -{ - /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/ - size_t bp = 0; + const LodePNGDecompressSettings* settings) { unsigned BFINAL = 0; size_t pos = 0; /*byte position in the out buffer*/ - unsigned error = 0; + LodePNGBitReader reader; + unsigned error = LodePNGBitReader_init(&reader, in, insize); - (void)settings; + if(error) return error; - while(!BFINAL) - { + while(!BFINAL) { unsigned BTYPE; - if(bp + 2 >= insize * 8) return 52; /*error, bit pointer will jump past memory*/ - BFINAL = readBitFromStream(&bp, in); - BTYPE = 1u * readBitFromStream(&bp, in); - BTYPE += 2u * readBitFromStream(&bp, in); + if(!ensureBits9(&reader, 3)) return 52; /*error, bit pointer will jump past memory*/ + BFINAL = readBits(&reader, 1); + BTYPE = readBits(&reader, 2); if(BTYPE == 3) return 20; /*error: invalid BTYPE*/ - else if(BTYPE == 0) error = inflateNoCompression(out, in, &bp, &pos, insize); /*no compression*/ - else error = inflateHuffmanBlock(out, in, &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/ + else if(BTYPE == 0) error = inflateNoCompression(out, &pos, &reader, settings); /*no compression*/ + else error = inflateHuffmanBlock(out, &pos, &reader, BTYPE); /*compression, BTYPE 01 or 10*/ if(error) return error; } @@ -1290,8 +1413,7 @@ static unsigned lodepng_inflatev(ucvector* out, unsigned lodepng_inflate(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, - const LodePNGDecompressSettings* settings) -{ + const LodePNGDecompressSettings* settings) { unsigned error; ucvector v; ucvector_init_buffer(&v, *out, *outsize); @@ -1303,14 +1425,10 @@ unsigned lodepng_inflate(unsigned char** out, size_t* outsize, static unsigned inflate(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, - const LodePNGDecompressSettings* settings) -{ - if(settings->custom_inflate) - { + const LodePNGDecompressSettings* settings) { + if(settings->custom_inflate) { return settings->custom_inflate(out, outsize, in, insize, settings); - } - else - { + } else { return lodepng_inflate(out, outsize, in, insize, settings); } } @@ -1325,16 +1443,9 @@ static unsigned inflate(unsigned char** out, size_t* outsize, static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258; -/*bitlen is the size in bits of the code*/ -static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen) -{ - addBitsToStreamReversed(bp, compressed, code, bitlen); -} - /*search the index in the array, that has the largest value smaller than or equal to the given value, given array must be sorted (if no value is smaller, it returns the size of the given array)*/ -static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) -{ +static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) { /*binary search (only small gain over linear). TODO: use CPU log2 instruction for getting symbols instead*/ size_t left = 1; size_t right = array_size - 1; @@ -1348,8 +1459,7 @@ static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t v return left; } -static void addLengthDistance(uivector* values, size_t length, size_t distance) -{ +static void addLengthDistance(uivector* values, size_t length, size_t distance) { /*values in encoded vector are those used by deflate: 0-255: literal bytes 256: end @@ -1372,8 +1482,7 @@ bytes as input because 3 is the minimum match length for deflate*/ static const unsigned HASH_NUM_VALUES = 65536; static const unsigned HASH_BIT_MASK = 65535; /*HASH_NUM_VALUES - 1, but C90 does not like that as initializer*/ -typedef struct Hash -{ +typedef struct Hash { int* head; /*hash value to head circular pos - can be outdated if went around window*/ /*circular pos to prev circular pos*/ unsigned short* chain; @@ -1386,8 +1495,7 @@ typedef struct Hash unsigned short* zeros; /*length of zeros streak, used as a second hash chain*/ } Hash; -static unsigned hash_init(Hash* hash, unsigned windowsize) -{ +static unsigned hash_init(Hash* hash, unsigned windowsize) { unsigned i; hash->head = (int*)lodepng_malloc(sizeof(int) * HASH_NUM_VALUES); hash->val = (int*)lodepng_malloc(sizeof(int) * windowsize); @@ -1397,8 +1505,7 @@ static unsigned hash_init(Hash* hash, unsigned windowsize) hash->headz = (int*)lodepng_malloc(sizeof(int) * (MAX_SUPPORTED_DEFLATE_LENGTH + 1)); hash->chainz = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); - if(!hash->head || !hash->chain || !hash->val || !hash->headz|| !hash->chainz || !hash->zeros) - { + if(!hash->head || !hash->chain || !hash->val || !hash->headz|| !hash->chainz || !hash->zeros) { return 83; /*alloc fail*/ } @@ -1413,8 +1520,7 @@ static unsigned hash_init(Hash* hash, unsigned windowsize) return 0; } -static void hash_cleanup(Hash* hash) -{ +static void hash_cleanup(Hash* hash) { lodepng_free(hash->head); lodepng_free(hash->val); lodepng_free(hash->chain); @@ -1426,11 +1532,9 @@ static void hash_cleanup(Hash* hash) -static unsigned getHash(const unsigned char* data, size_t size, size_t pos) -{ +static unsigned getHash(const unsigned char* data, size_t size, size_t pos) { unsigned result = 0; - if(pos + 2 < size) - { + if(pos + 2 < size) { /*A simple shift and xor hash is used. Since the data of PNGs is dominated by zeroes due to the filters, a better hash does not have a significant effect on speed in traversing the chain, and causes more time spend on @@ -1447,8 +1551,7 @@ static unsigned getHash(const unsigned char* data, size_t size, size_t pos) return result & HASH_BIT_MASK; } -static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) -{ +static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) { const unsigned char* start = data + pos; const unsigned char* end = start + MAX_SUPPORTED_DEFLATE_LENGTH; if(end > data + size) end = data + size; @@ -1459,8 +1562,7 @@ static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) } /*wpos = pos & (windowsize - 1)*/ -static void updateHashChain(Hash* hash, size_t wpos, unsigned hashval, unsigned short numzeros) -{ +static void updateHashChain(Hash* hash, size_t wpos, unsigned hashval, unsigned short numzeros) { hash->val[wpos] = (int)hashval; if(hash->head[hashval] != -1) hash->chain[wpos] = hash->head[hashval]; hash->head[hashval] = (int)wpos; @@ -1481,12 +1583,11 @@ this hash technique is one out of several ways to speed this up. */ static unsigned encodeLZ77(uivector* out, Hash* hash, const unsigned char* in, size_t inpos, size_t insize, unsigned windowsize, - unsigned minmatch, unsigned nicematch, unsigned lazymatching) -{ + unsigned minmatch, unsigned nicematch, unsigned lazymatching) { size_t pos; unsigned i, error = 0; /*for large window lengths, assume the user wants no compression loss. Otherwise, max hash chain length speedup.*/ - unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8; + unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8u; unsigned maxlazymatch = windowsize >= 8192 ? (unsigned)MAX_SUPPORTED_DEFLATE_LENGTH : 64; unsigned usezeros = 1; /*not sure if setting it to false for windowsize < 8192 is better or worse*/ @@ -1507,20 +1608,16 @@ static unsigned encodeLZ77(uivector* out, Hash* hash, if(nicematch > MAX_SUPPORTED_DEFLATE_LENGTH) nicematch = (unsigned)MAX_SUPPORTED_DEFLATE_LENGTH; - for(pos = inpos; pos < insize; ++pos) - { + for(pos = inpos; pos < insize; ++pos) { size_t wpos = pos & (windowsize - 1); /*position for in 'circular' hash buffers*/ unsigned chainlength = 0; hashval = getHash(in, insize, pos); - if(usezeros && hashval == 0) - { + if(usezeros && hashval == 0) { if(numzeros == 0) numzeros = countZeros(in, insize, pos); else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros; - } - else - { + } else { numzeros = 0; } @@ -1536,37 +1633,32 @@ static unsigned encodeLZ77(uivector* out, Hash* hash, /*search for the longest string*/ prev_offset = 0; - for(;;) - { + for(;;) { if(chainlength++ >= maxchainlength) break; current_offset = (unsigned)(hashpos <= wpos ? wpos - hashpos : wpos - hashpos + windowsize); if(current_offset < prev_offset) break; /*stop when went completely around the circular buffer*/ prev_offset = current_offset; - if(current_offset > 0) - { + if(current_offset > 0) { /*test the next characters*/ foreptr = &in[pos]; backptr = &in[pos - current_offset]; /*common case in PNGs is lots of zeros. Quickly skip over them as a speedup*/ - if(numzeros >= 3) - { + if(numzeros >= 3) { unsigned skip = hash->zeros[hashpos]; if(skip > numzeros) skip = numzeros; backptr += skip; foreptr += skip; } - while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/ - { + while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/ { ++backptr; ++foreptr; } current_length = (unsigned)(foreptr - &in[pos]); - if(current_length > length) - { + if(current_length > length) { length = current_length; /*the longest length*/ offset = current_offset; /*the offset that is related to this longest length*/ /*jump out once a length of max length is found (speed gain). This also jumps @@ -1577,39 +1669,30 @@ static unsigned encodeLZ77(uivector* out, Hash* hash, if(hashpos == hash->chain[hashpos]) break; - if(numzeros >= 3 && length > numzeros) - { + if(numzeros >= 3 && length > numzeros) { hashpos = hash->chainz[hashpos]; if(hash->zeros[hashpos] != numzeros) break; - } - else - { + } else { hashpos = hash->chain[hashpos]; /*outdated hash value, happens if particular value was not encountered in whole last window*/ if(hash->val[hashpos] != (int)hashval) break; } } - if(lazymatching) - { - if(!lazy && length >= 3 && length <= maxlazymatch && length < MAX_SUPPORTED_DEFLATE_LENGTH) - { + if(lazymatching) { + if(!lazy && length >= 3 && length <= maxlazymatch && length < MAX_SUPPORTED_DEFLATE_LENGTH) { lazy = 1; lazylength = length; lazyoffset = offset; continue; /*try the next byte*/ } - if(lazy) - { + if(lazy) { lazy = 0; if(pos == 0) ERROR_BREAK(81); - if(length > lazylength + 1) - { + if(length > lazylength + 1) { /*push the previous character as literal*/ if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(83 /*alloc fail*/); - } - else - { + } else { length = lazylength; offset = lazyoffset; hash->head[hashval] = -1; /*the same hashchain update will be done, this ensures no wrong alteration*/ @@ -1621,31 +1704,22 @@ static unsigned encodeLZ77(uivector* out, Hash* hash, if(length >= 3 && offset > windowsize) ERROR_BREAK(86 /*too big (or overflown negative) offset*/); /*encode it as length/distance pair or literal value*/ - if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ - { + if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ { if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); - } - else if(length < minmatch || (length == 3 && offset > 4096)) - { + } else if(length < minmatch || (length == 3 && offset > 4096)) { /*compensate for the fact that longer offsets have more extra bits, a length of only 3 may be not worth it then*/ if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); - } - else - { + } else { addLengthDistance(out, length, offset); - for(i = 1; i < length; ++i) - { + for(i = 1; i < length; ++i) { ++pos; wpos = pos & (windowsize - 1); hashval = getHash(in, insize, pos); - if(usezeros && hashval == 0) - { + if(usezeros && hashval == 0) { if(numzeros == 0) numzeros = countZeros(in, insize, pos); else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros; - } - else - { + } else { numzeros = 0; } updateHashChain(hash, wpos, hashval, numzeros); @@ -1658,15 +1732,13 @@ static unsigned encodeLZ77(uivector* out, Hash* hash, /* /////////////////////////////////////////////////////////////////////////// */ -static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) -{ +static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) { /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ - size_t i, j, numdeflateblocks = (datasize + 65534) / 65535; + size_t i, j, numdeflateblocks = (datasize + 65534u) / 65535u; unsigned datapos = 0; - for(i = 0; i != numdeflateblocks; ++i) - { + for(i = 0; i != numdeflateblocks; ++i) { unsigned BFINAL, BTYPE, LEN, NLEN; unsigned char firstbyte; @@ -1677,17 +1749,16 @@ static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, s ucvector_push_back(out, firstbyte); LEN = 65535; - if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos; + if(datasize - datapos < 65535u) LEN = (unsigned)datasize - datapos; NLEN = 65535 - LEN; ucvector_push_back(out, (unsigned char)(LEN & 255)); - ucvector_push_back(out, (unsigned char)(LEN >> 8)); + ucvector_push_back(out, (unsigned char)(LEN >> 8u)); ucvector_push_back(out, (unsigned char)(NLEN & 255)); - ucvector_push_back(out, (unsigned char)(NLEN >> 8)); + ucvector_push_back(out, (unsigned char)(NLEN >> 8u)); /*Decompressed data*/ - for(j = 0; j < 65535 && datapos < datasize; ++j) - { + for(j = 0; j < 65535 && datapos < datasize; ++j) { ucvector_push_back(out, data[datapos++]); } } @@ -1700,16 +1771,13 @@ write the lz77-encoded data, which has lit, len and dist codes, to compressed st tree_ll: the tree for lit and len codes. tree_d: the tree for distance codes. */ -static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded, - const HuffmanTree* tree_ll, const HuffmanTree* tree_d) -{ +static void writeLZ77data(LodePNGBitWriter* writer, const uivector* lz77_encoded, + const HuffmanTree* tree_ll, const HuffmanTree* tree_d) { size_t i = 0; - for(i = 0; i != lz77_encoded->size; ++i) - { + for(i = 0; i != lz77_encoded->size; ++i) { unsigned val = lz77_encoded->data[i]; - addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_ll, val), HuffmanTree_getLength(tree_ll, val)); - if(val > 256) /*for a length code, 3 more things have to be added*/ - { + writeBitsReversed(writer, HuffmanTree_getCode(tree_ll, val), HuffmanTree_getLength(tree_ll, val)); + if(val > 256) /*for a length code, 3 more things have to be added*/ { unsigned length_index = val - FIRST_LENGTH_CODE_INDEX; unsigned n_length_extra_bits = LENGTHEXTRA[length_index]; unsigned length_extra_bits = lz77_encoded->data[++i]; @@ -1720,19 +1788,18 @@ static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encode unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index]; unsigned distance_extra_bits = lz77_encoded->data[++i]; - addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits); - addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_d, distance_code), + writeBits(writer, length_extra_bits, n_length_extra_bits); + writeBitsReversed(writer, HuffmanTree_getCode(tree_d, distance_code), HuffmanTree_getLength(tree_d, distance_code)); - addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits); + writeBits(writer, distance_extra_bits, n_distance_extra_bits); } } } /*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/ -static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, +static unsigned deflateDynamic(LodePNGBitWriter* writer, Hash* hash, const unsigned char* data, size_t datapos, size_t dataend, - const LodePNGCompressSettings* settings, unsigned final) -{ + const LodePNGCompressSettings* settings, unsigned final) { unsigned error = 0; /* @@ -1742,7 +1809,7 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, another huffman tree is used for the dist values ("d"). These two trees are stored using their code lengths, and to compress even more these code lengths are also run-length encoded and huffman compressed. This gives a huffman tree - of code lengths "cl". The code lenghts used to describe this third tree are + of code lengths "cl". The code lengths used to describe this third tree are the code length code lengths ("clcl"). */ @@ -1754,8 +1821,8 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, uivector frequencies_ll; /*frequency of lit,len codes*/ uivector frequencies_d; /*frequency of dist codes*/ uivector frequencies_cl; /*frequency of code length codes*/ - uivector bitlen_lld; /*lit,len,dist code lenghts (int bits), literally (without repeat codes).*/ - uivector bitlen_lld_e; /*bitlen_lld encoded with repeat codes (this is a rudemtary run length compression)*/ + uivector bitlen_lld; /*lit,len,dist code lengths (int bits), literally (without repeat codes).*/ + uivector bitlen_lld_e; /*bitlen_lld encoded with repeat codes (this is a rudimentary run length compression)*/ /*bitlen_cl is the code length code lengths ("clcl"). The bit lengths of codes to represent tree_cl (these are written as is in the file, it would be crazy to compress these using yet another huffman tree that needs to be represented by yet another set of code lengths)*/ @@ -1763,7 +1830,7 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, size_t datasize = dataend - datapos; /* - Due to the huffman compression of huffman tree representations ("two levels"), there are some anologies: + Due to the huffman compression of huffman tree representations ("two levels"), there are some analogies: bitlen_lld is to tree_cl what data is to tree_ll and tree_d. bitlen_lld_e is to bitlen_lld what lz77_encoded is to data. bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded. @@ -1786,16 +1853,12 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, /*This while loop never loops due to a break at the end, it is here to allow breaking out of it to the cleanup phase on error conditions.*/ - while(!error) - { - if(settings->use_lz77) - { + while(!error) { + if(settings->use_lz77) { error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, settings->minmatch, settings->nicematch, settings->lazymatching); if(error) break; - } - else - { + } else { if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83 /*alloc fail*/); for(i = datapos; i < dataend; ++i) lz77_encoded.data[i - datapos] = data[i]; /*no LZ77, but still will be Huffman compressed*/ } @@ -1804,12 +1867,10 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, if(!uivector_resizev(&frequencies_d, 30, 0)) ERROR_BREAK(83 /*alloc fail*/); /*Count the frequencies of lit, len and dist codes*/ - for(i = 0; i != lz77_encoded.size; ++i) - { + for(i = 0; i != lz77_encoded.size; ++i) { unsigned symbol = lz77_encoded.data[i]; ++frequencies_ll.data[symbol]; - if(symbol > 256) - { + if(symbol > 256) { unsigned dist = lz77_encoded.data[i + 2]; ++frequencies_d.data[dist]; i += 3; @@ -1832,47 +1893,36 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times), 17 (3-10 zeroes), 18 (11-138 zeroes)*/ - for(i = 0; i != (unsigned)bitlen_lld.size; ++i) - { - unsigned j = 0; /*amount of repititions*/ + for(i = 0; i != (unsigned)bitlen_lld.size; ++i) { + unsigned j = 0; /*amount of repetitions*/ while(i + j + 1 < (unsigned)bitlen_lld.size && bitlen_lld.data[i + j + 1] == bitlen_lld.data[i]) ++j; - if(bitlen_lld.data[i] == 0 && j >= 2) /*repeat code for zeroes*/ - { + if(bitlen_lld.data[i] == 0 && j >= 2) /*repeat code for zeroes*/ { ++j; /*include the first zero*/ - if(j <= 10) /*repeat code 17 supports max 10 zeroes*/ - { + if(j <= 10) /*repeat code 17 supports max 10 zeroes*/ { uivector_push_back(&bitlen_lld_e, 17); uivector_push_back(&bitlen_lld_e, j - 3); - } - else /*repeat code 18 supports max 138 zeroes*/ - { + } else /*repeat code 18 supports max 138 zeroes*/ { if(j > 138) j = 138; uivector_push_back(&bitlen_lld_e, 18); uivector_push_back(&bitlen_lld_e, j - 11); } i += (j - 1); - } - else if(j >= 3) /*repeat code for value other than zero*/ - { + } else if(j >= 3) /*repeat code for value other than zero*/ { size_t k; - unsigned num = j / 6, rest = j % 6; + unsigned num = j / 6u, rest = j % 6u; uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]); - for(k = 0; k < num; ++k) - { + for(k = 0; k < num; ++k) { uivector_push_back(&bitlen_lld_e, 16); uivector_push_back(&bitlen_lld_e, 6 - 3); } - if(rest >= 3) - { + if(rest >= 3) { uivector_push_back(&bitlen_lld_e, 16); uivector_push_back(&bitlen_lld_e, rest - 3); } else j -= rest; i += j; - } - else /*too short to benefit from repeat code*/ - { + } else /*too short to benefit from repeat code*/ { uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]); } } @@ -1880,8 +1930,7 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, /*generate tree_cl, the huffmantree of huffmantrees*/ if(!uivector_resizev(&frequencies_cl, NUM_CODE_LENGTH_CODES, 0)) ERROR_BREAK(83 /*alloc fail*/); - for(i = 0; i != bitlen_lld_e.size; ++i) - { + for(i = 0; i != bitlen_lld_e.size; ++i) { ++frequencies_cl.data[bitlen_lld_e.data[i]]; /*after a repeat code come the bits that specify the number of repetitions, those don't need to be in the frequencies_cl calculation*/ @@ -1893,13 +1942,11 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, if(error) break; if(!uivector_resize(&bitlen_cl, tree_cl.numcodes)) ERROR_BREAK(83 /*alloc fail*/); - for(i = 0; i != tree_cl.numcodes; ++i) - { - /*lenghts of code length tree is in the order as specified by deflate*/ + for(i = 0; i != tree_cl.numcodes; ++i) { + /*lengths of code length tree is in the order as specified by deflate*/ bitlen_cl.data[i] = HuffmanTree_getLength(&tree_cl, CLCL_ORDER[i]); } - while(bitlen_cl.data[bitlen_cl.size - 1] == 0 && bitlen_cl.size > 4) - { + while(bitlen_cl.data[bitlen_cl.size - 1] == 0 && bitlen_cl.size > 4) { /*remove zeros at the end, but minimum size must be 4*/ if(!uivector_resize(&bitlen_cl, bitlen_cl.size - 1)) ERROR_BREAK(83 /*alloc fail*/); } @@ -1911,7 +1958,7 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, After the BFINAL and BTYPE, the dynamic block consists out of the following: - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN - (HCLEN+4)*3 bits code lengths of code length alphabet - - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length + - HLIT + 257 code lengths of lit/length alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) - HDIST + 1 code lengths of distance alphabet (encoded using the code length alphabet, + possible repetition codes 16, 17, 18) @@ -1920,9 +1967,9 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, */ /*Write block type*/ - addBitToStream(bp, out, BFINAL); - addBitToStream(bp, out, 0); /*first bit of BTYPE "dynamic"*/ - addBitToStream(bp, out, 1); /*second bit of BTYPE "dynamic"*/ + writeBits(writer, BFINAL, 1); + writeBits(writer, 0, 1); /*first bit of BTYPE "dynamic"*/ + writeBits(writer, 1, 1); /*second bit of BTYPE "dynamic"*/ /*write the HLIT, HDIST and HCLEN values*/ HLIT = (unsigned)(numcodes_ll - 257); @@ -1930,31 +1977,30 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, HCLEN = (unsigned)bitlen_cl.size - 4; /*trim zeroes for HCLEN. HLIT and HDIST were already trimmed at tree creation*/ while(!bitlen_cl.data[HCLEN + 4 - 1] && HCLEN > 0) --HCLEN; - addBitsToStream(bp, out, HLIT, 5); - addBitsToStream(bp, out, HDIST, 5); - addBitsToStream(bp, out, HCLEN, 4); + writeBits(writer, HLIT, 5); + writeBits(writer, HDIST, 5); + writeBits(writer, HCLEN, 4); - /*write the code lenghts of the code length alphabet*/ - for(i = 0; i != HCLEN + 4; ++i) addBitsToStream(bp, out, bitlen_cl.data[i], 3); + /*write the code lengths of the code length alphabet*/ + for(i = 0; i != HCLEN + 4; ++i) writeBits(writer, bitlen_cl.data[i], 3); - /*write the lenghts of the lit/len AND the dist alphabet*/ - for(i = 0; i != bitlen_lld_e.size; ++i) - { - addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_cl, bitlen_lld_e.data[i]), - HuffmanTree_getLength(&tree_cl, bitlen_lld_e.data[i])); + /*write the lengths of the lit/len AND the dist alphabet*/ + for(i = 0; i != bitlen_lld_e.size; ++i) { + writeBitsReversed(writer, HuffmanTree_getCode(&tree_cl, bitlen_lld_e.data[i]), + HuffmanTree_getLength(&tree_cl, bitlen_lld_e.data[i])); /*extra bits of repeat codes*/ - if(bitlen_lld_e.data[i] == 16) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 2); - else if(bitlen_lld_e.data[i] == 17) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 3); - else if(bitlen_lld_e.data[i] == 18) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 7); + if(bitlen_lld_e.data[i] == 16) writeBits(writer, bitlen_lld_e.data[++i], 2); + else if(bitlen_lld_e.data[i] == 17) writeBits(writer, bitlen_lld_e.data[++i], 3); + else if(bitlen_lld_e.data[i] == 18) writeBits(writer, bitlen_lld_e.data[++i], 7); } /*write the compressed data symbols*/ - writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d); + writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d); /*error: the length of the end code 256 must be larger than 0*/ if(HuffmanTree_getLength(&tree_ll, 256) == 0) ERROR_BREAK(64); /*write the end code*/ - addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); + writeBitsReversed(writer, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); break; /*end of error-while*/ } @@ -1974,11 +2020,10 @@ static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, return error; } -static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash, +static unsigned deflateFixed(LodePNGBitWriter* writer, Hash* hash, const unsigned char* data, size_t datapos, size_t dataend, - const LodePNGCompressSettings* settings, unsigned final) -{ + const LodePNGCompressSettings* settings, unsigned final) { HuffmanTree tree_ll; /*tree for literal values and length codes*/ HuffmanTree tree_d; /*tree for distance codes*/ @@ -1992,28 +2037,24 @@ static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash, generateFixedLitLenTree(&tree_ll); generateFixedDistanceTree(&tree_d); - addBitToStream(bp, out, BFINAL); - addBitToStream(bp, out, 1); /*first bit of BTYPE*/ - addBitToStream(bp, out, 0); /*second bit of BTYPE*/ + writeBits(writer, BFINAL, 1); + writeBits(writer, 1, 1); /*first bit of BTYPE*/ + writeBits(writer, 0, 1); /*second bit of BTYPE*/ - if(settings->use_lz77) /*LZ77 encoded*/ - { + if(settings->use_lz77) /*LZ77 encoded*/ { uivector lz77_encoded; uivector_init(&lz77_encoded); error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, settings->minmatch, settings->nicematch, settings->lazymatching); - if(!error) writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d); + if(!error) writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d); uivector_cleanup(&lz77_encoded); - } - else /*no LZ77, but still will be Huffman compressed*/ - { - for(i = datapos; i < dataend; ++i) - { - addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i])); + } else /*no LZ77, but still will be Huffman compressed*/ { + for(i = datapos; i < dataend; ++i) { + writeBitsReversed(writer, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i])); } } /*add END code*/ - if(!error) addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); + if(!error) writeBitsReversed(writer, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); /*cleanup*/ HuffmanTree_cleanup(&tree_ll); @@ -2023,20 +2064,20 @@ static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash, } static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize, - const LodePNGCompressSettings* settings) -{ + const LodePNGCompressSettings* settings) { unsigned error = 0; size_t i, blocksize, numdeflateblocks; - size_t bp = 0; /*the bit pointer*/ Hash hash; + LodePNGBitWriter writer; + + LodePNGBitWriter_init(&writer, out); if(settings->btype > 2) return 61; else if(settings->btype == 0) return deflateNoCompression(out, in, insize); else if(settings->btype == 1) blocksize = insize; - else /*if(settings->btype == 2)*/ - { + else /*if(settings->btype == 2)*/ { /*on PNGs, deflate blocks of 65-262k seem to give most dense encoding*/ - blocksize = insize / 8 + 8; + blocksize = insize / 8u + 8; if(blocksize < 65536) blocksize = 65536; if(blocksize > 262144) blocksize = 262144; } @@ -2047,15 +2088,14 @@ static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t error = hash_init(&hash, settings->windowsize); if(error) return error; - for(i = 0; i != numdeflateblocks && !error; ++i) - { + for(i = 0; i != numdeflateblocks && !error; ++i) { unsigned final = (i == numdeflateblocks - 1); size_t start = i * blocksize; size_t end = start + blocksize; if(end > insize) end = insize; - if(settings->btype == 1) error = deflateFixed(out, &bp, &hash, in, start, end, settings, final); - else if(settings->btype == 2) error = deflateDynamic(out, &bp, &hash, in, start, end, settings, final); + if(settings->btype == 1) error = deflateFixed(&writer, &hash, in, start, end, settings, final); + else if(settings->btype == 2) error = deflateDynamic(&writer, &hash, in, start, end, settings, final); } hash_cleanup(&hash); @@ -2065,8 +2105,7 @@ static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t unsigned lodepng_deflate(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, - const LodePNGCompressSettings* settings) -{ + const LodePNGCompressSettings* settings) { unsigned error; ucvector v; ucvector_init_buffer(&v, *out, *outsize); @@ -2078,14 +2117,10 @@ unsigned lodepng_deflate(unsigned char** out, size_t* outsize, static unsigned deflate(unsigned char** out, size_t* outsize, const unsigned char* in, size_t insize, - const LodePNGCompressSettings* settings) -{ - if(settings->custom_deflate) - { + const LodePNGCompressSettings* settings) { + if(settings->custom_deflate) { return settings->custom_deflate(out, outsize, in, insize, settings); - } - else - { + } else { return lodepng_deflate(out, outsize, in, insize, settings); } } @@ -2093,36 +2128,32 @@ static unsigned deflate(unsigned char** out, size_t* outsize, #endif /*LODEPNG_COMPILE_DECODER*/ /* ////////////////////////////////////////////////////////////////////////// */ -/* / Adler32 */ +/* / Adler32 / */ /* ////////////////////////////////////////////////////////////////////////// */ -static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) -{ - unsigned s1 = adler & 0xffff; - unsigned s2 = (adler >> 16) & 0xffff; +static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) { + unsigned s1 = adler & 0xffffu; + unsigned s2 = (adler >> 16u) & 0xffffu; - while(len > 0) - { + while(len != 0u) { + unsigned i; /*at least 5552 sums can be done before the sums overflow, saving a lot of module divisions*/ - unsigned amount = len > 5552 ? 5552 : len; + unsigned amount = len > 5552u ? 5552u : len; len -= amount; - while(amount > 0) - { + for(i = 0; i != amount; ++i) { s1 += (*data++); s2 += s1; - --amount; } - s1 %= 65521; - s2 %= 65521; + s1 %= 65521u; + s2 %= 65521u; } - return (s2 << 16) | s1; + return (s2 << 16u) | s1; } /*Return the adler32 of the bytes data[0..len-1]*/ -static unsigned adler32(const unsigned char* data, unsigned len) -{ - return update_adler32(1L, data, len); +static unsigned adler32(const unsigned char* data, unsigned len) { + return update_adler32(1u, data, len); } /* ////////////////////////////////////////////////////////////////////////// */ @@ -2132,15 +2163,13 @@ static unsigned adler32(const unsigned char* data, unsigned len) #ifdef LODEPNG_COMPILE_DECODER unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGDecompressSettings* settings) -{ + size_t insize, const LodePNGDecompressSettings* settings) { unsigned error = 0; unsigned CM, CINFO, FDICT; if(insize < 2) return 53; /*error, size of zlib data too small*/ /*read information from zlib header*/ - if((in[0] * 256 + in[1]) % 31 != 0) - { + if((in[0] * 256 + in[1]) % 31 != 0) { /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ return 24; } @@ -2151,13 +2180,11 @@ unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const uns FDICT = (in[1] >> 5) & 1; /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/ - if(CM != 8 || CINFO > 7) - { + if(CM != 8 || CINFO > 7) { /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ return 25; } - if(FDICT != 0) - { + if(FDICT != 0) { /*error: the specification of PNG says about the zlib stream: "The additional flags shall not specify a preset dictionary."*/ return 26; @@ -2166,8 +2193,7 @@ unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const uns error = inflate(out, outsize, in + 2, insize - 2, settings); if(error) return error; - if(!settings->ignore_adler32) - { + if(!settings->ignore_adler32) { unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]); unsigned checksum = adler32(*out, (unsigned)(*outsize)); if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/ @@ -2177,14 +2203,10 @@ unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const uns } static unsigned zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGDecompressSettings* settings) -{ - if(settings->custom_zlib) - { + size_t insize, const LodePNGDecompressSettings* settings) { + if(settings->custom_zlib) { return settings->custom_zlib(out, outsize, in, insize, settings); - } - else - { + } else { return lodepng_zlib_decompress(out, outsize, in, insize, settings); } } @@ -2194,56 +2216,48 @@ static unsigned zlib_decompress(unsigned char** out, size_t* outsize, const unsi #ifdef LODEPNG_COMPILE_ENCODER unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGCompressSettings* settings) -{ - /*initially, *out must be NULL and outsize 0, if you just give some random *out - that's pointing to a non allocated buffer, this'll crash*/ - ucvector outv; + size_t insize, const LodePNGCompressSettings* settings) { size_t i; unsigned error; unsigned char* deflatedata = 0; size_t deflatesize = 0; - /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ - unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ - unsigned FLEVEL = 0; - unsigned FDICT = 0; - unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; - unsigned FCHECK = 31 - CMFFLG % 31; - CMFFLG += FCHECK; - - /*ucvector-controlled version of the output buffer, for dynamic array*/ - ucvector_init_buffer(&outv, *out, *outsize); - - ucvector_push_back(&outv, (unsigned char)(CMFFLG >> 8)); - ucvector_push_back(&outv, (unsigned char)(CMFFLG & 255)); - error = deflate(&deflatedata, &deflatesize, in, insize, settings); - if(!error) - { - unsigned ADLER32 = adler32(in, (unsigned)insize); - for(i = 0; i != deflatesize; ++i) ucvector_push_back(&outv, deflatedata[i]); - lodepng_free(deflatedata); - lodepng_add32bitInt(&outv, ADLER32); + *out = NULL; + *outsize = 0; + if(!error) { + *outsize = deflatesize + 6; + *out = (unsigned char*)lodepng_malloc(*outsize); + if(!out) error = 83; /*alloc fail*/ } - *out = outv.data; - *outsize = outv.size; + if(!error) { + unsigned ADLER32 = adler32(in, (unsigned)insize); + /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ + unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ + unsigned FLEVEL = 0; + unsigned FDICT = 0; + unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; + unsigned FCHECK = 31 - CMFFLG % 31; + CMFFLG += FCHECK; + (*out)[0] = (unsigned char)(CMFFLG >> 8); + (*out)[1] = (unsigned char)(CMFFLG & 255); + for(i = 0; i != deflatesize; ++i) (*out)[i + 2] = deflatedata[i]; + lodepng_set32bitInt(&(*out)[*outsize - 4], ADLER32); + } + + lodepng_free(deflatedata); return error; } /* compress using the default or custom zlib function */ static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGCompressSettings* settings) -{ - if(settings->custom_zlib) - { + size_t insize, const LodePNGCompressSettings* settings) { + if(settings->custom_zlib) { return settings->custom_zlib(out, outsize, in, insize, settings); - } - else - { + } else { return lodepng_zlib_compress(out, outsize, in, insize, settings); } } @@ -2254,16 +2268,14 @@ static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsign #ifdef LODEPNG_COMPILE_DECODER static unsigned zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGDecompressSettings* settings) -{ + size_t insize, const LodePNGDecompressSettings* settings) { if(!settings->custom_zlib) return 87; /*no custom zlib function provided */ return settings->custom_zlib(out, outsize, in, insize, settings); } #endif /*LODEPNG_COMPILE_DECODER*/ #ifdef LODEPNG_COMPILE_ENCODER static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, - size_t insize, const LodePNGCompressSettings* settings) -{ + size_t insize, const LodePNGCompressSettings* settings) { if(!settings->custom_zlib) return 87; /*no custom zlib function provided */ return settings->custom_zlib(out, outsize, in, insize, settings); } @@ -2278,8 +2290,7 @@ static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsign /*this is a good tradeoff between speed and compression ratio*/ #define DEFAULT_WINDOWSIZE 2048 -void lodepng_compress_settings_init(LodePNGCompressSettings* settings) -{ +void lodepng_compress_settings_init(LodePNGCompressSettings* settings) { /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/ settings->btype = 2; settings->use_lz77 = 1; @@ -2300,16 +2311,16 @@ const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT #ifdef LODEPNG_COMPILE_DECODER -void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) -{ +void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) { settings->ignore_adler32 = 0; + settings->ignore_nlen = 0; settings->custom_zlib = 0; settings->custom_inflate = 0; settings->custom_context = 0; } -const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0}; +const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0, 0}; #endif /*LODEPNG_COMPILE_DECODER*/ @@ -2364,13 +2375,11 @@ static unsigned lodepng_crc32_table[256] = { }; /*Return the CRC of the bytes buf[0..len-1].*/ -unsigned lodepng_crc32(const unsigned char* data, size_t length) -{ +unsigned lodepng_crc32(const unsigned char* data, size_t length) { unsigned r = 0xffffffffu; size_t i; - for(i = 0; i < length; ++i) - { - r = lodepng_crc32_table[(r ^ data[i]) & 0xff] ^ (r >> 8); + for(i = 0; i < length; ++i) { + r = lodepng_crc32_table[(r ^ data[i]) & 0xffu] ^ (r >> 8u); } return r ^ 0xffffffffu; } @@ -2379,43 +2388,30 @@ unsigned lodepng_crc32(const unsigned char* data, size_t length); #endif /* !LODEPNG_NO_COMPILE_CRC */ /* ////////////////////////////////////////////////////////////////////////// */ -/* / Reading and writing single bits and bytes from/to stream for LodePNG / */ +/* / Reading and writing PNG color channel bits / */ /* ////////////////////////////////////////////////////////////////////////// */ -static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) -{ +/* The color channel bits of less-than-8-bit pixels are read with the MSB of bytes first, +so LodePNGBitWriter and LodePNGBitReader can't be used for those. */ + +static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) { unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); ++(*bitpointer); return result; } -static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) -{ +/* TODO: make this faster */ +static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) { unsigned result = 0; size_t i; - for(i = 0 ; i < nbits; ++i) - { + for(i = 0 ; i < nbits; ++i) { result <<= 1; result |= (unsigned)readBitFromReversedStream(bitpointer, bitstream); } return result; } -#ifdef LODEPNG_COMPILE_DECODER -static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) -{ - /*the current bit in bitstream must be 0 for this to work*/ - if(bit) - { - /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ - bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7))); - } - ++(*bitpointer); -} -#endif /*LODEPNG_COMPILE_DECODER*/ - -static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) -{ +static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) { /*the current bit in bitstream may be 0 or 1 for this to work*/ if(bit == 0) bitstream[(*bitpointer) >> 3] &= (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7)))); else bitstream[(*bitpointer) >> 3] |= (1 << (7 - ((*bitpointer) & 0x7))); @@ -2426,51 +2422,42 @@ static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, /* / PNG chunks / */ /* ////////////////////////////////////////////////////////////////////////// */ -unsigned lodepng_chunk_length(const unsigned char* chunk) -{ +unsigned lodepng_chunk_length(const unsigned char* chunk) { return lodepng_read32bitInt(&chunk[0]); } -void lodepng_chunk_type(char type[5], const unsigned char* chunk) -{ +void lodepng_chunk_type(char type[5], const unsigned char* chunk) { unsigned i; for(i = 0; i != 4; ++i) type[i] = (char)chunk[4 + i]; type[4] = 0; /*null termination char*/ } -unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) -{ - if(strlen(type) != 4) return 0; +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) { + if(lodepng_strlen(type) != 4) return 0; return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); } -unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) -{ +unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) { return((chunk[4] & 32) != 0); } -unsigned char lodepng_chunk_private(const unsigned char* chunk) -{ +unsigned char lodepng_chunk_private(const unsigned char* chunk) { return((chunk[6] & 32) != 0); } -unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk) -{ +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk) { return((chunk[7] & 32) != 0); } -unsigned char* lodepng_chunk_data(unsigned char* chunk) -{ +unsigned char* lodepng_chunk_data(unsigned char* chunk) { return &chunk[8]; } -const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) -{ +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) { return &chunk[8]; } -unsigned lodepng_chunk_check_crc(const unsigned char* chunk) -{ +unsigned lodepng_chunk_check_crc(const unsigned char* chunk) { unsigned length = lodepng_chunk_length(chunk); unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]); /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ @@ -2479,27 +2466,51 @@ unsigned lodepng_chunk_check_crc(const unsigned char* chunk) else return 0; } -void lodepng_chunk_generate_crc(unsigned char* chunk) -{ +void lodepng_chunk_generate_crc(unsigned char* chunk) { unsigned length = lodepng_chunk_length(chunk); unsigned CRC = lodepng_crc32(&chunk[4], length + 4); lodepng_set32bitInt(chunk + 8 + length, CRC); } -unsigned char* lodepng_chunk_next(unsigned char* chunk) -{ - unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; - return &chunk[total_chunk_length]; +unsigned char* lodepng_chunk_next(unsigned char* chunk) { + if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47 + && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) { + /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */ + return chunk + 8; + } else { + unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; + return chunk + total_chunk_length; + } } -const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk) -{ - unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; - return &chunk[total_chunk_length]; +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk) { + if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47 + && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) { + /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */ + return chunk + 8; + } else { + unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; + return chunk + total_chunk_length; + } } -unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk) -{ +unsigned char* lodepng_chunk_find(unsigned char* chunk, const unsigned char* end, const char type[5]) { + for(;;) { + if(chunk + 12 >= end) return 0; + if(lodepng_chunk_type_equals(chunk, type)) return chunk; + chunk = lodepng_chunk_next(chunk); + } +} + +const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]) { + for(;;) { + if(chunk + 12 >= end) return 0; + if(lodepng_chunk_type_equals(chunk, type)) return chunk; + chunk = lodepng_chunk_next_const(chunk); + } +} + +unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk) { unsigned i; unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; unsigned char *chunk_start, *new_buffer; @@ -2518,8 +2529,7 @@ unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsi } unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, - const char* type, const unsigned char* data) -{ + const char* type, const unsigned char* data) { unsigned i; unsigned char *chunk, *new_buffer; size_t new_length = (*outlength) + length + 12; @@ -2549,47 +2559,42 @@ unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned l } /* ////////////////////////////////////////////////////////////////////////// */ -/* / Color types and such / */ +/* / Color types, channels, bits / */ /* ////////////////////////////////////////////////////////////////////////// */ -/*return type is a LodePNG error code*/ -static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) /*bd = bitdepth*/ -{ - switch(colortype) - { - case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/ - case 2: if(!( bd == 8 || bd == 16)) return 37; break; /*RGB*/ - case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; /*palette*/ - case 4: if(!( bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/ - case 6: if(!( bd == 8 || bd == 16)) return 37; break; /*RGBA*/ - default: return 31; +/*checks if the colortype is valid and the bitdepth bd is allowed for this colortype. +Return value is a LodePNG error code.*/ +static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) { + switch(colortype) { + case LCT_GREY: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; + case LCT_RGB: if(!( bd == 8 || bd == 16)) return 37; break; + case LCT_PALETTE: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; + case LCT_GREY_ALPHA: if(!( bd == 8 || bd == 16)) return 37; break; + case LCT_RGBA: if(!( bd == 8 || bd == 16)) return 37; break; + default: return 31; /* invalid color type */ } return 0; /*allowed color type / bits combination*/ } -static unsigned getNumColorChannels(LodePNGColorType colortype) -{ - switch(colortype) - { - case 0: return 1; /*grey*/ - case 2: return 3; /*RGB*/ - case 3: return 1; /*palette*/ - case 4: return 2; /*grey + alpha*/ - case 6: return 4; /*RGBA*/ +static unsigned getNumColorChannels(LodePNGColorType colortype) { + switch(colortype) { + case LCT_GREY: return 1; + case LCT_RGB: return 3; + case LCT_PALETTE: return 1; + case LCT_GREY_ALPHA: return 2; + case LCT_RGBA: return 4; + default: return 0; /*invalid color type*/ } - return 0; /*unexisting color type*/ } -static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) -{ +static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) { /*bits per pixel is amount of channels * bits per channel*/ return getNumColorChannels(colortype) * bitdepth; } /* ////////////////////////////////////////////////////////////////////////// */ -void lodepng_color_mode_init(LodePNGColorMode* info) -{ +void lodepng_color_mode_init(LodePNGColorMode* info) { info->key_defined = 0; info->key_r = info->key_g = info->key_b = 0; info->colortype = LCT_RGBA; @@ -2598,18 +2603,31 @@ void lodepng_color_mode_init(LodePNGColorMode* info) info->palettesize = 0; } -void lodepng_color_mode_cleanup(LodePNGColorMode* info) -{ +void lodepng_color_mode_alloc_palette(LodePNGColorMode* info) { + size_t i; + /*room for 256 colors with 4 bytes each. Using realloc to avoid leak if it is being overwritten*/ + info->palette = (unsigned char*)lodepng_realloc(info->palette, 1024); + if(!info->palette) return; /*alloc fail*/ + for(i = 0; i != 256; ++i) { + /*Initialize all unused colors with black, the value used for invalid palette indices. + This is an error according to the PNG spec, but common PNG decoders make it black instead. + That makes color conversion slightly faster due to no error handling needed.*/ + info->palette[i * 4 + 0] = 0; + info->palette[i * 4 + 1] = 0; + info->palette[i * 4 + 2] = 0; + info->palette[i * 4 + 3] = 255; + } +} + +void lodepng_color_mode_cleanup(LodePNGColorMode* info) { lodepng_palette_clear(info); } -unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) -{ +unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) { size_t i; lodepng_color_mode_cleanup(dest); *dest = *source; - if(source->palette) - { + if(source->palette) { dest->palette = (unsigned char*)lodepng_malloc(1024); if(!dest->palette && source->palettesize) return 83; /*alloc fail*/ for(i = 0; i != source->palettesize * 4; ++i) dest->palette[i] = source->palette[i]; @@ -2617,45 +2635,42 @@ unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* return 0; } -static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) -{ +LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth) { + LodePNGColorMode result; + lodepng_color_mode_init(&result); + result.colortype = colortype; + result.bitdepth = bitdepth; + return result; +} + +static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) { size_t i; if(a->colortype != b->colortype) return 0; if(a->bitdepth != b->bitdepth) return 0; if(a->key_defined != b->key_defined) return 0; - if(a->key_defined) - { + if(a->key_defined) { if(a->key_r != b->key_r) return 0; if(a->key_g != b->key_g) return 0; if(a->key_b != b->key_b) return 0; } if(a->palettesize != b->palettesize) return 0; - for(i = 0; i != a->palettesize * 4; ++i) - { + for(i = 0; i != a->palettesize * 4; ++i) { if(a->palette[i] != b->palette[i]) return 0; } return 1; } -void lodepng_palette_clear(LodePNGColorMode* info) -{ +void lodepng_palette_clear(LodePNGColorMode* info) { if(info->palette) lodepng_free(info->palette); info->palette = 0; info->palettesize = 0; } unsigned lodepng_palette_add(LodePNGColorMode* info, - unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - unsigned char* data; - /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with - the max of 256 colors, it'll have the exact alloc size*/ - if(!info->palette) /*allocate palette if empty*/ - { - /*room for 256 colors with 4 bytes each*/ - data = (unsigned char*)lodepng_realloc(info->palette, 1024); - if(!data) return 83; /*alloc fail*/ - else info->palette = data; + unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + if(!info->palette) /*allocate palette if empty*/ { + lodepng_color_mode_alloc_palette(info); + if(!info->palette) return 83; /*alloc fail*/ } info->palette[4 * info->palettesize + 0] = r; info->palette[4 * info->palettesize + 1] = g; @@ -2665,58 +2680,48 @@ unsigned lodepng_palette_add(LodePNGColorMode* info, return 0; } -unsigned lodepng_get_bpp(const LodePNGColorMode* info) -{ - /*calculate bits per pixel out of colortype and bitdepth*/ +/*calculate bits per pixel out of colortype and bitdepth*/ +unsigned lodepng_get_bpp(const LodePNGColorMode* info) { return lodepng_get_bpp_lct(info->colortype, info->bitdepth); } -unsigned lodepng_get_channels(const LodePNGColorMode* info) -{ +unsigned lodepng_get_channels(const LodePNGColorMode* info) { return getNumColorChannels(info->colortype); } -unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info) -{ +unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info) { return info->colortype == LCT_GREY || info->colortype == LCT_GREY_ALPHA; } -unsigned lodepng_is_alpha_type(const LodePNGColorMode* info) -{ +unsigned lodepng_is_alpha_type(const LodePNGColorMode* info) { return (info->colortype & 4) != 0; /*4 or 6*/ } -unsigned lodepng_is_palette_type(const LodePNGColorMode* info) -{ +unsigned lodepng_is_palette_type(const LodePNGColorMode* info) { return info->colortype == LCT_PALETTE; } -unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info) -{ +unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info) { size_t i; - for(i = 0; i != info->palettesize; ++i) - { + for(i = 0; i != info->palettesize; ++i) { if(info->palette[i * 4 + 3] < 255) return 1; } return 0; } -unsigned lodepng_can_have_alpha(const LodePNGColorMode* info) -{ +unsigned lodepng_can_have_alpha(const LodePNGColorMode* info) { return info->key_defined || lodepng_is_alpha_type(info) || lodepng_has_palette_alpha(info); } -size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) -{ +static size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) { size_t bpp = lodepng_get_bpp_lct(colortype, bitdepth); size_t n = (size_t)w * (size_t)h; - return ((n / 8) * bpp) + ((n & 7) * bpp + 7) / 8; + return ((n / 8u) * bpp) + ((n & 7u) * bpp + 7u) / 8u; } -size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) -{ +size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) { return lodepng_get_raw_size_lct(w, h, color->colortype, color->bitdepth); } @@ -2727,30 +2732,13 @@ size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* colo /*in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer, and in addition has one extra byte per line: the filter byte. So this gives a larger result than lodepng_get_raw_size. */ -static size_t lodepng_get_raw_size_idat(unsigned w, unsigned h, const LodePNGColorMode* color) -{ +static size_t lodepng_get_raw_size_idat(unsigned w, unsigned h, const LodePNGColorMode* color) { size_t bpp = lodepng_get_bpp(color); /* + 1 for the filter byte, and possibly plus padding bits per line */ - size_t line = ((size_t)(w / 8) * bpp) + 1 + ((w & 7) * bpp + 7) / 8; + size_t line = ((size_t)(w / 8u) * bpp) + 1u + ((w & 7u) * bpp + 7u) / 8u; return (size_t)h * line; } -/* Safely check if multiplying two integers will overflow (no undefined -behavior, compiler removing the code, etc...) and output result. */ -static int lodepng_mulofl(size_t a, size_t b, size_t* result) -{ - *result = a * b; /* Unsigned multiplication is well defined and safe in C90 */ - return (a != 0 && *result / a != b); -} - -/* Safely check if adding two integers will overflow (no undefined -behavior, compiler removing the code, etc...) and output result. */ -static int lodepng_addofl(size_t a, size_t b, size_t* result) -{ - *result = a + b; /* Unsigned addition is well defined and safe in C90 */ - return *result < a; -} - /*Safely checks whether size_t overflow can be caused due to amount of pixels. This check is overcautious rather than precise. If this check indicates no overflow, you can safely compute in a size_t (but not an unsigned): @@ -2760,8 +2748,7 @@ you can safely compute in a size_t (but not an unsigned): Returns 1 if overflow possible, 0 if not. */ static int lodepng_pixel_overflow(unsigned w, unsigned h, - const LodePNGColorMode* pngcolor, const LodePNGColorMode* rawcolor) -{ + const LodePNGColorMode* pngcolor, const LodePNGColorMode* rawcolor) { size_t bpp = LODEPNG_MAX(lodepng_get_bpp(pngcolor), lodepng_get_bpp(rawcolor)); size_t numpixels, total; size_t line; /* bytes per line in worst case */ @@ -2769,9 +2756,9 @@ static int lodepng_pixel_overflow(unsigned w, unsigned h, if(lodepng_mulofl((size_t)w, (size_t)h, &numpixels)) return 1; if(lodepng_mulofl(numpixels, 8, &total)) return 1; /* bit pointer with 8-bit color, or 8 bytes per channel color */ - /* Bytes per scanline with the expression "(w / 8) * bpp) + ((w & 7) * bpp + 7) / 8" */ - if(lodepng_mulofl((size_t)(w / 8), bpp, &line)) return 1; - if(lodepng_addofl(line, ((w & 7) * bpp + 7) / 8, &line)) return 1; + /* Bytes per scanline with the expression "(w / 8u) * bpp) + ((w & 7u) * bpp + 7u) / 8u" */ + if(lodepng_mulofl((size_t)(w / 8u), bpp, &line)) return 1; + if(lodepng_addofl(line, ((w & 7u) * bpp + 7u) / 8u, &line)) return 1; if(lodepng_addofl(line, 5, &line)) return 1; /* 5 bytes overhead per line: 1 filterbyte, 4 for Adam7 worst case */ if(lodepng_mulofl(line, h, &total)) return 1; /* Total bytes in worst case */ @@ -2783,33 +2770,28 @@ static int lodepng_pixel_overflow(unsigned w, unsigned h, #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -static void LodePNGUnknownChunks_init(LodePNGInfo* info) -{ +static void LodePNGUnknownChunks_init(LodePNGInfo* info) { unsigned i; for(i = 0; i != 3; ++i) info->unknown_chunks_data[i] = 0; for(i = 0; i != 3; ++i) info->unknown_chunks_size[i] = 0; } -static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info) -{ +static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info) { unsigned i; for(i = 0; i != 3; ++i) lodepng_free(info->unknown_chunks_data[i]); } -static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src) -{ +static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src) { unsigned i; LodePNGUnknownChunks_cleanup(dest); - for(i = 0; i != 3; ++i) - { + for(i = 0; i != 3; ++i) { size_t j; dest->unknown_chunks_size[i] = src->unknown_chunks_size[i]; dest->unknown_chunks_data[i] = (unsigned char*)lodepng_malloc(src->unknown_chunks_size[i]); if(!dest->unknown_chunks_data[i] && dest->unknown_chunks_size[i]) return 83; /*alloc fail*/ - for(j = 0; j < src->unknown_chunks_size[i]; ++j) - { + for(j = 0; j < src->unknown_chunks_size[i]; ++j) { dest->unknown_chunks_data[i][j] = src->unknown_chunks_data[i][j]; } } @@ -2819,18 +2801,15 @@ static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* /******************************************************************************/ -static void LodePNGText_init(LodePNGInfo* info) -{ +static void LodePNGText_init(LodePNGInfo* info) { info->text_num = 0; info->text_keys = NULL; info->text_strings = NULL; } -static void LodePNGText_cleanup(LodePNGInfo* info) -{ +static void LodePNGText_cleanup(LodePNGInfo* info) { size_t i; - for(i = 0; i != info->text_num; ++i) - { + for(i = 0; i != info->text_num; ++i) { string_cleanup(&info->text_keys[i]); string_cleanup(&info->text_strings[i]); } @@ -2838,30 +2817,25 @@ static void LodePNGText_cleanup(LodePNGInfo* info) lodepng_free(info->text_strings); } -static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source) -{ +static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source) { size_t i = 0; dest->text_keys = 0; dest->text_strings = 0; dest->text_num = 0; - for(i = 0; i != source->text_num; ++i) - { + for(i = 0; i != source->text_num; ++i) { CERROR_TRY_RETURN(lodepng_add_text(dest, source->text_keys[i], source->text_strings[i])); } return 0; } -void lodepng_clear_text(LodePNGInfo* info) -{ +void lodepng_clear_text(LodePNGInfo* info) { LodePNGText_cleanup(info); } -unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) -{ +unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) { char** new_keys = (char**)(lodepng_realloc(info->text_keys, sizeof(char*) * (info->text_num + 1))); char** new_strings = (char**)(lodepng_realloc(info->text_strings, sizeof(char*) * (info->text_num + 1))); - if(!new_keys || !new_strings) - { + if(!new_keys || !new_strings) { lodepng_free(new_keys); lodepng_free(new_strings); return 83; /*alloc fail*/ @@ -2871,19 +2845,15 @@ unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) info->text_keys = new_keys; info->text_strings = new_strings; - string_init(&info->text_keys[info->text_num - 1]); - string_set(&info->text_keys[info->text_num - 1], key); - - string_init(&info->text_strings[info->text_num - 1]); - string_set(&info->text_strings[info->text_num - 1], str); + info->text_keys[info->text_num - 1] = alloc_string(key); + info->text_strings[info->text_num - 1] = alloc_string(str); return 0; } /******************************************************************************/ -static void LodePNGIText_init(LodePNGInfo* info) -{ +static void LodePNGIText_init(LodePNGInfo* info) { info->itext_num = 0; info->itext_keys = NULL; info->itext_langtags = NULL; @@ -2891,11 +2861,9 @@ static void LodePNGIText_init(LodePNGInfo* info) info->itext_strings = NULL; } -static void LodePNGIText_cleanup(LodePNGInfo* info) -{ +static void LodePNGIText_cleanup(LodePNGInfo* info) { size_t i; - for(i = 0; i != info->itext_num; ++i) - { + for(i = 0; i != info->itext_num; ++i) { string_cleanup(&info->itext_keys[i]); string_cleanup(&info->itext_langtags[i]); string_cleanup(&info->itext_transkeys[i]); @@ -2907,36 +2875,31 @@ static void LodePNGIText_cleanup(LodePNGInfo* info) lodepng_free(info->itext_strings); } -static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source) -{ +static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source) { size_t i = 0; dest->itext_keys = 0; dest->itext_langtags = 0; dest->itext_transkeys = 0; dest->itext_strings = 0; dest->itext_num = 0; - for(i = 0; i != source->itext_num; ++i) - { + for(i = 0; i != source->itext_num; ++i) { CERROR_TRY_RETURN(lodepng_add_itext(dest, source->itext_keys[i], source->itext_langtags[i], source->itext_transkeys[i], source->itext_strings[i])); } return 0; } -void lodepng_clear_itext(LodePNGInfo* info) -{ +void lodepng_clear_itext(LodePNGInfo* info) { LodePNGIText_cleanup(info); } unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, - const char* transkey, const char* str) -{ + const char* transkey, const char* str) { char** new_keys = (char**)(lodepng_realloc(info->itext_keys, sizeof(char*) * (info->itext_num + 1))); char** new_langtags = (char**)(lodepng_realloc(info->itext_langtags, sizeof(char*) * (info->itext_num + 1))); char** new_transkeys = (char**)(lodepng_realloc(info->itext_transkeys, sizeof(char*) * (info->itext_num + 1))); char** new_strings = (char**)(lodepng_realloc(info->itext_strings, sizeof(char*) * (info->itext_num + 1))); - if(!new_keys || !new_langtags || !new_transkeys || !new_strings) - { + if(!new_keys || !new_langtags || !new_transkeys || !new_strings) { lodepng_free(new_keys); lodepng_free(new_langtags); lodepng_free(new_transkeys); @@ -2950,24 +2913,46 @@ unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langt info->itext_transkeys = new_transkeys; info->itext_strings = new_strings; - string_init(&info->itext_keys[info->itext_num - 1]); - string_set(&info->itext_keys[info->itext_num - 1], key); - - string_init(&info->itext_langtags[info->itext_num - 1]); - string_set(&info->itext_langtags[info->itext_num - 1], langtag); - - string_init(&info->itext_transkeys[info->itext_num - 1]); - string_set(&info->itext_transkeys[info->itext_num - 1], transkey); - - string_init(&info->itext_strings[info->itext_num - 1]); - string_set(&info->itext_strings[info->itext_num - 1], str); + info->itext_keys[info->itext_num - 1] = alloc_string(key); + info->itext_langtags[info->itext_num - 1] = alloc_string(langtag); + info->itext_transkeys[info->itext_num - 1] = alloc_string(transkey); + info->itext_strings[info->itext_num - 1] = alloc_string(str); return 0; } + +/* same as set but does not delete */ +static unsigned lodepng_assign_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) { + if(profile_size == 0) return 100; /*invalid ICC profile size*/ + + info->iccp_name = alloc_string(name); + info->iccp_profile = (unsigned char*)lodepng_malloc(profile_size); + + if(!info->iccp_name || !info->iccp_profile) return 83; /*alloc fail*/ + + lodepng_memcpy(info->iccp_profile, profile, profile_size); + info->iccp_profile_size = profile_size; + + return 0; /*ok*/ +} + +unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) { + if(info->iccp_name) lodepng_clear_icc(info); + info->iccp_defined = 1; + + return lodepng_assign_icc(info, name, profile, profile_size); +} + +void lodepng_clear_icc(LodePNGInfo* info) { + string_cleanup(&info->iccp_name); + lodepng_free(info->iccp_profile); + info->iccp_profile = NULL; + info->iccp_profile_size = 0; + info->iccp_defined = 0; +} #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -void lodepng_info_init(LodePNGInfo* info) -{ +void lodepng_info_init(LodePNGInfo* info) { lodepng_color_mode_init(&info->color); info->interlace_method = 0; info->compression_method = 0; @@ -2982,23 +2967,30 @@ void lodepng_info_init(LodePNGInfo* info) info->time_defined = 0; info->phys_defined = 0; + info->gama_defined = 0; + info->chrm_defined = 0; + info->srgb_defined = 0; + info->iccp_defined = 0; + info->iccp_name = NULL; + info->iccp_profile = NULL; + LodePNGUnknownChunks_init(info); #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ } -void lodepng_info_cleanup(LodePNGInfo* info) -{ +void lodepng_info_cleanup(LodePNGInfo* info) { lodepng_color_mode_cleanup(&info->color); #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS LodePNGText_cleanup(info); LodePNGIText_cleanup(info); + lodepng_clear_icc(info); + LodePNGUnknownChunks_cleanup(info); #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ } -unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) -{ +unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) { lodepng_info_cleanup(dest); *dest = *source; lodepng_color_mode_init(&dest->color); @@ -3007,6 +2999,9 @@ unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS CERROR_TRY_RETURN(LodePNGText_copy(dest, source)); CERROR_TRY_RETURN(LodePNGIText_copy(dest, source)); + if(source->iccp_defined) { + CERROR_TRY_RETURN(lodepng_assign_icc(dest, source->iccp_name, source->iccp_profile, source->iccp_profile_size)); + } LodePNGUnknownChunks_init(dest); CERROR_TRY_RETURN(LodePNGUnknownChunks_copy(dest, source)); @@ -3014,25 +3009,17 @@ unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) return 0; } -void lodepng_info_swap(LodePNGInfo* a, LodePNGInfo* b) -{ - LodePNGInfo temp = *a; - *a = *b; - *b = temp; -} - /* ////////////////////////////////////////////////////////////////////////// */ /*index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/ -static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) -{ +static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) { unsigned m = bits == 1 ? 7 : bits == 2 ? 3 : 1; /*8 / bits - 1*/ /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/ unsigned p = (unsigned)index & m; in &= (1u << bits) - 1u; /*filter out any other bits of the input value*/ in = in << (bits * (m - p)); - if(p == 0) out[index * bits / 8] = in; - else out[index * bits / 8] |= in; + if(p == 0) out[index * bits / 8u] = in; + else out[index * bits / 8u] |= in; } typedef struct ColorTree ColorTree; @@ -3043,26 +3030,21 @@ This is the data structure used to count the number of unique colors and to get index for a color. It's like an octree, but because the alpha channel is used too, each node has 16 instead of 8 children. */ -struct ColorTree -{ +struct ColorTree { ColorTree* children[16]; /*up to 16 pointers to ColorTree of next level*/ int index; /*the payload. Only has a meaningful value if this is in the last level*/ }; -static void color_tree_init(ColorTree* tree) -{ +static void color_tree_init(ColorTree* tree) { int i; for(i = 0; i != 16; ++i) tree->children[i] = 0; tree->index = -1; } -static void color_tree_cleanup(ColorTree* tree) -{ +static void color_tree_cleanup(ColorTree* tree) { int i; - for(i = 0; i != 16; ++i) - { - if(tree->children[i]) - { + for(i = 0; i != 16; ++i) { + if(tree->children[i]) { color_tree_cleanup(tree->children[i]); lodepng_free(tree->children[i]); } @@ -3070,11 +3052,9 @@ static void color_tree_cleanup(ColorTree* tree) } /*returns -1 if color not present, its index otherwise*/ -static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ +static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) { int bit = 0; - for(bit = 0; bit < 8; ++bit) - { + for(bit = 0; bit < 8; ++bit) { int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); if(!tree->children[i]) return -1; else tree = tree->children[i]; @@ -3083,8 +3063,7 @@ static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, uns } #ifdef LODEPNG_COMPILE_ENCODER -static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ +static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) { return color_tree_get(tree, r, g, b, a) >= 0; } #endif /*LODEPNG_COMPILE_ENCODER*/ @@ -3092,14 +3071,11 @@ static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, uns /*color is not allowed to already exist. Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist")*/ static void color_tree_add(ColorTree* tree, - unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned index) -{ + unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned index) { int bit; - for(bit = 0; bit < 8; ++bit) - { + for(bit = 0; bit < 8; ++bit) { int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); - if(!tree->children[i]) - { + if(!tree->children[i]) { tree->children[i] = (ColorTree*)lodepng_malloc(sizeof(ColorTree)); color_tree_init(tree->children[i]); } @@ -3111,67 +3087,47 @@ static void color_tree_add(ColorTree* tree, /*put a pixel, given its RGBA color, into image of any color type*/ static unsigned rgba8ToPixel(unsigned char* out, size_t i, const LodePNGColorMode* mode, ColorTree* tree /*for palette*/, - unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - if(mode->colortype == LCT_GREY) - { - unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/; - if(mode->bitdepth == 8) out[i] = grey; - else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = grey; - else - { - /*take the most significant bits of grey*/ - grey = (grey >> (8 - mode->bitdepth)) & ((1 << mode->bitdepth) - 1); - addColorBits(out, i, mode->bitdepth, grey); + unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + if(mode->colortype == LCT_GREY) { + unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ + if(mode->bitdepth == 8) out[i] = gray; + else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = gray; + else { + /*take the most significant bits of gray*/ + gray = (gray >> (8 - mode->bitdepth)) & ((1 << mode->bitdepth) - 1); + addColorBits(out, i, mode->bitdepth, gray); } - } - else if(mode->colortype == LCT_RGB) - { - if(mode->bitdepth == 8) - { + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { out[i * 3 + 0] = r; out[i * 3 + 1] = g; out[i * 3 + 2] = b; - } - else - { + } else { out[i * 6 + 0] = out[i * 6 + 1] = r; out[i * 6 + 2] = out[i * 6 + 3] = g; out[i * 6 + 4] = out[i * 6 + 5] = b; } - } - else if(mode->colortype == LCT_PALETTE) - { + } else if(mode->colortype == LCT_PALETTE) { int index = color_tree_get(tree, r, g, b, a); if(index < 0) return 82; /*color not in palette*/ if(mode->bitdepth == 8) out[i] = index; else addColorBits(out, i, mode->bitdepth, (unsigned)index); - } - else if(mode->colortype == LCT_GREY_ALPHA) - { - unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/; - if(mode->bitdepth == 8) - { - out[i * 2 + 0] = grey; + } else if(mode->colortype == LCT_GREY_ALPHA) { + unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ + if(mode->bitdepth == 8) { + out[i * 2 + 0] = gray; out[i * 2 + 1] = a; - } - else if(mode->bitdepth == 16) - { - out[i * 4 + 0] = out[i * 4 + 1] = grey; + } else if(mode->bitdepth == 16) { + out[i * 4 + 0] = out[i * 4 + 1] = gray; out[i * 4 + 2] = out[i * 4 + 3] = a; } - } - else if(mode->colortype == LCT_RGBA) - { - if(mode->bitdepth == 8) - { + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { out[i * 4 + 0] = r; out[i * 4 + 1] = g; out[i * 4 + 2] = b; out[i * 4 + 3] = a; - } - else - { + } else { out[i * 8 + 0] = out[i * 8 + 1] = r; out[i * 8 + 2] = out[i * 8 + 3] = g; out[i * 8 + 4] = out[i * 8 + 5] = b; @@ -3185,33 +3141,25 @@ static unsigned rgba8ToPixel(unsigned char* out, size_t i, /*put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/ static void rgba16ToPixel(unsigned char* out, size_t i, const LodePNGColorMode* mode, - unsigned short r, unsigned short g, unsigned short b, unsigned short a) -{ - if(mode->colortype == LCT_GREY) - { - unsigned short grey = r; /*((unsigned)r + g + b) / 3*/; - out[i * 2 + 0] = (grey >> 8) & 255; - out[i * 2 + 1] = grey & 255; - } - else if(mode->colortype == LCT_RGB) - { + unsigned short r, unsigned short g, unsigned short b, unsigned short a) { + if(mode->colortype == LCT_GREY) { + unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ + out[i * 2 + 0] = (gray >> 8) & 255; + out[i * 2 + 1] = gray & 255; + } else if(mode->colortype == LCT_RGB) { out[i * 6 + 0] = (r >> 8) & 255; out[i * 6 + 1] = r & 255; out[i * 6 + 2] = (g >> 8) & 255; out[i * 6 + 3] = g & 255; out[i * 6 + 4] = (b >> 8) & 255; out[i * 6 + 5] = b & 255; - } - else if(mode->colortype == LCT_GREY_ALPHA) - { - unsigned short grey = r; /*((unsigned)r + g + b) / 3*/; - out[i * 4 + 0] = (grey >> 8) & 255; - out[i * 4 + 1] = grey & 255; + } else if(mode->colortype == LCT_GREY_ALPHA) { + unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ + out[i * 4 + 0] = (gray >> 8) & 255; + out[i * 4 + 1] = gray & 255; out[i * 4 + 2] = (a >> 8) & 255; out[i * 4 + 3] = a & 255; - } - else if(mode->colortype == LCT_RGBA) - { + } else if(mode->colortype == LCT_RGBA) { out[i * 8 + 0] = (r >> 8) & 255; out[i * 8 + 1] = r & 255; out[i * 8 + 2] = (g >> 8) & 255; @@ -3227,24 +3175,17 @@ static void rgba16ToPixel(unsigned char* out, size_t i, static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, unsigned char* b, unsigned char* a, const unsigned char* in, size_t i, - const LodePNGColorMode* mode) -{ - if(mode->colortype == LCT_GREY) - { - if(mode->bitdepth == 8) - { + const LodePNGColorMode* mode) { + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { *r = *g = *b = in[i]; if(mode->key_defined && *r == mode->key_r) *a = 0; else *a = 255; - } - else if(mode->bitdepth == 16) - { + } else if(mode->bitdepth == 16) { *r = *g = *b = in[i * 2 + 0]; if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; else *a = 255; - } - else - { + } else { unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ size_t j = i * mode->bitdepth; unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); @@ -3252,17 +3193,12 @@ static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, if(mode->key_defined && value == mode->key_r) *a = 0; else *a = 255; } - } - else if(mode->colortype == LCT_RGB) - { - if(mode->bitdepth == 8) - { + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2]; if(mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0; else *a = 255; - } - else - { + } else { *r = in[i * 6 + 0]; *g = in[i * 6 + 2]; *b = in[i * 6 + 4]; @@ -3271,56 +3207,33 @@ static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; else *a = 255; } - } - else if(mode->colortype == LCT_PALETTE) - { + } else if(mode->colortype == LCT_PALETTE) { unsigned index; if(mode->bitdepth == 8) index = in[i]; - else - { + else { size_t j = i * mode->bitdepth; index = readBitsFromReversedStream(&j, in, mode->bitdepth); } - - if(index >= mode->palettesize) - { - /*This is an error according to the PNG spec, but common PNG decoders make it black instead. - Done here too, slightly faster due to no error handling needed.*/ - *r = *g = *b = 0; - *a = 255; - } - else - { - *r = mode->palette[index * 4 + 0]; - *g = mode->palette[index * 4 + 1]; - *b = mode->palette[index * 4 + 2]; - *a = mode->palette[index * 4 + 3]; - } - } - else if(mode->colortype == LCT_GREY_ALPHA) - { - if(mode->bitdepth == 8) - { + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + *r = mode->palette[index * 4 + 0]; + *g = mode->palette[index * 4 + 1]; + *b = mode->palette[index * 4 + 2]; + *a = mode->palette[index * 4 + 3]; + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { *r = *g = *b = in[i * 2 + 0]; *a = in[i * 2 + 1]; - } - else - { + } else { *r = *g = *b = in[i * 4 + 0]; *a = in[i * 4 + 2]; } - } - else if(mode->colortype == LCT_RGBA) - { - if(mode->bitdepth == 8) - { + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { *r = in[i * 4 + 0]; *g = in[i * 4 + 1]; *b = in[i * 4 + 2]; *a = in[i * 4 + 3]; - } - else - { + } else { *r = in[i * 8 + 0]; *g = in[i * 8 + 2]; *b = in[i * 8 + 4]; @@ -3331,136 +3244,171 @@ static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, /*Similar to getPixelColorRGBA8, but with all the for loops inside of the color mode test cases, optimized to convert the colors much faster, when converting -to RGBA or RGB with 8 bit per cannel. buffer must be RGBA or RGB output with -enough memory, if has_alpha is true the output is RGBA. mode has the color mode -of the input buffer.*/ -static void getPixelColorsRGBA8(unsigned char* buffer, size_t numpixels, - unsigned has_alpha, const unsigned char* in, - const LodePNGColorMode* mode) -{ - unsigned num_channels = has_alpha ? 4 : 3; +to the common case of RGBA with 8 bit per channel. buffer must be RGBA with +enough memory.*/ +static void getPixelColorsRGBA8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, + const unsigned char* LODEPNG_RESTRICT in, + const LodePNGColorMode* mode) { + unsigned num_channels = 4; size_t i; - if(mode->colortype == LCT_GREY) - { - if(mode->bitdepth == 8) - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = buffer[1] = buffer[2] = in[i]; - if(has_alpha) buffer[3] = mode->key_defined && in[i] == mode->key_r ? 0 : 255; + buffer[3] = 255; } - } - else if(mode->bitdepth == 16) - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + if(mode->key_defined) { + buffer -= numpixels * num_channels; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + if(buffer[0] == mode->key_r) buffer[3] = 0; + } + } + } else if(mode->bitdepth == 16) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = buffer[1] = buffer[2] = in[i * 2]; - if(has_alpha) buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255; + buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255; } - } - else - { + } else { unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ size_t j = 0; - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; - if(has_alpha) buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255; + buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255; } } - } - else if(mode->colortype == LCT_RGB) - { - if(mode->bitdepth == 8) - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { - buffer[0] = in[i * 3 + 0]; - buffer[1] = in[i * 3 + 1]; - buffer[2] = in[i * 3 + 2]; - if(has_alpha) buffer[3] = mode->key_defined && buffer[0] == mode->key_r - && buffer[1]== mode->key_g && buffer[2] == mode->key_b ? 0 : 255; + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + lodepng_memcpy(buffer, &in[i * 3], 3); + buffer[3] = 255; } - } - else - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + if(mode->key_defined) { + buffer -= numpixels * num_channels; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + if(buffer[0] == mode->key_r && buffer[1]== mode->key_g && buffer[2] == mode->key_b) buffer[3] = 0; + } + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = in[i * 6 + 0]; buffer[1] = in[i * 6 + 2]; buffer[2] = in[i * 6 + 4]; - if(has_alpha) buffer[3] = mode->key_defined + buffer[3] = mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b ? 0 : 255; } } - } - else if(mode->colortype == LCT_PALETTE) - { - unsigned index; - size_t j = 0; - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { - if(mode->bitdepth == 8) index = in[i]; - else index = readBitsFromReversedStream(&j, in, mode->bitdepth); - - if(index >= mode->palettesize) - { - /*This is an error according to the PNG spec, but most PNG decoders make it black instead. - Done here too, slightly faster due to no error handling needed.*/ - buffer[0] = buffer[1] = buffer[2] = 0; - if(has_alpha) buffer[3] = 255; + } else if(mode->colortype == LCT_PALETTE) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = in[i]; + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 4); } - else - { - buffer[0] = mode->palette[index * 4 + 0]; - buffer[1] = mode->palette[index * 4 + 1]; - buffer[2] = mode->palette[index * 4 + 2]; - if(has_alpha) buffer[3] = mode->palette[index * 4 + 3]; + } else { + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 4); } } - } - else if(mode->colortype == LCT_GREY_ALPHA) - { - if(mode->bitdepth == 8) - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; - if(has_alpha) buffer[3] = in[i * 2 + 1]; + buffer[3] = in[i * 2 + 1]; } - } - else - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; - if(has_alpha) buffer[3] = in[i * 4 + 2]; + buffer[3] = in[i * 4 + 2]; } } - } - else if(mode->colortype == LCT_RGBA) - { - if(mode->bitdepth == 8) - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { - buffer[0] = in[i * 4 + 0]; - buffer[1] = in[i * 4 + 1]; - buffer[2] = in[i * 4 + 2]; - if(has_alpha) buffer[3] = in[i * 4 + 3]; - } - } - else - { - for(i = 0; i != numpixels; ++i, buffer += num_channels) - { + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + lodepng_memcpy(buffer, in, numpixels * 4); + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 8 + 0]; + buffer[1] = in[i * 8 + 2]; + buffer[2] = in[i * 8 + 4]; + buffer[3] = in[i * 8 + 6]; + } + } + } +} + +/*Similar to getPixelColorsRGBA8, but with 3-channel RGB output.*/ +static void getPixelColorsRGB8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, + const unsigned char* LODEPNG_RESTRICT in, + const LodePNGColorMode* mode) { + const unsigned num_channels = 3; + size_t i; + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i]; + } + } else if(mode->bitdepth == 16) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2]; + } + } else { + unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); + buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; + } + } + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + lodepng_memcpy(buffer, in, numpixels * 3); + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 6 + 0]; + buffer[1] = in[i * 6 + 2]; + buffer[2] = in[i * 6 + 4]; + } + } + } else if(mode->colortype == LCT_PALETTE) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = in[i]; + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 3); + } + } else { + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 3); + } + } + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; + } + } + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + lodepng_memcpy(buffer, &in[i * 4], 3); + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { buffer[0] = in[i * 8 + 0]; buffer[1] = in[i * 8 + 2]; buffer[2] = in[i * 8 + 4]; - if(has_alpha) buffer[3] = in[i * 8 + 6]; } } } @@ -3469,16 +3417,12 @@ static void getPixelColorsRGBA8(unsigned char* buffer, size_t numpixels, /*Get RGBA16 color of pixel with index i (y * width + x) from the raw image with given color type, but the given color type must be 16-bit itself.*/ static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a, - const unsigned char* in, size_t i, const LodePNGColorMode* mode) -{ - if(mode->colortype == LCT_GREY) - { + const unsigned char* in, size_t i, const LodePNGColorMode* mode) { + if(mode->colortype == LCT_GREY) { *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1]; if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; else *a = 65535; - } - else if(mode->colortype == LCT_RGB) - { + } else if(mode->colortype == LCT_RGB) { *r = 256u * in[i * 6 + 0] + in[i * 6 + 1]; *g = 256u * in[i * 6 + 2] + in[i * 6 + 3]; *b = 256u * in[i * 6 + 4] + in[i * 6 + 5]; @@ -3487,14 +3431,10 @@ static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned s && 256u * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g && 256u * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; else *a = 65535; - } - else if(mode->colortype == LCT_GREY_ALPHA) - { + } else if(mode->colortype == LCT_GREY_ALPHA) { *r = *g = *b = 256u * in[i * 4 + 0] + in[i * 4 + 1]; *a = 256u * in[i * 4 + 2] + in[i * 4 + 3]; - } - else if(mode->colortype == LCT_RGBA) - { + } else if(mode->colortype == LCT_RGBA) { *r = 256u * in[i * 8 + 0] + in[i * 8 + 1]; *g = 256u * in[i * 8 + 2] + in[i * 8 + 3]; *b = 256u * in[i * 8 + 4] + in[i * 8 + 5]; @@ -3504,37 +3444,32 @@ static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned s unsigned lodepng_convert(unsigned char* out, const unsigned char* in, const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, - unsigned w, unsigned h) -{ + unsigned w, unsigned h) { size_t i; ColorTree tree; size_t numpixels = (size_t)w * (size_t)h; unsigned error = 0; - if(lodepng_color_mode_equal(mode_out, mode_in)) - { + if(lodepng_color_mode_equal(mode_out, mode_in)) { size_t numbytes = lodepng_get_raw_size(w, h, mode_in); for(i = 0; i != numbytes; ++i) out[i] = in[i]; return 0; } - if(mode_out->colortype == LCT_PALETTE) - { + if(mode_out->colortype == LCT_PALETTE) { size_t palettesize = mode_out->palettesize; const unsigned char* palette = mode_out->palette; size_t palsize = (size_t)1u << mode_out->bitdepth; /*if the user specified output palette but did not give the values, assume they want the values of the input color type (assuming that one is palette). Note that we never create a new palette ourselves.*/ - if(palettesize == 0) - { + if(palettesize == 0) { palettesize = mode_in->palettesize; palette = mode_in->palette; /*if the input was also palette with same bitdepth, then the color types are also equal, so copy literally. This to preserve the exact indices that were in the PNG even in case there are duplicate colors in the palette.*/ - if (mode_in->colortype == LCT_PALETTE && mode_in->bitdepth == mode_out->bitdepth) - { + if (mode_in->colortype == LCT_PALETTE && mode_in->bitdepth == mode_out->bitdepth) { size_t numbytes = lodepng_get_raw_size(w, h, mode_in); for(i = 0; i != numbytes; ++i) out[i] = in[i]; return 0; @@ -3542,64 +3477,113 @@ unsigned lodepng_convert(unsigned char* out, const unsigned char* in, } if(palettesize < palsize) palsize = palettesize; color_tree_init(&tree); - for(i = 0; i != palsize; ++i) - { + for(i = 0; i != palsize; ++i) { const unsigned char* p = &palette[i * 4]; color_tree_add(&tree, p[0], p[1], p[2], p[3], (unsigned)i); } } - if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16) - { - for(i = 0; i != numpixels; ++i) - { + if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16) { + for(i = 0; i != numpixels; ++i) { unsigned short r = 0, g = 0, b = 0, a = 0; getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); rgba16ToPixel(out, i, mode_out, r, g, b, a); } - } - else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) - { - getPixelColorsRGBA8(out, numpixels, 1, in, mode_in); - } - else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) - { - getPixelColorsRGBA8(out, numpixels, 0, in, mode_in); - } - else - { + } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) { + getPixelColorsRGBA8(out, numpixels, in, mode_in); + } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) { + getPixelColorsRGB8(out, numpixels, in, mode_in); + } else { unsigned char r = 0, g = 0, b = 0, a = 0; - for(i = 0; i != numpixels; ++i) - { + for(i = 0; i != numpixels; ++i) { getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a); if (error) break; } } - if(mode_out->colortype == LCT_PALETTE) - { + if(mode_out->colortype == LCT_PALETTE) { color_tree_cleanup(&tree); } return error; } + +/* Converts a single rgb color without alpha from one type to another, color bits truncated to +their bitdepth. In case of single channel (gray or palette), only the r channel is used. Slow +function, do not use to process all pixels of an image. Alpha channel not supported on purpose: +this is for bKGD, supporting alpha may prevent it from finding a color in the palette, from the +specification it looks like bKGD should ignore the alpha values of the palette since it can use +any palette index but doesn't have an alpha channel. Idem with ignoring color key. */ +unsigned lodepng_convert_rgb( + unsigned* r_out, unsigned* g_out, unsigned* b_out, + unsigned r_in, unsigned g_in, unsigned b_in, + const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in) { + unsigned r = 0, g = 0, b = 0; + unsigned mul = 65535 / ((1u << mode_in->bitdepth) - 1u); /*65535, 21845, 4369, 257, 1*/ + unsigned shift = 16 - mode_out->bitdepth; + + if(mode_in->colortype == LCT_GREY || mode_in->colortype == LCT_GREY_ALPHA) { + r = g = b = r_in * mul; + } else if(mode_in->colortype == LCT_RGB || mode_in->colortype == LCT_RGBA) { + r = r_in * mul; + g = g_in * mul; + b = b_in * mul; + } else if(mode_in->colortype == LCT_PALETTE) { + if(r_in >= mode_in->palettesize) return 82; + r = mode_in->palette[r_in * 4 + 0] * 257u; + g = mode_in->palette[r_in * 4 + 1] * 257u; + b = mode_in->palette[r_in * 4 + 2] * 257u; + } else { + return 31; + } + + /* now convert to output format */ + if(mode_out->colortype == LCT_GREY || mode_out->colortype == LCT_GREY_ALPHA) { + *r_out = r >> shift ; + } else if(mode_out->colortype == LCT_RGB || mode_out->colortype == LCT_RGBA) { + *r_out = r >> shift ; + *g_out = g >> shift ; + *b_out = b >> shift ; + } else if(mode_out->colortype == LCT_PALETTE) { + unsigned i; + /* a 16-bit color cannot be in the palette */ + if((r >> 8) != (r & 255) || (g >> 8) != (g & 255) || (b >> 8) != (b & 255)) return 82; + for(i = 0; i < mode_out->palettesize; i++) { + unsigned j = i * 4; + if((r >> 8) == mode_out->palette[j + 0] && (g >> 8) == mode_out->palette[j + 1] && + (b >> 8) == mode_out->palette[j + 2]) { + *r_out = i; + return 0; + } + } + return 82; + } else { + return 31; + } + + return 0; +} + #ifdef LODEPNG_COMPILE_ENCODER -void lodepng_color_profile_init(LodePNGColorProfile* profile) -{ - profile->colored = 0; - profile->key = 0; - profile->key_r = profile->key_g = profile->key_b = 0; - profile->alpha = 0; - profile->numcolors = 0; - profile->bits = 1; +void lodepng_color_stats_init(LodePNGColorStats* stats) { + /*stats*/ + stats->colored = 0; + stats->key = 0; + stats->key_r = stats->key_g = stats->key_b = 0; + stats->alpha = 0; + stats->numcolors = 0; + stats->bits = 1; + stats->numpixels = 0; + /*settings*/ + stats->allow_palette = 1; + stats->allow_greyscale = 1; } /*function used for debug purposes with C++*/ -/*void printColorProfile(LodePNGColorProfile* p) -{ +/*void printColorStats(LodePNGColorStats* p) { std::cout << "colored: " << (int)p->colored << ", "; std::cout << "key: " << (int)p->key << ", "; std::cout << "key_r: " << (int)p->key_r << ", "; @@ -3611,245 +3595,246 @@ void lodepng_color_profile_init(LodePNGColorProfile* profile) }*/ /*Returns how many bits needed to represent given value (max 8 bit)*/ -static unsigned getValueRequiredBits(unsigned char value) -{ +static unsigned getValueRequiredBits(unsigned char value) { if(value == 0 || value == 255) return 1; /*The scaling of 2-bit and 4-bit values uses multiples of 85 and 17*/ if(value % 17 == 0) return value % 85 == 0 ? 2 : 4; return 8; } -/*profile must already have been inited with mode. -It's ok to set some parameters of profile to done already.*/ -unsigned lodepng_get_color_profile(LodePNGColorProfile* profile, - const unsigned char* in, unsigned w, unsigned h, - const LodePNGColorMode* mode) -{ - unsigned error = 0; +/*stats must already have been inited. */ +void lodepng_compute_color_stats(LodePNGColorStats* stats, + const unsigned char* in, unsigned w, unsigned h, + const LodePNGColorMode* mode_in) { size_t i; ColorTree tree; size_t numpixels = (size_t)w * (size_t)h; - unsigned colored_done = lodepng_is_greyscale_type(mode) ? 1 : 0; - unsigned alpha_done = lodepng_can_have_alpha(mode) ? 0 : 1; + /* mark things as done already if it would be impossible to have a more expensive case */ + unsigned colored_done = lodepng_is_greyscale_type(mode_in) ? 1 : 0; + unsigned alpha_done = lodepng_can_have_alpha(mode_in) ? 0 : 1; unsigned numcolors_done = 0; - unsigned bpp = lodepng_get_bpp(mode); - unsigned bits_done = bpp == 1 ? 1 : 0; + unsigned bpp = lodepng_get_bpp(mode_in); + unsigned bits_done = (stats->bits == 1 && bpp == 1) ? 1 : 0; + unsigned sixteen = 0; /* whether the input image is 16 bit */ unsigned maxnumcolors = 257; - unsigned sixteen = 0; - if(bpp <= 8) maxnumcolors = bpp == 1 ? 2 : (bpp == 2 ? 4 : (bpp == 4 ? 16 : 256)); + if(bpp <= 8) maxnumcolors = LODEPNG_MIN(257, stats->numcolors + (1u << bpp)); + + stats->numpixels += numpixels; + + /*if palette not allowed, no need to compute numcolors*/ + if(!stats->allow_palette) numcolors_done = 1; color_tree_init(&tree); + /*If the stats was already filled in from previous data, fill its palette in tree + and mark things as done already if we know they are the most expensive case already*/ + if(stats->alpha) alpha_done = 1; + if(stats->colored) colored_done = 1; + if(stats->bits == 16) numcolors_done = 1; + if(stats->bits >= bpp) bits_done = 1; + if(stats->numcolors >= maxnumcolors) numcolors_done = 1; + + if(!numcolors_done) { + for(i = 0; i < stats->numcolors; i++) { + const unsigned char* color = &stats->palette[i * 4]; + color_tree_add(&tree, color[0], color[1], color[2], color[3], (unsigned)i); + } + } + /*Check if the 16-bit input is truly 16-bit*/ - if(mode->bitdepth == 16) - { + if(mode_in->bitdepth == 16 && !sixteen) { unsigned short r, g, b, a; - for(i = 0; i != numpixels; ++i) - { - getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode); + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); if((r & 255) != ((r >> 8) & 255) || (g & 255) != ((g >> 8) & 255) || - (b & 255) != ((b >> 8) & 255) || (a & 255) != ((a >> 8) & 255)) /*first and second byte differ*/ - { + (b & 255) != ((b >> 8) & 255) || (a & 255) != ((a >> 8) & 255)) /*first and second byte differ*/ { + stats->bits = 16; sixteen = 1; + bits_done = 1; + numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/ break; } } } - if(sixteen) - { + if(sixteen) { unsigned short r = 0, g = 0, b = 0, a = 0; - profile->bits = 16; - bits_done = numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/ - for(i = 0; i != numpixels; ++i) - { - getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode); + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); - if(!colored_done && (r != g || r != b)) - { - profile->colored = 1; + if(!colored_done && (r != g || r != b)) { + stats->colored = 1; colored_done = 1; } - if(!alpha_done) - { - unsigned matchkey = (r == profile->key_r && g == profile->key_g && b == profile->key_b); - if(a != 65535 && (a != 0 || (profile->key && !matchkey))) - { - profile->alpha = 1; - profile->key = 0; + if(!alpha_done) { + unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b); + if(a != 65535 && (a != 0 || (stats->key && !matchkey))) { + stats->alpha = 1; + stats->key = 0; alpha_done = 1; - } - else if(a == 0 && !profile->alpha && !profile->key) - { - profile->key = 1; - profile->key_r = r; - profile->key_g = g; - profile->key_b = b; - } - else if(a == 65535 && profile->key && matchkey) - { + } else if(a == 0 && !stats->alpha && !stats->key) { + stats->key = 1; + stats->key_r = r; + stats->key_g = g; + stats->key_b = b; + } else if(a == 65535 && stats->key && matchkey) { /* Color key cannot be used if an opaque pixel also has that RGB color. */ - profile->alpha = 1; - profile->key = 0; + stats->alpha = 1; + stats->key = 0; alpha_done = 1; } } if(alpha_done && numcolors_done && colored_done && bits_done) break; } - if(profile->key && !profile->alpha) - { - for(i = 0; i != numpixels; ++i) - { - getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode); - if(a != 0 && r == profile->key_r && g == profile->key_g && b == profile->key_b) - { + if(stats->key && !stats->alpha) { + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); + if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) { /* Color key cannot be used if an opaque pixel also has that RGB color. */ - profile->alpha = 1; - profile->key = 0; + stats->alpha = 1; + stats->key = 0; alpha_done = 1; } } } - } - else /* < 16-bit */ - { + } else /* < 16-bit */ { unsigned char r = 0, g = 0, b = 0, a = 0; - for(i = 0; i != numpixels; ++i) - { - getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode); + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); - if(!bits_done && profile->bits < 8) - { - /*only r is checked, < 8 bits is only relevant for greyscale*/ + if(!bits_done && stats->bits < 8) { + /*only r is checked, < 8 bits is only relevant for grayscale*/ unsigned bits = getValueRequiredBits(r); - if(bits > profile->bits) profile->bits = bits; + if(bits > stats->bits) stats->bits = bits; } - bits_done = (profile->bits >= bpp); + bits_done = (stats->bits >= bpp); - if(!colored_done && (r != g || r != b)) - { - profile->colored = 1; + if(!colored_done && (r != g || r != b)) { + stats->colored = 1; colored_done = 1; - if(profile->bits < 8) profile->bits = 8; /*PNG has no colored modes with less than 8-bit per channel*/ + if(stats->bits < 8) stats->bits = 8; /*PNG has no colored modes with less than 8-bit per channel*/ } - if(!alpha_done) - { - unsigned matchkey = (r == profile->key_r && g == profile->key_g && b == profile->key_b); - if(a != 255 && (a != 0 || (profile->key && !matchkey))) - { - profile->alpha = 1; - profile->key = 0; + if(!alpha_done) { + unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b); + if(a != 255 && (a != 0 || (stats->key && !matchkey))) { + stats->alpha = 1; + stats->key = 0; alpha_done = 1; - if(profile->bits < 8) profile->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ - } - else if(a == 0 && !profile->alpha && !profile->key) - { - profile->key = 1; - profile->key_r = r; - profile->key_g = g; - profile->key_b = b; - } - else if(a == 255 && profile->key && matchkey) - { + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + } else if(a == 0 && !stats->alpha && !stats->key) { + stats->key = 1; + stats->key_r = r; + stats->key_g = g; + stats->key_b = b; + } else if(a == 255 && stats->key && matchkey) { /* Color key cannot be used if an opaque pixel also has that RGB color. */ - profile->alpha = 1; - profile->key = 0; + stats->alpha = 1; + stats->key = 0; alpha_done = 1; - if(profile->bits < 8) profile->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ } } - if(!numcolors_done) - { - if(!color_tree_has(&tree, r, g, b, a)) - { - color_tree_add(&tree, r, g, b, a, profile->numcolors); - if(profile->numcolors < 256) - { - unsigned char* p = profile->palette; - unsigned n = profile->numcolors; + if(!numcolors_done) { + if(!color_tree_has(&tree, r, g, b, a)) { + color_tree_add(&tree, r, g, b, a, stats->numcolors); + if(stats->numcolors < 256) { + unsigned char* p = stats->palette; + unsigned n = stats->numcolors; p[n * 4 + 0] = r; p[n * 4 + 1] = g; p[n * 4 + 2] = b; p[n * 4 + 3] = a; } - ++profile->numcolors; - numcolors_done = profile->numcolors >= maxnumcolors; + ++stats->numcolors; + numcolors_done = stats->numcolors >= maxnumcolors; } } if(alpha_done && numcolors_done && colored_done && bits_done) break; } - if(profile->key && !profile->alpha) - { - for(i = 0; i != numpixels; ++i) - { - getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode); - if(a != 0 && r == profile->key_r && g == profile->key_g && b == profile->key_b) - { + if(stats->key && !stats->alpha) { + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); + if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) { /* Color key cannot be used if an opaque pixel also has that RGB color. */ - profile->alpha = 1; - profile->key = 0; + stats->alpha = 1; + stats->key = 0; alpha_done = 1; - if(profile->bits < 8) profile->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ } } } - /*make the profile's key always 16-bit for consistency - repeat each byte twice*/ - profile->key_r += (profile->key_r << 8); - profile->key_g += (profile->key_g << 8); - profile->key_b += (profile->key_b << 8); + /*make the stats's key always 16-bit for consistency - repeat each byte twice*/ + stats->key_r += (stats->key_r << 8); + stats->key_g += (stats->key_g << 8); + stats->key_b += (stats->key_b << 8); } color_tree_cleanup(&tree); - return error; } -/*Automatically chooses color type that gives smallest amount of bits in the -output image, e.g. grey if there are only greyscale pixels, palette if there -are less than 256 colors, ... -Updates values of mode with a potentially smaller color model. mode_out should -contain the user chosen color model, but will be overwritten with the new chosen one.*/ -unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, - const unsigned char* image, unsigned w, unsigned h, - const LodePNGColorMode* mode_in) -{ - LodePNGColorProfile prof; - unsigned error = 0; - unsigned palettebits, palette_ok; - size_t i, n; - size_t numpixels = (size_t)w * (size_t)h; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +/*Adds a single color to the color stats. The stats must already have been inited. The color must be given as 16-bit +(with 2 bytes repeating for 8-bit and 65535 for opaque alpha channel). This function is expensive, do not call it for +all pixels of an image but only for a few additional values. */ +static void lodepng_color_stats_add(LodePNGColorStats* stats, + unsigned r, unsigned g, unsigned b, unsigned a) { + unsigned char image[8]; + LodePNGColorMode mode; + lodepng_color_mode_init(&mode); + image[0] = r >> 8; image[1] = r; image[2] = g >> 8; image[3] = g; + image[4] = b >> 8; image[5] = b; image[6] = a >> 8; image[7] = a; + mode.bitdepth = 16; + mode.colortype = LCT_RGBA; + lodepng_compute_color_stats(stats, image, 1, 1, &mode); + lodepng_color_mode_cleanup(&mode); +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +unsigned auto_choose_color(LodePNGColorMode* mode_out, + const LodePNGColorMode* mode_in, + const LodePNGColorStats* stats) { + unsigned error = 0; + unsigned palettebits; + size_t i, n; + size_t numpixels = stats->numpixels; + unsigned palette_ok, gray_ok; + + unsigned alpha = stats->alpha; + unsigned key = stats->key; + unsigned bits = stats->bits; - lodepng_color_profile_init(&prof); - error = lodepng_get_color_profile(&prof, image, w, h, mode_in); - if(error) return error; mode_out->key_defined = 0; - if(prof.key && numpixels <= 16) - { - prof.alpha = 1; /*too few pixels to justify tRNS chunk overhead*/ - prof.key = 0; - if(prof.bits < 8) prof.bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + if(key && numpixels <= 16) { + alpha = 1; /*too few pixels to justify tRNS chunk overhead*/ + key = 0; + if(bits < 8) bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ } - n = prof.numcolors; - palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8)); - palette_ok = n <= 256 && prof.bits <= 8; - if(numpixels < n * 2) palette_ok = 0; /*don't add palette overhead if image has only a few pixels*/ - if(!prof.colored && prof.bits <= palettebits) palette_ok = 0; /*grey is less overhead*/ - if(palette_ok) - { - unsigned char* p = prof.palette; + gray_ok = !stats->colored; + if(!stats->allow_greyscale) gray_ok = 0; + if(!gray_ok && bits < 8) bits = 8; + + n = stats->numcolors; + palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8)); + palette_ok = n <= 256 && bits <= 8 && n != 0; /*n==0 means likely numcolors wasn't computed*/ + if(numpixels < n * 2) palette_ok = 0; /*don't add palette overhead if image has only a few pixels*/ + if(gray_ok && bits <= palettebits) palette_ok = 0; /*gray is less overhead*/ + if(!stats->allow_palette) palette_ok = 0; + + if(palette_ok) { + const unsigned char* p = stats->palette; lodepng_palette_clear(mode_out); /*remove potential earlier palette*/ - for(i = 0; i != prof.numcolors; ++i) - { + for(i = 0; i != stats->numcolors; ++i) { error = lodepng_palette_add(mode_out, p[i * 4 + 0], p[i * 4 + 1], p[i * 4 + 2], p[i * 4 + 3]); if(error) break; } @@ -3858,25 +3843,20 @@ unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, mode_out->bitdepth = palettebits; if(mode_in->colortype == LCT_PALETTE && mode_in->palettesize >= mode_out->palettesize - && mode_in->bitdepth == mode_out->bitdepth) - { + && mode_in->bitdepth == mode_out->bitdepth) { /*If input should have same palette colors, keep original to preserve its order and prevent conversion*/ lodepng_color_mode_cleanup(mode_out); lodepng_color_mode_copy(mode_out, mode_in); } - } - else /*8-bit or 16-bit per channel*/ - { - mode_out->bitdepth = prof.bits; - mode_out->colortype = prof.alpha ? (prof.colored ? LCT_RGBA : LCT_GREY_ALPHA) - : (prof.colored ? LCT_RGB : LCT_GREY); - - if(prof.key) - { - unsigned mask = (1u << mode_out->bitdepth) - 1u; /*profile always uses 16-bit, mask converts it*/ - mode_out->key_r = prof.key_r & mask; - mode_out->key_g = prof.key_g & mask; - mode_out->key_b = prof.key_b & mask; + } else /*8-bit or 16-bit per channel*/ { + mode_out->bitdepth = bits; + mode_out->colortype = alpha ? (gray_ok ? LCT_GREY_ALPHA : LCT_RGBA) + : (gray_ok ? LCT_GREY : LCT_RGB); + if(key) { + unsigned mask = (1u << mode_out->bitdepth) - 1u; /*stats always uses 16-bit, mask converts it*/ + mode_out->key_r = stats->key_r & mask; + mode_out->key_g = stats->key_g & mask; + mode_out->key_b = stats->key_b & mask; mode_out->key_defined = 1; } } @@ -3887,19 +3867,17 @@ unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, #endif /* #ifdef LODEPNG_COMPILE_ENCODER */ /* -Paeth predicter, used by PNG filter type 4 +Paeth predictor, used by PNG filter type 4 The parameters are of type short, but should come from unsigned chars, the shorts are only needed to make the paeth calculation correct. */ -static unsigned char paethPredictor(short a, short b, short c) -{ - short pa = abs(b - c); - short pb = abs(a - c); - short pc = abs(a + b - c - c); - - if(pc < pa && pc < pb) return (unsigned char)c; - else if(pb < pa) return (unsigned char)b; - else return (unsigned char)a; +static unsigned char paethPredictor(short a, short b, short c) { + short pa = LODEPNG_ABS(b - c); + short pb = LODEPNG_ABS(a - c); + short pc = LODEPNG_ABS(a + b - c - c); + /* return input value associated with smallest of pa, pb, pc (with certain priority if equal) */ + if(pb < pa) { a = b; pa = pb; } + return (pc < pa) ? c : a; } /*shared values used by multiple Adam7 related functions*/ @@ -3925,14 +3903,12 @@ bpp: bits per pixel end at a full byte */ static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], - size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) -{ + size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) { /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/ unsigned i; /*calculate width and height in pixels of each pass*/ - for(i = 0; i != 7; ++i) - { + for(i = 0; i != 7; ++i) { passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; if(passw[i] == 0) passh[i] = 0; @@ -3940,15 +3916,14 @@ static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t fil } filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; - for(i = 0; i != 7; ++i) - { + for(i = 0; i != 7; ++i) { /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/ filter_passstart[i + 1] = filter_passstart[i] - + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0); + + ((passw[i] && passh[i]) ? passh[i] * (1u + (passw[i] * bpp + 7u) / 8u) : 0); /*bits padded if needed to fill full byte at end of each scanline*/ - padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8); + padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7u) / 8u); /*only padded at end of reduced image*/ - passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8; + passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7u) / 8u; } } @@ -3960,60 +3935,51 @@ static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t fil /*read the information from the header and store it in the LodePNGInfo. return value is error*/ unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, - const unsigned char* in, size_t insize) -{ + const unsigned char* in, size_t insize) { + unsigned width, height; LodePNGInfo* info = &state->info_png; - if(insize == 0 || in == 0) - { + if(insize == 0 || in == 0) { CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/ } - if(insize < 33) - { + if(insize < 33) { CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/ } /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/ + /* TODO: remove this. One should use a new LodePNGState for new sessions */ lodepng_info_cleanup(info); lodepng_info_init(info); if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 - || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) - { + || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/ } - if(lodepng_chunk_length(in + 8) != 13) - { + if(lodepng_chunk_length(in + 8) != 13) { CERROR_RETURN_ERROR(state->error, 94); /*error: header size must be 13 bytes*/ } - if(!lodepng_chunk_type_equals(in + 8, "IHDR")) - { + if(!lodepng_chunk_type_equals(in + 8, "IHDR")) { CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/ } /*read the values given in the header*/ - *w = lodepng_read32bitInt(&in[16]); - *h = lodepng_read32bitInt(&in[20]); + width = lodepng_read32bitInt(&in[16]); + height = lodepng_read32bitInt(&in[20]); + /*TODO: remove the undocumented feature that allows to give null pointers to width or height*/ + if(w) *w = width; + if(h) *h = height; info->color.bitdepth = in[24]; info->color.colortype = (LodePNGColorType)in[25]; info->compression_method = in[26]; info->filter_method = in[27]; info->interlace_method = in[28]; - if(*w == 0 || *h == 0) - { - CERROR_RETURN_ERROR(state->error, 93); - } - - if(!state->decoder.ignore_crc) - { - unsigned CRC = lodepng_read32bitInt(&in[29]); - unsigned checksum = lodepng_crc32(&in[12], 17); - if(CRC != checksum) - { - CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/ - } - } + /*errors returned only after the parsing so other values are still output*/ + /*error: invalid image size*/ + if(width == 0 || height == 0) CERROR_RETURN_ERROR(state->error, 93); + /*error: invalid colortype or bitdepth combination*/ + state->error = checkColorValidity(info->color.colortype, info->color.bitdepth); + if(state->error) return state->error; /*error: only compression method 0 is allowed in the specification*/ if(info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32); /*error: only filter method 0 is allowed in the specification*/ @@ -4021,13 +3987,19 @@ unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, /*error: only interlace methods 0 and 1 exist in the specification*/ if(info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34); - state->error = checkColorValidity(info->color.colortype, info->color.bitdepth); + if(!state->decoder.ignore_crc) { + unsigned CRC = lodepng_read32bitInt(&in[29]); + unsigned checksum = lodepng_crc32(&in[12], 17); + if(CRC != checksum) { + CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/ + } + } + return state->error; } static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, - size_t bytewidth, unsigned char filterType, size_t length) -{ + size_t bytewidth, unsigned char filterType, size_t length) { /* For PNG filter method 0 unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, @@ -4038,8 +4010,7 @@ static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scan */ size_t i; - switch(filterType) - { + switch(filterType) { case 0: for(i = 0; i != length; ++i) recon[i] = scanline[i]; break; @@ -4048,59 +4019,83 @@ static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scan for(i = bytewidth; i < length; ++i) recon[i] = scanline[i] + recon[i - bytewidth]; break; case 2: - if(precon) - { + if(precon) { for(i = 0; i != length; ++i) recon[i] = scanline[i] + precon[i]; - } - else - { + } else { for(i = 0; i != length; ++i) recon[i] = scanline[i]; } break; case 3: - if(precon) - { - for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i] + (precon[i] >> 1); - for(i = bytewidth; i < length; ++i) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) >> 1); - } - else - { + if(precon) { + for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i] + (precon[i] >> 1u); + for(i = bytewidth; i < length; ++i) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) >> 1u); + } else { for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i]; - for(i = bytewidth; i < length; ++i) recon[i] = scanline[i] + (recon[i - bytewidth] >> 1); + for(i = bytewidth; i < length; ++i) recon[i] = scanline[i] + (recon[i - bytewidth] >> 1u); } break; case 4: - if(precon) - { - for(i = 0; i != bytewidth; ++i) - { + if(precon) { + for(i = 0; i != bytewidth; ++i) { recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/ } - for(i = bytewidth; i < length; ++i) - { + + /* Unroll independent paths of the paeth predictor. A 6x and 8x version would also be possible but that + adds too much code. Whether this actually speeds anything up at all depends on compiler and settings. */ + if(bytewidth >= 4) { + for(; i + 3 < length; i += 4) { + size_t j = i - bytewidth; + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2], s3 = scanline[i + 3]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2], r3 = recon[j + 3]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2], p3 = precon[i + 3]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2], q3 = precon[j + 3]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + recon[i + 2] = s2 + paethPredictor(r2, p2, q2); + recon[i + 3] = s3 + paethPredictor(r3, p3, q3); + } + } else if(bytewidth >= 3) { + for(; i + 2 < length; i += 3) { + size_t j = i - bytewidth; + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + recon[i + 2] = s2 + paethPredictor(r2, p2, q2); + } + } else if(bytewidth >= 2) { + for(; i + 1 < length; i += 2) { + size_t j = i - bytewidth; + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + } + } + + for(; i != length; ++i) { recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth])); } - } - else - { - for(i = 0; i != bytewidth; ++i) - { + } else { + for(i = 0; i != bytewidth; ++i) { recon[i] = scanline[i]; } - for(i = bytewidth; i < length; ++i) - { + for(i = bytewidth; i < length; ++i) { /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/ recon[i] = (scanline[i] + recon[i - bytewidth]); } } break; - default: return 36; /*error: unexisting filter type given*/ + default: return 36; /*error: nonexistent filter type given*/ } return 0; } -static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ +static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { /* For PNG filter method 0 this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times) @@ -4113,11 +4108,10 @@ static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w unsigned char* prevline = 0; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ - size_t bytewidth = (bpp + 7) / 8; - size_t linebytes = (w * bpp + 7) / 8; + size_t bytewidth = (bpp + 7u) / 8u; + size_t linebytes = (w * bpp + 7u) / 8u; - for(y = 0; y < h; ++y) - { + for(y = 0; y < h; ++y) { size_t outindex = linebytes * y; size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ unsigned char filterType = in[inindex]; @@ -4141,50 +4135,39 @@ out must be big enough AND must be 0 everywhere if bpp < 8 in the current implem (because that's likely a little bit faster) NOTE: comments about padding bits are only relevant if bpp < 8 */ -static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ +static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; unsigned i; Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - if(bpp >= 8) - { - for(i = 0; i != 7; ++i) - { + if(bpp >= 8) { + for(i = 0; i != 7; ++i) { unsigned x, y, b; - size_t bytewidth = bpp / 8; + size_t bytewidth = bpp / 8u; for(y = 0; y < passh[i]; ++y) - for(x = 0; x < passw[i]; ++x) - { + for(x = 0; x < passw[i]; ++x) { size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; - for(b = 0; b < bytewidth; ++b) - { + for(b = 0; b < bytewidth; ++b) { out[pixeloutstart + b] = in[pixelinstart + b]; } } } - } - else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ - { - for(i = 0; i != 7; ++i) - { + } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ { + for(i = 0; i != 7; ++i) { unsigned x, y, b; unsigned ilinebits = bpp * passw[i]; unsigned olinebits = bpp * w; size_t obp, ibp; /*bit pointers (for out and in buffer)*/ for(y = 0; y < passh[i]; ++y) - for(x = 0; x < passw[i]; ++x) - { + for(x = 0; x < passw[i]; ++x) { ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; - for(b = 0; b < bpp; ++b) - { + for(b = 0; b < bpp; ++b) { unsigned char bit = readBitFromReversedStream(&ibp, in); - /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/ - setBitOfReversedStream0(&obp, out, bit); + setBitOfReversedStream(&obp, out, bit); } } } @@ -4192,8 +4175,7 @@ static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsig } static void removePaddingBits(unsigned char* out, const unsigned char* in, - size_t olinebits, size_t ilinebits, unsigned h) -{ + size_t olinebits, size_t ilinebits, unsigned h) { /* After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers @@ -4206,11 +4188,9 @@ static void removePaddingBits(unsigned char* out, const unsigned char* in, unsigned y; size_t diff = ilinebits - olinebits; size_t ibp = 0, obp = 0; /*input and output bit pointers*/ - for(y = 0; y < h; ++y) - { + for(y = 0; y < h; ++y) { size_t x; - for(x = 0; x < olinebits; ++x) - { + for(x = 0; x < olinebits; ++x) { unsigned char bit = readBitFromReversedStream(&ibp, in); setBitOfReversedStream(&obp, out, bit); } @@ -4222,46 +4202,39 @@ static void removePaddingBits(unsigned char* out, const unsigned char* in, the IDAT chunks (with filter index bytes and possible padding bits) return value is error*/ static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, - unsigned w, unsigned h, const LodePNGInfo* info_png) -{ + unsigned w, unsigned h, const LodePNGInfo* info_png) { /* This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. Steps: - *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8) + *) if no Adam7: 1) unfilter 2) remove padding bits (= possible extra bits per scanline if bpp < 8) *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace NOTE: the in buffer will be overwritten with intermediate data! */ unsigned bpp = lodepng_get_bpp(&info_png->color); if(bpp == 0) return 31; /*error: invalid colortype*/ - if(info_png->interlace_method == 0) - { - if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) - { + if(info_png->interlace_method == 0) { + if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) { CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp)); - removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h); + removePaddingBits(out, in, w * bpp, ((w * bpp + 7u) / 8u) * 8u, h); } /*we can immediately filter into the out buffer, no other steps needed*/ else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp)); - } - else /*interlace_method is 1 (Adam7)*/ - { + } else /*interlace_method is 1 (Adam7)*/ { unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; unsigned i; Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - for(i = 0; i != 7; ++i) - { + for(i = 0; i != 7; ++i) { CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp)); /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, move bytes instead of bits or move not at all*/ - if(bpp < 8) - { + if(bpp < 8) { /*remove padding bits in scanlines; after this there still may be padding bits between the different reduced images: each reduced image still starts nicely at a byte*/ removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, - ((passw[i] * bpp + 7) / 8) * 8, passh[i]); + ((passw[i] * bpp + 7u) / 8u) * 8u, passh[i]); } } @@ -4271,21 +4244,17 @@ static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, return 0; } -static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) -{ +static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) { unsigned pos = 0, i; - if(color->palette) lodepng_free(color->palette); - color->palettesize = chunkLength / 3; - color->palette = (unsigned char*)lodepng_malloc(4 * color->palettesize); - if(!color->palette && color->palettesize) - { + color->palettesize = chunkLength / 3u; + if(color->palettesize == 0 || color->palettesize > 256) return 38; /*error: palette too small or big*/ + lodepng_color_mode_alloc_palette(color); + if(!color->palette && color->palettesize) { color->palettesize = 0; return 83; /*alloc fail*/ } - if(color->palettesize > 256) return 38; /*error: palette too big*/ - for(i = 0; i != color->palettesize; ++i) - { + for(i = 0; i != color->palettesize; ++i) { color->palette[4 * i + 0] = data[pos++]; /*R*/ color->palette[4 * i + 1] = data[pos++]; /*G*/ color->palette[4 * i + 2] = data[pos++]; /*B*/ @@ -4295,26 +4264,20 @@ static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* dat return 0; /* OK */ } -static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) -{ +static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) { unsigned i; - if(color->colortype == LCT_PALETTE) - { + if(color->colortype == LCT_PALETTE) { /*error: more alpha values given than there are palette entries*/ - if(chunkLength > color->palettesize) return 38; + if(chunkLength > color->palettesize) return 39; for(i = 0; i != chunkLength; ++i) color->palette[4 * i + 3] = data[i]; - } - else if(color->colortype == LCT_GREY) - { - /*error: this chunk must be 2 bytes for greyscale image*/ + } else if(color->colortype == LCT_GREY) { + /*error: this chunk must be 2 bytes for grayscale image*/ if(chunkLength != 2) return 30; color->key_defined = 1; color->key_r = color->key_g = color->key_b = 256u * data[0] + data[1]; - } - else if(color->colortype == LCT_RGB) - { + } else if(color->colortype == LCT_RGB) { /*error: this chunk must be 6 bytes for RGB image*/ if(chunkLength != 6) return 41; @@ -4331,29 +4294,28 @@ static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* dat #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS /*background color chunk (bKGD)*/ -static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) -{ - if(info->color.colortype == LCT_PALETTE) - { +static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(info->color.colortype == LCT_PALETTE) { /*error: this chunk must be 1 byte for indexed color image*/ if(chunkLength != 1) return 43; + /*error: invalid palette index, or maybe this chunk appeared before PLTE*/ + if(data[0] >= info->color.palettesize) return 103; + info->background_defined = 1; info->background_r = info->background_g = info->background_b = data[0]; - } - else if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) - { - /*error: this chunk must be 2 bytes for greyscale image*/ + } else if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) { + /*error: this chunk must be 2 bytes for grayscale image*/ if(chunkLength != 2) return 44; + /*the values are truncated to bitdepth in the PNG file*/ info->background_defined = 1; info->background_r = info->background_g = info->background_b = 256u * data[0] + data[1]; - } - else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) - { - /*error: this chunk must be 6 bytes for greyscale image*/ + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) { + /*error: this chunk must be 6 bytes for grayscale image*/ if(chunkLength != 6) return 45; + /*the values are truncated to bitdepth in the PNG file*/ info->background_defined = 1; info->background_r = 256u * data[0] + data[1]; info->background_g = 256u * data[2] + data[3]; @@ -4364,14 +4326,12 @@ static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, siz } /*text chunk (tEXt)*/ -static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) -{ +static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { unsigned error = 0; char *key = 0, *str = 0; unsigned i; - while(!error) /*not really a while loop, only used to break on error*/ - { + while(!error) /*not really a while loop, only used to break on error*/ { unsigned length, string2_begin; length = 0; @@ -4408,8 +4368,7 @@ static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, siz /*compressed text chunk (zTXt)*/ static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings, - const unsigned char* data, size_t chunkLength) -{ + const unsigned char* data, size_t chunkLength) { unsigned error = 0; unsigned i; @@ -4419,8 +4378,7 @@ static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSetting ucvector_init(&decoded); - while(!error) /*not really a while loop, only used to break on error*/ - { + while(!error) /*not really a while loop, only used to break on error*/ { for(length = 0; length < chunkLength && data[length] != 0; ++length) ; if(length + 2 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/ if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ @@ -4439,7 +4397,7 @@ static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSetting length = (unsigned)chunkLength - string2_begin; /*will fail if zlib error, e.g. if length is too small*/ error = zlib_decompress(&decoded.data, &decoded.size, - (unsigned char*)(&data[string2_begin]), + &data[string2_begin], length, zlibsettings); if(error) break; ucvector_push_back(&decoded, 0); @@ -4457,18 +4415,16 @@ static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSetting /*international text chunk (iTXt)*/ static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings, - const unsigned char* data, size_t chunkLength) -{ + const unsigned char* data, size_t chunkLength) { unsigned error = 0; unsigned i; unsigned length, begin, compressed; char *key = 0, *langtag = 0, *transkey = 0; ucvector decoded; - ucvector_init(&decoded); + ucvector_init(&decoded); /* TODO: only use in case of compressed text */ - while(!error) /*not really a while loop, only used to break on error*/ - { + while(!error) /*not really a while loop, only used to break on error*/ { /*Quick check if the chunk length isn't too small. Even without check it'd still fail with other error checks below if it's too short. This just gives a different error code.*/ if(chunkLength < 5) CERROR_BREAK(error, 30); /*iTXt chunk too short*/ @@ -4518,18 +4474,15 @@ static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecompressSetting length = (unsigned)chunkLength < begin ? 0 : (unsigned)chunkLength - begin; - if(compressed) - { + if(compressed) { /*will fail if zlib error, e.g. if length is too small*/ error = zlib_decompress(&decoded.data, &decoded.size, - (unsigned char*)(&data[begin]), + &data[begin], length, zlibsettings); if(error) break; if(decoded.allocsize < decoded.size) decoded.allocsize = decoded.size; ucvector_push_back(&decoded, 0); - } - else - { + } else { if(!ucvector_resize(&decoded, length + 1)) CERROR_BREAK(error, 83 /*alloc fail*/); decoded.data[length] = 0; @@ -4549,8 +4502,7 @@ static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecompressSetting return error; } -static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) -{ +static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { if(chunkLength != 7) return 73; /*invalid tIME chunk size*/ info->time_defined = 1; @@ -4564,8 +4516,7 @@ static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, siz return 0; /* OK */ } -static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) -{ +static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { if(chunkLength != 9) return 74; /*invalid pHYs chunk size*/ info->phys_defined = 1; @@ -4575,19 +4526,152 @@ static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, siz return 0; /* OK */ } + +static unsigned readChunk_gAMA(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 4) return 96; /*invalid gAMA chunk size*/ + + info->gama_defined = 1; + info->gama_gamma = 16777216u * data[0] + 65536u * data[1] + 256u * data[2] + data[3]; + + return 0; /* OK */ +} + +static unsigned readChunk_cHRM(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 32) return 97; /*invalid cHRM chunk size*/ + + info->chrm_defined = 1; + info->chrm_white_x = 16777216u * data[ 0] + 65536u * data[ 1] + 256u * data[ 2] + data[ 3]; + info->chrm_white_y = 16777216u * data[ 4] + 65536u * data[ 5] + 256u * data[ 6] + data[ 7]; + info->chrm_red_x = 16777216u * data[ 8] + 65536u * data[ 9] + 256u * data[10] + data[11]; + info->chrm_red_y = 16777216u * data[12] + 65536u * data[13] + 256u * data[14] + data[15]; + info->chrm_green_x = 16777216u * data[16] + 65536u * data[17] + 256u * data[18] + data[19]; + info->chrm_green_y = 16777216u * data[20] + 65536u * data[21] + 256u * data[22] + data[23]; + info->chrm_blue_x = 16777216u * data[24] + 65536u * data[25] + 256u * data[26] + data[27]; + info->chrm_blue_y = 16777216u * data[28] + 65536u * data[29] + 256u * data[30] + data[31]; + + return 0; /* OK */ +} + +static unsigned readChunk_sRGB(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 1) return 98; /*invalid sRGB chunk size (this one is never ignored)*/ + + info->srgb_defined = 1; + info->srgb_intent = data[0]; + + return 0; /* OK */ +} + +static unsigned readChunk_iCCP(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings, + const unsigned char* data, size_t chunkLength) { + unsigned error = 0; + unsigned i; + + unsigned length, string2_begin; + ucvector decoded; + + info->iccp_defined = 1; + if(info->iccp_name) lodepng_clear_icc(info); + + for(length = 0; length < chunkLength && data[length] != 0; ++length) ; + if(length + 2 >= chunkLength) return 75; /*no null termination, corrupt?*/ + if(length < 1 || length > 79) return 89; /*keyword too short or long*/ + + info->iccp_name = (char*)lodepng_malloc(length + 1); + if(!info->iccp_name) return 83; /*alloc fail*/ + + info->iccp_name[length] = 0; + for(i = 0; i != length; ++i) info->iccp_name[i] = (char)data[i]; + + if(data[length + 1] != 0) return 72; /*the 0 byte indicating compression must be 0*/ + + string2_begin = length + 2; + if(string2_begin > chunkLength) return 75; /*no null termination, corrupt?*/ + + length = (unsigned)chunkLength - string2_begin; + ucvector_init(&decoded); + error = zlib_decompress(&decoded.data, &decoded.size, + &data[string2_begin], + length, zlibsettings); + if(!error) { + if(decoded.size) { + info->iccp_profile_size = (unsigned)decoded.size; + info->iccp_profile = (unsigned char*)lodepng_malloc(decoded.size); + if(info->iccp_profile) { + lodepng_memcpy(info->iccp_profile, decoded.data, decoded.size); + } else { + error = 83; /* alloc fail */ + } + } else { + error = 100; /*invalid ICC profile size*/ + } + } + ucvector_cleanup(&decoded); + return error; +} #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos, + const unsigned char* in, size_t insize) { + const unsigned char* chunk = in + pos; + unsigned chunkLength; + const unsigned char* data; + unsigned unhandled = 0; + unsigned error = 0; + + if (pos + 4 > insize) return 30; + chunkLength = lodepng_chunk_length(chunk); + if(chunkLength > 2147483647) return 63; + data = lodepng_chunk_data_const(chunk); + if(data + chunkLength + 4 > in + insize) return 30; + + if(lodepng_chunk_type_equals(chunk, "PLTE")) { + error = readChunk_PLTE(&state->info_png.color, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tRNS")) { + error = readChunk_tRNS(&state->info_png.color, data, chunkLength); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + } else if(lodepng_chunk_type_equals(chunk, "bKGD")) { + error = readChunk_bKGD(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tEXt")) { + error = readChunk_tEXt(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "zTXt")) { + error = readChunk_zTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "iTXt")) { + error = readChunk_iTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tIME")) { + error = readChunk_tIME(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "pHYs")) { + error = readChunk_pHYs(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "gAMA")) { + error = readChunk_gAMA(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "cHRM")) { + error = readChunk_cHRM(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "sRGB")) { + error = readChunk_sRGB(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "iCCP")) { + error = readChunk_iCCP(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } else { + /* unhandled chunk is ok (is not an error) */ + unhandled = 1; + } + + if(!error && !unhandled && !state->decoder.ignore_crc) { + if(lodepng_chunk_check_crc(chunk)) return 57; /*invalid CRC*/ + } + + return error; +} + /*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, - const unsigned char* in, size_t insize) -{ + const unsigned char* in, size_t insize) { unsigned char IEND = 0; const unsigned char* chunk; size_t i; ucvector idat; /*the data from idat chunks*/ - ucvector scanlines; - size_t predict; + unsigned char* scanlines = 0; + size_t scanlines_size = 0, expected_size = 0; size_t outsize = 0; /*for unknown chunk order*/ @@ -4596,14 +4680,15 @@ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/ #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - /*provide some proper output values if error will happen*/ + + /* safe output values in case error happens */ *out = 0; + *w = *h = 0; state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/ if(state->error) return; - if(lodepng_pixel_overflow(*w, *h, &state->info_png.color, &state->info_raw)) - { + if(lodepng_pixel_overflow(*w, *h, &state->info_png.color, &state->info_raw)) { CERROR_RETURN(state->error, 92); /*overflow possible due to amount of pixels*/ } @@ -4612,14 +4697,12 @@ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is put at the start of the in buffer*/ - while(!IEND && !state->error) - { + while(!IEND && !state->error) { unsigned chunkLength; const unsigned char* data; /*the data in the chunk*/ /*error: size of the in buffer too small to contain next chunk*/ - if((size_t)((chunk - in) + 12) > insize || chunk < in) - { + if((size_t)((chunk - in) + 12) > insize || chunk < in) { if(state->decoder.ignore_end) break; /*other errors may still happen though*/ CERROR_BREAK(state->error, 30); } @@ -4627,22 +4710,21 @@ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/ chunkLength = lodepng_chunk_length(chunk); /*error: chunk length larger than the max PNG chunk size*/ - if(chunkLength > 2147483647) - { + if(chunkLength > 2147483647) { if(state->decoder.ignore_end) break; /*other errors may still happen though*/ CERROR_BREAK(state->error, 63); } - if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in) - { + if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in) { CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk*/ } data = lodepng_chunk_data_const(chunk); + unknown = 0; + /*IDAT chunk, containing compressed image data*/ - if(lodepng_chunk_type_equals(chunk, "IDAT")) - { + if(lodepng_chunk_type_equals(chunk, "IDAT")) { size_t oldsize = idat.size; size_t newsize; if(lodepng_addofl(oldsize, chunkLength, &newsize)) CERROR_BREAK(state->error, 95); @@ -4651,84 +4733,73 @@ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS critical_pos = 3; #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - } - /*IEND chunk*/ - else if(lodepng_chunk_type_equals(chunk, "IEND")) - { + } else if(lodepng_chunk_type_equals(chunk, "IEND")) { + /*IEND chunk*/ IEND = 1; - } - /*palette chunk (PLTE)*/ - else if(lodepng_chunk_type_equals(chunk, "PLTE")) - { + } else if(lodepng_chunk_type_equals(chunk, "PLTE")) { + /*palette chunk (PLTE)*/ state->error = readChunk_PLTE(&state->info_png.color, data, chunkLength); if(state->error) break; #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS critical_pos = 2; #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - } - /*palette transparency chunk (tRNS)*/ - else if(lodepng_chunk_type_equals(chunk, "tRNS")) - { + } else if(lodepng_chunk_type_equals(chunk, "tRNS")) { + /*palette transparency chunk (tRNS). Even though this one is an ancillary chunk , it is still compiled + in without 'LODEPNG_COMPILE_ANCILLARY_CHUNKS' because it contains essential color information that + affects the alpha channel of pixels. */ state->error = readChunk_tRNS(&state->info_png.color, data, chunkLength); if(state->error) break; - } #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /*background color chunk (bKGD)*/ - else if(lodepng_chunk_type_equals(chunk, "bKGD")) - { + /*background color chunk (bKGD)*/ + } else if(lodepng_chunk_type_equals(chunk, "bKGD")) { state->error = readChunk_bKGD(&state->info_png, data, chunkLength); if(state->error) break; - } - /*text chunk (tEXt)*/ - else if(lodepng_chunk_type_equals(chunk, "tEXt")) - { - if(state->decoder.read_text_chunks) - { + } else if(lodepng_chunk_type_equals(chunk, "tEXt")) { + /*text chunk (tEXt)*/ + if(state->decoder.read_text_chunks) { state->error = readChunk_tEXt(&state->info_png, data, chunkLength); if(state->error) break; } - } - /*compressed text chunk (zTXt)*/ - else if(lodepng_chunk_type_equals(chunk, "zTXt")) - { - if(state->decoder.read_text_chunks) - { + } else if(lodepng_chunk_type_equals(chunk, "zTXt")) { + /*compressed text chunk (zTXt)*/ + if(state->decoder.read_text_chunks) { state->error = readChunk_zTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); if(state->error) break; } - } - /*international text chunk (iTXt)*/ - else if(lodepng_chunk_type_equals(chunk, "iTXt")) - { - if(state->decoder.read_text_chunks) - { + } else if(lodepng_chunk_type_equals(chunk, "iTXt")) { + /*international text chunk (iTXt)*/ + if(state->decoder.read_text_chunks) { state->error = readChunk_iTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); if(state->error) break; } - } - else if(lodepng_chunk_type_equals(chunk, "tIME")) - { + } else if(lodepng_chunk_type_equals(chunk, "tIME")) { state->error = readChunk_tIME(&state->info_png, data, chunkLength); if(state->error) break; - } - else if(lodepng_chunk_type_equals(chunk, "pHYs")) - { + } else if(lodepng_chunk_type_equals(chunk, "pHYs")) { state->error = readChunk_pHYs(&state->info_png, data, chunkLength); if(state->error) break; - } + } else if(lodepng_chunk_type_equals(chunk, "gAMA")) { + state->error = readChunk_gAMA(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "cHRM")) { + state->error = readChunk_cHRM(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "sRGB")) { + state->error = readChunk_sRGB(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "iCCP")) { + state->error = readChunk_iCCP(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); + if(state->error) break; #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - else /*it's not an implemented chunk type, so ignore it: skip over the data*/ - { + } else /*it's not an implemented chunk type, so ignore it: skip over the data*/ { /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ - if(!state->decoder.ignore_critical && !lodepng_chunk_ancillary(chunk)) - { + if(!state->decoder.ignore_critical && !lodepng_chunk_ancillary(chunk)) { CERROR_BREAK(state->error, 69); } unknown = 1; #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - if(state->decoder.remember_unknown_chunks) - { + if(state->decoder.remember_unknown_chunks) { state->error = lodepng_chunk_append(&state->info_png.unknown_chunks_data[critical_pos - 1], &state->info_png.unknown_chunks_size[critical_pos - 1], chunk); if(state->error) break; @@ -4736,93 +4807,86 @@ static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ } - if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ - { + if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ { if(lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/ } if(!IEND) chunk = lodepng_chunk_next_const(chunk); } - ucvector_init(&scanlines); /*predict output size, to allocate exact size for output buffer to avoid more dynamic allocation. If the decompressed size does not match the prediction, the image must be corrupt.*/ - if(state->info_png.interlace_method == 0) - { - predict = lodepng_get_raw_size_idat(*w, *h, &state->info_png.color); - } - else - { - /*Adam-7 interlaced: predicted size is the sum of the 7 sub-images sizes*/ + if(state->info_png.interlace_method == 0) { + expected_size = lodepng_get_raw_size_idat(*w, *h, &state->info_png.color); + } else { + /*Adam-7 interlaced: expected size is the sum of the 7 sub-images sizes*/ const LodePNGColorMode* color = &state->info_png.color; - predict = 0; - predict += lodepng_get_raw_size_idat((*w + 7) >> 3, (*h + 7) >> 3, color); - if(*w > 4) predict += lodepng_get_raw_size_idat((*w + 3) >> 3, (*h + 7) >> 3, color); - predict += lodepng_get_raw_size_idat((*w + 3) >> 2, (*h + 3) >> 3, color); - if(*w > 2) predict += lodepng_get_raw_size_idat((*w + 1) >> 2, (*h + 3) >> 2, color); - predict += lodepng_get_raw_size_idat((*w + 1) >> 1, (*h + 1) >> 2, color); - if(*w > 1) predict += lodepng_get_raw_size_idat((*w + 0) >> 1, (*h + 1) >> 1, color); - predict += lodepng_get_raw_size_idat((*w + 0), (*h + 0) >> 1, color); + expected_size = 0; + expected_size += lodepng_get_raw_size_idat((*w + 7) >> 3, (*h + 7) >> 3, color); + if(*w > 4) expected_size += lodepng_get_raw_size_idat((*w + 3) >> 3, (*h + 7) >> 3, color); + expected_size += lodepng_get_raw_size_idat((*w + 3) >> 2, (*h + 3) >> 3, color); + if(*w > 2) expected_size += lodepng_get_raw_size_idat((*w + 1) >> 2, (*h + 3) >> 2, color); + expected_size += lodepng_get_raw_size_idat((*w + 1) >> 1, (*h + 1) >> 2, color); + if(*w > 1) expected_size += lodepng_get_raw_size_idat((*w + 0) >> 1, (*h + 1) >> 1, color); + expected_size += lodepng_get_raw_size_idat((*w + 0), (*h + 0) >> 1, color); } - if(!state->error && !ucvector_reserve(&scanlines, predict)) state->error = 83; /*alloc fail*/ - if(!state->error) - { - state->error = zlib_decompress(&scanlines.data, &scanlines.size, idat.data, + if(!state->error) { + /* This allocated data will be realloced by zlib_decompress, initially at + smaller size again. But the fact that it's already allocated at full size + here speeds the multiple reallocs up. TODO: make zlib_decompress support + receiving already allocated buffer with expected size instead. */ + scanlines = (unsigned char*)lodepng_malloc(expected_size); + if(!scanlines) state->error = 83; /*alloc fail*/ + scanlines_size = 0; + } + if(!state->error) { + state->error = zlib_decompress(&scanlines, &scanlines_size, idat.data, idat.size, &state->decoder.zlibsettings); - if(!state->error && scanlines.size != predict) state->error = 91; /*decompressed size doesn't match prediction*/ + if(!state->error && scanlines_size != expected_size) state->error = 91; /*decompressed size doesn't match prediction*/ } ucvector_cleanup(&idat); - if(!state->error) - { + if(!state->error) { outsize = lodepng_get_raw_size(*w, *h, &state->info_png.color); *out = (unsigned char*)lodepng_malloc(outsize); if(!*out) state->error = 83; /*alloc fail*/ } - if(!state->error) - { + if(!state->error) { for(i = 0; i < outsize; i++) (*out)[i] = 0; - state->error = postProcessScanlines(*out, scanlines.data, *w, *h, &state->info_png); + state->error = postProcessScanlines(*out, scanlines, *w, *h, &state->info_png); } - ucvector_cleanup(&scanlines); + lodepng_free(scanlines); } unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, - const unsigned char* in, size_t insize) -{ + const unsigned char* in, size_t insize) { *out = 0; decodeGeneric(out, w, h, state, in, insize); if(state->error) return state->error; - if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) - { + if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) { /*same color type, no copying or converting of data needed*/ /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype the raw image has to the end user*/ - if(!state->decoder.color_convert) - { + if(!state->decoder.color_convert) { state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color); if(state->error) return state->error; } - } - else - { + } else { /*color conversion needed; sort of copy of the data*/ unsigned char* data = *out; size_t outsize; /*TODO: check if this works according to the statement in the documentation: "The converter can convert - from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/ + from grayscale input color type, to 8-bit grayscale or grayscale with alpha"*/ if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA) - && !(state->info_raw.bitdepth == 8)) - { + && !(state->info_raw.bitdepth == 8)) { return 56; /*unsupported color mode conversion*/ } outsize = lodepng_get_raw_size(*w, *h, &state->info_raw); *out = (unsigned char*)lodepng_malloc(outsize); - if(!(*out)) - { + if(!(*out)) { state->error = 83; /*alloc fail*/ } else state->error = lodepng_convert(*out, data, &state->info_raw, @@ -4833,8 +4897,7 @@ unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, } unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, - size_t insize, LodePNGColorType colortype, unsigned bitdepth) -{ + size_t insize, LodePNGColorType colortype, unsigned bitdepth) { unsigned error; LodePNGState state; lodepng_state_init(&state); @@ -4845,42 +4908,39 @@ unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, co return error; } -unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) -{ +unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) { return lodepng_decode_memory(out, w, h, in, insize, LCT_RGBA, 8); } -unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) -{ +unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) { return lodepng_decode_memory(out, w, h, in, insize, LCT_RGB, 8); } #ifdef LODEPNG_COMPILE_DISK unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { unsigned char* buffer = 0; size_t buffersize; unsigned error; + /* safe output values in case error happens */ + *out = 0; + *w = *h = 0; error = lodepng_load_file(&buffer, &buffersize, filename); if(!error) error = lodepng_decode_memory(out, w, h, buffer, buffersize, colortype, bitdepth); lodepng_free(buffer); return error; } -unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) -{ +unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) { return lodepng_decode_file(out, w, h, filename, LCT_RGBA, 8); } -unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) -{ +unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) { return lodepng_decode_file(out, w, h, filename, LCT_RGB, 8); } #endif /*LODEPNG_COMPILE_DISK*/ -void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) -{ +void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) { settings->color_convert = 1; #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS settings->read_text_chunks = 1; @@ -4896,8 +4956,7 @@ void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) #if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) -void lodepng_state_init(LodePNGState* state) -{ +void lodepng_state_init(LodePNGState* state) { #ifdef LODEPNG_COMPILE_DECODER lodepng_decoder_settings_init(&state->decoder); #endif /*LODEPNG_COMPILE_DECODER*/ @@ -4909,14 +4968,12 @@ void lodepng_state_init(LodePNGState* state) state->error = 1; } -void lodepng_state_cleanup(LodePNGState* state) -{ +void lodepng_state_cleanup(LodePNGState* state) { lodepng_color_mode_cleanup(&state->info_raw); lodepng_info_cleanup(&state->info_png); } -void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) -{ +void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) { lodepng_state_cleanup(dest); *dest = *source; lodepng_color_mode_init(&dest->info_raw); @@ -4934,15 +4991,13 @@ void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) /* ////////////////////////////////////////////////////////////////////////// */ /*chunkName must be string of 4 characters*/ -static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length) -{ +static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length) { CERROR_TRY_RETURN(lodepng_chunk_create(&out->data, &out->size, (unsigned)length, chunkName, data)); out->allocsize = out->size; /*fix the allocsize again*/ return 0; } -static void writeSignature(ucvector* out) -{ +static void writeSignature(ucvector* out) { /*8 bytes PNG signature, aka the magic bytes*/ ucvector_push_back(out, 137); ucvector_push_back(out, 80); @@ -4955,34 +5010,26 @@ static void writeSignature(ucvector* out) } static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method) -{ - unsigned error = 0; - ucvector header; - ucvector_init(&header); + LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method) { + unsigned char data[13]; - lodepng_add32bitInt(&header, w); /*width*/ - lodepng_add32bitInt(&header, h); /*height*/ - ucvector_push_back(&header, (unsigned char)bitdepth); /*bit depth*/ - ucvector_push_back(&header, (unsigned char)colortype); /*color type*/ - ucvector_push_back(&header, 0); /*compression method*/ - ucvector_push_back(&header, 0); /*filter method*/ - ucvector_push_back(&header, interlace_method); /*interlace method*/ + lodepng_set32bitInt(data + 0, w); /*width*/ + lodepng_set32bitInt(data + 4, h); /*height*/ + data[8] = (unsigned char)bitdepth; /*bit depth*/ + data[9] = (unsigned char)colortype; /*color type*/ + data[10] = 0; /*compression method*/ + data[11] = 0; /*filter method*/ + data[12] = interlace_method; /*interlace method*/ - error = addChunk(out, "IHDR", header.data, header.size); - ucvector_cleanup(&header); - - return error; + return addChunk(out, "IHDR", data, sizeof(data)); } -static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) -{ +static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) { unsigned error = 0; size_t i; ucvector PLTE; ucvector_init(&PLTE); - for(i = 0; i != info->palettesize * 4; ++i) - { + for(i = 0; i != info->palettesize * 4; ++i) { /*add all channels except alpha channel*/ if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]); } @@ -4992,36 +5039,27 @@ static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) return error; } -static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) -{ +static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) { unsigned error = 0; size_t i; ucvector tRNS; ucvector_init(&tRNS); - if(info->colortype == LCT_PALETTE) - { + if(info->colortype == LCT_PALETTE) { size_t amount = info->palettesize; /*the tail of palette values that all have 255 as alpha, does not have to be encoded*/ - for(i = info->palettesize; i != 0; --i) - { + for(i = info->palettesize; i != 0; --i) { if(info->palette[4 * (i - 1) + 3] == 255) --amount; else break; } /*add only alpha channel*/ for(i = 0; i != amount; ++i) ucvector_push_back(&tRNS, info->palette[4 * i + 3]); - } - else if(info->colortype == LCT_GREY) - { - if(info->key_defined) - { + } else if(info->colortype == LCT_GREY) { + if(info->key_defined) { ucvector_push_back(&tRNS, (unsigned char)(info->key_r >> 8)); ucvector_push_back(&tRNS, (unsigned char)(info->key_r & 255)); } - } - else if(info->colortype == LCT_RGB) - { - if(info->key_defined) - { + } else if(info->colortype == LCT_RGB) { + if(info->key_defined) { ucvector_push_back(&tRNS, (unsigned char)(info->key_r >> 8)); ucvector_push_back(&tRNS, (unsigned char)(info->key_r & 255)); ucvector_push_back(&tRNS, (unsigned char)(info->key_g >> 8)); @@ -5038,8 +5076,7 @@ static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) } static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize, - LodePNGCompressSettings* zlibsettings) -{ + LodePNGCompressSettings* zlibsettings) { ucvector zlibdata; unsigned error = 0; @@ -5052,8 +5089,7 @@ static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t d return error; } -static unsigned addChunk_IEND(ucvector* out) -{ +static unsigned addChunk_IEND(ucvector* out) { unsigned error = 0; error = addChunk(out, "IEND", 0, 0); return error; @@ -5061,8 +5097,7 @@ static unsigned addChunk_IEND(ucvector* out) #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) -{ +static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) { unsigned error = 0; size_t i; ucvector text; @@ -5078,11 +5113,10 @@ static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* te } static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring, - LodePNGCompressSettings* zlibsettings) -{ + LodePNGCompressSettings* zlibsettings) { unsigned error = 0; ucvector data, compressed; - size_t i, textsize = strlen(textstring); + size_t i, textsize = lodepng_strlen(textstring); ucvector_init(&data); ucvector_init(&compressed); @@ -5092,9 +5126,8 @@ static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* te ucvector_push_back(&data, 0); /*compression method: 0*/ error = zlib_compress(&compressed.data, &compressed.size, - (unsigned char*)textstring, textsize, zlibsettings); - if(!error) - { + (const unsigned char*)textstring, textsize, zlibsettings); + if(!error) { for(i = 0; i != compressed.size; ++i) ucvector_push_back(&data, compressed.data[i]); error = addChunk(out, "zTXt", data.data, data.size); } @@ -5105,11 +5138,10 @@ static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* te } static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag, - const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings) -{ + const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings) { unsigned error = 0; ucvector data; - size_t i, textsize = strlen(textstring); + size_t i, textsize = lodepng_strlen(textstring); ucvector_init(&data); @@ -5123,20 +5155,16 @@ static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* ke for(i = 0; transkey[i] != 0; ++i) ucvector_push_back(&data, (unsigned char)transkey[i]); ucvector_push_back(&data, 0); /*null termination char*/ - if(compressed) - { + if(compressed) { ucvector compressed_data; ucvector_init(&compressed_data); error = zlib_compress(&compressed_data.data, &compressed_data.size, - (unsigned char*)textstring, textsize, zlibsettings); - if(!error) - { + (const unsigned char*)textstring, textsize, zlibsettings); + if(!error) { for(i = 0; i != compressed_data.size; ++i) ucvector_push_back(&data, compressed_data.data[i]); } ucvector_cleanup(&compressed_data); - } - else /*not compressed*/ - { + } else /*not compressed*/ { for(i = 0; textstring[i] != 0; ++i) ucvector_push_back(&data, (unsigned char)textstring[i]); } @@ -5145,41 +5173,30 @@ static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* ke return error; } -static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info) -{ - unsigned error = 0; - ucvector bKGD; - ucvector_init(&bKGD); - if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r >> 8)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_r & 255)); +static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info) { + unsigned char data[6]; + size_t size = 0; + if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) { + data[0] = (unsigned char)(info->background_r >> 8); + data[1] = (unsigned char)(info->background_r & 255); + size = 2; + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) { + data[0] = (unsigned char)(info->background_r >> 8); + data[1] = (unsigned char)(info->background_r & 255); + data[2] = (unsigned char)(info->background_g >> 8); + data[3] = (unsigned char)(info->background_g & 255); + data[4] = (unsigned char)(info->background_b >> 8); + data[5] = (unsigned char)(info->background_b & 255); + size = 6; + } else if(info->color.colortype == LCT_PALETTE) { + data[0] =(unsigned char)(info->background_r & 255); /*palette index*/ + size = 1; } - else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r >> 8)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_r & 255)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_g >> 8)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_g & 255)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_b >> 8)); - ucvector_push_back(&bKGD, (unsigned char)(info->background_b & 255)); - } - else if(info->color.colortype == LCT_PALETTE) - { - ucvector_push_back(&bKGD, (unsigned char)(info->background_r & 255)); /*palette index*/ - } - - error = addChunk(out, "bKGD", bKGD.data, bKGD.size); - ucvector_cleanup(&bKGD); - - return error; + return addChunk(out, "bKGD", data, size); } -static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) -{ - unsigned error = 0; - unsigned char* data = (unsigned char*)lodepng_malloc(7); - if(!data) return 83; /*alloc fail*/ +static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) { + unsigned char data[7]; data[0] = (unsigned char)(time->year >> 8); data[1] = (unsigned char)(time->year & 255); data[2] = (unsigned char)time->month; @@ -5187,35 +5204,70 @@ static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) data[4] = (unsigned char)time->hour; data[5] = (unsigned char)time->minute; data[6] = (unsigned char)time->second; - error = addChunk(out, "tIME", data, 7); - lodepng_free(data); - return error; + return addChunk(out, "tIME", data, sizeof(data)); } -static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info) -{ +static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info) { + unsigned char data[9]; + lodepng_set32bitInt(data + 0, info->phys_x); + lodepng_set32bitInt(data + 4, info->phys_y); data[8] = info->phys_unit; + return addChunk(out, "pHYs", data, sizeof(data)); +} + +static unsigned addChunk_gAMA(ucvector* out, const LodePNGInfo* info) { + unsigned char data[4]; + lodepng_set32bitInt(data, info->gama_gamma); + return addChunk(out, "gAMA", data, sizeof(data)); +} + +static unsigned addChunk_cHRM(ucvector* out, const LodePNGInfo* info) { + unsigned char data[32]; + lodepng_set32bitInt(data + 0, info->chrm_white_x); + lodepng_set32bitInt(data + 4, info->chrm_white_y); + lodepng_set32bitInt(data + 8, info->chrm_red_x); + lodepng_set32bitInt(data + 12, info->chrm_red_y); + lodepng_set32bitInt(data + 16, info->chrm_green_x); + lodepng_set32bitInt(data + 20, info->chrm_green_y); + lodepng_set32bitInt(data + 24, info->chrm_blue_x); + lodepng_set32bitInt(data + 28, info->chrm_blue_y); + return addChunk(out, "cHRM", data, sizeof(data)); +} + +static unsigned addChunk_sRGB(ucvector* out, const LodePNGInfo* info) { + unsigned char data = info->srgb_intent; + return addChunk(out, "sRGB", &data, 1); +} + +static unsigned addChunk_iCCP(ucvector* out, const LodePNGInfo* info, LodePNGCompressSettings* zlibsettings) { unsigned error = 0; - ucvector data; + ucvector data, compressed; + size_t i; + ucvector_init(&data); + ucvector_init(&compressed); + for(i = 0; info->iccp_name[i] != 0; ++i) ucvector_push_back(&data, (unsigned char)info->iccp_name[i]); + if(i < 1 || i > 79) return 89; /*error: invalid keyword size*/ + ucvector_push_back(&data, 0); /*0 termination char*/ + ucvector_push_back(&data, 0); /*compression method: 0*/ - lodepng_add32bitInt(&data, info->phys_x); - lodepng_add32bitInt(&data, info->phys_y); - ucvector_push_back(&data, info->phys_unit); + error = zlib_compress(&compressed.data, &compressed.size, + info->iccp_profile, info->iccp_profile_size, zlibsettings); + if(!error) { + for(i = 0; i != compressed.size; ++i) ucvector_push_back(&data, compressed.data[i]); + error = addChunk(out, "iCCP", data.data, data.size); + } - error = addChunk(out, "pHYs", data.data, data.size); + ucvector_cleanup(&compressed); ucvector_cleanup(&data); - return error; } #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline, - size_t length, size_t bytewidth, unsigned char filterType) -{ + size_t length, size_t bytewidth, unsigned char filterType) { size_t i; - switch(filterType) - { + switch(filterType) { case 0: /*None*/ for(i = 0; i != length; ++i) out[i] = scanline[i]; break; @@ -5224,71 +5276,61 @@ static void filterScanline(unsigned char* out, const unsigned char* scanline, co for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - scanline[i - bytewidth]; break; case 2: /*Up*/ - if(prevline) - { + if(prevline) { for(i = 0; i != length; ++i) out[i] = scanline[i] - prevline[i]; - } - else - { + } else { for(i = 0; i != length; ++i) out[i] = scanline[i]; } break; case 3: /*Average*/ - if(prevline) - { + if(prevline) { for(i = 0; i != bytewidth; ++i) out[i] = scanline[i] - (prevline[i] >> 1); for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) >> 1); - } - else - { + } else { for(i = 0; i != bytewidth; ++i) out[i] = scanline[i]; for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - (scanline[i - bytewidth] >> 1); } break; case 4: /*Paeth*/ - if(prevline) - { + if(prevline) { /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/ for(i = 0; i != bytewidth; ++i) out[i] = (scanline[i] - prevline[i]); - for(i = bytewidth; i < length; ++i) - { + for(i = bytewidth; i < length; ++i) { out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth])); } - } - else - { + } else { for(i = 0; i != bytewidth; ++i) out[i] = scanline[i]; /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/ for(i = bytewidth; i < length; ++i) out[i] = (scanline[i] - scanline[i - bytewidth]); } break; - default: return; /*unexisting filter type given*/ + default: return; /*nonexistent filter type given*/ } } -/* log2 approximation. A slight bit faster than std::log. */ -static float flog2(float f) -{ - float result = 0; - while(f > 32) { result += 4; f /= 16; } - while(f > 2) { ++result; f /= 2; } - return result + 1.442695f * (f * f * f / 3 - 3 * f * f / 2 + 3 * f - 1.83333f); +/* integer binary logarithm */ +static size_t ilog2(size_t i) { + size_t result = 0; + while(i >= 65536) { result += 16; i >>= 16; } + while(i >= 256) { result += 8; i >>= 8; } + while(i >= 16) { result += 4; i >>= 4; } + while(i >= 2) { result += 1; i >>= 1; } + return result; } static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, - const LodePNGColorMode* info, const LodePNGEncoderSettings* settings) -{ + const LodePNGColorMode* info, const LodePNGEncoderSettings* settings) { /* For PNG filter method 0 - out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are + out must be a buffer with as size: h + (w * h * bpp + 7u) / 8u, because there are the scanlines with 1 extra byte per scanline */ unsigned bpp = lodepng_get_bpp(info); /*the width of a scanline in bytes, not including the filter type*/ - size_t linebytes = (w * bpp + 7) / 8; + size_t linebytes = (w * bpp + 7u) / 8u; /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ - size_t bytewidth = (bpp + 7) / 8; + size_t bytewidth = (bpp + 7u) / 8u; const unsigned char* prevline = 0; unsigned x, y; unsigned error = 0; @@ -5312,50 +5354,39 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, if(bpp == 0) return 31; /*error: invalid color type*/ - if(strategy == LFS_ZERO) - { - for(y = 0; y != h; ++y) - { + if(strategy >= LFS_ZERO && strategy <= LFS_FOUR) { + unsigned char type = (unsigned char)strategy; + for(y = 0; y != h; ++y) { size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ size_t inindex = linebytes * y; - out[outindex] = 0; /*filter type byte*/ - filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, 0); + out[outindex] = type; /*filter type byte*/ + filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type); prevline = &in[inindex]; } - } - else if(strategy == LFS_MINSUM) - { + } else if(strategy == LFS_MINSUM) { /*adaptive filtering*/ size_t sum[5]; unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/ size_t smallest = 0; unsigned char type, bestType = 0; - for(type = 0; type != 5; ++type) - { + for(type = 0; type != 5; ++type) { attempt[type] = (unsigned char*)lodepng_malloc(linebytes); if(!attempt[type]) return 83; /*alloc fail*/ } - if(!error) - { - for(y = 0; y != h; ++y) - { + if(!error) { + for(y = 0; y != h; ++y) { /*try the 5 filter types*/ - for(type = 0; type != 5; ++type) - { + for(type = 0; type != 5; ++type) { filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type); /*calculate the sum of the result*/ sum[type] = 0; - if(type == 0) - { + if(type == 0) { for(x = 0; x != linebytes; ++x) sum[type] += (unsigned char)(attempt[type][x]); - } - else - { - for(x = 0; x != linebytes; ++x) - { + } else { + for(x = 0; x != linebytes; ++x) { /*For differences, each byte should be treated as signed, values above 127 are negative (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there. This means filtertype 0 is almost never chosen, but that is justified.*/ @@ -5365,8 +5396,7 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, } /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ - if(type == 0 || sum[type] < smallest) - { + if(type == 0 || sum[type] < smallest) { bestType = type; smallest = sum[type]; } @@ -5381,41 +5411,33 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, } for(type = 0; type != 5; ++type) lodepng_free(attempt[type]); - } - else if(strategy == LFS_ENTROPY) - { - float sum[5]; + } else if(strategy == LFS_ENTROPY) { + size_t sum[5]; unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/ - float smallest = 0; + size_t bestSum = 0; unsigned type, bestType = 0; unsigned count[256]; - for(type = 0; type != 5; ++type) - { + for(type = 0; type != 5; ++type) { attempt[type] = (unsigned char*)lodepng_malloc(linebytes); if(!attempt[type]) return 83; /*alloc fail*/ } - for(y = 0; y != h; ++y) - { + for(y = 0; y != h; ++y) { /*try the 5 filter types*/ - for(type = 0; type != 5; ++type) - { + for(type = 0; type != 5; ++type) { filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type); for(x = 0; x != 256; ++x) count[x] = 0; for(x = 0; x != linebytes; ++x) ++count[attempt[type][x]]; ++count[type]; /*the filter type itself is part of the scanline*/ sum[type] = 0; - for(x = 0; x != 256; ++x) - { - float p = count[x] / (float)(linebytes + 1); - sum[type] += count[x] == 0 ? 0 : flog2(1 / p) * p; + for(x = 0; x != 256; ++x) { + sum[type] += count[x] == 0 ? 0 : ilog2(count[x]) * count[x]; } /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ - if(type == 0 || sum[type] < smallest) - { + if(type == 0 || sum[type] > bestSum) { bestType = type; - smallest = sum[type]; + bestSum = sum[type]; } } @@ -5427,11 +5449,8 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, } for(type = 0; type != 5; ++type) lodepng_free(attempt[type]); - } - else if(strategy == LFS_PREDEFINED) - { - for(y = 0; y != h; ++y) - { + } else if(strategy == LFS_PREDEFINED) { + for(y = 0; y != h; ++y) { size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ size_t inindex = linebytes * y; unsigned char type = settings->predefined_filters[y]; @@ -5439,9 +5458,7 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type); prevline = &in[inindex]; } - } - else if(strategy == LFS_BRUTE_FORCE) - { + } else if(strategy == LFS_BRUTE_FORCE) { /*brute force filter chooser. deflate the scanline after every filter attempt to see which one deflates best. This is very slow and gives only slightly smaller, sometimes even larger, result*/ @@ -5460,15 +5477,12 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, images only, so disable it*/ zlibsettings.custom_zlib = 0; zlibsettings.custom_deflate = 0; - for(type = 0; type != 5; ++type) - { + for(type = 0; type != 5; ++type) { attempt[type] = (unsigned char*)lodepng_malloc(linebytes); if(!attempt[type]) return 83; /*alloc fail*/ } - for(y = 0; y != h; ++y) /*try the 5 filter types*/ - { - for(type = 0; type != 5; ++type) - { + for(y = 0; y != h; ++y) /*try the 5 filter types*/ { + for(type = 0; type != 5; ++type) { unsigned testsize = (unsigned)linebytes; /*if(testsize > 8) testsize /= 8;*/ /*it already works good enough by testing a part of the row*/ @@ -5478,8 +5492,7 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, zlib_compress(&dummy, &size[type], attempt[type], testsize, &zlibsettings); lodepng_free(dummy); /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/ - if(type == 0 || size[type] < smallest) - { + if(type == 0 || size[type] < smallest) { bestType = type; smallest = size[type]; } @@ -5496,18 +5509,15 @@ static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, } static void addPaddingBits(unsigned char* out, const unsigned char* in, - size_t olinebits, size_t ilinebits, unsigned h) -{ + size_t olinebits, size_t ilinebits, unsigned h) { /*The opposite of the removePaddingBits function olinebits must be >= ilinebits*/ unsigned y; size_t diff = olinebits - ilinebits; size_t obp = 0, ibp = 0; /*bit pointers*/ - for(y = 0; y != h; ++y) - { + for(y = 0; y != h; ++y) { size_t x; - for(x = 0; x < ilinebits; ++x) - { + for(x = 0; x < ilinebits; ++x) { unsigned char bit = readBitFromReversedStream(&ibp, in); setBitOfReversedStream(&obp, out, bit); } @@ -5528,47 +5538,37 @@ in has the following size in bits: w * h * bpp. out is possibly bigger due to padding bits between reduced images NOTE: comments about padding bits are only relevant if bpp < 8 */ -static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ +static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; unsigned i; Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - if(bpp >= 8) - { - for(i = 0; i != 7; ++i) - { + if(bpp >= 8) { + for(i = 0; i != 7; ++i) { unsigned x, y, b; - size_t bytewidth = bpp / 8; + size_t bytewidth = bpp / 8u; for(y = 0; y < passh[i]; ++y) - for(x = 0; x < passw[i]; ++x) - { + for(x = 0; x < passw[i]; ++x) { size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth; - for(b = 0; b < bytewidth; ++b) - { + for(b = 0; b < bytewidth; ++b) { out[pixeloutstart + b] = in[pixelinstart + b]; } } } - } - else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ - { - for(i = 0; i != 7; ++i) - { + } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ { + for(i = 0; i != 7; ++i) { unsigned x, y, b; unsigned ilinebits = bpp * passw[i]; unsigned olinebits = bpp * w; size_t obp, ibp; /*bit pointers (for out and in buffer)*/ for(y = 0; y < passh[i]; ++y) - for(x = 0; x < passw[i]; ++x) - { + for(x = 0; x < passw[i]; ++x) { ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; obp = (8 * passstart[i]) + (y * ilinebits + x * bpp); - for(b = 0; b < bpp; ++b) - { + for(b = 0; b < bpp; ++b) { unsigned char bit = readBitFromReversedStream(&ibp, in); setBitOfReversedStream(&obp, out, bit); } @@ -5581,45 +5581,36 @@ static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigne return value is error**/ static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in, unsigned w, unsigned h, - const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings) -{ + const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings) { /* This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps: - *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter + *) if no Adam7: 1) add padding bits (= possible extra bits per scanline if bpp < 8) 2) filter *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter */ unsigned bpp = lodepng_get_bpp(&info_png->color); unsigned error = 0; - if(info_png->interlace_method == 0) - { - *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/ + if(info_png->interlace_method == 0) { + *outsize = h + (h * ((w * bpp + 7u) / 8u)); /*image size plus an extra byte per scanline + possible padding bits*/ *out = (unsigned char*)lodepng_malloc(*outsize); if(!(*out) && (*outsize)) error = 83; /*alloc fail*/ - if(!error) - { + if(!error) { /*non multiple of 8 bits per scanline, padding bits needed per scanline*/ - if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) - { - unsigned char* padded = (unsigned char*)lodepng_malloc(h * ((w * bpp + 7) / 8)); + if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) { + unsigned char* padded = (unsigned char*)lodepng_malloc(h * ((w * bpp + 7u) / 8u)); if(!padded) error = 83; /*alloc fail*/ - if(!error) - { - addPaddingBits(padded, in, ((w * bpp + 7) / 8) * 8, w * bpp, h); + if(!error) { + addPaddingBits(padded, in, ((w * bpp + 7u) / 8u) * 8u, w * bpp, h); error = filter(*out, padded, w, h, &info_png->color, settings); } lodepng_free(padded); - } - else - { + } else { /*we can immediately filter into the out buffer, no other steps needed*/ error = filter(*out, in, w, h, &info_png->color, settings); } } - } - else /*interlace_method is 1 (Adam7)*/ - { + } else /*interlace_method is 1 (Adam7)*/ { unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; unsigned char* adam7; @@ -5633,25 +5624,20 @@ static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const adam7 = (unsigned char*)lodepng_malloc(passstart[7]); if(!adam7 && passstart[7]) error = 83; /*alloc fail*/ - if(!error) - { + if(!error) { unsigned i; Adam7_interlace(adam7, in, w, h, bpp); - for(i = 0; i != 7; ++i) - { - if(bpp < 8) - { + for(i = 0; i != 7; ++i) { + if(bpp < 8) { unsigned char* padded = (unsigned char*)lodepng_malloc(padded_passstart[i + 1] - padded_passstart[i]); if(!padded) ERROR_BREAK(83); /*alloc fail*/ addPaddingBits(padded, &adam7[passstart[i]], - ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]); + ((passw[i] * bpp + 7u) / 8u) * 8u, passw[i] * bpp, passh[i]); error = filter(&(*out)[filter_passstart[i]], padded, passw[i], passh[i], &info_png->color, settings); lodepng_free(padded); - } - else - { + } else { error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]], passw[i], passh[i], &info_png->color, settings); } @@ -5672,15 +5658,12 @@ returns 0 if the palette is opaque, returns 1 if the palette has a single color with alpha 0 ==> color key returns 2 if the palette is semi-translucent. */ -static unsigned getPaletteTranslucency(const unsigned char* palette, size_t palettesize) -{ +static unsigned getPaletteTranslucency(const unsigned char* palette, size_t palettesize) { size_t i; unsigned key = 0; unsigned r = 0, g = 0, b = 0; /*the value of the color with alpha 0, so long as color keying is possible*/ - for(i = 0; i != palettesize; ++i) - { - if(!key && palette[4 * i + 3] == 0) - { + for(i = 0; i != palettesize; ++i) { + if(!key && palette[4 * i + 3] == 0) { r = palette[4 * i + 0]; g = palette[4 * i + 1]; b = palette[4 * i + 2]; key = 1; i = (size_t)(-1); /*restart from beginning, to detect earlier opaque colors with key's value*/ @@ -5693,27 +5676,48 @@ static unsigned getPaletteTranslucency(const unsigned char* palette, size_t pale } #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) -{ +static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) { unsigned char* inchunk = data; - while((size_t)(inchunk - data) < datasize) - { + while((size_t)(inchunk - data) < datasize) { CERROR_TRY_RETURN(lodepng_chunk_append(&out->data, &out->size, inchunk)); out->allocsize = out->size; /*fix the allocsize again*/ inchunk = lodepng_chunk_next(inchunk); } return 0; } + +static unsigned isGrayICCProfile(const unsigned char* profile, unsigned size) { + /* + It is a gray profile if bytes 16-19 are "GRAY", rgb profile if bytes 16-19 + are "RGB ". We do not perform any full parsing of the ICC profile here, other + than check those 4 bytes to grayscale profile. Other than that, validity of + the profile is not checked. This is needed only because the PNG specification + requires using a non-gray color model if there is an ICC profile with "RGB " + (sadly limiting compression opportunities if the input data is grayscale RGB + data), and requires using a gray color model if it is "GRAY". + */ + if(size < 20) return 0; + return profile[16] == 'G' && profile[17] == 'R' && profile[18] == 'A' && profile[19] == 'Y'; +} + +static unsigned isRGBICCProfile(const unsigned char* profile, unsigned size) { + /* See comment in isGrayICCProfile*/ + if(size < 20) return 0; + return profile[16] == 'R' && profile[17] == 'G' && profile[18] == 'B' && profile[19] == ' '; +} #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ unsigned lodepng_encode(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h, - LodePNGState* state) -{ - LodePNGInfo info; - ucvector outv; + LodePNGState* state) { unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/ size_t datasize = 0; + ucvector outv; + LodePNGInfo info; + const LodePNGInfo* info_png = &state->info_png; + + ucvector_init(&outv); + lodepng_info_init(&info); /*provide some proper output values if error will happen*/ *out = 0; @@ -5721,54 +5725,98 @@ unsigned lodepng_encode(unsigned char** out, size_t* outsize, state->error = 0; /*check input values validity*/ - if((state->info_png.color.colortype == LCT_PALETTE || state->encoder.force_palette) - && (state->info_png.color.palettesize == 0 || state->info_png.color.palettesize > 256)) - { - CERROR_RETURN_ERROR(state->error, 68); /*invalid palette size, it is only allowed to be 1-256*/ + if((info_png->color.colortype == LCT_PALETTE || state->encoder.force_palette) + && (info_png->color.palettesize == 0 || info_png->color.palettesize > 256)) { + state->error = 68; /*invalid palette size, it is only allowed to be 1-256*/ + goto cleanup; } - if(state->encoder.zlibsettings.btype > 2) - { - CERROR_RETURN_ERROR(state->error, 61); /*error: unexisting btype*/ + if(state->encoder.zlibsettings.btype > 2) { + state->error = 61; /*error: nonexistent btype*/ + goto cleanup; } - if(state->info_png.interlace_method > 1) - { - CERROR_RETURN_ERROR(state->error, 71); /*error: unexisting interlace mode*/ + if(info_png->interlace_method > 1) { + state->error = 71; /*error: nonexistent interlace mode*/ + goto cleanup; } - state->error = checkColorValidity(state->info_png.color.colortype, state->info_png.color.bitdepth); - if(state->error) return state->error; /*error: unexisting color type given*/ + state->error = checkColorValidity(info_png->color.colortype, info_png->color.bitdepth); + if(state->error) goto cleanup; /*error: nonexistent color type given*/ state->error = checkColorValidity(state->info_raw.colortype, state->info_raw.bitdepth); - if(state->error) return state->error; /*error: unexisting color type given*/ + if(state->error) goto cleanup; /*error: nonexistent color type given*/ /* color convert and compute scanline filter types */ - lodepng_info_init(&info); lodepng_info_copy(&info, &state->info_png); - if(state->encoder.auto_convert) - { - state->error = lodepng_auto_choose_color(&info.color, image, w, h, &state->info_raw); - } - if (!state->error) - { - if(!lodepng_color_mode_equal(&state->info_raw, &info.color)) - { - unsigned char* converted; - size_t size = ((size_t)w * (size_t)h * (size_t)lodepng_get_bpp(&info.color) + 7) / 8; - - converted = (unsigned char*)lodepng_malloc(size); - if(!converted && size) state->error = 83; /*alloc fail*/ - if(!state->error) - { - state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h); - } - if(!state->error) preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder); - lodepng_free(converted); + if(state->encoder.auto_convert) { + LodePNGColorStats stats; + lodepng_color_stats_init(&stats); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->iccp_defined && + isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) { + /*the PNG specification does not allow to use palette with a GRAY ICC profile, even + if the palette has only gray colors, so disallow it.*/ + stats.allow_palette = 0; } - else preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder); + if(info_png->iccp_defined && + isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) { + /*the PNG specification does not allow to use grayscale color with RGB ICC profile, so disallow gray.*/ + stats.allow_greyscale = 0; + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ + lodepng_compute_color_stats(&stats, image, w, h, &state->info_raw); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->background_defined) { + /*the background chunk's color must be taken into account as well*/ + unsigned r = 0, g = 0, b = 0; + LodePNGColorMode mode16 = lodepng_color_mode_make(LCT_RGB, 16); + lodepng_convert_rgb(&r, &g, &b, info_png->background_r, info_png->background_g, info_png->background_b, &mode16, &info_png->color); + lodepng_color_stats_add(&stats, r, g, b, 65535); + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ + state->error = auto_choose_color(&info.color, &state->info_raw, &stats); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*also convert the background chunk*/ + if(info_png->background_defined) { + if(lodepng_convert_rgb(&info.background_r, &info.background_g, &info.background_b, + info_png->background_r, info_png->background_g, info_png->background_b, &info.color, &info_png->color)) { + state->error = 104; + goto cleanup; + } + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ } +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->iccp_defined) { + unsigned gray_icc = isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size); + unsigned rgb_icc = isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size); + unsigned gray_png = info.color.colortype == LCT_GREY || info.color.colortype == LCT_GREY_ALPHA; + if(!gray_icc && !rgb_icc) { + state->error = 100; /* Disallowed profile color type for PNG */ + goto cleanup; + } + if(gray_icc != gray_png) { + /*Not allowed to use RGB/RGBA/palette with GRAY ICC profile or vice versa, + or in case of auto_convert, it wasn't possible to find appropriate model*/ + state->error = state->encoder.auto_convert ? 102 : 101; + goto cleanup; + } + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + if(!lodepng_color_mode_equal(&state->info_raw, &info.color)) { + unsigned char* converted; + size_t size = ((size_t)w * (size_t)h * (size_t)lodepng_get_bpp(&info.color) + 7u) / 8u; - /* output all PNG chunks */ - ucvector_init(&outv); - while(!state->error) /*while only executed once, to break on error*/ - { + converted = (unsigned char*)lodepng_malloc(size); + if(!converted && size) state->error = 83; /*alloc fail*/ + if(!state->error) { + state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h); + } + if(!state->error) preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder); + lodepng_free(converted); + if(state->error) goto cleanup; + } + else preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder); + + /* output all PNG chunks */ { #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS size_t i; #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ @@ -5778,100 +5826,92 @@ unsigned lodepng_encode(unsigned char** out, size_t* outsize, addChunk_IHDR(&outv, w, h, info.color.colortype, info.color.bitdepth, info.interlace_method); #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS /*unknown chunks between IHDR and PLTE*/ - if(info.unknown_chunks_data[0]) - { + if(info.unknown_chunks_data[0]) { state->error = addUnknownChunks(&outv, info.unknown_chunks_data[0], info.unknown_chunks_size[0]); - if(state->error) break; + if(state->error) goto cleanup; } + /*color profile chunks must come before PLTE */ + if(info.iccp_defined) addChunk_iCCP(&outv, &info, &state->encoder.zlibsettings); + if(info.srgb_defined) addChunk_sRGB(&outv, &info); + if(info.gama_defined) addChunk_gAMA(&outv, &info); + if(info.chrm_defined) addChunk_cHRM(&outv, &info); #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ /*PLTE*/ - if(info.color.colortype == LCT_PALETTE) - { + if(info.color.colortype == LCT_PALETTE) { addChunk_PLTE(&outv, &info.color); } - if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA)) - { + if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA)) { addChunk_PLTE(&outv, &info.color); } /*tRNS*/ - if(info.color.colortype == LCT_PALETTE && getPaletteTranslucency(info.color.palette, info.color.palettesize) != 0) - { + if(info.color.colortype == LCT_PALETTE && getPaletteTranslucency(info.color.palette, info.color.palettesize) != 0) { addChunk_tRNS(&outv, &info.color); } - if((info.color.colortype == LCT_GREY || info.color.colortype == LCT_RGB) && info.color.key_defined) - { + if((info.color.colortype == LCT_GREY || info.color.colortype == LCT_RGB) && info.color.key_defined) { addChunk_tRNS(&outv, &info.color); } #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS /*bKGD (must come between PLTE and the IDAt chunks*/ - if(info.background_defined) addChunk_bKGD(&outv, &info); + if(info.background_defined) { + state->error = addChunk_bKGD(&outv, &info); + if(state->error) goto cleanup; + } /*pHYs (must come before the IDAT chunks)*/ if(info.phys_defined) addChunk_pHYs(&outv, &info); /*unknown chunks between PLTE and IDAT*/ - if(info.unknown_chunks_data[1]) - { + if(info.unknown_chunks_data[1]) { state->error = addUnknownChunks(&outv, info.unknown_chunks_data[1], info.unknown_chunks_size[1]); - if(state->error) break; + if(state->error) goto cleanup; } #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ /*IDAT (multiple IDAT chunks must be consecutive)*/ state->error = addChunk_IDAT(&outv, data, datasize, &state->encoder.zlibsettings); - if(state->error) break; + if(state->error) goto cleanup; #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS /*tIME*/ if(info.time_defined) addChunk_tIME(&outv, &info.time); /*tEXt and/or zTXt*/ - for(i = 0; i != info.text_num; ++i) - { - if(strlen(info.text_keys[i]) > 79) - { + for(i = 0; i != info.text_num; ++i) { + if(lodepng_strlen(info.text_keys[i]) > 79) { state->error = 66; /*text chunk too large*/ - break; + goto cleanup; } - if(strlen(info.text_keys[i]) < 1) - { + if(lodepng_strlen(info.text_keys[i]) < 1) { state->error = 67; /*text chunk too small*/ - break; + goto cleanup; } - if(state->encoder.text_compression) - { + if(state->encoder.text_compression) { addChunk_zTXt(&outv, info.text_keys[i], info.text_strings[i], &state->encoder.zlibsettings); - } - else - { + } else { addChunk_tEXt(&outv, info.text_keys[i], info.text_strings[i]); } } /*LodePNG version id in text chunk*/ - if(state->encoder.add_id) - { - unsigned alread_added_id_text = 0; - for(i = 0; i != info.text_num; ++i) - { - if(!strcmp(info.text_keys[i], "LodePNG")) - { - alread_added_id_text = 1; + if(state->encoder.add_id) { + unsigned already_added_id_text = 0; + for(i = 0; i != info.text_num; ++i) { + const char* k = info.text_keys[i]; + /* Could use strcmp, but we're not calling or reimplementing this C library function for this use only */ + if(k[0] == 'L' && k[1] == 'o' && k[2] == 'd' && k[3] == 'e' && + k[4] == 'P' && k[5] == 'N' && k[6] == 'G' && k[7] == '\0') { + already_added_id_text = 1; break; } } - if(alread_added_id_text == 0) - { + if(already_added_id_text == 0) { addChunk_tEXt(&outv, "LodePNG", LODEPNG_VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/ } } /*iTXt*/ - for(i = 0; i != info.itext_num; ++i) - { - if(strlen(info.itext_keys[i]) > 79) - { + for(i = 0; i != info.itext_num; ++i) { + if(lodepng_strlen(info.itext_keys[i]) > 79) { state->error = 66; /*text chunk too large*/ - break; + goto cleanup; } - if(strlen(info.itext_keys[i]) < 1) - { + if(lodepng_strlen(info.itext_keys[i]) < 1) { state->error = 67; /*text chunk too small*/ - break; + goto cleanup; } addChunk_iTXt(&outv, state->encoder.text_compression, info.itext_keys[i], info.itext_langtags[i], info.itext_transkeys[i], info.itext_strings[i], @@ -5879,19 +5919,18 @@ unsigned lodepng_encode(unsigned char** out, size_t* outsize, } /*unknown chunks between IDAT and IEND*/ - if(info.unknown_chunks_data[2]) - { + if(info.unknown_chunks_data[2]) { state->error = addUnknownChunks(&outv, info.unknown_chunks_data[2], info.unknown_chunks_size[2]); - if(state->error) break; + if(state->error) goto cleanup; } #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ addChunk_IEND(&outv); - - break; /*this isn't really a while loop; no error happened so break out now!*/ } +cleanup: lodepng_info_cleanup(&info); lodepng_free(data); + /*instead of cleaning the vector up, give it to the output*/ *out = outv.data; *outsize = outv.size; @@ -5900,8 +5939,7 @@ unsigned lodepng_encode(unsigned char** out, size_t* outsize, } unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsigned char* image, - unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) -{ + unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) { unsigned error; LodePNGState state; lodepng_state_init(&state); @@ -5915,20 +5953,17 @@ unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsig return error; } -unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) -{ +unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) { return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGBA, 8); } -unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) -{ +unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) { return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGB, 8); } #ifdef LODEPNG_COMPILE_DISK unsigned lodepng_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { unsigned char* buffer; size_t buffersize; unsigned error = lodepng_encode_memory(&buffer, &buffersize, image, w, h, colortype, bitdepth); @@ -5937,19 +5972,16 @@ unsigned lodepng_encode_file(const char* filename, const unsigned char* image, u return error; } -unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) -{ +unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) { return lodepng_encode_file(filename, image, w, h, LCT_RGBA, 8); } -unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) -{ +unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) { return lodepng_encode_file(filename, image, w, h, LCT_RGB, 8); } #endif /*LODEPNG_COMPILE_DISK*/ -void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) -{ +void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) { lodepng_compress_settings_init(&settings->zlibsettings); settings->filter_palette_zero = 1; settings->filter_strategy = LFS_MINSUM; @@ -5970,10 +6002,8 @@ void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) This returns the description of a numerical error code in English. This is also the documentation of all the error codes. */ -const char* lodepng_error_text(unsigned code) -{ - switch(code) - { +const char* lodepng_error_text(unsigned code) { + switch(code) { case 0: return "no error, everything went ok"; case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/ case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/ @@ -5981,16 +6011,17 @@ const char* lodepng_error_text(unsigned code) case 13: return "problem while processing dynamic deflate block"; case 14: return "problem while processing dynamic deflate block"; case 15: return "problem while processing dynamic deflate block"; - case 16: return "unexisting code while processing dynamic deflate block"; + case 16: return "nonexistent code while processing dynamic deflate block"; case 17: return "end of out buffer memory reached while inflating"; case 18: return "invalid distance code while inflating"; case 19: return "end of out buffer memory reached while inflating"; case 20: return "invalid deflate block BTYPE encountered while decoding"; case 21: return "NLEN is not ones complement of LEN in a deflate block"; - /*end of out buffer memory reached while inflating: - This can happen if the inflated deflate data is longer than the amount of bytes required to fill up - all the pixels of the image, given the color depth and image dimensions. Something that doesn't - happen in a normal, well encoded, PNG image.*/ + + /*end of out buffer memory reached while inflating: + This can happen if the inflated deflate data is longer than the amount of bytes required to fill up + all the pixels of the image, given the color depth and image dimensions. Something that doesn't + happen in a normal, well encoded, PNG image.*/ case 22: return "end of out buffer memory reached while inflating"; case 23: return "end of in buffer memory reached while inflating"; case 24: return "invalid FCHECK in zlib header"; @@ -6008,13 +6039,13 @@ const char* lodepng_error_text(unsigned code) case 35: return "chunk length of a chunk is too large or the chunk too small"; case 36: return "illegal PNG filter type encountered"; case 37: return "illegal bit depth for this color type given"; - case 38: return "the palette is too big"; /*more than 256 colors*/ - case 39: return "more palette alpha values given in tRNS chunk than there are colors in the palette"; - case 40: return "tRNS chunk has wrong size for greyscale image"; + case 38: return "the palette is too small or too big"; /*0, or more than 256 colors*/ + case 39: return "tRNS chunk before PLTE or has more entries than palette size"; + case 40: return "tRNS chunk has wrong size for grayscale image"; case 41: return "tRNS chunk has wrong size for RGB image"; case 42: return "tRNS chunk appeared while it was not allowed for this color type"; case 43: return "bKGD chunk has wrong size for palette image"; - case 44: return "bKGD chunk has wrong size for greyscale image"; + case 44: return "bKGD chunk has wrong size for grayscale image"; case 45: return "bKGD chunk has wrong size for RGB image"; case 48: return "empty input buffer given to decoder. Maybe caused by non-existing file?"; case 49: return "jumped past memory while generating dynamic huffman tree"; @@ -6025,7 +6056,7 @@ const char* lodepng_error_text(unsigned code) case 54: return "repeat symbol in tree while there was no value symbol yet"; /*jumped past tree while generating huffman tree, this could be when the tree will have more leaves than symbols after generating it out of the - given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib.*/ + given lengths. They call this an oversubscribed dynamic bit lengths tree in zlib.*/ case 55: return "jumped past tree while generating huffman tree"; case 56: return "given output image colortype or bitdepth not supported for color conversion"; case 57: return "invalid CRC encountered (checking CRC can be disabled)"; @@ -6033,17 +6064,18 @@ const char* lodepng_error_text(unsigned code) case 59: return "requested color conversion not supported"; case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)"; case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)"; - /*LodePNG leaves the choice of RGB to greyscale conversion formula to the user.*/ - case 62: return "conversion from color to greyscale not supported"; - case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; /*(2^31-1)*/ + /*LodePNG leaves the choice of RGB to grayscale conversion formula to the user.*/ + case 62: return "conversion from color to grayscale not supported"; + /*(2^31-1)*/ + case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/ case 64: return "the length of the END symbol 256 in the Huffman tree is 0"; case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes"; case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte"; case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors"; case 69: return "unknown chunk type with 'critical' flag encountered by the decoder"; - case 71: return "unexisting interlace mode given to encoder (must be 0 or 1)"; - case 72: return "while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0)"; + case 71: return "nonexistent interlace mode given to encoder (must be 0 or 1)"; + case 72: return "while decoding, nonexistent compression method encountering in zTXt or iTXt chunk (it must be 0)"; case 73: return "invalid tIME chunk size"; case 74: return "invalid pHYs chunk size"; /*length could be wrong, or data chopped off*/ @@ -6054,7 +6086,7 @@ const char* lodepng_error_text(unsigned code) case 79: return "failed to open file for writing"; case 80: return "tried creating a tree of 0 symbols"; case 81: return "lazy matching at pos 0 is impossible"; - case 82: return "color conversion to palette requested while a color isn't in palette"; + case 82: return "color conversion to palette requested while a color isn't in palette, or index out of bounds"; case 83: return "memory allocation failed"; case 84: return "given image too small to contain all pixels to be encoded"; case 86: return "impossible offset in lz77 encoding (internal bug)"; @@ -6068,6 +6100,16 @@ const char* lodepng_error_text(unsigned code) case 93: return "zero width or height is invalid"; case 94: return "header chunk must have a size of 13 bytes"; case 95: return "integer overflow with combined idat chunk size"; + case 96: return "invalid gAMA chunk size"; + case 97: return "invalid cHRM chunk size"; + case 98: return "invalid sRGB chunk size"; + case 99: return "invalid sRGB rendering intent"; + case 100: return "invalid ICC profile color type, the PNG specification only allows RGB or GRAY"; + case 101: return "PNG specification does not allow RGB ICC profile on gray color types and vice versa"; + case 102: return "not allowed to set grayscale ICC profile with colored pixels by PNG specification"; + case 103: return "invalid palette index in bKGD chunk. Maybe it came before PLTE chunk?"; + case 104: return "invalid bKGD color while encoding (e.g. palette index out of range)"; + case 105: return "integer overflow of bitsize"; } return "unknown error code"; } @@ -6080,12 +6122,10 @@ const char* lodepng_error_text(unsigned code) /* ////////////////////////////////////////////////////////////////////////// */ #ifdef LODEPNG_COMPILE_CPP -namespace lodepng -{ +namespace lodepng { #ifdef LODEPNG_COMPILE_DISK -unsigned load_file(std::vector& buffer, const std::string& filename) -{ +unsigned load_file(std::vector& buffer, const std::string& filename) { long size = lodepng_filesize(filename.c_str()); if(size < 0) return 78; buffer.resize((size_t)size); @@ -6093,8 +6133,7 @@ unsigned load_file(std::vector& buffer, const std::string& filena } /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ -unsigned save_file(const std::vector& buffer, const std::string& filename) -{ +unsigned save_file(const std::vector& buffer, const std::string& filename) { return lodepng_save_file(buffer.empty() ? 0 : &buffer[0], buffer.size(), filename.c_str()); } #endif /* LODEPNG_COMPILE_DISK */ @@ -6102,13 +6141,11 @@ unsigned save_file(const std::vector& buffer, const std::string& #ifdef LODEPNG_COMPILE_ZLIB #ifdef LODEPNG_COMPILE_DECODER unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, - const LodePNGDecompressSettings& settings) -{ + const LodePNGDecompressSettings& settings) { unsigned char* buffer = 0; size_t buffersize = 0; unsigned error = zlib_decompress(&buffer, &buffersize, in, insize, &settings); - if(buffer) - { + if(buffer) { out.insert(out.end(), &buffer[0], &buffer[buffersize]); lodepng_free(buffer); } @@ -6116,21 +6153,18 @@ unsigned decompress(std::vector& out, const unsigned char* in, si } unsigned decompress(std::vector& out, const std::vector& in, - const LodePNGDecompressSettings& settings) -{ + const LodePNGDecompressSettings& settings) { return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings); } #endif /* LODEPNG_COMPILE_DECODER */ #ifdef LODEPNG_COMPILE_ENCODER unsigned compress(std::vector& out, const unsigned char* in, size_t insize, - const LodePNGCompressSettings& settings) -{ + const LodePNGCompressSettings& settings) { unsigned char* buffer = 0; size_t buffersize = 0; unsigned error = zlib_compress(&buffer, &buffersize, in, insize, &settings); - if(buffer) - { + if(buffer) { out.insert(out.end(), &buffer[0], &buffer[buffersize]); lodepng_free(buffer); } @@ -6138,8 +6172,7 @@ unsigned compress(std::vector& out, const unsigned char* in, size } unsigned compress(std::vector& out, const std::vector& in, - const LodePNGCompressSettings& settings) -{ + const LodePNGCompressSettings& settings) { return compress(out, in.empty() ? 0 : &in[0], in.size(), settings); } #endif /* LODEPNG_COMPILE_ENCODER */ @@ -6148,24 +6181,20 @@ unsigned compress(std::vector& out, const std::vector& out, unsigned& w, unsigned& h, const unsigned char* in, - size_t insize, LodePNGColorType colortype, unsigned bitdepth) -{ + size_t insize, LodePNGColorType colortype, unsigned bitdepth) { unsigned char* buffer; unsigned error = lodepng_decode_memory(&buffer, &w, &h, in, insize, colortype, bitdepth); - if(buffer && !error) - { + if(buffer && !error) { State state; state.info_raw.colortype = colortype; state.info_raw.bitdepth = bitdepth; @@ -6190,19 +6217,16 @@ unsigned decode(std::vector& out, unsigned& w, unsigned& h, const } unsigned decode(std::vector& out, unsigned& w, unsigned& h, - const std::vector& in, LodePNGColorType colortype, unsigned bitdepth) -{ + const std::vector& in, LodePNGColorType colortype, unsigned bitdepth) { return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colortype, bitdepth); } unsigned decode(std::vector& out, unsigned& w, unsigned& h, State& state, - const unsigned char* in, size_t insize) -{ + const unsigned char* in, size_t insize) { unsigned char* buffer = NULL; unsigned error = lodepng_decode(&buffer, &w, &h, &state, in, insize); - if(buffer && !error) - { + if(buffer && !error) { size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw); out.insert(out.end(), &buffer[0], &buffer[buffersize]); } @@ -6212,16 +6236,16 @@ unsigned decode(std::vector& out, unsigned& w, unsigned& h, unsigned decode(std::vector& out, unsigned& w, unsigned& h, State& state, - const std::vector& in) -{ + const std::vector& in) { return decode(out, w, h, state, in.empty() ? 0 : &in[0], in.size()); } #ifdef LODEPNG_COMPILE_DISK unsigned decode(std::vector& out, unsigned& w, unsigned& h, const std::string& filename, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { std::vector buffer; + /* safe output values in case error happens */ + w = h = 0; unsigned error = load_file(buffer, filename); if(error) return error; return decode(out, w, h, buffer, colortype, bitdepth); @@ -6231,13 +6255,11 @@ unsigned decode(std::vector& out, unsigned& w, unsigned& h, const #ifdef LODEPNG_COMPILE_ENCODER unsigned encode(std::vector& out, const unsigned char* in, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { unsigned char* buffer; size_t buffersize; unsigned error = lodepng_encode_memory(&buffer, &buffersize, in, w, h, colortype, bitdepth); - if(buffer) - { + if(buffer) { out.insert(out.end(), &buffer[0], &buffer[buffersize]); lodepng_free(buffer); } @@ -6246,21 +6268,18 @@ unsigned encode(std::vector& out, const unsigned char* in, unsign unsigned encode(std::vector& out, const std::vector& in, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; return encode(out, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); } unsigned encode(std::vector& out, const unsigned char* in, unsigned w, unsigned h, - State& state) -{ + State& state) { unsigned char* buffer; size_t buffersize; unsigned error = lodepng_encode(&buffer, &buffersize, in, w, h, &state); - if(buffer) - { + if(buffer) { out.insert(out.end(), &buffer[0], &buffer[buffersize]); lodepng_free(buffer); } @@ -6269,8 +6288,7 @@ unsigned encode(std::vector& out, unsigned encode(std::vector& out, const std::vector& in, unsigned w, unsigned h, - State& state) -{ + State& state) { if(lodepng_get_raw_size(w, h, &state.info_raw) > in.size()) return 84; return encode(out, in.empty() ? 0 : &in[0], w, h, state); } @@ -6278,8 +6296,7 @@ unsigned encode(std::vector& out, #ifdef LODEPNG_COMPILE_DISK unsigned encode(const std::string& filename, const unsigned char* in, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { std::vector buffer; unsigned error = encode(buffer, in, w, h, colortype, bitdepth); if(!error) error = save_file(buffer, filename); @@ -6288,8 +6305,7 @@ unsigned encode(const std::string& filename, unsigned encode(const std::string& filename, const std::vector& in, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth) -{ + LodePNGColorType colortype, unsigned bitdepth) { if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; return encode(filename, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); } diff --git a/Sources/Emu48/LODEPNG.H b/Sources/Emu48/LODEPNG.H index 6c56c1d..6f09353 100644 --- a/Sources/Emu48/LODEPNG.H +++ b/Sources/Emu48/LODEPNG.H @@ -1,1770 +1,1953 @@ -/* -LodePNG version 20180611 - -Copyright (c) 2005-2018 Lode Vandevenne - -This software is provided 'as-is', without any express or implied -warranty. In no event will the authors be held liable for any damages -arising from the use of this software. - -Permission is granted to anyone to use this software for any purpose, -including commercial applications, and to alter it and redistribute it -freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - - 3. This notice may not be removed or altered from any source - distribution. -*/ - -#ifndef LODEPNG_H -#define LODEPNG_H - -#include /*for size_t*/ - -extern const char* LODEPNG_VERSION_STRING; - -/* -The following #defines are used to create code sections. They can be disabled -to disable code sections, which can give faster compile time and smaller binary. -The "NO_COMPILE" defines are designed to be used to pass as defines to the -compiler command to disable them without modifying this header, e.g. --DLODEPNG_NO_COMPILE_ZLIB for gcc. -In addition to those below, you can also define LODEPNG_NO_COMPILE_CRC to -allow implementing a custom lodepng_crc32. -*/ -/*deflate & zlib. If disabled, you must specify alternative zlib functions in -the custom_zlib field of the compress and decompress settings*/ -#ifndef LODEPNG_NO_COMPILE_ZLIB -#define LODEPNG_COMPILE_ZLIB -#endif -/*png encoder and png decoder*/ -#ifndef LODEPNG_NO_COMPILE_PNG -#define LODEPNG_COMPILE_PNG -#endif -/*deflate&zlib decoder and png decoder*/ -#ifndef LODEPNG_NO_COMPILE_DECODER -#define LODEPNG_COMPILE_DECODER -#endif -/*deflate&zlib encoder and png encoder*/ -#ifndef LODEPNG_NO_COMPILE_ENCODER -#define LODEPNG_COMPILE_ENCODER -#endif -/*the optional built in harddisk file loading and saving functions*/ -#ifndef LODEPNG_NO_COMPILE_DISK -#define LODEPNG_COMPILE_DISK -#endif -/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/ -#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS -#define LODEPNG_COMPILE_ANCILLARY_CHUNKS -#endif -/*ability to convert error numerical codes to English text string*/ -#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT -#define LODEPNG_COMPILE_ERROR_TEXT -#endif -/*Compile the default allocators (C's free, malloc and realloc). If you disable this, -you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your -source files with custom allocators.*/ -#ifndef LODEPNG_NO_COMPILE_ALLOCATORS -#define LODEPNG_COMPILE_ALLOCATORS -#endif -/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/ -#ifdef __cplusplus -#ifndef LODEPNG_NO_COMPILE_CPP -#define LODEPNG_COMPILE_CPP -#endif -#endif - -#ifdef LODEPNG_COMPILE_CPP -#include -#include -#endif /*LODEPNG_COMPILE_CPP*/ - -#ifdef LODEPNG_COMPILE_PNG -/*The PNG color types (also used for raw).*/ -typedef enum LodePNGColorType -{ - LCT_GREY = 0, /*greyscale: 1,2,4,8,16 bit*/ - LCT_RGB = 2, /*RGB: 8,16 bit*/ - LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ - LCT_GREY_ALPHA = 4, /*greyscale with alpha: 8,16 bit*/ - LCT_RGBA = 6 /*RGB with alpha: 8,16 bit*/ -} LodePNGColorType; - -#ifdef LODEPNG_COMPILE_DECODER -/* -Converts PNG data in memory to raw pixel data. -out: Output parameter. Pointer to buffer that will contain the raw pixel data. - After decoding, its size is w * h * (bytes per pixel) bytes larger than - initially. Bytes per pixel depends on colortype and bitdepth. - Must be freed after usage with free(*out). - Note: for 16-bit per channel colors, uses big endian format like PNG does. -w: Output parameter. Pointer to width of pixel data. -h: Output parameter. Pointer to height of pixel data. -in: Memory buffer with the PNG file. -insize: size of the in buffer. -colortype: the desired color type for the raw output image. See explanation on PNG color types. -bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types. -Return value: LodePNG error code (0 means no error). -*/ -unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, - const unsigned char* in, size_t insize, - LodePNGColorType colortype, unsigned bitdepth); - -/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/ -unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, - const unsigned char* in, size_t insize); - -/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/ -unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, - const unsigned char* in, size_t insize); - -#ifdef LODEPNG_COMPILE_DISK -/* -Load PNG from disk, from file with given name. -Same as the other decode functions, but instead takes a filename as input. -*/ -unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, - const char* filename, - LodePNGColorType colortype, unsigned bitdepth); - -/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.*/ -unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, - const char* filename); - -/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.*/ -unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, - const char* filename); -#endif /*LODEPNG_COMPILE_DISK*/ -#endif /*LODEPNG_COMPILE_DECODER*/ - - -#ifdef LODEPNG_COMPILE_ENCODER -/* -Converts raw pixel data into a PNG image in memory. The colortype and bitdepth - of the output PNG image cannot be chosen, they are automatically determined - by the colortype, bitdepth and content of the input pixel data. - Note: for 16-bit per channel colors, needs big endian format like PNG does. -out: Output parameter. Pointer to buffer that will contain the PNG image data. - Must be freed after usage with free(*out). -outsize: Output parameter. Pointer to the size in bytes of the out buffer. -image: The raw pixel data to encode. The size of this buffer should be - w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth. -w: width of the raw pixel data in pixels. -h: height of the raw pixel data in pixels. -colortype: the color type of the raw input image. See explanation on PNG color types. -bitdepth: the bit depth of the raw input image. See explanation on PNG color types. -Return value: LodePNG error code (0 means no error). -*/ -unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, - const unsigned char* image, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth); - -/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/ -unsigned lodepng_encode32(unsigned char** out, size_t* outsize, - const unsigned char* image, unsigned w, unsigned h); - -/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/ -unsigned lodepng_encode24(unsigned char** out, size_t* outsize, - const unsigned char* image, unsigned w, unsigned h); - -#ifdef LODEPNG_COMPILE_DISK -/* -Converts raw pixel data into a PNG file on disk. -Same as the other encode functions, but instead takes a filename as output. -NOTE: This overwrites existing files without warning! -*/ -unsigned lodepng_encode_file(const char* filename, - const unsigned char* image, unsigned w, unsigned h, - LodePNGColorType colortype, unsigned bitdepth); - -/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.*/ -unsigned lodepng_encode32_file(const char* filename, - const unsigned char* image, unsigned w, unsigned h); - -/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.*/ -unsigned lodepng_encode24_file(const char* filename, - const unsigned char* image, unsigned w, unsigned h); -#endif /*LODEPNG_COMPILE_DISK*/ -#endif /*LODEPNG_COMPILE_ENCODER*/ - - -#ifdef LODEPNG_COMPILE_CPP -namespace lodepng -{ -#ifdef LODEPNG_COMPILE_DECODER -/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype -is the format to output the pixels to. Default is RGBA 8-bit per channel.*/ -unsigned decode(std::vector& out, unsigned& w, unsigned& h, - const unsigned char* in, size_t insize, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -unsigned decode(std::vector& out, unsigned& w, unsigned& h, - const std::vector& in, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -#ifdef LODEPNG_COMPILE_DISK -/* -Converts PNG file from disk to raw pixel data in memory. -Same as the other decode functions, but instead takes a filename as input. -*/ -unsigned decode(std::vector& out, unsigned& w, unsigned& h, - const std::string& filename, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -#endif /* LODEPNG_COMPILE_DISK */ -#endif /* LODEPNG_COMPILE_DECODER */ - -#ifdef LODEPNG_COMPILE_ENCODER -/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype -is that of the raw input data. The output PNG color type will be auto chosen.*/ -unsigned encode(std::vector& out, - const unsigned char* in, unsigned w, unsigned h, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -unsigned encode(std::vector& out, - const std::vector& in, unsigned w, unsigned h, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -#ifdef LODEPNG_COMPILE_DISK -/* -Converts 32-bit RGBA raw pixel data into a PNG file on disk. -Same as the other encode functions, but instead takes a filename as output. -NOTE: This overwrites existing files without warning! -*/ -unsigned encode(const std::string& filename, - const unsigned char* in, unsigned w, unsigned h, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -unsigned encode(const std::string& filename, - const std::vector& in, unsigned w, unsigned h, - LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); -#endif /* LODEPNG_COMPILE_DISK */ -#endif /* LODEPNG_COMPILE_ENCODER */ -} /* namespace lodepng */ -#endif /*LODEPNG_COMPILE_CPP*/ -#endif /*LODEPNG_COMPILE_PNG*/ - -#ifdef LODEPNG_COMPILE_ERROR_TEXT -/*Returns an English description of the numerical error code.*/ -const char* lodepng_error_text(unsigned code); -#endif /*LODEPNG_COMPILE_ERROR_TEXT*/ - -#ifdef LODEPNG_COMPILE_DECODER -/*Settings for zlib decompression*/ -typedef struct LodePNGDecompressSettings LodePNGDecompressSettings; -struct LodePNGDecompressSettings -{ - /* Check LodePNGDecoderSettings for more ignorable errors */ - unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ - - /*use custom zlib decoder instead of built in one (default: null)*/ - unsigned (*custom_zlib)(unsigned char**, size_t*, - const unsigned char*, size_t, - const LodePNGDecompressSettings*); - /*use custom deflate decoder instead of built in one (default: null) - if custom_zlib is used, custom_deflate is ignored since only the built in - zlib function will call custom_deflate*/ - unsigned (*custom_inflate)(unsigned char**, size_t*, - const unsigned char*, size_t, - const LodePNGDecompressSettings*); - - const void* custom_context; /*optional custom settings for custom functions*/ -}; - -extern const LodePNGDecompressSettings lodepng_default_decompress_settings; -void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -/* -Settings for zlib compression. Tweaking these settings tweaks the balance -between speed and compression ratio. -*/ -typedef struct LodePNGCompressSettings LodePNGCompressSettings; -struct LodePNGCompressSettings /*deflate = compress*/ -{ - /*LZ77 related settings*/ - unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/ - unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/ - unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/ - unsigned minmatch; /*mininum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/ - unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/ - unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/ - - /*use custom zlib encoder instead of built in one (default: null)*/ - unsigned (*custom_zlib)(unsigned char**, size_t*, - const unsigned char*, size_t, - const LodePNGCompressSettings*); - /*use custom deflate encoder instead of built in one (default: null) - if custom_zlib is used, custom_deflate is ignored since only the built in - zlib function will call custom_deflate*/ - unsigned (*custom_deflate)(unsigned char**, size_t*, - const unsigned char*, size_t, - const LodePNGCompressSettings*); - - const void* custom_context; /*optional custom settings for custom functions*/ -}; - -extern const LodePNGCompressSettings lodepng_default_compress_settings; -void lodepng_compress_settings_init(LodePNGCompressSettings* settings); -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#ifdef LODEPNG_COMPILE_PNG -/* -Color mode of an image. Contains all information required to decode the pixel -bits to RGBA colors. This information is the same as used in the PNG file -format, and is used both for PNG and raw image data in LodePNG. -*/ -typedef struct LodePNGColorMode -{ - /*header (IHDR)*/ - LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ - unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ - - /* - palette (PLTE and tRNS) - - Dynamically allocated with the colors of the palette, including alpha. - When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use - lodepng_palette_clear, then for each color use lodepng_palette_add. - If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette. - - When decoding, by default you can ignore this palette, since LodePNG already - fills the palette colors in the pixels of the raw RGBA output. - - The palette is only supported for color type 3. - */ - unsigned char* palette; /*palette in RGBARGBA... order. When allocated, must be either 0, or have size 1024*/ - size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/ - - /* - transparent color key (tRNS) - - This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. - For greyscale PNGs, r, g and b will all 3 be set to the same. - - When decoding, by default you can ignore this information, since LodePNG sets - pixels with this key to transparent already in the raw RGBA output. - - The color key is only supported for color types 0 and 2. - */ - unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ - unsigned key_r; /*red/greyscale component of color key*/ - unsigned key_g; /*green component of color key*/ - unsigned key_b; /*blue component of color key*/ -} LodePNGColorMode; - -/*init, cleanup and copy functions to use with this struct*/ -void lodepng_color_mode_init(LodePNGColorMode* info); -void lodepng_color_mode_cleanup(LodePNGColorMode* info); -/*return value is error code (0 means no error)*/ -unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source); - -void lodepng_palette_clear(LodePNGColorMode* info); -/*add 1 color to the palette*/ -unsigned lodepng_palette_add(LodePNGColorMode* info, - unsigned char r, unsigned char g, unsigned char b, unsigned char a); - -/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/ -unsigned lodepng_get_bpp(const LodePNGColorMode* info); -/*get the amount of color channels used, based on colortype in the struct. -If a palette is used, it counts as 1 channel.*/ -unsigned lodepng_get_channels(const LodePNGColorMode* info); -/*is it a greyscale type? (only colortype 0 or 4)*/ -unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info); -/*has it got an alpha channel? (only colortype 2 or 6)*/ -unsigned lodepng_is_alpha_type(const LodePNGColorMode* info); -/*has it got a palette? (only colortype 3)*/ -unsigned lodepng_is_palette_type(const LodePNGColorMode* info); -/*only returns true if there is a palette and there is a value in the palette with alpha < 255. -Loops through the palette to check this.*/ -unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info); -/* -Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image. -Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels). -Returns false if the image can only have opaque pixels. -In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values, -or if "key_defined" is true. -*/ -unsigned lodepng_can_have_alpha(const LodePNGColorMode* info); -/*Returns the byte size of a raw image buffer with given width, height and color mode*/ -size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color); - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -/*The information of a Time chunk in PNG.*/ -typedef struct LodePNGTime -{ - unsigned year; /*2 bytes used (0-65535)*/ - unsigned month; /*1-12*/ - unsigned day; /*1-31*/ - unsigned hour; /*0-23*/ - unsigned minute; /*0-59*/ - unsigned second; /*0-60 (to allow for leap seconds)*/ -} LodePNGTime; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -/*Information about the PNG image, except pixels, width and height.*/ -typedef struct LodePNGInfo -{ - /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ - unsigned compression_method;/*compression method of the original file. Always 0.*/ - unsigned filter_method; /*filter method of the original file*/ - unsigned interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/ - LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /* - suggested background color chunk (bKGD) - This color uses the same color mode as the PNG (except alpha channel), which can be 1-bit to 16-bit. - - For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding - the encoder writes the red one. For palette PNGs: When decoding, the RGB value - will be stored, not a palette index. But when encoding, specify the index of - the palette in background_r, the other two are then ignored. - - The decoder does not use this background color to edit the color of pixels. - */ - unsigned background_defined; /*is a suggested background color given?*/ - unsigned background_r; /*red component of suggested background color*/ - unsigned background_g; /*green component of suggested background color*/ - unsigned background_b; /*blue component of suggested background color*/ - - /* - non-international text chunks (tEXt and zTXt) - - The char** arrays each contain num strings. The actual messages are in - text_strings, while text_keys are keywords that give a short description what - the actual text represents, e.g. Title, Author, Description, or anything else. - - A keyword is minimum 1 character and maximum 79 characters long. It's - discouraged to use a single line length longer than 79 characters for texts. - - Don't allocate these text buffers yourself. Use the init/cleanup functions - correctly and use lodepng_add_text and lodepng_clear_text. - */ - size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/ - char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/ - char** text_strings; /*the actual text*/ - - /* - international text chunks (iTXt) - Similar to the non-international text chunks, but with additional strings - "langtags" and "transkeys". - */ - size_t itext_num; /*the amount of international texts in this PNG*/ - char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/ - char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ - char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/ - char** itext_strings; /*the actual international text - UTF-8 string*/ - - /*time chunk (tIME)*/ - unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/ - LodePNGTime time; - - /*phys chunk (pHYs)*/ - unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/ - unsigned phys_x; /*pixels per unit in x direction*/ - unsigned phys_y; /*pixels per unit in y direction*/ - unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ - - /* - unknown chunks - There are 3 buffers, one for each position in the PNG where unknown chunks can appear - each buffer contains all unknown chunks for that position consecutively - The 3 buffers are the unknown chunks between certain critical chunks: - 0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND - Do not allocate or traverse this data yourself. Use the chunk traversing functions declared - later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct. - */ - unsigned char* unknown_chunks_data[3]; - size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/ -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -} LodePNGInfo; - -/*init, cleanup and copy functions to use with this struct*/ -void lodepng_info_init(LodePNGInfo* info); -void lodepng_info_cleanup(LodePNGInfo* info); -/*return value is error code (0 means no error)*/ -unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source); - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS -void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ -unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/ - -void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/ -unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, - const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ - -/* -Converts raw buffer from one color type to another color type, based on -LodePNGColorMode structs to describe the input and output color type. -See the reference manual at the end of this header file to see which color conversions are supported. -return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported) -The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel -of the output color type (lodepng_get_bpp). -For < 8 bpp images, there should not be padding bits at the end of scanlines. -For 16-bit per channel colors, uses big endian format like PNG does. -Return value is LodePNG error code -*/ -unsigned lodepng_convert(unsigned char* out, const unsigned char* in, - const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, - unsigned w, unsigned h); - -#ifdef LODEPNG_COMPILE_DECODER -/* -Settings for the decoder. This contains settings for the PNG and the Zlib -decoder, but not the Info settings from the Info structs. -*/ -typedef struct LodePNGDecoderSettings -{ - LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ - - /* Check LodePNGDecompressSettings for more ignorable errors */ - unsigned ignore_crc; /*ignore CRC checksums*/ - unsigned ignore_critical; /*ignore unknown critical chunks*/ - unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/ - - unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ - -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/ - /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/ - unsigned remember_unknown_chunks; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -} LodePNGDecoderSettings; - -void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/ -typedef enum LodePNGFilterStrategy -{ - /*every filter at zero*/ - LFS_ZERO, - /*Use filter that gives minimum sum, as described in the official PNG filter heuristic.*/ - LFS_MINSUM, - /*Use the filter type that gives smallest Shannon entropy for this scanline. Depending - on the image, this is better or worse than minsum.*/ - LFS_ENTROPY, - /* - Brute-force-search PNG filters by compressing each filter for each scanline. - Experimental, very slow, and only rarely gives better compression than MINSUM. - */ - LFS_BRUTE_FORCE, - /*use predefined_filters buffer: you specify the filter type for each scanline*/ - LFS_PREDEFINED -} LodePNGFilterStrategy; - -/*Gives characteristics about the colors of the image, which helps decide which color model to use for encoding. -Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/ -typedef struct LodePNGColorProfile -{ - unsigned colored; /*not greyscale*/ - unsigned key; /*image is not opaque and color key is possible instead of full alpha*/ - unsigned short key_r; /*key values, always as 16-bit, in 8-bit case the byte is duplicated, e.g. 65535 means 255*/ - unsigned short key_g; - unsigned short key_b; - unsigned alpha; /*image is not opaque and alpha channel or alpha palette required*/ - unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16.*/ - unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order*/ - unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for greyscale only. 16 if 16-bit per channel required.*/ -} LodePNGColorProfile; - -void lodepng_color_profile_init(LodePNGColorProfile* profile); - -/*Get a LodePNGColorProfile of the image.*/ -unsigned lodepng_get_color_profile(LodePNGColorProfile* profile, - const unsigned char* image, unsigned w, unsigned h, - const LodePNGColorMode* mode_in); -/*The function LodePNG uses internally to decide the PNG color with auto_convert. -Chooses an optimal color model, e.g. grey if only grey pixels, palette if < 256 colors, ...*/ -unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, - const unsigned char* image, unsigned w, unsigned h, - const LodePNGColorMode* mode_in); - -/*Settings for the encoder.*/ -typedef struct LodePNGEncoderSettings -{ - LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ - - unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/ - - /*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than - 8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to - completely follow the official PNG heuristic, filter_palette_zero must be true and - filter_strategy must be LFS_MINSUM*/ - unsigned filter_palette_zero; - /*Which filter strategy to use when not using zeroes due to filter_palette_zero. - Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/ - LodePNGFilterStrategy filter_strategy; - /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with - the same length as the amount of scanlines in the image, and each value must <= 5. You - have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero - must be set to 0 to ensure this is also used on palette or low bitdepth images.*/ - const unsigned char* predefined_filters; - - /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). - If colortype is 3, PLTE is _always_ created.*/ - unsigned force_palette; -#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS - /*add LodePNG identifier and version as a text chunk, for debugging*/ - unsigned add_id; - /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ - unsigned text_compression; -#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ -} LodePNGEncoderSettings; - -void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings); -#endif /*LODEPNG_COMPILE_ENCODER*/ - - -#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) -/*The settings, state and information for extended encoding and decoding.*/ -typedef struct LodePNGState -{ -#ifdef LODEPNG_COMPILE_DECODER - LodePNGDecoderSettings decoder; /*the decoding settings*/ -#endif /*LODEPNG_COMPILE_DECODER*/ -#ifdef LODEPNG_COMPILE_ENCODER - LodePNGEncoderSettings encoder; /*the encoding settings*/ -#endif /*LODEPNG_COMPILE_ENCODER*/ - LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ - LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ - unsigned error; -#ifdef LODEPNG_COMPILE_CPP - /* For the lodepng::State subclass. */ - virtual ~LodePNGState(){} -#endif -} LodePNGState; - -/*init, cleanup and copy functions to use with this struct*/ -void lodepng_state_init(LodePNGState* state); -void lodepng_state_cleanup(LodePNGState* state); -void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source); -#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ - -#ifdef LODEPNG_COMPILE_DECODER -/* -Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and -getting much more information about the PNG image and color mode. -*/ -unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, - LodePNGState* state, - const unsigned char* in, size_t insize); - -/* -Read the PNG header, but not the actual data. This returns only the information -that is in the header chunk of the PNG, such as width, height and color type. The -information is placed in the info_png field of the LodePNGState. -*/ -unsigned lodepng_inspect(unsigned* w, unsigned* h, - LodePNGState* state, - const unsigned char* in, size_t insize); -#endif /*LODEPNG_COMPILE_DECODER*/ - - -#ifdef LODEPNG_COMPILE_ENCODER -/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/ -unsigned lodepng_encode(unsigned char** out, size_t* outsize, - const unsigned char* image, unsigned w, unsigned h, - LodePNGState* state); -#endif /*LODEPNG_COMPILE_ENCODER*/ - -/* -The lodepng_chunk functions are normally not needed, except to traverse the -unknown chunks stored in the LodePNGInfo struct, or add new ones to it. -It also allows traversing the chunks of an encoded PNG file yourself. - -PNG standard chunk naming conventions: -First byte: uppercase = critical, lowercase = ancillary -Second byte: uppercase = public, lowercase = private -Third byte: must be uppercase -Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy -*/ - -/* -Gets the length of the data of the chunk. Total chunk length has 12 bytes more. -There must be at least 4 bytes to read from. If the result value is too large, -it may be corrupt data. -*/ -unsigned lodepng_chunk_length(const unsigned char* chunk); - -/*puts the 4-byte type in null terminated string*/ -void lodepng_chunk_type(char type[5], const unsigned char* chunk); - -/*check if the type is the given type*/ -unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type); - -/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/ -unsigned char lodepng_chunk_ancillary(const unsigned char* chunk); - -/*0: public, 1: private (see PNG standard)*/ -unsigned char lodepng_chunk_private(const unsigned char* chunk); - -/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/ -unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk); - -/*get pointer to the data of the chunk, where the input points to the header of the chunk*/ -unsigned char* lodepng_chunk_data(unsigned char* chunk); -const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk); - -/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/ -unsigned lodepng_chunk_check_crc(const unsigned char* chunk); - -/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ -void lodepng_chunk_generate_crc(unsigned char* chunk); - -/*iterate to next chunks. don't use on IEND chunk, as there is no next chunk then*/ -unsigned char* lodepng_chunk_next(unsigned char* chunk); -const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk); - -/* -Appends chunk to the data in out. The given chunk should already have its chunk header. -The out variable and outlength are updated to reflect the new reallocated buffer. -Returns error code (0 if it went ok) -*/ -unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk); - -/* -Appends new chunk to out. The chunk to append is given by giving its length, type -and data separately. The type is a 4-letter string. -The out variable and outlength are updated to reflect the new reallocated buffer. -Returne error code (0 if it went ok) -*/ -unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, - const char* type, const unsigned char* data); - - -/*Calculate CRC32 of buffer*/ -unsigned lodepng_crc32(const unsigned char* buf, size_t len); -#endif /*LODEPNG_COMPILE_PNG*/ - - -#ifdef LODEPNG_COMPILE_ZLIB -/* -This zlib part can be used independently to zlib compress and decompress a -buffer. It cannot be used to create gzip files however, and it only supports the -part of zlib that is required for PNG, it does not support dictionaries. -*/ - -#ifdef LODEPNG_COMPILE_DECODER -/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/ -unsigned lodepng_inflate(unsigned char** out, size_t* outsize, - const unsigned char* in, size_t insize, - const LodePNGDecompressSettings* settings); - -/* -Decompresses Zlib data. Reallocates the out buffer and appends the data. The -data must be according to the zlib specification. -Either, *out must be NULL and *outsize must be 0, or, *out must be a valid -buffer and *outsize its size in bytes. out must be freed by user after usage. -*/ -unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, - const unsigned char* in, size_t insize, - const LodePNGDecompressSettings* settings); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -/* -Compresses data with Zlib. Reallocates the out buffer and appends the data. -Zlib adds a small header and trailer around the deflate data. -The data is output in the format of the zlib specification. -Either, *out must be NULL and *outsize must be 0, or, *out must be a valid -buffer and *outsize its size in bytes. out must be freed by user after usage. -*/ -unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, - const unsigned char* in, size_t insize, - const LodePNGCompressSettings* settings); - -/* -Find length-limited Huffman code for given frequencies. This function is in the -public interface only for tests, it's used internally by lodepng_deflate. -*/ -unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, - size_t numcodes, unsigned maxbitlen); - -/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/ -unsigned lodepng_deflate(unsigned char** out, size_t* outsize, - const unsigned char* in, size_t insize, - const LodePNGCompressSettings* settings); - -#endif /*LODEPNG_COMPILE_ENCODER*/ -#endif /*LODEPNG_COMPILE_ZLIB*/ - -#ifdef LODEPNG_COMPILE_DISK -/* -Load a file from disk into buffer. The function allocates the out buffer, and -after usage you should free it. -out: output parameter, contains pointer to loaded buffer. -outsize: output parameter, size of the allocated out buffer -filename: the path to the file to load -return value: error code (0 means ok) -*/ -unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename); - -/* -Save a file from buffer to disk. Warning, if it exists, this function overwrites -the file without warning! -buffer: the buffer to write -buffersize: size of the buffer to write -filename: the path to the file to save to -return value: error code (0 means ok) -*/ -unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename); -#endif /*LODEPNG_COMPILE_DISK*/ - -#ifdef LODEPNG_COMPILE_CPP -/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */ -namespace lodepng -{ -#ifdef LODEPNG_COMPILE_PNG -class State : public LodePNGState -{ - public: - State(); - State(const State& other); - virtual ~State(); - State& operator=(const State& other); -}; - -#ifdef LODEPNG_COMPILE_DECODER -/* Same as other lodepng::decode, but using a State for more settings and information. */ -unsigned decode(std::vector& out, unsigned& w, unsigned& h, - State& state, - const unsigned char* in, size_t insize); -unsigned decode(std::vector& out, unsigned& w, unsigned& h, - State& state, - const std::vector& in); -#endif /*LODEPNG_COMPILE_DECODER*/ - -#ifdef LODEPNG_COMPILE_ENCODER -/* Same as other lodepng::encode, but using a State for more settings and information. */ -unsigned encode(std::vector& out, - const unsigned char* in, unsigned w, unsigned h, - State& state); -unsigned encode(std::vector& out, - const std::vector& in, unsigned w, unsigned h, - State& state); -#endif /*LODEPNG_COMPILE_ENCODER*/ - -#ifdef LODEPNG_COMPILE_DISK -/* -Load a file from disk into an std::vector. -return value: error code (0 means ok) -*/ -unsigned load_file(std::vector& buffer, const std::string& filename); - -/* -Save the binary data in an std::vector to a file on disk. The file is overwritten -without warning. -*/ -unsigned save_file(const std::vector& buffer, const std::string& filename); -#endif /* LODEPNG_COMPILE_DISK */ -#endif /* LODEPNG_COMPILE_PNG */ - -#ifdef LODEPNG_COMPILE_ZLIB -#ifdef LODEPNG_COMPILE_DECODER -/* Zlib-decompress an unsigned char buffer */ -unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, - const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); - -/* Zlib-decompress an std::vector */ -unsigned decompress(std::vector& out, const std::vector& in, - const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); -#endif /* LODEPNG_COMPILE_DECODER */ - -#ifdef LODEPNG_COMPILE_ENCODER -/* Zlib-compress an unsigned char buffer */ -unsigned compress(std::vector& out, const unsigned char* in, size_t insize, - const LodePNGCompressSettings& settings = lodepng_default_compress_settings); - -/* Zlib-compress an std::vector */ -unsigned compress(std::vector& out, const std::vector& in, - const LodePNGCompressSettings& settings = lodepng_default_compress_settings); -#endif /* LODEPNG_COMPILE_ENCODER */ -#endif /* LODEPNG_COMPILE_ZLIB */ -} /* namespace lodepng */ -#endif /*LODEPNG_COMPILE_CPP*/ - -/* -TODO: -[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often -[.] check compatibility with various compilers - done but needs to be redone for every newer version -[X] converting color to 16-bit per channel types -[ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values) -[ ] make sure encoder generates no chunks with size > (2^31)-1 -[ ] partial decoding (stream processing) -[X] let the "isFullyOpaque" function check color keys and transparent palettes too -[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" -[ ] don't stop decoding on errors like 69, 57, 58 (make warnings) -[ ] make warnings like: oob palette, checksum fail, data after iend, wrong/unknown crit chunk, no null terminator in text, ... -[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes -[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ... -[ ] allow user to give data (void*) to custom allocator -*/ - -#endif /*LODEPNG_H inclusion guard*/ - -/* -LodePNG Documentation ---------------------- - -0. table of contents --------------------- - - 1. about - 1.1. supported features - 1.2. features not supported - 2. C and C++ version - 3. security - 4. decoding - 5. encoding - 6. color conversions - 6.1. PNG color types - 6.2. color conversions - 6.3. padding bits - 6.4. A note about 16-bits per channel and endianness - 7. error values - 8. chunks and PNG editing - 9. compiler support - 10. examples - 10.1. decoder C++ example - 10.2. decoder C example - 11. state settings reference - 12. changes - 13. contact information - - -1. about --------- - -PNG is a file format to store raster images losslessly with good compression, -supporting different color types and alpha channel. - -LodePNG is a PNG codec according to the Portable Network Graphics (PNG) -Specification (Second Edition) - W3C Recommendation 10 November 2003. - -The specifications used are: - -*) Portable Network Graphics (PNG) Specification (Second Edition): - http://www.w3.org/TR/2003/REC-PNG-20031110 -*) RFC 1950 ZLIB Compressed Data Format version 3.3: - http://www.gzip.org/zlib/rfc-zlib.html -*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: - http://www.gzip.org/zlib/rfc-deflate.html - -The most recent version of LodePNG can currently be found at -http://lodev.org/lodepng/ - -LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds -extra functionality. - -LodePNG exists out of two files: --lodepng.h: the header file for both C and C++ --lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage - -If you want to start using LodePNG right away without reading this doc, get the -examples from the LodePNG website to see how to use it in code, or check the -smaller examples in chapter 13 here. - -LodePNG is simple but only supports the basic requirements. To achieve -simplicity, the following design choices were made: There are no dependencies -on any external library. There are functions to decode and encode a PNG with -a single function call, and extended versions of these functions taking a -LodePNGState struct allowing to specify or get more information. By default -the colors of the raw image are always RGB or RGBA, no matter what color type -the PNG file uses. To read and write files, there are simple functions to -convert the files to/from buffers in memory. - -This all makes LodePNG suitable for loading textures in games, demos and small -programs, ... It's less suitable for full fledged image editors, loading PNGs -over network (it requires all the image data to be available before decoding can -begin), life-critical systems, ... - -1.1. supported features ------------------------ - -The following features are supported by the decoder: - -*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, - or the same color type as the PNG -*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image -*) Adam7 interlace and deinterlace for any color type -*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk -*) support for alpha channels, including RGBA color model, translucent palettes and color keying -*) zlib decompression (inflate) -*) zlib compression (deflate) -*) CRC32 and ADLER32 checksums -*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. -*) the following chunks are supported (generated/interpreted) by both encoder and decoder: - IHDR: header information - PLTE: color palette - IDAT: pixel data - IEND: the final chunk - tRNS: transparency for palettized images - tEXt: textual information - zTXt: compressed textual information - iTXt: international textual information - bKGD: suggested background color - pHYs: physical dimensions - tIME: modification time - -1.2. features not supported ---------------------------- - -The following features are _not_ supported: - -*) some features needed to make a conformant PNG-Editor might be still missing. -*) partial loading/stream processing. All data must be available and is processed in one call. -*) The following public chunks are not supported but treated as unknown chunks by LodePNG - cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT - Some of these are not supported on purpose: LodePNG wants to provide the RGB values - stored in the pixels, not values modified by system dependent gamma or color models. - - -2. C and C++ version --------------------- - -The C version uses buffers allocated with alloc that you need to free() -yourself. You need to use init and cleanup functions for each struct whenever -using a struct from the C version to avoid exploits and memory leaks. - -The C++ version has extra functions with std::vectors in the interface and the -lodepng::State class which is a LodePNGState with constructor and destructor. - -These files work without modification for both C and C++ compilers because all -the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers -ignore it, and the C code is made to compile both with strict ISO C90 and C++. - -To use the C++ version, you need to rename the source file to lodepng.cpp -(instead of lodepng.c), and compile it with a C++ compiler. - -To use the C version, you need to rename the source file to lodepng.c (instead -of lodepng.cpp), and compile it with a C compiler. - - -3. Security ------------ - -Even if carefully designed, it's always possible that LodePNG contains possible -exploits. If you discover one, please let me know, and it will be fixed. - -When using LodePNG, care has to be taken with the C version of LodePNG, as well -as the C-style structs when working with C++. The following conventions are used -for all C-style structs: - --if a struct has a corresponding init function, always call the init function when making a new one --if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks --if a struct has a corresponding copy function, use the copy function instead of "=". - The destination must also be inited already. - - -4. Decoding ------------ - -Decoding converts a PNG compressed image to a raw pixel buffer. - -Most documentation on using the decoder is at its declarations in the header -above. For C, simple decoding can be done with functions such as -lodepng_decode32, and more advanced decoding can be done with the struct -LodePNGState and lodepng_decode. For C++, all decoding can be done with the -various lodepng::decode functions, and lodepng::State can be used for advanced -features. - -When using the LodePNGState, it uses the following fields for decoding: -*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here -*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get -*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use - -LodePNGInfo info_png --------------------- - -After decoding, this contains extra information of the PNG image, except the actual -pixels, width and height because these are already gotten directly from the decoder -functions. - -It contains for example the original color type of the PNG image, text comments, -suggested background color, etc... More details about the LodePNGInfo struct are -at its declaration documentation. - -LodePNGColorMode info_raw -------------------------- - -When decoding, here you can specify which color type you want -the resulting raw image to be. If this is different from the colortype of the -PNG, then the decoder will automatically convert the result. This conversion -always works, except if you want it to convert a color PNG to greyscale or to -a palette with missing colors. - -By default, 32-bit color is used for the result. - -LodePNGDecoderSettings decoder ------------------------------- - -The settings can be used to ignore the errors created by invalid CRC and Adler32 -chunks, and to disable the decoding of tEXt chunks. - -There's also a setting color_convert, true by default. If false, no conversion -is done, the resulting data will be as it was in the PNG (after decompression) -and you'll have to puzzle the colors of the pixels together yourself using the -color type information in the LodePNGInfo. - - -5. Encoding ------------ - -Encoding converts a raw pixel buffer to a PNG compressed image. - -Most documentation on using the encoder is at its declarations in the header -above. For C, simple encoding can be done with functions such as -lodepng_encode32, and more advanced decoding can be done with the struct -LodePNGState and lodepng_encode. For C++, all encoding can be done with the -various lodepng::encode functions, and lodepng::State can be used for advanced -features. - -Like the decoder, the encoder can also give errors. However it gives less errors -since the encoder input is trusted, the decoder input (a PNG image that could -be forged by anyone) is not trusted. - -When using the LodePNGState, it uses the following fields for encoding: -*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be. -*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has -*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use - -LodePNGInfo info_png --------------------- - -When encoding, you use this the opposite way as when decoding: for encoding, -you fill in the values you want the PNG to have before encoding. By default it's -not needed to specify a color type for the PNG since it's automatically chosen, -but it's possible to choose it yourself given the right settings. - -The encoder will not always exactly match the LodePNGInfo struct you give, -it tries as close as possible. Some things are ignored by the encoder. The -encoder uses, for example, the following settings from it when applicable: -colortype and bitdepth, text chunks, time chunk, the color key, the palette, the -background color, the interlace method, unknown chunks, ... - -When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk. -If the palette contains any colors for which the alpha channel is not 255 (so -there are translucent colors in the palette), it'll add a tRNS chunk. - -LodePNGColorMode info_raw -------------------------- - -You specify the color type of the raw image that you give to the input here, -including a possible transparent color key and palette you happen to be using in -your raw image data. - -By default, 32-bit color is assumed, meaning your input has to be in RGBA -format with 4 bytes (unsigned chars) per pixel. - -LodePNGEncoderSettings encoder ------------------------------- - -The following settings are supported (some are in sub-structs): -*) auto_convert: when this option is enabled, the encoder will -automatically choose the smallest possible color mode (including color key) that -can encode the colors of all pixels without information loss. -*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, - 2 = dynamic huffman tree (best compression). Should be 2 for proper - compression. -*) use_lz77: whether or not to use LZ77 for compressed block types. Should be - true for proper compression. -*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value - 2048 by default, but can be set to 32768 for better, but slow, compression. -*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE - chunk if force_palette is true. This can used as suggested palette to convert - to by viewers that don't support more than 256 colors (if those still exist) -*) add_id: add text chunk "Encoder: LodePNG " to the image. -*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks. - zTXt chunks use zlib compression on the text. This gives a smaller result on - large texts but a larger result on small texts (such as a single program name). - It's all tEXt or all zTXt though, there's no separate setting per text yet. - - -6. color conversions --------------------- - -An important thing to note about LodePNG, is that the color type of the PNG, and -the color type of the raw image, are completely independent. By default, when -you decode a PNG, you get the result as a raw image in the color type you want, -no matter whether the PNG was encoded with a palette, greyscale or RGBA color. -And if you encode an image, by default LodePNG will automatically choose the PNG -color type that gives good compression based on the values of colors and amount -of colors in the image. It can be configured to let you control it instead as -well, though. - -To be able to do this, LodePNG does conversions from one color mode to another. -It can convert from almost any color type to any other color type, except the -following conversions: RGB to greyscale is not supported, and converting to a -palette when the palette doesn't have a required color is not supported. This is -not supported on purpose: this is information loss which requires a color -reduction algorithm that is beyong the scope of a PNG encoder (yes, RGB to grey -is easy, but there are multiple ways if you want to give some channels more -weight). - -By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB -color, no matter what color type the PNG has. And by default when encoding, -LodePNG automatically picks the best color model for the output PNG, and expects -the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control -the color format of the images yourself, you can skip this chapter. - -6.1. PNG color types --------------------- - -A PNG image can have many color types, ranging from 1-bit color to 64-bit color, -as well as palettized color modes. After the zlib decompression and unfiltering -in the PNG image is done, the raw pixel data will have that color type and thus -a certain amount of bits per pixel. If you want the output raw image after -decoding to have another color type, a conversion is done by LodePNG. - -The PNG specification gives the following color types: - -0: greyscale, bit depths 1, 2, 4, 8, 16 -2: RGB, bit depths 8 and 16 -3: palette, bit depths 1, 2, 4 and 8 -4: greyscale with alpha, bit depths 8 and 16 -6: RGBA, bit depths 8 and 16 - -Bit depth is the amount of bits per pixel per color channel. So the total amount -of bits per pixel is: amount of channels * bitdepth. - -6.2. color conversions ----------------------- - -As explained in the sections about the encoder and decoder, you can specify -color types and bit depths in info_png and info_raw to change the default -behaviour. - -If, when decoding, you want the raw image to be something else than the default, -you need to set the color type and bit depth you want in the LodePNGColorMode, -or the parameters colortype and bitdepth of the simple decoding function. - -If, when encoding, you use another color type than the default in the raw input -image, you need to specify its color type and bit depth in the LodePNGColorMode -of the raw image, or use the parameters colortype and bitdepth of the simple -encoding function. - -If, when encoding, you don't want LodePNG to choose the output PNG color type -but control it yourself, you need to set auto_convert in the encoder settings -to false, and specify the color type you want in the LodePNGInfo of the -encoder (including palette: it can generate a palette if auto_convert is true, -otherwise not). - -If the input and output color type differ (whether user chosen or auto chosen), -LodePNG will do a color conversion, which follows the rules below, and may -sometimes result in an error. - -To avoid some confusion: --the decoder converts from PNG to raw image --the encoder converts from raw image to PNG --the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image --the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG --when encoding, the color type in LodePNGInfo is ignored if auto_convert - is enabled, it is automatically generated instead --when decoding, the color type in LodePNGInfo is set by the decoder to that of the original - PNG image, but it can be ignored since the raw image has the color type you requested instead --if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion - between the color types is done if the color types are supported. If it is not - supported, an error is returned. If the types are the same, no conversion is done. --even though some conversions aren't supported, LodePNG supports loading PNGs from any - colortype and saving PNGs to any colortype, sometimes it just requires preparing - the raw image correctly before encoding. --both encoder and decoder use the same color converter. - -Non supported color conversions: --color to greyscale: no error is thrown, but the result will look ugly because -only the red channel is taken --anything to palette when that palette does not have that color in it: in this -case an error is thrown - -Supported color conversions: --anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA --any grey or grey+alpha, to grey or grey+alpha --anything to a palette, as long as the palette has the requested colors in it --removing alpha channel --higher to smaller bitdepth, and vice versa - -If you want no color conversion to be done (e.g. for speed or control): --In the encoder, you can make it save a PNG with any color type by giving the -raw color mode and LodePNGInfo the same color mode, and setting auto_convert to -false. --In the decoder, you can make it store the pixel data in the same color type -as the PNG has, by setting the color_convert setting to false. Settings in -info_raw are then ignored. - -The function lodepng_convert does the color conversion. It is available in the -interface but normally isn't needed since the encoder and decoder already call -it. - -6.3. padding bits ------------------ - -In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines -have a bit amount that isn't a multiple of 8, then padding bits are used so that each -scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output. -The raw input image you give to the encoder, and the raw output image you get from the decoder -will NOT have these padding bits, e.g. in the case of a 1-bit image with a width -of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte, -not the first bit of a new byte. - -6.4. A note about 16-bits per channel and endianness ----------------------------------------------------- - -LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like -for any other color format. The 16-bit values are stored in big endian (most -significant byte first) in these arrays. This is the opposite order of the -little endian used by x86 CPU's. - -LodePNG always uses big endian because the PNG file format does so internally. -Conversions to other formats than PNG uses internally are not supported by -LodePNG on purpose, there are myriads of formats, including endianness of 16-bit -colors, the order in which you store R, G, B and A, and so on. Supporting and -converting to/from all that is outside the scope of LodePNG. - -This may mean that, depending on your use case, you may want to convert the big -endian output of LodePNG to little endian with a for loop. This is certainly not -always needed, many applications and libraries support big endian 16-bit colors -anyway, but it means you cannot simply cast the unsigned char* buffer to an -unsigned short* buffer on x86 CPUs. - - -7. error values ---------------- - -All functions in LodePNG that return an error code, return 0 if everything went -OK, or a non-zero code if there was an error. - -The meaning of the LodePNG error values can be retrieved with the function -lodepng_error_text: given the numerical error code, it returns a description -of the error in English as a string. - -Check the implementation of lodepng_error_text to see the meaning of each code. - - -8. chunks and PNG editing -------------------------- - -If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG -editor that should follow the rules about handling of unknown chunks, or if your -program is able to read other types of chunks than the ones handled by LodePNG, -then that's possible with the chunk functions of LodePNG. - -A PNG chunk has the following layout: - -4 bytes length -4 bytes type name -length bytes data -4 bytes CRC - -8.1. iterating through chunks ------------------------------ - -If you have a buffer containing the PNG image data, then the first chunk (the -IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the -signature of the PNG and are not part of a chunk. But if you start at byte 8 -then you have a chunk, and can check the following things of it. - -NOTE: none of these functions check for memory buffer boundaries. To avoid -exploits, always make sure the buffer contains all the data of the chunks. -When using lodepng_chunk_next, make sure the returned value is within the -allocated memory. - -unsigned lodepng_chunk_length(const unsigned char* chunk): - -Get the length of the chunk's data. The total chunk length is this length + 12. - -void lodepng_chunk_type(char type[5], const unsigned char* chunk): -unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type): - -Get the type of the chunk or compare if it's a certain type - -unsigned char lodepng_chunk_critical(const unsigned char* chunk): -unsigned char lodepng_chunk_private(const unsigned char* chunk): -unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk): - -Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). -Check if the chunk is private (public chunks are part of the standard, private ones not). -Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical -chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your -program doesn't handle that type of unknown chunk. - -unsigned char* lodepng_chunk_data(unsigned char* chunk): -const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk): - -Get a pointer to the start of the data of the chunk. - -unsigned lodepng_chunk_check_crc(const unsigned char* chunk): -void lodepng_chunk_generate_crc(unsigned char* chunk): - -Check if the crc is correct or generate a correct one. - -unsigned char* lodepng_chunk_next(unsigned char* chunk): -const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk): - -Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these -functions do no boundary checking of the allocated data whatsoever, so make sure there is enough -data available in the buffer to be able to go to the next chunk. - -unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk): -unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, - const char* type, const unsigned char* data): - -These functions are used to create new chunks that are appended to the data in *out that has -length *outlength. The append function appends an existing chunk to the new data. The create -function creates a new chunk with the given parameters and appends it. Type is the 4-letter -name of the chunk. - -8.2. chunks in info_png ------------------------ - -The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3 -buffers (each with size) to contain 3 types of unknown chunks: -the ones that come before the PLTE chunk, the ones that come between the PLTE -and the IDAT chunks, and the ones that come after the IDAT chunks. -It's necessary to make the distionction between these 3 cases because the PNG -standard forces to keep the ordering of unknown chunks compared to the critical -chunks, but does not force any other ordering rules. - -info_png.unknown_chunks_data[0] is the chunks before PLTE -info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT -info_png.unknown_chunks_data[2] is the chunks after IDAT - -The chunks in these 3 buffers can be iterated through and read by using the same -way described in the previous subchapter. - -When using the decoder to decode a PNG, you can make it store all unknown chunks -if you set the option settings.remember_unknown_chunks to 1. By default, this -option is off (0). - -The encoder will always encode unknown chunks that are stored in the info_png. -If you need it to add a particular chunk that isn't known by LodePNG, you can -use lodepng_chunk_append or lodepng_chunk_create to the chunk data in -info_png.unknown_chunks_data[x]. - -Chunks that are known by LodePNG should not be added in that way. E.g. to make -LodePNG add a bKGD chunk, set background_defined to true and add the correct -parameters there instead. - - -9. compiler support -------------------- - -No libraries other than the current standard C library are needed to compile -LodePNG. For the C++ version, only the standard C++ library is needed on top. -Add the files lodepng.c(pp) and lodepng.h to your project, include -lodepng.h where needed, and your program can read/write PNG files. - -It is compatible with C90 and up, and C++03 and up. - -If performance is important, use optimization when compiling! For both the -encoder and decoder, this makes a large difference. - -Make sure that LodePNG is compiled with the same compiler of the same version -and with the same settings as the rest of the program, or the interfaces with -std::vectors and std::strings in C++ can be incompatible. - -CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. - -*) gcc and g++ - -LodePNG is developed in gcc so this compiler is natively supported. It gives no -warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ -version 4.7.1 on Linux, 32-bit and 64-bit. - -*) Clang - -Fully supported and warning-free. - -*) Mingw - -The Mingw compiler (a port of gcc for Windows) should be fully supported by -LodePNG. - -*) Visual Studio and Visual C++ Express Edition - -LodePNG should be warning-free with warning level W4. Two warnings were disabled -with pragmas though: warning 4244 about implicit conversions, and warning 4996 -where it wants to use a non-standard function fopen_s instead of the standard C -fopen. - -Visual Studio may want "stdafx.h" files to be included in each source file and -give an error "unexpected end of file while looking for precompiled header". -This is not standard C++ and will not be added to the stock LodePNG. You can -disable it for lodepng.cpp only by right clicking it, Properties, C/C++, -Precompiled Headers, and set it to Not Using Precompiled Headers there. - -NOTE: Modern versions of VS should be fully supported, but old versions, e.g. -VS6, are not guaranteed to work. - -*) Compilers on Macintosh - -LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for -C and C++. - -*) Other Compilers - -If you encounter problems on any compilers, feel free to let me know and I may -try to fix it if the compiler is modern and standards complient. - - -10. examples ------------- - -This decoder example shows the most basic usage of LodePNG. More complex -examples can be found on the LodePNG website. - -10.1. decoder C++ example -------------------------- - -#include "lodepng.h" -#include - -int main(int argc, char *argv[]) -{ - const char* filename = argc > 1 ? argv[1] : "test.png"; - - //load and decode - std::vector image; - unsigned width, height; - unsigned error = lodepng::decode(image, width, height, filename); - - //if there's an error, display it - if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl; - - //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ... -} - -10.2. decoder C example ------------------------ - -#include "lodepng.h" - -int main(int argc, char *argv[]) -{ - unsigned error; - unsigned char* image; - size_t width, height; - const char* filename = argc > 1 ? argv[1] : "test.png"; - - error = lodepng_decode32_file(&image, &width, &height, filename); - - if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error)); - - / * use image here * / - - free(image); - return 0; -} - -11. state settings reference ----------------------------- - -A quick reference of some settings to set on the LodePNGState - -For decoding: - -state.decoder.zlibsettings.ignore_adler32: ignore ADLER32 checksums -state.decoder.zlibsettings.custom_...: use custom inflate function -state.decoder.ignore_crc: ignore CRC checksums -state.decoder.ignore_critical: ignore unknown critical chunks -state.decoder.ignore_end: ignore missing IEND chunk. May fail if this corruption causes other errors -state.decoder.color_convert: convert internal PNG color to chosen one -state.decoder.read_text_chunks: whether to read in text metadata chunks -state.decoder.remember_unknown_chunks: whether to read in unknown chunks -state.info_raw.colortype: desired color type for decoded image -state.info_raw.bitdepth: desired bit depth for decoded image -state.info_raw....: more color settings, see struct LodePNGColorMode -state.info_png....: no settings for decoder but ouput, see struct LodePNGInfo - -For encoding: - -state.encoder.zlibsettings.btype: disable compression by setting it to 0 -state.encoder.zlibsettings.use_lz77: use LZ77 in compression -state.encoder.zlibsettings.windowsize: tweak LZ77 windowsize -state.encoder.zlibsettings.minmatch: tweak min LZ77 length to match -state.encoder.zlibsettings.nicematch: tweak LZ77 match where to stop searching -state.encoder.zlibsettings.lazymatching: try one more LZ77 matching -state.encoder.zlibsettings.custom_...: use custom deflate function -state.encoder.auto_convert: choose optimal PNG color type, if 0 uses info_png -state.encoder.filter_palette_zero: PNG filter strategy for palette -state.encoder.filter_strategy: PNG filter strategy to encode with -state.encoder.force_palette: add palette even if not encoding to one -state.encoder.add_id: add LodePNG identifier and version as a text chunk -state.encoder.text_compression: use compressed text chunks for metadata -state.info_raw.colortype: color type of raw input image you provide -state.info_raw.bitdepth: bit depth of raw input image you provide -state.info_raw: more color settings, see struct LodePNGColorMode -state.info_png.color.colortype: desired color type if auto_convert is false -state.info_png.color.bitdepth: desired bit depth if auto_convert is false -state.info_png.color....: more color settings, see struct LodePNGColorMode -state.info_png....: more PNG related settings, see struct LodePNGInfo - - -12. changes ------------ - -The version number of LodePNG is the date of the change given in the format -yyyymmdd. - -Some changes aren't backwards compatible. Those are indicated with a (!) -symbol. - -*) 11 jun 2018: less restrictive check for pixel size integer overflow -*) 14 jan 2018: allow optionally ignoring a few more recoverable errors -*) 17 sep 2017: fix memory leak for some encoder input error cases -*) 27 nov 2016: grey+alpha auto color model detection bugfix -*) 18 apr 2016: Changed qsort to custom stable sort (for platforms w/o qsort). -*) 09 apr 2016: Fixed colorkey usage detection, and better file loading (within - the limits of pure C90). -*) 08 dec 2015: Made load_file function return error if file can't be opened. -*) 24 okt 2015: Bugfix with decoding to palette output. -*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding. -*) 23 aug 2014: Reduced needless memory usage of decoder. -*) 28 jun 2014: Removed fix_png setting, always support palette OOB for - simplicity. Made ColorProfile public. -*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization. -*) 22 dec 2013: Power of two windowsize required for optimization. -*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key. -*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png). -*) 11 mar 2013 (!): Bugfix with custom free. Changed from "my" to "lodepng_" - prefix for the custom allocators and made it possible with a new #define to - use custom ones in your project without needing to change lodepng's code. -*) 28 jan 2013: Bugfix with color key. -*) 27 okt 2012: Tweaks in text chunk keyword length error handling. -*) 8 okt 2012 (!): Added new filter strategy (entropy) and new auto color mode. - (no palette). Better deflate tree encoding. New compression tweak settings. - Faster color conversions while decoding. Some internal cleanups. -*) 23 sep 2012: Reduced warnings in Visual Studio a little bit. -*) 1 sep 2012 (!): Removed #define's for giving custom (de)compression functions - and made it work with function pointers instead. -*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc - and free functions and toggle #defines from compiler flags. Small fixes. -*) 6 may 2012 (!): Made plugging in custom zlib/deflate functions more flexible. -*) 22 apr 2012 (!): Made interface more consistent, renaming a lot. Removed - redundant C++ codec classes. Reduced amount of structs. Everything changed, - but it is cleaner now imho and functionality remains the same. Also fixed - several bugs and shrunk the implementation code. Made new samples. -*) 6 nov 2011 (!): By default, the encoder now automatically chooses the best - PNG color model and bit depth, based on the amount and type of colors of the - raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color. -*) 9 okt 2011: simpler hash chain implementation for the encoder. -*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching. -*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking. - A bug with the PNG filtertype heuristic was fixed, so that it chooses much - better ones (it's quite significant). A setting to do an experimental, slow, - brute force search for PNG filter types is added. -*) 17 aug 2011 (!): changed some C zlib related function names. -*) 16 aug 2011: made the code less wide (max 120 characters per line). -*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors. -*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled. -*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman - to optimize long sequences of zeros. -*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and - LodePNG_InfoColor_canHaveAlpha functions for convenience. -*) 7 nov 2010: added LodePNG_error_text function to get error code description. -*) 30 okt 2010: made decoding slightly faster -*) 26 okt 2010: (!) changed some C function and struct names (more consistent). - Reorganized the documentation and the declaration order in the header. -*) 08 aug 2010: only changed some comments and external samples. -*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version. -*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers. -*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could - read by ignoring the problem but windows apps couldn't. -*) 06 jun 2008: added more error checks for out of memory cases. -*) 26 apr 2008: added a few more checks here and there to ensure more safety. -*) 06 mar 2008: crash with encoding of strings fixed -*) 02 feb 2008: support for international text chunks added (iTXt) -*) 23 jan 2008: small cleanups, and #defines to divide code in sections -*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. -*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. -*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added - Also various fixes, such as in the deflate and the padding bits code. -*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved - filtering code of encoder. -*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A - C++ wrapper around this provides an interface almost identical to before. - Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code - are together in these files but it works both for C and C++ compilers. -*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks -*) 30 aug 2007: bug fixed which makes this Borland C++ compatible -*) 09 aug 2007: some VS2005 warnings removed again -*) 21 jul 2007: deflate code placed in new namespace separate from zlib code -*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images -*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing - invalid std::vector element [0] fixed, and level 3 and 4 warnings removed -*) 02 jun 2007: made the encoder add a tag with version by default -*) 27 may 2007: zlib and png code separated (but still in the same file), - simple encoder/decoder functions added for more simple usage cases -*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), - moved some examples from here to lodepng_examples.cpp -*) 12 may 2007: palette decoding bug fixed -*) 24 apr 2007: changed the license from BSD to the zlib license -*) 11 mar 2007: very simple addition: ability to encode bKGD chunks. -*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding - palettized PNG images. Plus little interface change with palette and texts. -*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. - Fixed a bug where the end code of a block had length 0 in the Huffman tree. -*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented - and supported by the encoder, resulting in smaller PNGs at the output. -*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. -*) 24 jan 2007: gave encoder an error interface. Added color conversion from any - greyscale type to 8-bit greyscale with or without alpha. -*) 21 jan 2007: (!) Totally changed the interface. It allows more color types - to convert to and is more uniform. See the manual for how it works now. -*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: - encode/decode custom tEXt chunks, separate classes for zlib & deflate, and - at last made the decoder give errors for incorrect Adler32 or Crc. -*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. -*) 29 dec 2006: Added support for encoding images without alpha channel, and - cleaned out code as well as making certain parts faster. -*) 28 dec 2006: Added "Settings" to the encoder. -*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. - Removed some code duplication in the decoder. Fixed little bug in an example. -*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. - Fixed a bug of the decoder with 16-bit per color. -*) 15 okt 2006: Changed documentation structure -*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the - given image buffer, however for now it's not compressed. -*) 08 sep 2006: (!) Changed to interface with a Decoder class -*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different - way. Renamed decodePNG to decodePNGGeneric. -*) 29 jul 2006: (!) Changed the interface: image info is now returned as a - struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. -*) 28 jul 2006: Cleaned the code and added new error checks. - Corrected terminology "deflate" into "inflate". -*) 23 jun 2006: Added SDL example in the documentation in the header, this - example allows easy debugging by displaying the PNG and its transparency. -*) 22 jun 2006: (!) Changed way to obtain error value. Added - loadFile function for convenience. Made decodePNG32 faster. -*) 21 jun 2006: (!) Changed type of info vector to unsigned. - Changed position of palette in info vector. Fixed an important bug that - happened on PNGs with an uncompressed block. -*) 16 jun 2006: Internally changed unsigned into unsigned where - needed, and performed some optimizations. -*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them - in LodePNG namespace. Changed the order of the parameters. Rewrote the - documentation in the header. Renamed files to lodepng.cpp and lodepng.h -*) 22 apr 2006: Optimized and improved some code -*) 07 sep 2005: (!) Changed to std::vector interface -*) 12 aug 2005: Initial release (C++, decoder only) - - -13. contact information ------------------------ - -Feel free to contact me with suggestions, problems, comments, ... concerning -LodePNG. If you encounter a PNG image that doesn't work properly with this -decoder, feel free to send it and I'll use it to find and fix the problem. - -My email address is (puzzle the account and domain together with an @ symbol): -Domain: gmail dot com. -Account: lode dot vandevenne. - - -Copyright (c) 2005-2018 Lode Vandevenne -*/ +/* +LodePNG version 20190914 + +Copyright (c) 2005-2019 Lode Vandevenne + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +#ifndef LODEPNG_H +#define LODEPNG_H + +#include /*for size_t*/ + +extern const char* LODEPNG_VERSION_STRING; + +/* +The following #defines are used to create code sections. They can be disabled +to disable code sections, which can give faster compile time and smaller binary. +The "NO_COMPILE" defines are designed to be used to pass as defines to the +compiler command to disable them without modifying this header, e.g. +-DLODEPNG_NO_COMPILE_ZLIB for gcc. +In addition to those below, you can also define LODEPNG_NO_COMPILE_CRC to +allow implementing a custom lodepng_crc32. +*/ +/*deflate & zlib. If disabled, you must specify alternative zlib functions in +the custom_zlib field of the compress and decompress settings*/ +#ifndef LODEPNG_NO_COMPILE_ZLIB +#define LODEPNG_COMPILE_ZLIB +#endif + +/*png encoder and png decoder*/ +#ifndef LODEPNG_NO_COMPILE_PNG +#define LODEPNG_COMPILE_PNG +#endif + +/*deflate&zlib decoder and png decoder*/ +#ifndef LODEPNG_NO_COMPILE_DECODER +#define LODEPNG_COMPILE_DECODER +#endif + +/*deflate&zlib encoder and png encoder*/ +#ifndef LODEPNG_NO_COMPILE_ENCODER +#define LODEPNG_COMPILE_ENCODER +#endif + +/*the optional built in harddisk file loading and saving functions*/ +#ifndef LODEPNG_NO_COMPILE_DISK +#define LODEPNG_COMPILE_DISK +#endif + +/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/ +#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS +#define LODEPNG_COMPILE_ANCILLARY_CHUNKS +#endif + +/*ability to convert error numerical codes to English text string*/ +#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT +#define LODEPNG_COMPILE_ERROR_TEXT +#endif + +/*Compile the default allocators (C's free, malloc and realloc). If you disable this, +you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your +source files with custom allocators.*/ +#ifndef LODEPNG_NO_COMPILE_ALLOCATORS +#define LODEPNG_COMPILE_ALLOCATORS +#endif + +/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/ +#ifdef __cplusplus +#ifndef LODEPNG_NO_COMPILE_CPP +#define LODEPNG_COMPILE_CPP +#endif +#endif + +#ifdef LODEPNG_COMPILE_CPP +#include +#include +#endif /*LODEPNG_COMPILE_CPP*/ + +#ifdef LODEPNG_COMPILE_PNG +/*The PNG color types (also used for raw image).*/ +typedef enum LodePNGColorType { + LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/ + LCT_RGB = 2, /*RGB: 8,16 bit*/ + LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ + LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/ + LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/ + /*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid + byte value from 0 to 255 that could be present in an invalid PNG file header. Do + not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use + the valid color type names above, or numeric values like 1 or 7 when checking for + particular disallowed color type byte values, or cast to integer to print it.*/ + LCT_MAX_OCTET_VALUE = 255 +} LodePNGColorType; + +#ifdef LODEPNG_COMPILE_DECODER +/* +Converts PNG data in memory to raw pixel data. +out: Output parameter. Pointer to buffer that will contain the raw pixel data. + After decoding, its size is w * h * (bytes per pixel) bytes larger than + initially. Bytes per pixel depends on colortype and bitdepth. + Must be freed after usage with free(*out). + Note: for 16-bit per channel colors, uses big endian format like PNG does. +w: Output parameter. Pointer to width of pixel data. +h: Output parameter. Pointer to height of pixel data. +in: Memory buffer with the PNG file. +insize: size of the in buffer. +colortype: the desired color type for the raw output image. See explanation on PNG color types. +bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types. +Return value: LodePNG error code (0 means no error). +*/ +unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/ +unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize); + +/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/ +unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize); + +#ifdef LODEPNG_COMPILE_DISK +/* +Load PNG from disk, from file with given name. +Same as the other decode functions, but instead takes a filename as input. +*/ +unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.*/ +unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename); + +/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.*/ +unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ +#endif /*LODEPNG_COMPILE_DECODER*/ + + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Converts raw pixel data into a PNG image in memory. The colortype and bitdepth + of the output PNG image cannot be chosen, they are automatically determined + by the colortype, bitdepth and content of the input pixel data. + Note: for 16-bit per channel colors, needs big endian format like PNG does. +out: Output parameter. Pointer to buffer that will contain the PNG image data. + Must be freed after usage with free(*out). +outsize: Output parameter. Pointer to the size in bytes of the out buffer. +image: The raw pixel data to encode. The size of this buffer should be + w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth. +w: width of the raw pixel data in pixels. +h: height of the raw pixel data in pixels. +colortype: the color type of the raw input image. See explanation on PNG color types. +bitdepth: the bit depth of the raw input image. See explanation on PNG color types. +Return value: LodePNG error code (0 means no error). +*/ +unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/ +unsigned lodepng_encode32(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h); + +/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/ +unsigned lodepng_encode24(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h); + +#ifdef LODEPNG_COMPILE_DISK +/* +Converts raw pixel data into a PNG file on disk. +Same as the other encode functions, but instead takes a filename as output. +NOTE: This overwrites existing files without warning! +*/ +unsigned lodepng_encode_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.*/ +unsigned lodepng_encode32_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h); + +/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.*/ +unsigned lodepng_encode24_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h); +#endif /*LODEPNG_COMPILE_DISK*/ +#endif /*LODEPNG_COMPILE_ENCODER*/ + + +#ifdef LODEPNG_COMPILE_CPP +namespace lodepng { +#ifdef LODEPNG_COMPILE_DECODER +/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype +is the format to output the pixels to. Default is RGBA 8-bit per channel.*/ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const unsigned char* in, size_t insize, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const std::vector& in, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#ifdef LODEPNG_COMPILE_DISK +/* +Converts PNG file from disk to raw pixel data in memory. +Same as the other decode functions, but instead takes a filename as input. +*/ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const std::string& filename, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_DECODER */ + +#ifdef LODEPNG_COMPILE_ENCODER +/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype +is that of the raw input data. The output PNG color type will be auto chosen.*/ +unsigned encode(std::vector& out, + const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#ifdef LODEPNG_COMPILE_DISK +/* +Converts 32-bit RGBA raw pixel data into a PNG file on disk. +Same as the other encode functions, but instead takes a filename as output. +NOTE: This overwrites existing files without warning! +*/ +unsigned encode(const std::string& filename, + const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned encode(const std::string& filename, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_ENCODER */ +} /* namespace lodepng */ +#endif /*LODEPNG_COMPILE_CPP*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_ERROR_TEXT +/*Returns an English description of the numerical error code.*/ +const char* lodepng_error_text(unsigned code); +#endif /*LODEPNG_COMPILE_ERROR_TEXT*/ + +#ifdef LODEPNG_COMPILE_DECODER +/*Settings for zlib decompression*/ +typedef struct LodePNGDecompressSettings LodePNGDecompressSettings; +struct LodePNGDecompressSettings { + /* Check LodePNGDecoderSettings for more ignorable errors such as ignore_crc */ + unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ + unsigned ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/ + + /*use custom zlib decoder instead of built in one (default: null)*/ + unsigned (*custom_zlib)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGDecompressSettings*); + /*use custom deflate decoder instead of built in one (default: null) + if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate)*/ + unsigned (*custom_inflate)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGDecompressSettings*); + + const void* custom_context; /*optional custom settings for custom functions*/ +}; + +extern const LodePNGDecompressSettings lodepng_default_decompress_settings; +void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Settings for zlib compression. Tweaking these settings tweaks the balance +between speed and compression ratio. +*/ +typedef struct LodePNGCompressSettings LodePNGCompressSettings; +struct LodePNGCompressSettings /*deflate = compress*/ { + /*LZ77 related settings*/ + unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/ + unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/ + unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/ + unsigned minmatch; /*minimum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/ + unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/ + unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/ + + /*use custom zlib encoder instead of built in one (default: null)*/ + unsigned (*custom_zlib)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGCompressSettings*); + /*use custom deflate encoder instead of built in one (default: null) + if custom_zlib is used, custom_deflate is ignored since only the built in + zlib function will call custom_deflate*/ + unsigned (*custom_deflate)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGCompressSettings*); + + const void* custom_context; /*optional custom settings for custom functions*/ +}; + +extern const LodePNGCompressSettings lodepng_default_compress_settings; +void lodepng_compress_settings_init(LodePNGCompressSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_PNG +/* +Color mode of an image. Contains all information required to decode the pixel +bits to RGBA colors. This information is the same as used in the PNG file +format, and is used both for PNG and raw image data in LodePNG. +*/ +typedef struct LodePNGColorMode { + /*header (IHDR)*/ + LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ + unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ + + /* + palette (PLTE and tRNS) + + Dynamically allocated with the colors of the palette, including alpha. + When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use + lodepng_palette_clear, then for each color use lodepng_palette_add. + If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette. + + When decoding, by default you can ignore this palette, since LodePNG already + fills the palette colors in the pixels of the raw RGBA output. + + The palette is only supported for color type 3. + */ + unsigned char* palette; /*palette in RGBARGBA... order. When allocated, must be either 0, or have size 1024*/ + size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/ + + /* + transparent color key (tRNS) + + This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. + For grayscale PNGs, r, g and b will all 3 be set to the same. + + When decoding, by default you can ignore this information, since LodePNG sets + pixels with this key to transparent already in the raw RGBA output. + + The color key is only supported for color types 0 and 2. + */ + unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ + unsigned key_r; /*red/grayscale component of color key*/ + unsigned key_g; /*green component of color key*/ + unsigned key_b; /*blue component of color key*/ +} LodePNGColorMode; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_color_mode_init(LodePNGColorMode* info); +void lodepng_color_mode_cleanup(LodePNGColorMode* info); +/*return value is error code (0 means no error)*/ +unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source); +/* Makes a temporary LodePNGColorMode that does not need cleanup (no palette) */ +LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth); + +void lodepng_palette_clear(LodePNGColorMode* info); +/*add 1 color to the palette*/ +unsigned lodepng_palette_add(LodePNGColorMode* info, + unsigned char r, unsigned char g, unsigned char b, unsigned char a); + +/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/ +unsigned lodepng_get_bpp(const LodePNGColorMode* info); +/*get the amount of color channels used, based on colortype in the struct. +If a palette is used, it counts as 1 channel.*/ +unsigned lodepng_get_channels(const LodePNGColorMode* info); +/*is it a grayscale type? (only colortype 0 or 4)*/ +unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info); +/*has it got an alpha channel? (only colortype 2 or 6)*/ +unsigned lodepng_is_alpha_type(const LodePNGColorMode* info); +/*has it got a palette? (only colortype 3)*/ +unsigned lodepng_is_palette_type(const LodePNGColorMode* info); +/*only returns true if there is a palette and there is a value in the palette with alpha < 255. +Loops through the palette to check this.*/ +unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info); +/* +Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image. +Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels). +Returns false if the image can only have opaque pixels. +In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values, +or if "key_defined" is true. +*/ +unsigned lodepng_can_have_alpha(const LodePNGColorMode* info); +/*Returns the byte size of a raw image buffer with given width, height and color mode*/ +size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color); + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +/*The information of a Time chunk in PNG.*/ +typedef struct LodePNGTime { + unsigned year; /*2 bytes used (0-65535)*/ + unsigned month; /*1-12*/ + unsigned day; /*1-31*/ + unsigned hour; /*0-23*/ + unsigned minute; /*0-59*/ + unsigned second; /*0-60 (to allow for leap seconds)*/ +} LodePNGTime; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +/*Information about the PNG image, except pixels, width and height.*/ +typedef struct LodePNGInfo { + /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ + unsigned compression_method;/*compression method of the original file. Always 0.*/ + unsigned filter_method; /*filter method of the original file*/ + unsigned interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/ + LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /* + Suggested background color chunk (bKGD) + + This uses the same color mode and bit depth as the PNG (except no alpha channel), + with values truncated to the bit depth in the unsigned integer. + + For grayscale and palette PNGs, the value is stored in background_r. The values + in background_g and background_b are then unused. + + So when decoding, you may get these in a different color mode than the one you requested + for the raw pixels. + + When encoding with auto_convert, you must use the color model defined in info_png.color for + these values. The encoder normally ignores info_png.color when auto_convert is on, but will + use it to interpret these values (and convert copies of them to its chosen color model). + + When encoding, avoid setting this to an expensive color, such as a non-gray value + when the image is gray, or the compression will be worse since it will be forced to + write the PNG with a more expensive color mode (when auto_convert is on). + + The decoder does not use this background color to edit the color of pixels. This is a + completely optional metadata feature. + */ + unsigned background_defined; /*is a suggested background color given?*/ + unsigned background_r; /*red/gray/palette component of suggested background color*/ + unsigned background_g; /*green component of suggested background color*/ + unsigned background_b; /*blue component of suggested background color*/ + + /* + non-international text chunks (tEXt and zTXt) + + The char** arrays each contain num strings. The actual messages are in + text_strings, while text_keys are keywords that give a short description what + the actual text represents, e.g. Title, Author, Description, or anything else. + + All the string fields below including keys, names and language tags are null terminated. + The PNG specification uses null characters for the keys, names and tags, and forbids null + characters to appear in the main text which is why we can use null termination everywhere here. + + A keyword is minimum 1 character and maximum 79 characters long. It's + discouraged to use a single line length longer than 79 characters for texts. + + Don't allocate these text buffers yourself. Use the init/cleanup functions + correctly and use lodepng_add_text and lodepng_clear_text. + */ + size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/ + char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/ + char** text_strings; /*the actual text*/ + + /* + international text chunks (iTXt) + Similar to the non-international text chunks, but with additional strings + "langtags" and "transkeys". + */ + size_t itext_num; /*the amount of international texts in this PNG*/ + char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/ + char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ + char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/ + char** itext_strings; /*the actual international text - UTF-8 string*/ + + /*time chunk (tIME)*/ + unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/ + LodePNGTime time; + + /*phys chunk (pHYs)*/ + unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/ + unsigned phys_x; /*pixels per unit in x direction*/ + unsigned phys_y; /*pixels per unit in y direction*/ + unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ + + /* + Color profile related chunks: gAMA, cHRM, sRGB, iCPP + + LodePNG does not apply any color conversions on pixels in the encoder or decoder and does not interpret these color + profile values. It merely passes on the information. If you wish to use color profiles and convert colors, please + use these values with a color management library. + + See the PNG, ICC and sRGB specifications for more information about the meaning of these values. + */ + + /* gAMA chunk: optional, overridden by sRGB or iCCP if those are present. */ + unsigned gama_defined; /* Whether a gAMA chunk is present (0 = not present, 1 = present). */ + unsigned gama_gamma; /* Gamma exponent times 100000 */ + + /* cHRM chunk: optional, overridden by sRGB or iCCP if those are present. */ + unsigned chrm_defined; /* Whether a cHRM chunk is present (0 = not present, 1 = present). */ + unsigned chrm_white_x; /* White Point x times 100000 */ + unsigned chrm_white_y; /* White Point y times 100000 */ + unsigned chrm_red_x; /* Red x times 100000 */ + unsigned chrm_red_y; /* Red y times 100000 */ + unsigned chrm_green_x; /* Green x times 100000 */ + unsigned chrm_green_y; /* Green y times 100000 */ + unsigned chrm_blue_x; /* Blue x times 100000 */ + unsigned chrm_blue_y; /* Blue y times 100000 */ + + /* + sRGB chunk: optional. May not appear at the same time as iCCP. + If gAMA is also present gAMA must contain value 45455. + If cHRM is also present cHRM must contain respectively 31270,32900,64000,33000,30000,60000,15000,6000. + */ + unsigned srgb_defined; /* Whether an sRGB chunk is present (0 = not present, 1 = present). */ + unsigned srgb_intent; /* Rendering intent: 0=perceptual, 1=rel. colorimetric, 2=saturation, 3=abs. colorimetric */ + + /* + iCCP chunk: optional. May not appear at the same time as sRGB. + + LodePNG does not parse or use the ICC profile (except its color space header field for an edge case), a + separate library to handle the ICC data (not included in LodePNG) format is needed to use it for color + management and conversions. + + For encoding, if iCCP is present, gAMA and cHRM are recommended to be added as well with values that match the ICC + profile as closely as possible, if you wish to do this you should provide the correct values for gAMA and cHRM and + enable their '_defined' flags since LodePNG will not automatically compute them from the ICC profile. + + For encoding, the ICC profile is required by the PNG specification to be an "RGB" profile for non-gray + PNG color types and a "GRAY" profile for gray PNG color types. If you disable auto_convert, you must ensure + the ICC profile type matches your requested color type, else the encoder gives an error. If auto_convert is + enabled (the default), and the ICC profile is not a good match for the pixel data, this will result in an encoder + error if the pixel data has non-gray pixels for a GRAY profile, or a silent less-optimal compression of the pixel + data if the pixels could be encoded as grayscale but the ICC profile is RGB. + + To avoid this do not set an ICC profile in the image unless there is a good reason for it, and when doing so + make sure you compute it carefully to avoid the above problems. + */ + unsigned iccp_defined; /* Whether an iCCP chunk is present (0 = not present, 1 = present). */ + char* iccp_name; /* Null terminated string with profile name, 1-79 bytes */ + /* + The ICC profile in iccp_profile_size bytes. + Don't allocate this buffer yourself. Use the init/cleanup functions + correctly and use lodepng_set_icc and lodepng_clear_icc. + */ + unsigned char* iccp_profile; + unsigned iccp_profile_size; /* The size of iccp_profile in bytes */ + + /* End of color profile related chunks */ + + + /* + unknown chunks: chunks not known by LodePNG, passed on byte for byte. + + There are 3 buffers, one for each position in the PNG where unknown chunks can appear. + Each buffer contains all unknown chunks for that position consecutively. + The 3 positions are: + 0: between IHDR and PLTE, 1: between PLTE and IDAT, 2: between IDAT and IEND. + + For encoding, do not store critical chunks or known chunks that are enabled with a "_defined" flag + above in here, since the encoder will blindly follow this and could then encode an invalid PNG file + (such as one with two IHDR chunks or the disallowed combination of sRGB with iCCP). But do use + this if you wish to store an ancillary chunk that is not supported by LodePNG (such as sPLT or hIST), + or any non-standard PNG chunk. + + Do not allocate or traverse this data yourself. Use the chunk traversing functions declared + later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct. + */ + unsigned char* unknown_chunks_data[3]; + size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGInfo; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_info_init(LodePNGInfo* info); +void lodepng_info_cleanup(LodePNGInfo* info); +/*return value is error code (0 means no error)*/ +unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source); + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/ +void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ + +unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, + const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ +void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/ + +/*replaces if exists*/ +unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size); +void lodepng_clear_icc(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +/* +Converts raw buffer from one color type to another color type, based on +LodePNGColorMode structs to describe the input and output color type. +See the reference manual at the end of this header file to see which color conversions are supported. +return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported) +The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel +of the output color type (lodepng_get_bpp). +For < 8 bpp images, there should not be padding bits at the end of scanlines. +For 16-bit per channel colors, uses big endian format like PNG does. +Return value is LodePNG error code +*/ +unsigned lodepng_convert(unsigned char* out, const unsigned char* in, + const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, + unsigned w, unsigned h); + +#ifdef LODEPNG_COMPILE_DECODER +/* +Settings for the decoder. This contains settings for the PNG and the Zlib +decoder, but not the Info settings from the Info structs. +*/ +typedef struct LodePNGDecoderSettings { + LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ + + /* Check LodePNGDecompressSettings for more ignorable errors such as ignore_adler32 */ + unsigned ignore_crc; /*ignore CRC checksums*/ + unsigned ignore_critical; /*ignore unknown critical chunks*/ + unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/ + /* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable + errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some + strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters + in string keys, etc... */ + + unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/ + /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/ + unsigned remember_unknown_chunks; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGDecoderSettings; + +void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/ +typedef enum LodePNGFilterStrategy { + /*every filter at zero*/ + LFS_ZERO = 0, + /*every filter at 1, 2, 3 or 4 (paeth), unlike LFS_ZERO not a good choice, but for testing*/ + LFS_ONE = 1, + LFS_TWO = 2, + LFS_THREE = 3, + LFS_FOUR = 4, + /*Use filter that gives minimum sum, as described in the official PNG filter heuristic.*/ + LFS_MINSUM, + /*Use the filter type that gives smallest Shannon entropy for this scanline. Depending + on the image, this is better or worse than minsum.*/ + LFS_ENTROPY, + /* + Brute-force-search PNG filters by compressing each filter for each scanline. + Experimental, very slow, and only rarely gives better compression than MINSUM. + */ + LFS_BRUTE_FORCE, + /*use predefined_filters buffer: you specify the filter type for each scanline*/ + LFS_PREDEFINED +} LodePNGFilterStrategy; + +/*Gives characteristics about the integer RGBA colors of the image (count, alpha channel usage, bit depth, ...), +which helps decide which color model to use for encoding. +Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/ +typedef struct LodePNGColorStats { + unsigned colored; /*not grayscale*/ + unsigned key; /*image is not opaque and color key is possible instead of full alpha*/ + unsigned short key_r; /*key values, always as 16-bit, in 8-bit case the byte is duplicated, e.g. 65535 means 255*/ + unsigned short key_g; + unsigned short key_b; + unsigned alpha; /*image is not opaque and alpha channel or alpha palette required*/ + unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16 or allow_palette is disabled.*/ + unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order, only valid when numcolors is valid*/ + unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for grayscale only. 16 if 16-bit per channel required.*/ + size_t numpixels; + + /*user settings for computing/using the stats*/ + unsigned allow_palette; /*default 1. if 0, disallow choosing palette colortype in auto_choose_color, and don't count numcolors*/ + unsigned allow_greyscale; /*default 1. if 0, choose RGB or RGBA even if the image only has gray colors*/ +} LodePNGColorStats; + +void lodepng_color_stats_init(LodePNGColorStats* stats); + +/*Get a LodePNGColorStats of the image. The stats must already have been inited.*/ +void lodepng_compute_color_stats(LodePNGColorStats* stats, + const unsigned char* image, unsigned w, unsigned h, + const LodePNGColorMode* mode_in); +/*Computes a minimal PNG color model that can contain all colors as indicated by the stats and it settings. +The stats should be computed with lodepng_compute_color_stats. +mode_in is raw color profile of the image the stats were computed on, to copy palette order from when relevant. +Minimal PNG color model means the color type and bit depth that gives smallest amount of bits in the output image, +e.g. gray if only grayscale pixels, palette if less than 256 colors, color key if only single transparent color, ... +LodePNG uses this function internally if auto_convert is enabled (it is by default). +*/ +unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, + const LodePNGColorMode* mode_in, + const LodePNGColorMode* stats); + +/*Settings for the encoder.*/ +typedef struct LodePNGEncoderSettings { + LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ + + unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/ + + /*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than + 8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to + completely follow the official PNG heuristic, filter_palette_zero must be true and + filter_strategy must be LFS_MINSUM*/ + unsigned filter_palette_zero; + /*Which filter strategy to use when not using zeroes due to filter_palette_zero. + Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/ + LodePNGFilterStrategy filter_strategy; + /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with + the same length as the amount of scanlines in the image, and each value must <= 5. You + have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero + must be set to 0 to ensure this is also used on palette or low bitdepth images.*/ + const unsigned char* predefined_filters; + + /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). + If colortype is 3, PLTE is _always_ created.*/ + unsigned force_palette; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*add LodePNG identifier and version as a text chunk, for debugging*/ + unsigned add_id; + /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ + unsigned text_compression; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGEncoderSettings; + +void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ + + +#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) +/*The settings, state and information for extended encoding and decoding.*/ +typedef struct LodePNGState { +#ifdef LODEPNG_COMPILE_DECODER + LodePNGDecoderSettings decoder; /*the decoding settings*/ +#endif /*LODEPNG_COMPILE_DECODER*/ +#ifdef LODEPNG_COMPILE_ENCODER + LodePNGEncoderSettings encoder; /*the encoding settings*/ +#endif /*LODEPNG_COMPILE_ENCODER*/ + LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ + LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ + unsigned error; +#ifdef LODEPNG_COMPILE_CPP + /* For the lodepng::State subclass. */ + virtual ~LodePNGState(){} +#endif +} LodePNGState; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_state_init(LodePNGState* state); +void lodepng_state_cleanup(LodePNGState* state); +void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source); +#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ + +#ifdef LODEPNG_COMPILE_DECODER +/* +Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and +getting much more information about the PNG image and color mode. +*/ +unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize); + +/* +Read the PNG header, but not the actual data. This returns only the information +that is in the IHDR chunk of the PNG, such as width, height and color type. The +information is placed in the info_png field of the LodePNGState. +*/ +unsigned lodepng_inspect(unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize); +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* +Reads one metadata chunk (other than IHDR) of the PNG file and outputs what it +read in the state. Returns error code on failure. +Use lodepng_inspect first with a new state, then e.g. lodepng_chunk_find_const +to find the desired chunk type, and if non null use lodepng_inspect_chunk (with +chunk_pointer - start_of_file as pos). +Supports most metadata chunks from the PNG standard (gAMA, bKGD, tEXt, ...). +Ignores unsupported, unknown, non-metadata or IHDR chunks (without error). +Requirements: &in[pos] must point to start of a chunk, must use regular +lodepng_inspect first since format of most other chunks depends on IHDR, and if +there is a PLTE chunk, that one must be inspected before tRNS or bKGD. +*/ +unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos, + const unsigned char* in, size_t insize); + +#ifdef LODEPNG_COMPILE_ENCODER +/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/ +unsigned lodepng_encode(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h, + LodePNGState* state); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/* +The lodepng_chunk functions are normally not needed, except to traverse the +unknown chunks stored in the LodePNGInfo struct, or add new ones to it. +It also allows traversing the chunks of an encoded PNG file yourself. + +The chunk pointer always points to the beginning of the chunk itself, that is +the first byte of the 4 length bytes. + +In the PNG file format, chunks have the following format: +-4 bytes length: length of the data of the chunk in bytes (chunk itself is 12 bytes longer) +-4 bytes chunk type (ASCII a-z,A-Z only, see below) +-length bytes of data (may be 0 bytes if length was 0) +-4 bytes of CRC, computed on chunk name + data + +The first chunk starts at the 8th byte of the PNG file, the entire rest of the file +exists out of concatenated chunks with the above format. + +PNG standard chunk ASCII naming conventions: +-First byte: uppercase = critical, lowercase = ancillary +-Second byte: uppercase = public, lowercase = private +-Third byte: must be uppercase +-Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy +*/ + +/* +Gets the length of the data of the chunk. Total chunk length has 12 bytes more. +There must be at least 4 bytes to read from. If the result value is too large, +it may be corrupt data. +*/ +unsigned lodepng_chunk_length(const unsigned char* chunk); + +/*puts the 4-byte type in null terminated string*/ +void lodepng_chunk_type(char type[5], const unsigned char* chunk); + +/*check if the type is the given type*/ +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type); + +/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/ +unsigned char lodepng_chunk_ancillary(const unsigned char* chunk); + +/*0: public, 1: private (see PNG standard)*/ +unsigned char lodepng_chunk_private(const unsigned char* chunk); + +/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/ +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk); + +/*get pointer to the data of the chunk, where the input points to the header of the chunk*/ +unsigned char* lodepng_chunk_data(unsigned char* chunk); +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk); + +/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/ +unsigned lodepng_chunk_check_crc(const unsigned char* chunk); + +/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ +void lodepng_chunk_generate_crc(unsigned char* chunk); + +/* +Iterate to next chunks, allows iterating through all chunks of the PNG file. +Input must be at the beginning of a chunk (result of a previous lodepng_chunk_next call, +or the 8th byte of a PNG file which always has the first chunk), or alternatively may +point to the first byte of the PNG file (which is not a chunk but the magic header, the +function will then skip over it and return the first real chunk). +Expects at least 8 readable bytes of memory in the input pointer. +Will output pointer to the start of the next chunk or the end of the file if there +is no more chunk after this. Start this process at the 8th byte of the PNG file. +In a non-corrupt PNG file, the last chunk should have name "IEND". +*/ +unsigned char* lodepng_chunk_next(unsigned char* chunk); +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk); + +/*Finds the first chunk with the given type in the range [chunk, end), or returns NULL if not found.*/ +unsigned char* lodepng_chunk_find(unsigned char* chunk, const unsigned char* end, const char type[5]); +const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]); + +/* +Appends chunk to the data in out. The given chunk should already have its chunk header. +The out variable and outlength are updated to reflect the new reallocated buffer. +Returns error code (0 if it went ok) +*/ +unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk); + +/* +Appends new chunk to out. The chunk to append is given by giving its length, type +and data separately. The type is a 4-letter string. +The out variable and outlength are updated to reflect the new reallocated buffer. +Returne error code (0 if it went ok) +*/ +unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, + const char* type, const unsigned char* data); + + +/*Calculate CRC32 of buffer*/ +unsigned lodepng_crc32(const unsigned char* buf, size_t len); +#endif /*LODEPNG_COMPILE_PNG*/ + + +#ifdef LODEPNG_COMPILE_ZLIB +/* +This zlib part can be used independently to zlib compress and decompress a +buffer. It cannot be used to create gzip files however, and it only supports the +part of zlib that is required for PNG, it does not support dictionaries. +*/ + +#ifdef LODEPNG_COMPILE_DECODER +/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/ +unsigned lodepng_inflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings); + +/* +Decompresses Zlib data. Reallocates the out buffer and appends the data. The +data must be according to the zlib specification. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid +buffer and *outsize its size in bytes. out must be freed by user after usage. +*/ +unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Compresses data with Zlib. Reallocates the out buffer and appends the data. +Zlib adds a small header and trailer around the deflate data. +The data is output in the format of the zlib specification. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid +buffer and *outsize its size in bytes. out must be freed by user after usage. +*/ +unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings); + +/* +Find length-limited Huffman code for given frequencies. This function is in the +public interface only for tests, it's used internally by lodepng_deflate. +*/ +unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, + size_t numcodes, unsigned maxbitlen); + +/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/ +unsigned lodepng_deflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings); + +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +#ifdef LODEPNG_COMPILE_DISK +/* +Load a file from disk into buffer. The function allocates the out buffer, and +after usage you should free it. +out: output parameter, contains pointer to loaded buffer. +outsize: output parameter, size of the allocated out buffer +filename: the path to the file to load +return value: error code (0 means ok) +*/ +unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename); + +/* +Save a file from buffer to disk. Warning, if it exists, this function overwrites +the file without warning! +buffer: the buffer to write +buffersize: size of the buffer to write +filename: the path to the file to save to +return value: error code (0 means ok) +*/ +unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ + +#ifdef LODEPNG_COMPILE_CPP +/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */ +namespace lodepng { +#ifdef LODEPNG_COMPILE_PNG +class State : public LodePNGState { + public: + State(); + State(const State& other); + virtual ~State(); + State& operator=(const State& other); +}; + +#ifdef LODEPNG_COMPILE_DECODER +/* Same as other lodepng::decode, but using a State for more settings and information. */ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const unsigned char* in, size_t insize); +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const std::vector& in); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* Same as other lodepng::encode, but using a State for more settings and information. */ +unsigned encode(std::vector& out, + const unsigned char* in, unsigned w, unsigned h, + State& state); +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + State& state); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DISK +/* +Load a file from disk into an std::vector. +return value: error code (0 means ok) +*/ +unsigned load_file(std::vector& buffer, const std::string& filename); + +/* +Save the binary data in an std::vector to a file on disk. The file is overwritten +without warning. +*/ +unsigned save_file(const std::vector& buffer, const std::string& filename); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_PNG */ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_DECODER +/* Zlib-decompress an unsigned char buffer */ +unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); + +/* Zlib-decompress an std::vector */ +unsigned decompress(std::vector& out, const std::vector& in, + const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); +#endif /* LODEPNG_COMPILE_DECODER */ + +#ifdef LODEPNG_COMPILE_ENCODER +/* Zlib-compress an unsigned char buffer */ +unsigned compress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGCompressSettings& settings = lodepng_default_compress_settings); + +/* Zlib-compress an std::vector */ +unsigned compress(std::vector& out, const std::vector& in, + const LodePNGCompressSettings& settings = lodepng_default_compress_settings); +#endif /* LODEPNG_COMPILE_ENCODER */ +#endif /* LODEPNG_COMPILE_ZLIB */ +} /* namespace lodepng */ +#endif /*LODEPNG_COMPILE_CPP*/ + +/* +TODO: +[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often +[.] check compatibility with various compilers - done but needs to be redone for every newer version +[X] converting color to 16-bit per channel types +[X] support color profile chunk types (but never let them touch RGB values by default) +[ ] support all public PNG chunk types (almost done except sBIT, sPLT and hIST) +[ ] make sure encoder generates no chunks with size > (2^31)-1 +[ ] partial decoding (stream processing) +[X] let the "isFullyOpaque" function check color keys and transparent palettes too +[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" +[ ] allow treating some errors like warnings, when image is recoverable (e.g. 69, 57, 58) +[ ] make warnings like: oob palette, checksum fail, data after iend, wrong/unknown crit chunk, no null terminator in text, ... +[ ] error messages with line numbers (and version) +[ ] errors in state instead of as return code? +[ ] new errors/warnings like suspiciously big decompressed ztxt or iccp chunk +[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes +[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ... +[ ] allow user to give data (void*) to custom allocator +[ ] provide alternatives for C library functions not present on some platforms (memcpy, ...) +[ ] rename "grey" to "gray" everywhere since "color" also uses US spelling (keep "grey" copies for backwards compatibility) +*/ + +#endif /*LODEPNG_H inclusion guard*/ + +/* +LodePNG Documentation +--------------------- + +0. table of contents +-------------------- + + 1. about + 1.1. supported features + 1.2. features not supported + 2. C and C++ version + 3. security + 4. decoding + 5. encoding + 6. color conversions + 6.1. PNG color types + 6.2. color conversions + 6.3. padding bits + 6.4. A note about 16-bits per channel and endianness + 7. error values + 8. chunks and PNG editing + 9. compiler support + 10. examples + 10.1. decoder C++ example + 10.2. decoder C example + 11. state settings reference + 12. changes + 13. contact information + + +1. about +-------- + +PNG is a file format to store raster images losslessly with good compression, +supporting different color types and alpha channel. + +LodePNG is a PNG codec according to the Portable Network Graphics (PNG) +Specification (Second Edition) - W3C Recommendation 10 November 2003. + +The specifications used are: + +*) Portable Network Graphics (PNG) Specification (Second Edition): + http://www.w3.org/TR/2003/REC-PNG-20031110 +*) RFC 1950 ZLIB Compressed Data Format version 3.3: + http://www.gzip.org/zlib/rfc-zlib.html +*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: + http://www.gzip.org/zlib/rfc-deflate.html + +The most recent version of LodePNG can currently be found at +http://lodev.org/lodepng/ + +LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds +extra functionality. + +LodePNG exists out of two files: +-lodepng.h: the header file for both C and C++ +-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage + +If you want to start using LodePNG right away without reading this doc, get the +examples from the LodePNG website to see how to use it in code, or check the +smaller examples in chapter 13 here. + +LodePNG is simple but only supports the basic requirements. To achieve +simplicity, the following design choices were made: There are no dependencies +on any external library. There are functions to decode and encode a PNG with +a single function call, and extended versions of these functions taking a +LodePNGState struct allowing to specify or get more information. By default +the colors of the raw image are always RGB or RGBA, no matter what color type +the PNG file uses. To read and write files, there are simple functions to +convert the files to/from buffers in memory. + +This all makes LodePNG suitable for loading textures in games, demos and small +programs, ... It's less suitable for full fledged image editors, loading PNGs +over network (it requires all the image data to be available before decoding can +begin), life-critical systems, ... + +1.1. supported features +----------------------- + +The following features are supported by the decoder: + +*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, + or the same color type as the PNG +*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image +*) Adam7 interlace and deinterlace for any color type +*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk +*) support for alpha channels, including RGBA color model, translucent palettes and color keying +*) zlib decompression (inflate) +*) zlib compression (deflate) +*) CRC32 and ADLER32 checksums +*) colorimetric color profile conversions: currently experimentally available in lodepng_util.cpp only, + plus alternatively ability to pass on chroma/gamma/ICC profile information to other color management system. +*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. +*) the following chunks are supported by both encoder and decoder: + IHDR: header information + PLTE: color palette + IDAT: pixel data + IEND: the final chunk + tRNS: transparency for palettized images + tEXt: textual information + zTXt: compressed textual information + iTXt: international textual information + bKGD: suggested background color + pHYs: physical dimensions + tIME: modification time + cHRM: RGB chromaticities + gAMA: RGB gamma correction + iCCP: ICC color profile + sRGB: rendering intent + +1.2. features not supported +--------------------------- + +The following features are _not_ supported: + +*) some features needed to make a conformant PNG-Editor might be still missing. +*) partial loading/stream processing. All data must be available and is processed in one call. +*) The following public chunks are not (yet) supported but treated as unknown chunks by LodePNG: + sBIT + hIST + sPLT + + +2. C and C++ version +-------------------- + +The C version uses buffers allocated with alloc that you need to free() +yourself. You need to use init and cleanup functions for each struct whenever +using a struct from the C version to avoid exploits and memory leaks. + +The C++ version has extra functions with std::vectors in the interface and the +lodepng::State class which is a LodePNGState with constructor and destructor. + +These files work without modification for both C and C++ compilers because all +the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers +ignore it, and the C code is made to compile both with strict ISO C90 and C++. + +To use the C++ version, you need to rename the source file to lodepng.cpp +(instead of lodepng.c), and compile it with a C++ compiler. + +To use the C version, you need to rename the source file to lodepng.c (instead +of lodepng.cpp), and compile it with a C compiler. + + +3. Security +----------- + +Even if carefully designed, it's always possible that LodePNG contains possible +exploits. If you discover one, please let me know, and it will be fixed. + +When using LodePNG, care has to be taken with the C version of LodePNG, as well +as the C-style structs when working with C++. The following conventions are used +for all C-style structs: + +-if a struct has a corresponding init function, always call the init function when making a new one +-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks +-if a struct has a corresponding copy function, use the copy function instead of "=". + The destination must also be inited already. + + +4. Decoding +----------- + +Decoding converts a PNG compressed image to a raw pixel buffer. + +Most documentation on using the decoder is at its declarations in the header +above. For C, simple decoding can be done with functions such as +lodepng_decode32, and more advanced decoding can be done with the struct +LodePNGState and lodepng_decode. For C++, all decoding can be done with the +various lodepng::decode functions, and lodepng::State can be used for advanced +features. + +When using the LodePNGState, it uses the following fields for decoding: +*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here +*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get +*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use + +LodePNGInfo info_png +-------------------- + +After decoding, this contains extra information of the PNG image, except the actual +pixels, width and height because these are already gotten directly from the decoder +functions. + +It contains for example the original color type of the PNG image, text comments, +suggested background color, etc... More details about the LodePNGInfo struct are +at its declaration documentation. + +LodePNGColorMode info_raw +------------------------- + +When decoding, here you can specify which color type you want +the resulting raw image to be. If this is different from the colortype of the +PNG, then the decoder will automatically convert the result. This conversion +always works, except if you want it to convert a color PNG to grayscale or to +a palette with missing colors. + +By default, 32-bit color is used for the result. + +LodePNGDecoderSettings decoder +------------------------------ + +The settings can be used to ignore the errors created by invalid CRC and Adler32 +chunks, and to disable the decoding of tEXt chunks. + +There's also a setting color_convert, true by default. If false, no conversion +is done, the resulting data will be as it was in the PNG (after decompression) +and you'll have to puzzle the colors of the pixels together yourself using the +color type information in the LodePNGInfo. + + +5. Encoding +----------- + +Encoding converts a raw pixel buffer to a PNG compressed image. + +Most documentation on using the encoder is at its declarations in the header +above. For C, simple encoding can be done with functions such as +lodepng_encode32, and more advanced decoding can be done with the struct +LodePNGState and lodepng_encode. For C++, all encoding can be done with the +various lodepng::encode functions, and lodepng::State can be used for advanced +features. + +Like the decoder, the encoder can also give errors. However it gives less errors +since the encoder input is trusted, the decoder input (a PNG image that could +be forged by anyone) is not trusted. + +When using the LodePNGState, it uses the following fields for encoding: +*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be. +*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has +*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use + +LodePNGInfo info_png +-------------------- + +When encoding, you use this the opposite way as when decoding: for encoding, +you fill in the values you want the PNG to have before encoding. By default it's +not needed to specify a color type for the PNG since it's automatically chosen, +but it's possible to choose it yourself given the right settings. + +The encoder will not always exactly match the LodePNGInfo struct you give, +it tries as close as possible. Some things are ignored by the encoder. The +encoder uses, for example, the following settings from it when applicable: +colortype and bitdepth, text chunks, time chunk, the color key, the palette, the +background color, the interlace method, unknown chunks, ... + +When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk. +If the palette contains any colors for which the alpha channel is not 255 (so +there are translucent colors in the palette), it'll add a tRNS chunk. + +LodePNGColorMode info_raw +------------------------- + +You specify the color type of the raw image that you give to the input here, +including a possible transparent color key and palette you happen to be using in +your raw image data. + +By default, 32-bit color is assumed, meaning your input has to be in RGBA +format with 4 bytes (unsigned chars) per pixel. + +LodePNGEncoderSettings encoder +------------------------------ + +The following settings are supported (some are in sub-structs): +*) auto_convert: when this option is enabled, the encoder will +automatically choose the smallest possible color mode (including color key) that +can encode the colors of all pixels without information loss. +*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, + 2 = dynamic huffman tree (best compression). Should be 2 for proper + compression. +*) use_lz77: whether or not to use LZ77 for compressed block types. Should be + true for proper compression. +*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value + 2048 by default, but can be set to 32768 for better, but slow, compression. +*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE + chunk if force_palette is true. This can used as suggested palette to convert + to by viewers that don't support more than 256 colors (if those still exist) +*) add_id: add text chunk "Encoder: LodePNG " to the image. +*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks. + zTXt chunks use zlib compression on the text. This gives a smaller result on + large texts but a larger result on small texts (such as a single program name). + It's all tEXt or all zTXt though, there's no separate setting per text yet. + + +6. color conversions +-------------------- + +An important thing to note about LodePNG, is that the color type of the PNG, and +the color type of the raw image, are completely independent. By default, when +you decode a PNG, you get the result as a raw image in the color type you want, +no matter whether the PNG was encoded with a palette, grayscale or RGBA color. +And if you encode an image, by default LodePNG will automatically choose the PNG +color type that gives good compression based on the values of colors and amount +of colors in the image. It can be configured to let you control it instead as +well, though. + +To be able to do this, LodePNG does conversions from one color mode to another. +It can convert from almost any color type to any other color type, except the +following conversions: RGB to grayscale is not supported, and converting to a +palette when the palette doesn't have a required color is not supported. This is +not supported on purpose: this is information loss which requires a color +reduction algorithm that is beyond the scope of a PNG encoder (yes, RGB to gray +is easy, but there are multiple ways if you want to give some channels more +weight). + +By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB +color, no matter what color type the PNG has. And by default when encoding, +LodePNG automatically picks the best color model for the output PNG, and expects +the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control +the color format of the images yourself, you can skip this chapter. + +6.1. PNG color types +-------------------- + +A PNG image can have many color types, ranging from 1-bit color to 64-bit color, +as well as palettized color modes. After the zlib decompression and unfiltering +in the PNG image is done, the raw pixel data will have that color type and thus +a certain amount of bits per pixel. If you want the output raw image after +decoding to have another color type, a conversion is done by LodePNG. + +The PNG specification gives the following color types: + +0: grayscale, bit depths 1, 2, 4, 8, 16 +2: RGB, bit depths 8 and 16 +3: palette, bit depths 1, 2, 4 and 8 +4: grayscale with alpha, bit depths 8 and 16 +6: RGBA, bit depths 8 and 16 + +Bit depth is the amount of bits per pixel per color channel. So the total amount +of bits per pixel is: amount of channels * bitdepth. + +6.2. color conversions +---------------------- + +As explained in the sections about the encoder and decoder, you can specify +color types and bit depths in info_png and info_raw to change the default +behaviour. + +If, when decoding, you want the raw image to be something else than the default, +you need to set the color type and bit depth you want in the LodePNGColorMode, +or the parameters colortype and bitdepth of the simple decoding function. + +If, when encoding, you use another color type than the default in the raw input +image, you need to specify its color type and bit depth in the LodePNGColorMode +of the raw image, or use the parameters colortype and bitdepth of the simple +encoding function. + +If, when encoding, you don't want LodePNG to choose the output PNG color type +but control it yourself, you need to set auto_convert in the encoder settings +to false, and specify the color type you want in the LodePNGInfo of the +encoder (including palette: it can generate a palette if auto_convert is true, +otherwise not). + +If the input and output color type differ (whether user chosen or auto chosen), +LodePNG will do a color conversion, which follows the rules below, and may +sometimes result in an error. + +To avoid some confusion: +-the decoder converts from PNG to raw image +-the encoder converts from raw image to PNG +-the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image +-the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG +-when encoding, the color type in LodePNGInfo is ignored if auto_convert + is enabled, it is automatically generated instead +-when decoding, the color type in LodePNGInfo is set by the decoder to that of the original + PNG image, but it can be ignored since the raw image has the color type you requested instead +-if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion + between the color types is done if the color types are supported. If it is not + supported, an error is returned. If the types are the same, no conversion is done. +-even though some conversions aren't supported, LodePNG supports loading PNGs from any + colortype and saving PNGs to any colortype, sometimes it just requires preparing + the raw image correctly before encoding. +-both encoder and decoder use the same color converter. + +The function lodepng_convert does the color conversion. It is available in the +interface but normally isn't needed since the encoder and decoder already call +it. + +Non supported color conversions: +-color to grayscale when non-gray pixels are present: no error is thrown, but +the result will look ugly because only the red channel is taken (it assumes all +three channels are the same in this case so ignores green and blue). The reason +no error is given is to allow converting from three-channel grayscale images to +one-channel even if there are numerical imprecisions. +-anything to palette when the palette does not have an exact match for a from-color +in it: in this case an error is thrown + +Supported color conversions: +-anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA +-any gray or gray+alpha, to gray or gray+alpha +-anything to a palette, as long as the palette has the requested colors in it +-removing alpha channel +-higher to smaller bitdepth, and vice versa + +If you want no color conversion to be done (e.g. for speed or control): +-In the encoder, you can make it save a PNG with any color type by giving the +raw color mode and LodePNGInfo the same color mode, and setting auto_convert to +false. +-In the decoder, you can make it store the pixel data in the same color type +as the PNG has, by setting the color_convert setting to false. Settings in +info_raw are then ignored. + +6.3. padding bits +----------------- + +In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines +have a bit amount that isn't a multiple of 8, then padding bits are used so that each +scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output. +The raw input image you give to the encoder, and the raw output image you get from the decoder +will NOT have these padding bits, e.g. in the case of a 1-bit image with a width +of 7 pixels, the first pixel of the second scanline will the 8th bit of the first byte, +not the first bit of a new byte. + +6.4. A note about 16-bits per channel and endianness +---------------------------------------------------- + +LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like +for any other color format. The 16-bit values are stored in big endian (most +significant byte first) in these arrays. This is the opposite order of the +little endian used by x86 CPU's. + +LodePNG always uses big endian because the PNG file format does so internally. +Conversions to other formats than PNG uses internally are not supported by +LodePNG on purpose, there are myriads of formats, including endianness of 16-bit +colors, the order in which you store R, G, B and A, and so on. Supporting and +converting to/from all that is outside the scope of LodePNG. + +This may mean that, depending on your use case, you may want to convert the big +endian output of LodePNG to little endian with a for loop. This is certainly not +always needed, many applications and libraries support big endian 16-bit colors +anyway, but it means you cannot simply cast the unsigned char* buffer to an +unsigned short* buffer on x86 CPUs. + + +7. error values +--------------- + +All functions in LodePNG that return an error code, return 0 if everything went +OK, or a non-zero code if there was an error. + +The meaning of the LodePNG error values can be retrieved with the function +lodepng_error_text: given the numerical error code, it returns a description +of the error in English as a string. + +Check the implementation of lodepng_error_text to see the meaning of each code. + + +8. chunks and PNG editing +------------------------- + +If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG +editor that should follow the rules about handling of unknown chunks, or if your +program is able to read other types of chunks than the ones handled by LodePNG, +then that's possible with the chunk functions of LodePNG. + +A PNG chunk has the following layout: + +4 bytes length +4 bytes type name +length bytes data +4 bytes CRC + +8.1. iterating through chunks +----------------------------- + +If you have a buffer containing the PNG image data, then the first chunk (the +IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the +signature of the PNG and are not part of a chunk. But if you start at byte 8 +then you have a chunk, and can check the following things of it. + +NOTE: none of these functions check for memory buffer boundaries. To avoid +exploits, always make sure the buffer contains all the data of the chunks. +When using lodepng_chunk_next, make sure the returned value is within the +allocated memory. + +unsigned lodepng_chunk_length(const unsigned char* chunk): + +Get the length of the chunk's data. The total chunk length is this length + 12. + +void lodepng_chunk_type(char type[5], const unsigned char* chunk): +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type): + +Get the type of the chunk or compare if it's a certain type + +unsigned char lodepng_chunk_critical(const unsigned char* chunk): +unsigned char lodepng_chunk_private(const unsigned char* chunk): +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk): + +Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). +Check if the chunk is private (public chunks are part of the standard, private ones not). +Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical +chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your +program doesn't handle that type of unknown chunk. + +unsigned char* lodepng_chunk_data(unsigned char* chunk): +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk): + +Get a pointer to the start of the data of the chunk. + +unsigned lodepng_chunk_check_crc(const unsigned char* chunk): +void lodepng_chunk_generate_crc(unsigned char* chunk): + +Check if the crc is correct or generate a correct one. + +unsigned char* lodepng_chunk_next(unsigned char* chunk): +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk): + +Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these +functions do no boundary checking of the allocated data whatsoever, so make sure there is enough +data available in the buffer to be able to go to the next chunk. + +unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk): +unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, + const char* type, const unsigned char* data): + +These functions are used to create new chunks that are appended to the data in *out that has +length *outlength. The append function appends an existing chunk to the new data. The create +function creates a new chunk with the given parameters and appends it. Type is the 4-letter +name of the chunk. + +8.2. chunks in info_png +----------------------- + +The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3 +buffers (each with size) to contain 3 types of unknown chunks: +the ones that come before the PLTE chunk, the ones that come between the PLTE +and the IDAT chunks, and the ones that come after the IDAT chunks. +It's necessary to make the distinction between these 3 cases because the PNG +standard forces to keep the ordering of unknown chunks compared to the critical +chunks, but does not force any other ordering rules. + +info_png.unknown_chunks_data[0] is the chunks before PLTE +info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT +info_png.unknown_chunks_data[2] is the chunks after IDAT + +The chunks in these 3 buffers can be iterated through and read by using the same +way described in the previous subchapter. + +When using the decoder to decode a PNG, you can make it store all unknown chunks +if you set the option settings.remember_unknown_chunks to 1. By default, this +option is off (0). + +The encoder will always encode unknown chunks that are stored in the info_png. +If you need it to add a particular chunk that isn't known by LodePNG, you can +use lodepng_chunk_append or lodepng_chunk_create to the chunk data in +info_png.unknown_chunks_data[x]. + +Chunks that are known by LodePNG should not be added in that way. E.g. to make +LodePNG add a bKGD chunk, set background_defined to true and add the correct +parameters there instead. + + +9. compiler support +------------------- + +No libraries other than the current standard C library are needed to compile +LodePNG. For the C++ version, only the standard C++ library is needed on top. +Add the files lodepng.c(pp) and lodepng.h to your project, include +lodepng.h where needed, and your program can read/write PNG files. + +It is compatible with C90 and up, and C++03 and up. + +If performance is important, use optimization when compiling! For both the +encoder and decoder, this makes a large difference. + +Make sure that LodePNG is compiled with the same compiler of the same version +and with the same settings as the rest of the program, or the interfaces with +std::vectors and std::strings in C++ can be incompatible. + +CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. + +*) gcc and g++ + +LodePNG is developed in gcc so this compiler is natively supported. It gives no +warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ +version 4.7.1 on Linux, 32-bit and 64-bit. + +*) Clang + +Fully supported and warning-free. + +*) Mingw + +The Mingw compiler (a port of gcc for Windows) should be fully supported by +LodePNG. + +*) Visual Studio and Visual C++ Express Edition + +LodePNG should be warning-free with warning level W4. Two warnings were disabled +with pragmas though: warning 4244 about implicit conversions, and warning 4996 +where it wants to use a non-standard function fopen_s instead of the standard C +fopen. + +Visual Studio may want "stdafx.h" files to be included in each source file and +give an error "unexpected end of file while looking for precompiled header". +This is not standard C++ and will not be added to the stock LodePNG. You can +disable it for lodepng.cpp only by right clicking it, Properties, C/C++, +Precompiled Headers, and set it to Not Using Precompiled Headers there. + +NOTE: Modern versions of VS should be fully supported, but old versions, e.g. +VS6, are not guaranteed to work. + +*) Compilers on Macintosh + +LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for +C and C++. + +*) Other Compilers + +If you encounter problems on any compilers, feel free to let me know and I may +try to fix it if the compiler is modern and standards compliant. + + +10. examples +------------ + +This decoder example shows the most basic usage of LodePNG. More complex +examples can be found on the LodePNG website. + +10.1. decoder C++ example +------------------------- + +#include "lodepng.h" +#include + +int main(int argc, char *argv[]) { + const char* filename = argc > 1 ? argv[1] : "test.png"; + + //load and decode + std::vector image; + unsigned width, height; + unsigned error = lodepng::decode(image, width, height, filename); + + //if there's an error, display it + if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl; + + //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ... +} + +10.2. decoder C example +----------------------- + +#include "lodepng.h" + +int main(int argc, char *argv[]) { + unsigned error; + unsigned char* image; + size_t width, height; + const char* filename = argc > 1 ? argv[1] : "test.png"; + + error = lodepng_decode32_file(&image, &width, &height, filename); + + if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error)); + + / * use image here * / + + free(image); + return 0; +} + +11. state settings reference +---------------------------- + +A quick reference of some settings to set on the LodePNGState + +For decoding: + +state.decoder.zlibsettings.ignore_adler32: ignore ADLER32 checksums +state.decoder.zlibsettings.custom_...: use custom inflate function +state.decoder.ignore_crc: ignore CRC checksums +state.decoder.ignore_critical: ignore unknown critical chunks +state.decoder.ignore_end: ignore missing IEND chunk. May fail if this corruption causes other errors +state.decoder.color_convert: convert internal PNG color to chosen one +state.decoder.read_text_chunks: whether to read in text metadata chunks +state.decoder.remember_unknown_chunks: whether to read in unknown chunks +state.info_raw.colortype: desired color type for decoded image +state.info_raw.bitdepth: desired bit depth for decoded image +state.info_raw....: more color settings, see struct LodePNGColorMode +state.info_png....: no settings for decoder but ouput, see struct LodePNGInfo + +For encoding: + +state.encoder.zlibsettings.btype: disable compression by setting it to 0 +state.encoder.zlibsettings.use_lz77: use LZ77 in compression +state.encoder.zlibsettings.windowsize: tweak LZ77 windowsize +state.encoder.zlibsettings.minmatch: tweak min LZ77 length to match +state.encoder.zlibsettings.nicematch: tweak LZ77 match where to stop searching +state.encoder.zlibsettings.lazymatching: try one more LZ77 matching +state.encoder.zlibsettings.custom_...: use custom deflate function +state.encoder.auto_convert: choose optimal PNG color type, if 0 uses info_png +state.encoder.filter_palette_zero: PNG filter strategy for palette +state.encoder.filter_strategy: PNG filter strategy to encode with +state.encoder.force_palette: add palette even if not encoding to one +state.encoder.add_id: add LodePNG identifier and version as a text chunk +state.encoder.text_compression: use compressed text chunks for metadata +state.info_raw.colortype: color type of raw input image you provide +state.info_raw.bitdepth: bit depth of raw input image you provide +state.info_raw: more color settings, see struct LodePNGColorMode +state.info_png.color.colortype: desired color type if auto_convert is false +state.info_png.color.bitdepth: desired bit depth if auto_convert is false +state.info_png.color....: more color settings, see struct LodePNGColorMode +state.info_png....: more PNG related settings, see struct LodePNGInfo + + +12. changes +----------- + +The version number of LodePNG is the date of the change given in the format +yyyymmdd. + +Some changes aren't backwards compatible. Those are indicated with a (!) +symbol. + +Not all changes are listed here, the commit history in github lists more: +https://github.com/lvandeve/lodepng + +*) 14 aug 2019: around 25% faster decoding thanks to huffman lookup tables. +*) 15 jun 2019 (!): auto_choose_color API changed (for bugfix: don't use palette + if gray ICC profile) and non-ICC LodePNGColorProfile renamed to LodePNGColorStats. +*) 30 dec 2018: code style changes only: removed newlines before opening braces. +*) 10 sep 2018: added way to inspect metadata chunks without full decoding. +*) 19 aug 2018 (!): fixed color mode bKGD is encoded with and made it use + palette index in case of palette. +*) 10 aug 2018 (!): added support for gAMA, cHRM, sRGB and iCCP chunks. This + change is backwards compatible unless you relied on unknown_chunks for those. +*) 11 jun 2018: less restrictive check for pixel size integer overflow +*) 14 jan 2018: allow optionally ignoring a few more recoverable errors +*) 17 sep 2017: fix memory leak for some encoder input error cases +*) 27 nov 2016: grey+alpha auto color model detection bugfix +*) 18 apr 2016: Changed qsort to custom stable sort (for platforms w/o qsort). +*) 09 apr 2016: Fixed colorkey usage detection, and better file loading (within + the limits of pure C90). +*) 08 dec 2015: Made load_file function return error if file can't be opened. +*) 24 okt 2015: Bugfix with decoding to palette output. +*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding. +*) 24 aug 2014: Moved to github +*) 23 aug 2014: Reduced needless memory usage of decoder. +*) 28 jun 2014: Removed fix_png setting, always support palette OOB for + simplicity. Made ColorProfile public. +*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization. +*) 22 dec 2013: Power of two windowsize required for optimization. +*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key. +*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png). +*) 11 mar 2013 (!): Bugfix with custom free. Changed from "my" to "lodepng_" + prefix for the custom allocators and made it possible with a new #define to + use custom ones in your project without needing to change lodepng's code. +*) 28 jan 2013: Bugfix with color key. +*) 27 okt 2012: Tweaks in text chunk keyword length error handling. +*) 8 okt 2012 (!): Added new filter strategy (entropy) and new auto color mode. + (no palette). Better deflate tree encoding. New compression tweak settings. + Faster color conversions while decoding. Some internal cleanups. +*) 23 sep 2012: Reduced warnings in Visual Studio a little bit. +*) 1 sep 2012 (!): Removed #define's for giving custom (de)compression functions + and made it work with function pointers instead. +*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc + and free functions and toggle #defines from compiler flags. Small fixes. +*) 6 may 2012 (!): Made plugging in custom zlib/deflate functions more flexible. +*) 22 apr 2012 (!): Made interface more consistent, renaming a lot. Removed + redundant C++ codec classes. Reduced amount of structs. Everything changed, + but it is cleaner now imho and functionality remains the same. Also fixed + several bugs and shrunk the implementation code. Made new samples. +*) 6 nov 2011 (!): By default, the encoder now automatically chooses the best + PNG color model and bit depth, based on the amount and type of colors of the + raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color. +*) 9 okt 2011: simpler hash chain implementation for the encoder. +*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching. +*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking. + A bug with the PNG filtertype heuristic was fixed, so that it chooses much + better ones (it's quite significant). A setting to do an experimental, slow, + brute force search for PNG filter types is added. +*) 17 aug 2011 (!): changed some C zlib related function names. +*) 16 aug 2011: made the code less wide (max 120 characters per line). +*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors. +*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled. +*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman + to optimize long sequences of zeros. +*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and + LodePNG_InfoColor_canHaveAlpha functions for convenience. +*) 7 nov 2010: added LodePNG_error_text function to get error code description. +*) 30 okt 2010: made decoding slightly faster +*) 26 okt 2010: (!) changed some C function and struct names (more consistent). + Reorganized the documentation and the declaration order in the header. +*) 08 aug 2010: only changed some comments and external samples. +*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version. +*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers. +*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could + read by ignoring the problem but windows apps couldn't. +*) 06 jun 2008: added more error checks for out of memory cases. +*) 26 apr 2008: added a few more checks here and there to ensure more safety. +*) 06 mar 2008: crash with encoding of strings fixed +*) 02 feb 2008: support for international text chunks added (iTXt) +*) 23 jan 2008: small cleanups, and #defines to divide code in sections +*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. +*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. +*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added + Also various fixes, such as in the deflate and the padding bits code. +*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved + filtering code of encoder. +*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A + C++ wrapper around this provides an interface almost identical to before. + Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code + are together in these files but it works both for C and C++ compilers. +*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks +*) 30 aug 2007: bug fixed which makes this Borland C++ compatible +*) 09 aug 2007: some VS2005 warnings removed again +*) 21 jul 2007: deflate code placed in new namespace separate from zlib code +*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images +*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing + invalid std::vector element [0] fixed, and level 3 and 4 warnings removed +*) 02 jun 2007: made the encoder add a tag with version by default +*) 27 may 2007: zlib and png code separated (but still in the same file), + simple encoder/decoder functions added for more simple usage cases +*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), + moved some examples from here to lodepng_examples.cpp +*) 12 may 2007: palette decoding bug fixed +*) 24 apr 2007: changed the license from BSD to the zlib license +*) 11 mar 2007: very simple addition: ability to encode bKGD chunks. +*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding + palettized PNG images. Plus little interface change with palette and texts. +*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. + Fixed a bug where the end code of a block had length 0 in the Huffman tree. +*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented + and supported by the encoder, resulting in smaller PNGs at the output. +*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. +*) 24 jan 2007: gave encoder an error interface. Added color conversion from any + greyscale type to 8-bit greyscale with or without alpha. +*) 21 jan 2007: (!) Totally changed the interface. It allows more color types + to convert to and is more uniform. See the manual for how it works now. +*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: + encode/decode custom tEXt chunks, separate classes for zlib & deflate, and + at last made the decoder give errors for incorrect Adler32 or Crc. +*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. +*) 29 dec 2006: Added support for encoding images without alpha channel, and + cleaned out code as well as making certain parts faster. +*) 28 dec 2006: Added "Settings" to the encoder. +*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. + Removed some code duplication in the decoder. Fixed little bug in an example. +*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. + Fixed a bug of the decoder with 16-bit per color. +*) 15 okt 2006: Changed documentation structure +*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the + given image buffer, however for now it's not compressed. +*) 08 sep 2006: (!) Changed to interface with a Decoder class +*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different + way. Renamed decodePNG to decodePNGGeneric. +*) 29 jul 2006: (!) Changed the interface: image info is now returned as a + struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. +*) 28 jul 2006: Cleaned the code and added new error checks. + Corrected terminology "deflate" into "inflate". +*) 23 jun 2006: Added SDL example in the documentation in the header, this + example allows easy debugging by displaying the PNG and its transparency. +*) 22 jun 2006: (!) Changed way to obtain error value. Added + loadFile function for convenience. Made decodePNG32 faster. +*) 21 jun 2006: (!) Changed type of info vector to unsigned. + Changed position of palette in info vector. Fixed an important bug that + happened on PNGs with an uncompressed block. +*) 16 jun 2006: Internally changed unsigned into unsigned where + needed, and performed some optimizations. +*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them + in LodePNG namespace. Changed the order of the parameters. Rewrote the + documentation in the header. Renamed files to lodepng.cpp and lodepng.h +*) 22 apr 2006: Optimized and improved some code +*) 07 sep 2005: (!) Changed to std::vector interface +*) 12 aug 2005: Initial release (C++, decoder only) + + +13. contact information +----------------------- + +Feel free to contact me with suggestions, problems, comments, ... concerning +LodePNG. If you encounter a PNG image that doesn't work properly with this +decoder, feel free to send it and I'll use it to find and fix the problem. + +My email address is (puzzle the account and domain together with an @ symbol): +Domain: gmail dot com. +Account: lode dot vandevenne. + + +Copyright (c) 2005-2019 Lode Vandevenne +*/ diff --git a/Sources/Emu48/RESOURCE.H b/Sources/Emu48/RESOURCE.H index 474771f..16274ad 100644 --- a/Sources/Emu48/RESOURCE.H +++ b/Sources/Emu48/RESOURCE.H @@ -33,6 +33,7 @@ #define IDD_DEBUG_MEMSAVE 127 #define IDD_DEBUG_MEMLOAD 128 #define IDD_DEBUG_SETTINGS 129 +#define IDD_TRACE 130 #define IDC_REALSPEED 1000 #define IDC_GRAYSCALE 1001 #define IDC_ALWAYSONTOP 1002 @@ -169,6 +170,13 @@ #define IDC_MACRO_MANUAL 1133 #define IDC_SOUND_SLIDER 1134 #define IDC_SOUND_DEVICE 1135 +#define IDC_TRACE_FILE 1136 +#define IDC_TRACE_BROWSE 1137 +#define IDC_TRACE_NEW 1138 +#define IDC_TRACE_APPEND 1139 +#define IDC_TRACE_REGISTER 1140 +#define IDC_TRACE_MMU 1141 +#define IDC_TRACE_OPCODE 1142 #define ID_FILE_NEW 40001 #define ID_FILE_OPEN 40002 #define ID_FILE_SAVE 40003 @@ -239,15 +247,17 @@ #define ID_INFO_LASTINSTRUCTIONS 40069 #define ID_INFO_PROFILE 40070 #define ID_INFO_WRITEONLYREG 40071 +#define ID_TRACE_SETTINGS 40072 +#define ID_TRACE_ENABLE 40073 #define ID_FILE_MRU_FILE1 40100 // Next default values for new objects -// +// #ifdef APSTUDIO_INVOKED #ifndef APSTUDIO_READONLY_SYMBOLS -#define _APS_NEXT_RESOURCE_VALUE 130 -#define _APS_NEXT_COMMAND_VALUE 40072 -#define _APS_NEXT_CONTROL_VALUE 1136 +#define _APS_NEXT_RESOURCE_VALUE 131 +#define _APS_NEXT_COMMAND_VALUE 40074 +#define _APS_NEXT_CONTROL_VALUE 1143 #define _APS_NEXT_SYMED_VALUE 109 #endif #endif diff --git a/Sources/GCCPatch/EMU48GCC.RC b/Sources/GCCPatch/EMU48GCC.RC index 98717d6..9a455fc 100644 --- a/Sources/GCCPatch/EMU48GCC.RC +++ b/Sources/GCCPatch/EMU48GCC.RC @@ -206,6 +206,14 @@ BEGIN TOPMARGIN, 7 BOTTOMMARGIN, 109 END + + IDD_TRACE, DIALOG + BEGIN + LEFTMARGIN, 7 + RIGHTMARGIN, 240 + TOPMARGIN, 7 + BOTTOMMARGIN, 106 + END END #endif // APSTUDIO_INVOKED @@ -295,7 +303,7 @@ FONT 8, "MS Sans Serif" BEGIN ICON IDI_EMU48,IDC_STATIC,7,6,20,20,SS_REALSIZEIMAGE LTEXT "",IDC_VERSION,29,6,151,8,NOT WS_GROUP - LTEXT "Copyright © 2018 Christoph Gießelink && Sébastien Carlier", + LTEXT "Copyright © 2019 Christoph Gießelink && Sébastien Carlier", IDC_STATIC,29,18,181,8 DEFPUSHBUTTON "OK",IDOK,215,12,39,14 EDITTEXT IDC_LICENSE,7,33,247,112,ES_MULTILINE | ES_AUTOHSCROLL | @@ -366,7 +374,7 @@ BEGIN CONTROL "Slider1",IDC_SOUND_SLIDER,"msctls_trackbar32", TBS_AUTOTICKS | WS_TABSTOP,44,16,193,18 LTEXT "Device",IDC_STATIC,13,42,24,8 - COMBOBOX IDC_SOUND_DEVICE,44,40,193,87,CBS_DROPDOWNLIST | + COMBOBOX IDC_SOUND_DEVICE,44,40,193,87,CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP GROUPBOX "Sound",IDC_STATIC,7,7,237,54 LTEXT "IP Address:",IDC_STATIC,14,81,37,8 @@ -654,6 +662,30 @@ BEGIN PUSHBUTTON "Cancel",IDCANCEL,122,95,50,14 END +IDD_TRACE DIALOG DISCARDABLE 0, 0, 247, 113 +STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU +CAPTION "Trace Settings" +FONT 8, "MS Sans Serif" +BEGIN + LTEXT "Log File:",IDC_STATIC,7,13,28,8 + EDITTEXT IDC_TRACE_FILE,39,11,180,12,ES_AUTOHSCROLL + PUSHBUTTON "...",IDC_TRACE_BROWSE,220,11,20,12 + CONTROL "&New",IDC_TRACE_NEW,"Button",BS_AUTORADIOBUTTON | + WS_GROUP | WS_TABSTOP,16,49,41,10 + CONTROL "&Append",IDC_TRACE_APPEND,"Button",BS_AUTORADIOBUTTON, + 16,64,41,10 + GROUPBOX "File Mode",IDC_STATIC,7,32,113,53 + CONTROL "&Register",IDC_TRACE_REGISTER,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,45,43,10 + CONTROL "&MMU",IDC_TRACE_MMU,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,57,43,10 + CONTROL "&Opcode",IDC_TRACE_OPCODE,"Button",BS_AUTOCHECKBOX | + WS_TABSTOP,140,69,43,10 + GROUPBOX "Logging",IDC_STATIC,127,32,113,53 + DEFPUSHBUTTON "OK",IDOK,62,92,50,14 + PUSHBUTTON "Cancel",IDCANCEL,135,92,50,14 +END + ///////////////////////////////////////////////////////////////////////////// // @@ -720,8 +752,8 @@ END // VS_VERSION_INFO VERSIONINFO - FILEVERSION 1,6,1,0 - PRODUCTVERSION 1,6,1,0 + FILEVERSION 1,6,2,0 + PRODUCTVERSION 1,6,2,0 FILEFLAGSMASK 0x3fL #ifdef _DEBUG FILEFLAGS 0x1L @@ -738,12 +770,12 @@ BEGIN BEGIN VALUE "CompanyName", "Christoph Gießelink & Sebastien Carlier\0" VALUE "FileDescription", "HP38/39/40/48/49 Emulator\0" - VALUE "FileVersion", "1, 6, 1, 0\0" + VALUE "FileVersion", "1, 6, 2, 0\0" VALUE "InternalName", "Emu48\0" - VALUE "LegalCopyright", "Copyright © 2018\0" + VALUE "LegalCopyright", "Copyright © 2019\0" VALUE "OriginalFilename", "Emu48.exe\0" VALUE "ProductName", "Emu48\0" - VALUE "ProductVersion", "1, 6, 1, 0\0" + VALUE "ProductVersion", "1, 6, 2, 0\0" END END BLOCK "VarFileInfo" @@ -925,6 +957,11 @@ BEGIN BEGIN MENUITEM "&Step Over Interrupts", ID_INTR_STEPOVERINT END + POPUP "&Trace" + BEGIN + MENUITEM "&Settings...", ID_TRACE_SETTINGS + MENUITEM "&Enable", ID_TRACE_ENABLE + END POPUP "&Info" BEGIN MENUITEM "&Last Instructions...", ID_INFO_LASTINSTRUCTIONS diff --git a/Sources/GCCPatch/Makefile b/Sources/GCCPatch/Makefile index 2d87917..db883ba 100644 --- a/Sources/GCCPatch/Makefile +++ b/Sources/GCCPatch/Makefile @@ -13,6 +13,7 @@ DEFINES= -DIDC_STATIC=-1 \ LODEPNGDEFINES= -DLODEPNG_NO_COMPILE_ENCODER \ -DLODEPNG_NO_COMPILE_DISK \ + -DLODEPNG_NO_COMPILE_ANCILLARY_CHUNKS \ -DLODEPNG_NO_COMPILE_ERROR_TEXT \ -DLODEPNG_NO_COMPILE_CPP diff --git a/Sources/GCCPatch/README.TXT b/Sources/GCCPatch/README.TXT index f3cd8dd..e44f982 100644 --- a/Sources/GCCPatch/README.TXT +++ b/Sources/GCCPatch/README.TXT @@ -67,4 +67,4 @@ Many thanks to Pedro A. Arranda Guti compatible. -02/21/18 (c) by Christoph Gießelink +10/15/19 (c) by Christoph Gießelink diff --git a/beep.48 b/beep.48 index 50191d1..d85f9e1 100644 --- a/beep.48 +++ b/beep.48 @@ -1,2 +1 @@ ;01477:6300; disable 10 min auto off (internal, undocumented) -;017A6:81B1; =makebeep diff --git a/uninst.exe b/uninst.exe index 620c388c001d5d8142f0891fe57381aa5988eead..ebeed9359e1d25539d8abd36a05133c27158a50c 100755 GIT binary patch delta 66 zcmZ3~#j>c2Wy8EfoJJQB!gIl20XEs(wQh&zyE TJZjHqwAu0KU3-?aNzSPN*r^ug delta 66 zcmZ3~#j>c2Wy8EfoQw=?42%p642+wXA97`6G@ShQur-j>JQB!gF}eDPEs(wQh&zyE TJZjHqxY_aOU3(VEuZ#5o*d!Mo