mirror of
https://github.com/mamedev/mame.git
synced 2024-11-16 07:48:32 +01:00
436 lines
9.4 KiB
C++
436 lines
9.4 KiB
C++
// Windows/FileLink.cpp
|
|
|
|
#include "StdAfx.h"
|
|
|
|
#include "../../C/CpuArch.h"
|
|
|
|
#ifdef SUPPORT_DEVICE_FILE
|
|
#include "../../C/Alloc.h"
|
|
#endif
|
|
|
|
#include "FileDir.h"
|
|
#include "FileFind.h"
|
|
#include "FileIO.h"
|
|
#include "FileName.h"
|
|
|
|
#ifndef _UNICODE
|
|
extern bool g_IsNT;
|
|
#endif
|
|
|
|
namespace NWindows {
|
|
namespace NFile {
|
|
|
|
using namespace NName;
|
|
|
|
/*
|
|
Reparse Points (Junctions and Symbolic Links):
|
|
struct
|
|
{
|
|
UInt32 Tag;
|
|
UInt16 Size; // not including starting 8 bytes
|
|
UInt16 Reserved; // = 0
|
|
|
|
UInt16 SubstituteOffset; // offset in bytes from start of namesChars
|
|
UInt16 SubstituteLen; // size in bytes, it doesn't include tailed NUL
|
|
UInt16 PrintOffset; // offset in bytes from start of namesChars
|
|
UInt16 PrintLen; // size in bytes, it doesn't include tailed NUL
|
|
|
|
[UInt32] Flags; // for Symbolic Links only.
|
|
|
|
UInt16 namesChars[]
|
|
}
|
|
|
|
MOUNT_POINT (Junction point):
|
|
1) there is NUL wchar after path
|
|
2) Default Order in table:
|
|
Substitute Path
|
|
Print Path
|
|
3) pathnames can not contain dot directory names
|
|
|
|
SYMLINK:
|
|
1) there is no NUL wchar after path
|
|
2) Default Order in table:
|
|
Print Path
|
|
Substitute Path
|
|
*/
|
|
|
|
/*
|
|
static const UInt32 kReparseFlags_Alias = (1 << 29);
|
|
static const UInt32 kReparseFlags_HighLatency = (1 << 30);
|
|
static const UInt32 kReparseFlags_Microsoft = ((UInt32)1 << 31);
|
|
|
|
#define _my_IO_REPARSE_TAG_HSM (0xC0000004L)
|
|
#define _my_IO_REPARSE_TAG_HSM2 (0x80000006L)
|
|
#define _my_IO_REPARSE_TAG_SIS (0x80000007L)
|
|
#define _my_IO_REPARSE_TAG_WIM (0x80000008L)
|
|
#define _my_IO_REPARSE_TAG_CSV (0x80000009L)
|
|
#define _my_IO_REPARSE_TAG_DFS (0x8000000AL)
|
|
#define _my_IO_REPARSE_TAG_DFSR (0x80000012L)
|
|
*/
|
|
|
|
#define Get16(p) GetUi16(p)
|
|
#define Get32(p) GetUi32(p)
|
|
|
|
#define Set16(p, v) SetUi16(p, v)
|
|
#define Set32(p, v) SetUi32(p, v)
|
|
|
|
static const wchar_t *k_LinkPrefix = L"\\??\\";
|
|
static const unsigned k_LinkPrefix_Size = 4;
|
|
|
|
static const bool IsLinkPrefix(const wchar_t *s)
|
|
{
|
|
return IsString1PrefixedByString2(s, k_LinkPrefix);
|
|
}
|
|
|
|
/*
|
|
static const wchar_t *k_VolumePrefix = L"Volume{";
|
|
static const bool IsVolumeName(const wchar_t *s)
|
|
{
|
|
return IsString1PrefixedByString2(s, k_VolumePrefix);
|
|
}
|
|
*/
|
|
|
|
void WriteString(Byte *dest, const wchar_t *path)
|
|
{
|
|
for (;;)
|
|
{
|
|
wchar_t c = *path++;
|
|
if (c == 0)
|
|
return;
|
|
Set16(dest, (UInt16)c);
|
|
dest += 2;
|
|
}
|
|
}
|
|
|
|
#if defined(_WIN32) && !defined(UNDER_CE)
|
|
|
|
bool FillLinkData(CByteBuffer &dest, const wchar_t *path, bool isSymLink)
|
|
{
|
|
bool isAbs = IsAbsolutePath(path);
|
|
if (!isAbs && !isSymLink)
|
|
return false;
|
|
|
|
bool needPrintName = true;
|
|
|
|
if (IsSuperPath(path))
|
|
{
|
|
path += kSuperPathPrefixSize;
|
|
if (!IsDrivePath(path))
|
|
needPrintName = false;
|
|
}
|
|
|
|
const unsigned add_Prefix_Len = isAbs ? k_LinkPrefix_Size : 0;
|
|
|
|
unsigned len2 = MyStringLen(path) * 2;
|
|
const unsigned len1 = len2 + add_Prefix_Len * 2;
|
|
if (!needPrintName)
|
|
len2 = 0;
|
|
|
|
unsigned totalNamesSize = (len1 + len2);
|
|
|
|
/* some WIM imagex software uses old scheme for symbolic links.
|
|
so we can old scheme for byte to byte compatibility */
|
|
|
|
bool newOrderScheme = isSymLink;
|
|
// newOrderScheme = false;
|
|
|
|
if (!newOrderScheme)
|
|
totalNamesSize += 2 * 2;
|
|
|
|
const size_t size = 8 + 8 + (isSymLink ? 4 : 0) + totalNamesSize;
|
|
dest.Alloc(size);
|
|
memset(dest, 0, size);
|
|
const UInt32 tag = isSymLink ?
|
|
_my_IO_REPARSE_TAG_SYMLINK :
|
|
_my_IO_REPARSE_TAG_MOUNT_POINT;
|
|
Byte *p = dest;
|
|
Set32(p, tag);
|
|
Set16(p + 4, (UInt16)(size - 8));
|
|
Set16(p + 6, 0);
|
|
p += 8;
|
|
|
|
unsigned subOffs = 0;
|
|
unsigned printOffs = 0;
|
|
if (newOrderScheme)
|
|
subOffs = len2;
|
|
else
|
|
printOffs = len1 + 2;
|
|
|
|
Set16(p + 0, (UInt16)subOffs);
|
|
Set16(p + 2, (UInt16)len1);
|
|
Set16(p + 4, (UInt16)printOffs);
|
|
Set16(p + 6, (UInt16)len2);
|
|
|
|
p += 8;
|
|
if (isSymLink)
|
|
{
|
|
UInt32 flags = isAbs ? 0 : _my_SYMLINK_FLAG_RELATIVE;
|
|
Set32(p, flags);
|
|
p += 4;
|
|
}
|
|
|
|
if (add_Prefix_Len != 0)
|
|
WriteString(p + subOffs, k_LinkPrefix);
|
|
WriteString(p + subOffs + add_Prefix_Len * 2, path);
|
|
if (needPrintName)
|
|
WriteString(p + printOffs, path);
|
|
return true;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void GetString(const Byte *p, unsigned len, UString &res)
|
|
{
|
|
wchar_t *s = res.GetBuf(len);
|
|
unsigned i;
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
wchar_t c = Get16(p + i * 2);
|
|
if (c == 0)
|
|
break;
|
|
s[i] = c;
|
|
}
|
|
s[i] = 0;
|
|
res.ReleaseBuf_SetLen(i);
|
|
}
|
|
|
|
bool CReparseAttr::Parse(const Byte *p, size_t size)
|
|
{
|
|
if (size < 8)
|
|
return false;
|
|
Tag = Get32(p);
|
|
UInt32 len = Get16(p + 4);
|
|
if (len + 8 > size)
|
|
return false;
|
|
/*
|
|
if ((type & kReparseFlags_Alias) == 0 ||
|
|
(type & kReparseFlags_Microsoft) == 0 ||
|
|
(type & 0xFFFF) != 3)
|
|
*/
|
|
if (Tag != _my_IO_REPARSE_TAG_MOUNT_POINT &&
|
|
Tag != _my_IO_REPARSE_TAG_SYMLINK)
|
|
// return true;
|
|
return false;
|
|
|
|
if (Get16(p + 6) != 0) // padding
|
|
return false;
|
|
|
|
p += 8;
|
|
size -= 8;
|
|
|
|
if (len != size) // do we need that check?
|
|
return false;
|
|
|
|
if (len < 8)
|
|
return false;
|
|
unsigned subOffs = Get16(p);
|
|
unsigned subLen = Get16(p + 2);
|
|
unsigned printOffs = Get16(p + 4);
|
|
unsigned printLen = Get16(p + 6);
|
|
len -= 8;
|
|
p += 8;
|
|
|
|
Flags = 0;
|
|
if (Tag == _my_IO_REPARSE_TAG_SYMLINK)
|
|
{
|
|
if (len < 4)
|
|
return false;
|
|
Flags = Get32(p);
|
|
len -= 4;
|
|
p += 4;
|
|
}
|
|
|
|
if ((subOffs & 1) != 0 || subOffs > len || len - subOffs < subLen)
|
|
return false;
|
|
if ((printOffs & 1) != 0 || printOffs > len || len - printOffs < printLen)
|
|
return false;
|
|
GetString(p + subOffs, subLen >> 1, SubsName);
|
|
GetString(p + printOffs, printLen >> 1, PrintName);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CReparseShortInfo::Parse(const Byte *p, size_t size)
|
|
{
|
|
const Byte *start = p;
|
|
Offset= 0;
|
|
Size = 0;
|
|
if (size < 8)
|
|
return false;
|
|
UInt32 Tag = Get32(p);
|
|
UInt32 len = Get16(p + 4);
|
|
if (len + 8 > size)
|
|
return false;
|
|
/*
|
|
if ((type & kReparseFlags_Alias) == 0 ||
|
|
(type & kReparseFlags_Microsoft) == 0 ||
|
|
(type & 0xFFFF) != 3)
|
|
*/
|
|
if (Tag != _my_IO_REPARSE_TAG_MOUNT_POINT &&
|
|
Tag != _my_IO_REPARSE_TAG_SYMLINK)
|
|
// return true;
|
|
return false;
|
|
|
|
if (Get16(p + 6) != 0) // padding
|
|
return false;
|
|
|
|
p += 8;
|
|
size -= 8;
|
|
|
|
if (len != size) // do we need that check?
|
|
return false;
|
|
|
|
if (len < 8)
|
|
return false;
|
|
unsigned subOffs = Get16(p);
|
|
unsigned subLen = Get16(p + 2);
|
|
unsigned printOffs = Get16(p + 4);
|
|
unsigned printLen = Get16(p + 6);
|
|
len -= 8;
|
|
p += 8;
|
|
|
|
// UInt32 Flags = 0;
|
|
if (Tag == _my_IO_REPARSE_TAG_SYMLINK)
|
|
{
|
|
if (len < 4)
|
|
return false;
|
|
// Flags = Get32(p);
|
|
len -= 4;
|
|
p += 4;
|
|
}
|
|
|
|
if ((subOffs & 1) != 0 || subOffs > len || len - subOffs < subLen)
|
|
return false;
|
|
if ((printOffs & 1) != 0 || printOffs > len || len - printOffs < printLen)
|
|
return false;
|
|
|
|
Offset = (unsigned)(p - start) + subOffs;
|
|
Size = subLen;
|
|
return true;
|
|
}
|
|
|
|
bool CReparseAttr::IsOkNamePair() const
|
|
{
|
|
if (IsLinkPrefix(SubsName))
|
|
{
|
|
if (!IsDrivePath(SubsName.Ptr(k_LinkPrefix_Size)))
|
|
return PrintName.IsEmpty();
|
|
if (wcscmp(SubsName.Ptr(k_LinkPrefix_Size), PrintName) == 0)
|
|
return true;
|
|
}
|
|
return wcscmp(SubsName, PrintName) == 0;
|
|
}
|
|
|
|
/*
|
|
bool CReparseAttr::IsVolume() const
|
|
{
|
|
if (!IsLinkPrefix(SubsName))
|
|
return false;
|
|
return IsVolumeName(SubsName.Ptr(k_LinkPrefix_Size));
|
|
}
|
|
*/
|
|
|
|
UString CReparseAttr::GetPath() const
|
|
{
|
|
UString s = SubsName;
|
|
if (IsLinkPrefix(s))
|
|
{
|
|
s.ReplaceOneCharAtPos(1, '\\');
|
|
if (IsDrivePath(s.Ptr(k_LinkPrefix_Size)))
|
|
s.DeleteFrontal(k_LinkPrefix_Size);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
#ifdef SUPPORT_DEVICE_FILE
|
|
|
|
namespace NSystem
|
|
{
|
|
bool MyGetDiskFreeSpace(CFSTR rootPath, UInt64 &clusterSize, UInt64 &totalSize, UInt64 &freeSize);
|
|
}
|
|
#endif
|
|
|
|
#ifndef UNDER_CE
|
|
|
|
namespace NIO {
|
|
|
|
bool GetReparseData(CFSTR path, CByteBuffer &reparseData, BY_HANDLE_FILE_INFORMATION *fileInfo)
|
|
{
|
|
reparseData.Free();
|
|
CInFile file;
|
|
if (!file.OpenReparse(path))
|
|
return false;
|
|
|
|
if (fileInfo)
|
|
file.GetFileInformation(fileInfo);
|
|
|
|
const unsigned kBufSize = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
|
|
CByteArr buf(kBufSize);
|
|
DWORD returnedSize;
|
|
if (!file.DeviceIoControlOut(my_FSCTL_GET_REPARSE_POINT, buf, kBufSize, &returnedSize))
|
|
return false;
|
|
reparseData.CopyFrom(buf, returnedSize);
|
|
return true;
|
|
}
|
|
|
|
static bool CreatePrefixDirOfFile(CFSTR path)
|
|
{
|
|
FString path2 = path;
|
|
int pos = path2.ReverseFind_PathSepar();
|
|
if (pos < 0)
|
|
return true;
|
|
#ifdef _WIN32
|
|
if (pos == 2 && path2[1] == L':')
|
|
return true; // we don't create Disk folder;
|
|
#endif
|
|
path2.DeleteFrom(pos);
|
|
return NDir::CreateComplexDir(path2);
|
|
}
|
|
|
|
// If there is Reprase data already, it still writes new Reparse data
|
|
bool SetReparseData(CFSTR path, bool isDir, const void *data, DWORD size)
|
|
{
|
|
NFile::NFind::CFileInfo fi;
|
|
if (fi.Find(path))
|
|
{
|
|
if (fi.IsDir() != isDir)
|
|
{
|
|
::SetLastError(ERROR_DIRECTORY);
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (isDir)
|
|
{
|
|
if (!NDir::CreateComplexDir(path))
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
CreatePrefixDirOfFile(path);
|
|
COutFile file;
|
|
if (!file.Create(path, CREATE_NEW))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
COutFile file;
|
|
if (!file.Open(path,
|
|
FILE_SHARE_WRITE,
|
|
OPEN_EXISTING,
|
|
FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS))
|
|
return false;
|
|
|
|
DWORD returnedSize;
|
|
if (!file.DeviceIoControl(my_FSCTL_SET_REPARSE_POINT, (void *)data, size, NULL, 0, &returnedSize))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}}
|