mirror of
https://github.com/jezhiggins/arabica
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252 lines
7.5 KiB
C++
252 lines
7.5 KiB
C++
#ifndef BASIC_CONVERTSTREAM_H
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#define BASIC_CONVERTSTREAM_H
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//////////////////////////////////////////////////////
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//
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// $Id$
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//
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//////////////////////////////////////////////////////
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//
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// basic_iconvertstream, basic_oconvertstream
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//
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// Written by Jez Higgins <jez@jezuk.co.uk>
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// Copyright 1999-2003 Jez UK Ltd, http://www.jezuk.co.uk/
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//
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// Normal basic_stringstream do not apply the codecvt facet
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// of their locale. These two streams act exactly like
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// basic_stringstream except that they do apply the imbued codecvt
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// facet to their input (in the case of basic_iconvertstream)
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// or output (int the case of basic_oconvertstream).
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//
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// This means you can to cool things like this
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//
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// std::locale loc(std::_Addfac(std::locale(), new base64_codecvt));
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// converting_ostringstream os;
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// os.imbue(loc);
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//
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// os << "stuff";
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// ... lots more stuff streamed into os
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//
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// std::cout << os.str() << std::endl;
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// os.str() contains the Base64 encoded byte sequence
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//
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// Decoding is just as simple.
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//
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// std::locale loc(std::_Addfac(std::locale(), new base64_codecvt));
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//
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// converting_istringstream is;
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// is.imbue(loc);
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// is.str(a_base64_byte_stream);
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// std::cout << is.str();
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// ... is.str() is the decode byte stream, which can also be extracted
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// ... using >> operators (is >> byte; etc)
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//
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////////////////////////////////////////////////////////////
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#include <locale>
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#include <sstream>
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#include <algorithm>
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template<typename charT,
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typename traitsT = std::char_traits<charT>,
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typename fromCharT = charT,
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typename fromTraitsT = std::char_traits<fromCharT> >
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class basic_iconvertstream : public std::basic_istream<charT, traitsT>
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{
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public:
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typedef std::basic_istream<charT, traitsT> istreamT;
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typedef std::basic_stringbuf<charT, traitsT> stringbufT;
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typedef std::basic_string<charT, traitsT> stringT;
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typedef std::basic_string<fromCharT, fromTraitsT> fromStringT;
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explicit basic_iconvertstream(ios_base::openmode mode = in) :
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std::basic_istream<charT, traitsT>( 0 ),
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stringbuf_(mode | in)
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{ istreamT::init( &stringbuf_ ); }
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explicit basic_iconvertstream(const stringT& str, ios_base::openmode mode = in)
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: std::basic_istream<charT, traitsT>(0), stringbuf_(mode | in)
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{
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istreamT::init( &stringbuf_ ); // istreamT::rdbuf(&stringbuf_);
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str(str);
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}
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virtual ~basic_iconvertstream()
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{}
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stringbufT* rdbuf() const
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{
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return static_cast<stringbufT *>(&stringbuf_);
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} // rdbuf
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stringT str() const
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{
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return stringbuf_.str();
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} // str
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void str(const fromStringT& str)
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{
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// do conversion
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#if !(defined _MSC_VER) || !(_MSC_VER < 1300)
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const std::codecvt<charT, fromCharT, typename traitsT::state_type>& cvt =
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std::use_facet<std::codecvt<charT, fromCharT, typename traitsT::state_type> >(this->getloc());
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#else
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const std::codecvt<charT, fromCharT, traitsT::state_type>& cvt =
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std::use_facet(stringbuf_.getloc(), (std::codecvt<charT, fromCharT, traitsT::state_type>*)0, true);
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#endif
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if(cvt.always_noconv())
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{
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stringbuf_.str(no_conversion(str));
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return;
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}
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// we must do code conversion
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stringT converted;
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size_t toBufLen = str.length() + 4; // 4 is arbitrary bit of bonus space
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charT* to = new charT[toBufLen]; // 4 is arbitrary
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const fromCharT* from_next = str.data();
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typename std::codecvt_base::result r;
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typename traitsT::state_type state;
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do
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{
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charT* to_next;
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r = cvt.in(state, from_next, str.data() + str.length(), from_next,
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to, to + toBufLen, to_next);
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if(r == std::codecvt_base::noconv)
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{
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converted.append(no_conversion(str));
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break;
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}
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converted.append(to, (to_next - to));
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}
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while(r == std::codecvt_base::partial);
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delete[] to;
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// naughty! ignore (r == std::codecvt_base::error)
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stringbuf_.str(converted);
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} // str
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private:
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stringT no_conversion(const fromStringT& str)
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{
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stringT dest;
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#if !(defined _MSC_VER) || !(_MSC_VER < 1300)
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std::copy(str.begin(), str.end(), std::back_inserter(dest));
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#else
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// hack around pre-Standard library
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for(typename fromStringT::const_iterator i = str.begin(); i != str.end(); ++i)
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dest += static_cast<charT>(*i);
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#endif
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return dest;
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} // no_conversion
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stringbufT stringbuf_;
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}; // basic_iconvertstream
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template<typename charT,
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typename traitsT = std::char_traits<charT>,
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typename toCharT = charT,
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typename toTraitsT = std::char_traits<toCharT> >
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class basic_oconvertstream : public std::basic_ostream<charT, traitsT>
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{
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public:
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typedef std::basic_ostream<charT, traitsT> ostreamT;
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typedef std::basic_stringbuf<charT, traitsT> stringbufT;
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typedef std::basic_string<charT, traitsT> stringT;
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typedef std::basic_string<toCharT, toTraitsT> toStringT;
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explicit basic_oconvertstream(ios_base::openmode mode = out) :
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std::basic_ostream<charT, traitsT>( 0 ),
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stringbuf_(mode | out)
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{ ostreamT::init( &stringbuf_ ); }
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explicit basic_oconvertstream(const stringT& str, ios_base::openmode mode = out) :
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std::basic_ostream<charT, traitsT>( 0 ),
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stringbuf_(str, mode | out)
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{ std::basic_ios<charT,traitsT>::init( &stringbuf_ ); }
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virtual ~basic_oconvertstream()
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{}
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stringbufT* rdbuf() const
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{
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return static_cast<stringbufT *>(&stringbuf_);
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} // rdbuf
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toStringT str()
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{
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toStringT out;
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stringT newstuff(stringbuf_.str());
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if(newstuff.length() == 0)
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return out;
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// convert it here
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#if !(defined _MSC_VER) || !(_MSC_VER < 1300)
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const std::codecvt<charT, toCharT, typename traitsT::state_type>& cvt =
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std::use_facet<std::codecvt<charT, toCharT, typename traitsT::state_type> >(this->getloc());
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#else
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const std::codecvt<charT, toCharT, traitsT::state_type>& cvt =
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std::use_facet(stringbuf_.getloc(), (std::codecvt<charT, toCharT, traitsT::state_type>*)0, true);
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#endif
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if(cvt.always_noconv())
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out.append(no_conversion(newstuff));
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else
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{
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// we must do code conversion
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size_t toBufLen = newstuff.length() + 4; // 4 is arbitrary little bit of extra space
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toCharT* to = new toCharT[toBufLen];
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const charT* from_next = newstuff.data();
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typename std::codecvt_base::result r;
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typename traitsT::state_type state;
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do
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{
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toCharT* to_next;
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r = cvt.out(state, from_next, newstuff.data() + newstuff.length(), from_next,
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to, to + toBufLen, to_next);
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if(r == std::codecvt_base::noconv)
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{
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out.append(no_conversion(newstuff));
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break;
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}
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out.append(to, (to_next - to));
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}
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while(r == std::codecvt_base::partial);
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delete[] to;
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// naughty! ignore (r == std::codecvt_base::error)
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} // if(cvt.always_noconv())
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stringbuf_.str(stringT());
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return out;
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} // str
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void str(const stringT& str)
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{
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stringbuf_.str(str);
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} // str
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private:
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toStringT no_conversion(const stringT& str)
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{
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toStringT dest;
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#if !(defined _MSC_VER) || !(_MSC_VER < 1300)
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std::copy(str.begin(), str.end(), std::back_inserter(dest));
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#else
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for(typename stringT::const_iterator i = str.begin(); i != str.end(); ++i)
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dest += static_cast<toCharT>(*i);
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#endif
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return dest;
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} // no_conversion
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stringbufT stringbuf_;
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}; // basic_oconvertstream
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typedef basic_iconvertstream<char> converting_istringstream;
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typedef basic_iconvertstream<wchar_t> converting_iwstringstream;
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typedef basic_oconvertstream<char> converting_ostringstream;
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typedef basic_oconvertstream<wchar_t> converting_owstringstream;
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#endif
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