mirror of
https://github.com/xiaoyifang/goldendict-ng.git
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140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#include "iconv.hh"
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#include <vector>
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#include <errno.h>
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#include <string.h>
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#include "wstring_qt.hh"
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char const * const Iconv::GdWchar = "UTF-32LE";
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char const * const Iconv::Utf16Le = "UTF-16LE";
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char const * const Iconv::Utf8 = "UTF-8";
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using gd::wchar;
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Iconv::Iconv( char const * to, char const * from )
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#ifdef USE_ICONV
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// the to encoding must be UTF8
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:state( iconv_open( Utf8, from ) )
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#endif
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{
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#ifdef USE_ICONV
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if( state == (iconv_t) -1 )
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throw exCantInit( strerror( errno ) );
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#else
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codec = QTextCodec::codecForName( from );
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#endif
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}
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Iconv::~Iconv()
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{
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#ifdef USE_ICONV
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iconv_close( state );
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#endif
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}
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QString Iconv::convert(void const* & inBuf, size_t& inBytesLeft)
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{
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#ifdef USE_ICONV
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size_t dsz = inBytesLeft;
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//avoid most realloc
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std::vector< char > outBuf( dsz + 32 );
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void * outBufPtr = &outBuf.front();
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size_t outBufLeft = outBuf.size();
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size_t result;
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while( inBytesLeft > 0 )
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{
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result = iconv( state, (char **) &inBuf, &inBytesLeft, (char **) &outBufPtr, &outBufLeft );
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if( result == (size_t) -1 )
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{
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if( errno == E2BIG || outBufLeft == 0 )
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{
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if( inBytesLeft > 0 )
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{
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// Grow the buffer and retry
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// The pointer may get invalidated so we save the diff and restore it
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size_t offset = (char *) outBufPtr - &outBuf.front();
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outBuf.resize( outBuf.size() + dsz );
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outBufPtr = &outBuf.front() + offset;
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outBufLeft += dsz;
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continue;
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}
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}
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break;
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}
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}
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//flush output
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if( result != (size_t) ( -1 ) )
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{
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/* flush the shift-out sequences */
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for( ;; )
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{
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result = iconv( state, NULL, NULL, (char **) &outBufPtr, &outBufLeft );
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if( result != (size_t) ( -1 ) )
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{
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break;
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}
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if( errno == E2BIG )
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{
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size_t offset = (char *) outBufPtr - &outBuf.front();
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outBuf.resize( outBuf.size() + 256 );
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outBufPtr = &outBuf.front() + offset;
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outBufLeft += 256;
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}
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else
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{
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break;
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}
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}
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}
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size_t datasize = outBuf.size() - outBufLeft;
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// QByteArray ba( &outBuf.front(), datasize );
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return QString::fromUtf8( &outBuf.front(), datasize );
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#else
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if( codec )
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return codec->toUnicode( static_cast< const char * >( inBuf ), inBytesLeft );
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QByteArray ba( static_cast< const char * >( inBuf ), inBytesLeft );
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return QString( ba );
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#endif
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}
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gd::wstring Iconv::toWstring( char const * fromEncoding, void const * fromData,
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size_t dataSize )
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{
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/// Special-case the dataSize == 0 to avoid any kind of iconv-specific
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/// behaviour in that regard.
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if ( !dataSize )
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return gd::wstring();
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Iconv ic( Utf8, fromEncoding );
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QString outStr = ic.convert(fromData, dataSize);
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return gd::toWString(outStr);
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}
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std::string Iconv::toUtf8( char const * fromEncoding, void const * fromData,
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size_t dataSize )
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{
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// Similar to toWstring
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if ( !dataSize )
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return std::string();
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Iconv ic( Utf8, fromEncoding );
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QString outStr = ic.convert(fromData, dataSize);
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return gd::toStdString(outStr);
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}
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