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tqt3/src/codecs/qutfcodec.cpp

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/****************************************************************************
**
** Implementation of TQUtf{8,16}Codec class
**
** Created : 981015
**
** Copyright (C) 1998-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the tools module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "ntqutfcodec.h"
#ifndef QT_NO_TEXTCODEC
int TQUtf8Codec::mibEnum() const
{
return 106;
}
TQCString TQUtf8Codec::fromUnicode(const TQString& uc, int& lenInOut) const
{
int l = uc.length();
if (lenInOut > 0)
l = TQMIN(l, lenInOut);
int rlen = l*3+1;
TQCString rstr(rlen);
uchar* cursor = (uchar*)rstr.data();
const TQChar *ch = uc.unicode();
for (int i=0; i < l; i++) {
uint u = ch->unicode();
if ( u < 0x80 ) {
*cursor++ = (uchar)u;
} else {
if ( u < 0x0800 ) {
*cursor++ = 0xc0 | ((uchar) (u >> 6));
} else {
if (u >= 0xd800 && u < 0xdc00 && i < l-1) {
unsigned short low = ch[1].unicode();
if (low >= 0xdc00 && low < 0xe000) {
++ch;
++i;
u = (u - 0xd800)*0x400 + (low - 0xdc00) + 0x10000;
}
}
if (u > 0xffff) {
// see TQString::fromUtf8() and TQString::utf8() for explanations
if (u > 0x10fe00 && u < 0x10ff00) {
*cursor++ = (u - 0x10fe00);
++ch;
continue;
} else {
*cursor++ = 0xf0 | ((uchar) (u >> 18));
*cursor++ = 0x80 | ( ((uchar) (u >> 12)) & 0x3f);
}
} else {
*cursor++ = 0xe0 | ((uchar) (u >> 12));
}
*cursor++ = 0x80 | ( ((uchar) (u >> 6)) & 0x3f);
}
*cursor++ = 0x80 | ((uchar) (u&0x3f));
}
++ch;
}
*cursor = 0;
lenInOut = cursor - (uchar*)rstr.data();
((TQByteArray&)rstr).resize(lenInOut+1);
return rstr;
}
TQString TQUtf8Codec::toUnicode(const char* chars, int len) const
{
if (len > 3 && (uchar)chars[0] == 0xef && (uchar)chars[1] == 0xbb && (uchar)chars[2] == 0xbf) {
// starts with a byte order mark
chars += 3;
len -= 3;
}
return TQString::fromUtf8( chars, len );
}
const char* TQUtf8Codec::name() const
{
return "UTF-8";
}
int TQUtf8Codec::heuristicContentMatch(const char* chars, int len) const
{
int score = 0;
for (int i=0; i<len; i++) {
uchar ch = chars[i];
// No nulls allowed.
if ( !ch )
return -1;
if ( ch < 128 ) {
// Inconclusive
score++;
} else if ( (ch&0xe0) == 0xc0 ) {
if ( i < len-1 ) {
uchar c2 = chars[++i];
if ( (c2&0xc0) != 0x80 )
return -1;
score+=3;
}
} else if ( (ch&0xf0) == 0xe0 ) {
if ( i < len-1 ) {
uchar c2 = chars[++i];
if ( (c2&0xc0) != 0x80 ) {
return -1;
#if 0
if ( i < len-1 ) {
uchar c3 = chars[++i];
if ( (c3&0xc0) != 0x80 )
return -1;
score+=3;
}
#endif
}
score+=2;
}
}
}
return score;
}
class TQUtf8Decoder : public TQTextDecoder {
uint uc;
uint min_uc;
int need;
bool headerDone;
public:
TQUtf8Decoder() : need(0), headerDone(FALSE)
{
}
TQString toUnicode(const char* chars, int len)
{
TQString result;
result.setLength( len + 1 ); // worst case
TQChar *qch = (TQChar *)result.unicode();
uchar ch;
int error = -1;
for (int i=0; i<len; i++) {
ch = chars[i];
if (need) {
if ( (ch&0xc0) == 0x80 ) {
uc = (uc << 6) | (ch & 0x3f);
need--;
if ( !need ) {
if (uc > 0xffff) {
// surrogate pair
uc -= 0x10000;
unsigned short high = uc/0x400 + 0xd800;
unsigned short low = uc%0x400 + 0xdc00;
*qch++ = TQChar(high);
*qch++ = TQChar(low);
headerDone = TRUE;
} else if ((uc < min_uc) || (uc >= 0xd800 && uc <= 0xdfff) || (uc >= 0xfffe)) {
*qch++ = TQChar::replacement;
} else {
if (headerDone || TQChar(uc) != TQChar::byteOrderMark)
*qch++ = uc;
headerDone = TRUE;
}
}
} else {
// error
i = error;
*qch++ = TQChar::replacement;
need = 0;
}
} else {
if ( ch < 128 ) {
*qch++ = ch;
headerDone = TRUE;
} else if ((ch & 0xe0) == 0xc0) {
uc = ch & 0x1f;
need = 1;
error = i;
min_uc = 0x80;
} else if ((ch & 0xf0) == 0xe0) {
uc = ch & 0x0f;
need = 2;
error = i;
min_uc = 0x800;
} else if ((ch&0xf8) == 0xf0) {
uc = ch & 0x07;
need = 3;
error = i;
min_uc = 0x10000;
} else {
// error
*qch++ = TQChar::replacement;
}
}
}
result.truncate( qch - result.unicode() );
return result;
}
};
TQTextDecoder* TQUtf8Codec::makeDecoder() const
{
return new TQUtf8Decoder;
}
int TQUtf16Codec::mibEnum() const
{
return 1000;
}
const char* TQUtf16Codec::name() const
{
return "ISO-10646-UCS-2";
}
int TQUtf16Codec::heuristicContentMatch(const char* chars, int len) const
{
uchar* uchars = (uchar*)chars;
if ( len >= 2 && ((uchars[0] == 0xff && uchars[1] == 0xfe) ||
(uchars[1] == 0xff && uchars[0] == 0xfe)) )
return len;
else
return 0;
}
class TQUtf16Encoder : public TQTextEncoder {
bool headerdone;
public:
TQUtf16Encoder() : headerdone(FALSE)
{
}
TQCString fromUnicode(const TQString& uc, int& lenInOut)
{
if ( headerdone ) {
lenInOut = uc.length()*sizeof(TQChar);
TQCString d(lenInOut);
memcpy(d.data(),uc.unicode(),lenInOut);
return d;
} else {
headerdone = TRUE;
lenInOut = (1+uc.length())*sizeof(TQChar);
TQCString d(lenInOut);
memcpy(d.data(),&TQChar::byteOrderMark,sizeof(TQChar));
memcpy(d.data()+sizeof(TQChar),uc.unicode(),uc.length()*sizeof(TQChar));
return d;
}
}
};
class TQUtf16Decoder : public TQTextDecoder {
uchar buf;
bool half;
bool swap;
bool headerdone;
public:
TQUtf16Decoder() : half(FALSE), swap(FALSE), headerdone(FALSE)
{
}
TQString toUnicode(const char* chars, int len)
{
TQString result;
result.setLength( len + 1 ); // worst case
TQChar *qch = (TQChar *)result.unicode();
TQChar ch;
while ( len-- ) {
if ( half ) {
if ( swap ) {
ch.setRow( *chars++ );
ch.setCell( buf );
} else {
ch.setRow( buf );
ch.setCell( *chars++ );
}
if ( !headerdone ) {
if ( ch == TQChar::byteOrderSwapped ) {
swap = !swap;
} else if ( ch == TQChar::byteOrderMark ) {
// Ignore ZWNBSP
} else {
*qch++ = ch;
}
headerdone = TRUE;
} else
*qch++ = ch;
half = FALSE;
} else {
buf = *chars++;
half = TRUE;
}
}
result.truncate( qch - result.unicode() );
return result;
}
};
TQTextDecoder* TQUtf16Codec::makeDecoder() const
{
return new TQUtf16Decoder;
}
TQTextEncoder* TQUtf16Codec::makeEncoder() const
{
return new TQUtf16Encoder;
}
#endif //QT_NO_TEXTCODEC