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gecko-dev/intl/uconv/ucvcn/nsUnicodeToGBK.cpp
gerv%gerv.net 31625ba2b1 Bug 236613: change to MPL/LGPL/GPL tri-license.
2004-04-18 14:21:17 +00:00

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* A character set converter from Unicode to GBK.
*
*
* @created 08/Sept/1999
* @author Yueheng Xu, Yueheng.Xu@intel.com
* Revision History
* 04/Oct/1999. Yueheng Xu: used table gUnicodeToGBKTable[0x5200] to make
* Unicode to GB mapping fast
*/
#include "nsUnicodeToGBK.h"
#include "nsICharRepresentable.h"
#include "nsUCvCnDll.h"
#include "gbku.h"
#include "uconvutil.h"
#include "nsUnicharUtils.h"
//-------------------------------------------------------------
// Global table initialization function defined in gbku.h
//-------------------------------------------------------------
static const PRInt16 g_2BytesShiftTable[] = {
0, u2BytesCharset,
ShiftCell(0,0,0,0,0,0,0,0)
};
static const PRInt16 g_4BytesGB18030ShiftTable[] = {
0, u4BytesGB18030Charset,
ShiftCell(0,0,0,0,0,0,0,0)
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGB18030 and nsUnicodeToGB18030Font0
// nsUnicodeToGB18030Uniq2Bytes
//-----------------------------------------------------------------------
static const PRUint16 g_uf_gb18030_2bytes[] = {
#include "gb18030uniq2b.uf"
};
class nsUnicodeToGB18030Uniq2Bytes : public nsTableEncoderSupport
{
public:
nsUnicodeToGB18030Uniq2Bytes()
: nsTableEncoderSupport((uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gb18030_2bytes, 2) {};
protected:
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGB18030
// nsUnicodeTo4BytesGB18030
//-----------------------------------------------------------------------
static const PRUint16 g_uf_gb18030_4bytes[] = {
#include "gb180304bytes.uf"
};
class nsUnicodeTo4BytesGB18030 : public nsTableEncoderSupport
{
public:
nsUnicodeTo4BytesGB18030()
: nsTableEncoderSupport( (uShiftTable*) &g_4BytesGB18030ShiftTable,
(uMappingTable*) &g_uf_gb18030_4bytes, 4) {};
protected:
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGBK
// nsUnicodeToGBKUniq2Bytes
//-----------------------------------------------------------------------
static const PRUint16 g_uf_gbk_2bytes[] = {
#include "gbkuniq2b.uf"
};
class nsUnicodeToGBKUniq2Bytes : public nsTableEncoderSupport
{
public:
nsUnicodeToGBKUniq2Bytes()
: nsTableEncoderSupport( (uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gbk_2bytes, 2) {};
protected:
};
//-----------------------------------------------------------------------
// nsUnicodeToGB18030
//-----------------------------------------------------------------------
void nsUnicodeToGB18030::CreateExtensionEncoder()
{
mExtensionEncoder = new nsUnicodeToGB18030Uniq2Bytes();
}
void nsUnicodeToGB18030::Create4BytesEncoder()
{
m4BytesEncoder = new nsUnicodeTo4BytesGB18030();
}
PRBool nsUnicodeToGB18030::EncodeSurrogate(
PRUnichar aSurrogateHigh,
PRUnichar aSurrogateLow,
char* aOut)
{
if( IS_HIGH_SURROGATE(aSurrogateHigh) &&
IS_LOW_SURROGATE(aSurrogateLow) )
{
// notice that idx does not include the 0x10000
PRUint32 idx = ((aSurrogateHigh - (PRUnichar)0xD800) << 10 ) |
(aSurrogateLow - (PRUnichar) 0xDC00);
unsigned char *out = (unsigned char*) aOut;
// notice this is from 0x90 for supplment planes
out[0] = (idx / (10*126*10)) + 0x90;
idx %= (10*126*10);
out[1] = (idx / (10*126)) + 0x30;
idx %= (10*126);
out[2] = (idx / (10)) + 0x81;
out[3] = (idx % 10) + 0x30;
return PR_TRUE;
}
return PR_FALSE;
}
#ifdef MOZ_EXTRA_X11CONVERTERS
//-----------------------------------------------------------------------
// nsUnicodeToGB18030Font0
//-----------------------------------------------------------------------
NS_IMETHODIMP nsUnicodeToGB18030Font0::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 2 * aSrcLength;
return NS_OK_UDEC_EXACTLENGTH; // font encoding is only 2 bytes
}
void nsUnicodeToGB18030Font0::Create4BytesEncoder()
{
m4BytesEncoder = nsnull;
}
NS_IMETHODIMP nsUnicodeToGB18030Font0::FillInfo(PRUint32 *aInfo)
{
nsresult rv = nsUnicodeToGB18030::FillInfo(aInfo); // call the super class
if(NS_SUCCEEDED(rv))
{
// mark the first 128 bits as 0. 4 x 32 bits = 128 bits
aInfo[0] = aInfo[1] = aInfo[2] = aInfo[3] = 0;
}
return rv;
}
//-----------------------------------------------------------------------
// nsUnicodeToGB18030Font1
//-----------------------------------------------------------------------
nsUnicodeToGB18030Font1::nsUnicodeToGB18030Font1()
: nsTableEncoderSupport( (uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gb18030_4bytes, 4)
{
}
NS_IMETHODIMP nsUnicodeToGB18030Font1::FillInfo(PRUint32 *aInfo)
{
nsresult res = nsTableEncoderSupport::FillInfo(aInfo);
PRUint32 i;
for(i = (0x0000 >> 5); i<(0x0600 >> 5); i++)
aInfo[i] = 0;
// handle Arabic script
for(i = (0x0600 >> 5); i<(0x06e0 >> 5); i++)
aInfo[i] = 0;
SET_REPRESENTABLE(aInfo, 0x060c);
SET_REPRESENTABLE(aInfo, 0x061b);
SET_REPRESENTABLE(aInfo, 0x061f);
for(i = 0x0626;i <=0x0628;i++)
SET_REPRESENTABLE(aInfo, i);
SET_REPRESENTABLE(aInfo, 0x062a);
for(i = 0x062c;i <=0x062f;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0x0631;i <=0x0634;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0x0639;i <=0x063a;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0x0640;i <=0x064a;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0x0674;i <=0x0678;i++)
SET_REPRESENTABLE(aInfo, i);
SET_REPRESENTABLE(aInfo, 0x067e);
SET_REPRESENTABLE(aInfo, 0x0686);
SET_REPRESENTABLE(aInfo, 0x0698);
SET_REPRESENTABLE(aInfo, 0x06a9);
SET_REPRESENTABLE(aInfo, 0x06ad);
SET_REPRESENTABLE(aInfo, 0x06af);
SET_REPRESENTABLE(aInfo, 0x06be);
for(i = 0x06c5;i <=0x06c9;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0x06cb;i <=0x06cc;i++)
SET_REPRESENTABLE(aInfo, i);
SET_REPRESENTABLE(aInfo, 0x06d0);
SET_REPRESENTABLE(aInfo, 0x06d5);
// end of Arabic script
for(i = (0x06e0 >> 5); i<(0x0f00 >> 5); i++)
aInfo[i] = 0;
// handle Tibetan script
CLEAR_REPRESENTABLE(aInfo, 0x0f48);
for(i = 0x0f6b;i <0x0f71;i++)
CLEAR_REPRESENTABLE(aInfo, i);
for(i = 0x0f8c;i <0x0f90;i++)
CLEAR_REPRESENTABLE(aInfo, i);
CLEAR_REPRESENTABLE(aInfo, 0x0f98);
CLEAR_REPRESENTABLE(aInfo, 0x0fbd);
CLEAR_REPRESENTABLE(aInfo, 0x0fcd);
CLEAR_REPRESENTABLE(aInfo, 0x0fce);
for(i = 0x0fd0;i <0x0fe0;i++)
CLEAR_REPRESENTABLE(aInfo, i);
// end of Tibetan script
for(i = (0x0fe0 >> 5); i<(0x1800 >> 5); i++)
aInfo[i] = 0;
// handle Mongolian script
CLEAR_REPRESENTABLE(aInfo, 0x180f);
for(i = 0x181a;i <0x1820;i++)
CLEAR_REPRESENTABLE(aInfo, i);
for(i = 0x1878;i <0x1880;i++)
CLEAR_REPRESENTABLE(aInfo, i);
for(i = 0x18aa;i <0x18c0;i++)
CLEAR_REPRESENTABLE(aInfo, i);
// end of Mongolian script
for(i = (0x18c0 >> 5); i<(0x3400 >> 5); i++)
aInfo[i] = 0;
// handle Han Ideograph
// remove above U+4db5
// remove U+4db6 to U+4dbf one by one
for(i = 0x4db6;i <0x4dc0;i++)
CLEAR_REPRESENTABLE(aInfo, i);
// end of Han Ideograph
// remove U+4dc0 to 0xa000
for(i = (0x4dc0 >> 5);i < (0xa000>>5) ; i++)
aInfo[i] = 0;
// handle Yi script
for(i = 0xa48d;i <0xa490;i++)
CLEAR_REPRESENTABLE(aInfo, i);
CLEAR_REPRESENTABLE(aInfo, 0xa4a2);
CLEAR_REPRESENTABLE(aInfo, 0xa4a3);
CLEAR_REPRESENTABLE(aInfo, 0xa4b4);
CLEAR_REPRESENTABLE(aInfo, 0xa4c1);
CLEAR_REPRESENTABLE(aInfo, 0xa4c5);
for(i = 0xa4c7;i <0xa4e0;i++)
CLEAR_REPRESENTABLE(aInfo, i);
// end of Yi script
for(i = (0xa4e0 >> 5);i < (0xfb00>>5) ; i++)
aInfo[i] = 0;
// handle Arabic script
for(i = (0xfb00 >> 5);i < (0xfc00>>5) ; i++)
aInfo[i] = 0;
for(i = 0xfb56;i <=0xfb59;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0xfb7a;i <=0xfb95;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0xfbaa;i <=0xfbad;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0xfbd3;i <=0xfbff;i++)
SET_REPRESENTABLE(aInfo, i);
// end of Arabic script
for(i = (0xfc00 >> 5);i < (0xfe80>>5) ; i++)
aInfo[i] = 0;
// handle Arabic script
for(i = (0xfe80 >> 5);i < (0x10000>>5) ; i++)
aInfo[i] = 0;
for(i = 0xfe89;i <=0xfe98;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0xfe9d;i <=0xfeaa;i++)
SET_REPRESENTABLE(aInfo, i);
SET_REPRESENTABLE(aInfo, 0xfead);
for(i = 0xfeae;i <=0xfeb8;i++)
SET_REPRESENTABLE(aInfo, i);
for(i = 0xfec9;i <=0xfef4;i++)
SET_REPRESENTABLE(aInfo, i);
SET_REPRESENTABLE(aInfo, 0xfefb);
SET_REPRESENTABLE(aInfo, 0xfefc);
// end of Arabic script
return res;
}
#endif
//----------------------------------------------------------------------
// Class nsUnicodeToGBK [implementation]
nsUnicodeToGBK::nsUnicodeToGBK(PRUint32 aMaxLength) :
nsEncoderSupport(aMaxLength)
{
mExtensionEncoder = nsnull;
m4BytesEncoder = nsnull;
mUtil.InitToGBKTable();
mSurrogateHigh = 0;
}
void nsUnicodeToGBK::CreateExtensionEncoder()
{
mExtensionEncoder = new nsUnicodeToGBKUniq2Bytes();
}
void nsUnicodeToGBK::Create4BytesEncoder()
{
m4BytesEncoder = nsnull;
}
PRBool nsUnicodeToGBK::TryExtensionEncoder(
PRUnichar aChar,
char* aOut,
PRInt32 *aOutLen
)
{
if( IS_HIGH_SURROGATE(aChar) ||
IS_LOW_SURROGATE(aChar) )
{
// performance tune for surrogate characters
return PR_FALSE;
}
if(! mExtensionEncoder )
CreateExtensionEncoder();
if(mExtensionEncoder)
{
PRInt32 len = 1;
nsresult res = NS_OK;
res = mExtensionEncoder->Convert(&aChar, &len, aOut, aOutLen);
if(NS_SUCCEEDED(res) && (*aOutLen > 0))
return PR_TRUE;
}
return PR_FALSE;
}
PRBool nsUnicodeToGBK::Try4BytesEncoder(
PRUnichar aChar,
char* aOut,
PRInt32 *aOutLen
)
{
if( IS_HIGH_SURROGATE(aChar) ||
IS_LOW_SURROGATE(aChar) )
{
// performance tune for surrogate characters
return PR_FALSE;
}
if(! m4BytesEncoder )
Create4BytesEncoder();
if(m4BytesEncoder)
{
PRInt32 len = 1;
nsresult res = NS_OK;
res = m4BytesEncoder->Convert(&aChar, &len, aOut, aOutLen);
NS_ASSERTION(NS_FAILED(res) || ((1 == len) && (4 == *aOutLen)),
"unexpect conversion length");
if(NS_SUCCEEDED(res) && (*aOutLen > 0))
return PR_TRUE;
}
return PR_FALSE;
}
PRBool nsUnicodeToGBK::EncodeSurrogate(
PRUnichar aSurrogateHigh,
PRUnichar aSurrogateLow,
char* aOut)
{
return PR_FALSE; // GBK cannot encode Surrogate, let the subclass encode it.
}
NS_IMETHODIMP nsUnicodeToGBK::ConvertNoBuff(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
PRInt32 iSrcLength = 0;
PRInt32 iDestLength = 0;
PRUnichar unicode;
nsresult res = NS_OK;
while (iSrcLength < *aSrcLength )
{
unicode = *aSrc;
//if unicode's hi byte has something, it is not ASCII, must be a GB
if(IS_ASCII(unicode))
{
// this is an ASCII
*aDest = CAST_UNICHAR_TO_CHAR(*aSrc);
aDest++; // increment 1 byte
iDestLength +=1;
} else {
char byte1, byte2;
if(mUtil.UnicodeToGBKChar( unicode, PR_FALSE, &byte1, &byte2))
{
// make sure we still have 2 bytes for output first
if(iDestLength+2 > *aDestLength)
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
aDest[0] = byte1;
aDest[1] = byte2;
aDest += 2; // increment 2 bytes
iDestLength +=2;
} else {
PRInt32 aOutLen = 2;
// make sure we still have 2 bytes for output first
if(iDestLength+2 > *aDestLength)
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
// we cannot map in the common mapping. Let's try to
// call the delegated 2 byte converter for the gbk or gb18030
// unique 2 byte mapping
if(TryExtensionEncoder(unicode, aDest, &aOutLen))
{
iDestLength += aOutLen;
aDest += aOutLen;
} else {
// make sure we still have 4 bytes for output first
if(iDestLength+4 > *aDestLength)
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
// we still cannot map. Let's try to
// call the delegated GB18030 4 byte converter
aOutLen = 4;
if( IS_HIGH_SURROGATE(unicode) )
{
if((iSrcLength+1) < *aSrcLength ) {
if(EncodeSurrogate(aSrc[0],aSrc[1], aDest)) {
// since we got a surrogate pair, we need to increment src.
iSrcLength++ ;
aSrc++;
iDestLength += aOutLen;
aDest += aOutLen;
} else {
// only get a high surrogate, but not a low surrogate
res = NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
} else {
mSurrogateHigh = aSrc[0];
break; // this will go to afterwhileloop
}
} else {
if( IS_LOW_SURROGATE(unicode) )
{
if(IS_HIGH_SURROGATE(mSurrogateHigh)) {
if(EncodeSurrogate(mSurrogateHigh, aSrc[0], aDest)) {
iDestLength += aOutLen;
aDest += aOutLen;
} else {
// only get a high surrogate, but not a low surrogate
res = NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
} else {
// only get a low surrogate, but not a low surrogate
res = NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
} else {
if(Try4BytesEncoder(unicode, aDest, &aOutLen))
{
NS_ASSERTION((aOutLen == 4), "we should always generate 4 bytes here");
iDestLength += aOutLen;
aDest += aOutLen;
} else {
res = NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
}
}
}
}
}
iSrcLength++ ; // Each unicode char just count as one in PRUnichar string;
mSurrogateHigh = 0;
aSrc++;
if ( iDestLength >= (*aDestLength) && (iSrcLength < *aSrcLength) )
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
}
//afterwhileloop:
*aDestLength = iDestLength;
*aSrcLength = iSrcLength;
return res;
}
//----------------------------------------------------------------------
// Subclassing of nsTableEncoderSupport class [implementation]
NS_IMETHODIMP nsUnicodeToGBK::FillInfo(PRUint32 *aInfo)
{
mUtil.FillInfo(aInfo, 0x81, 0xFE, 0x40, 0xFE);
if(! mExtensionEncoder )
CreateExtensionEncoder();
if(mExtensionEncoder)
{
nsCOMPtr<nsICharRepresentable> aRep = do_QueryInterface(mExtensionEncoder);
aRep->FillInfo(aInfo);
}
if(! m4BytesEncoder )
Create4BytesEncoder();
if(m4BytesEncoder)
{
nsCOMPtr<nsICharRepresentable> aRep = do_QueryInterface(m4BytesEncoder);
aRep->FillInfo(aInfo);
}
//GBK font lib also have single byte ASCII characters, set them here
for (PRUint16 SrcUnicode = 0x0000; SrcUnicode <= 0x007F; SrcUnicode++)
SET_REPRESENTABLE(aInfo, SrcUnicode);
SET_REPRESENTABLE(aInfo, 0x20ac); // euro
return NS_OK;
}
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