mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/intl/uconv/ucvcn/nsUnicodeToGBK.cpp

365 строки
11 KiB
C++
Исходник Ответственный История

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
/**
* 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"
//-------------------------------------------------------------
// Global table initialization function defined in gbku.h
//-------------------------------------------------------------
static PRInt16 g_2BytesShiftTable[] = {
0, u2BytesCharset,
ShiftCell(0,0,0,0,0,0,0,0)
};
static PRInt16 g_4BytesGB18030ShiftTable[] = {
0, u4BytesGB18030Charset,
ShiftCell(0,0,0,0,0,0,0,0)
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGB18030 and nsUnicodeToGB18030Font0
// nsUnicodeToGB18030Uniq2Bytes
//-----------------------------------------------------------------------
static PRUint16 g_uf_gb18030_2bytes[] = {
#include "gb18030uniq2b.uf"
};
class nsUnicodeToGB18030Uniq2Bytes : public nsTableEncoderSupport
{
public:
nsUnicodeToGB18030Uniq2Bytes()
: nsTableEncoderSupport((uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gb18030_2bytes) {};
protected:
NS_IMETHOD GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 2 * aSrcLength;
return NS_OK;
};
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGB18030
// nsUnicodeTo4BytesGB18030
//-----------------------------------------------------------------------
static PRUint16 g_uf_gb18030_4bytes[] = {
#include "gb180304bytes.uf"
};
class nsUnicodeTo4BytesGB18030 : public nsTableEncoderSupport
{
public:
nsUnicodeTo4BytesGB18030()
: nsTableEncoderSupport( (uShiftTable*) &g_4BytesGB18030ShiftTable,
(uMappingTable*) &g_uf_gb18030_4bytes) {};
protected:
NS_IMETHOD GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 4 * aSrcLength;
return NS_OK_UDEC_EXACTLENGTH;
};
};
//-----------------------------------------------------------------------
// Private class used by nsUnicodeToGBK
// nsUnicodeToGBKUniq2Bytes
//-----------------------------------------------------------------------
static PRUint16 g_uf_gbk_2bytes[] = {
#include "gbkuniq2b.uf"
};
class nsUnicodeToGBKUniq2Bytes : public nsTableEncoderSupport
{
public:
nsUnicodeToGBKUniq2Bytes()
: nsTableEncoderSupport( (uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gbk_2bytes) {};
protected:
NS_IMETHOD GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 2 * aSrcLength;
return NS_OK_UDEC_EXACTLENGTH;
};
};
//-----------------------------------------------------------------------
// nsUnicodeToGB18030
//-----------------------------------------------------------------------
void nsUnicodeToGB18030::CreateExtensionEncoder()
{
mExtensionEncoder = new nsUnicodeToGB18030Uniq2Bytes();
}
void nsUnicodeToGB18030::Create4BytesEncoder()
{
m4BytesEncoder = new nsUnicodeTo4BytesGB18030();
}
NS_IMETHODIMP nsUnicodeToGB18030::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 4 * aSrcLength;
return NS_OK;
}
//-----------------------------------------------------------------------
// 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;
}
//-----------------------------------------------------------------------
// nsUnicodeToGB18030Font1
//-----------------------------------------------------------------------
nsUnicodeToGB18030Font1::nsUnicodeToGB18030Font1()
: nsTableEncoderSupport( (uShiftTable*) &g_2BytesShiftTable,
(uMappingTable*) &g_uf_gb18030_4bytes)
{
}
NS_IMETHODIMP nsUnicodeToGB18030Font1::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 4 * aSrcLength;
return NS_OK_UDEC_EXACTLENGTH; // font encoding is exactly 4 bytes
}
NS_IMETHODIMP nsUnicodeToGB18030Font1::FillInfo(PRUint32 *aInfo)
{
nsresult res = nsTableEncoderSupport::FillInfo(aInfo);
// remove below U+3400
PRUint32 i;
for(i = 0; i<(0x3400 >> 5); i++)
aInfo[i] = 0;
// remove above U+4db5
// remove U+4db5 to U+4dbf one by one
for(i = 0x4db5;i <0x4dc0;i++)
CLEAR_REPRESENTABLE(aInfo, i);
// remove above U+4dc0
for(i = (0x4dc0 >> 5);i < (0x10000>>5) ; i++)
aInfo[i] = 0;
return res;
}
//----------------------------------------------------------------------
// Class nsUnicodeToGBK [implementation]
nsUnicodeToGBK::nsUnicodeToGBK()
{
mExtensionEncoder = nsnull;
m4BytesEncoder = nsnull;
mUtil.InitToGBKTable();
}
void nsUnicodeToGBK::CreateExtensionEncoder()
{
mExtensionEncoder = new nsUnicodeToGBKUniq2Bytes();
}
void nsUnicodeToGBK::Create4BytesEncoder()
{
m4BytesEncoder = nsnull;
}
PRBool nsUnicodeToGBK::TryExtensionEncoder(
PRUnichar aChar,
char* aOut,
PRInt32 *aOutLen
)
{
if(! mExtensionEncoder )
CreateExtensionEncoder();
if(mExtensionEncoder)
{
PRInt32 len = 1;
nsresult res = NS_OK;
res = mExtensionEncoder->Convert(&aChar, &len, aOut, aOutLen);
if(NS_SUCCEEDED(res))
return PR_TRUE;
}
return PR_FALSE;
}
PRBool nsUnicodeToGBK::Try4BytesEncoder(
PRUnichar aChar,
char* aOut,
PRInt32 *aOutLen
)
{
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))
return PR_TRUE;
}
return PR_FALSE;
}
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(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;
break;
}
}
}
}
iSrcLength++ ; // Each unicode char just count as one in PRUnichar string;
aSrc++;
if ( iDestLength >= (*aDestLength) && (iSrcLength < *aSrcLength) )
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
}
*aDestLength = iDestLength;
*aSrcLength = iSrcLength;
return res;
}
//----------------------------------------------------------------------
// Subclassing of nsTableEncoderSupport class [implementation]
NS_IMETHODIMP nsUnicodeToGBK::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 2 * aSrcLength;
return NS_OK;
}
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;
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку