pjs/intl/uconv/ucvcn/nsUnicodeToGB2312V2.cpp

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Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (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 Communicator client 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.
*/
#include "nsUnicodeToGB2312V2.h"
#include "nsUCvCnDll.h"
#define _GBKU_TABLE_ // make the table in the include file to be extern
#include "gbku.h"
//----------------------------------------------------------------------
// Global functions and data [declaration]
//----------------------------------------------------------------------
// Class nsUnicodeToGB2312V2 [implementation]
#define TRUE 1
#define FALSE 0
void nsUnicodeToGB2312V2::UnicodeToGBK(PRUnichar SrcUnicode, DByte *pGBCode)
{
short int iRet = FALSE;
short int i = 0;
short int iGBKToUnicodeIndex = 0;
for ( i=0; i<MAX_GBK_LENGTH; i++)
{
if ( SrcUnicode == GBKToUnicodeTable[i] )
{
iGBKToUnicodeIndex = i;
iRet = TRUE;
break;
}
}
if ( iRet )
{
//convert from one dimensional index to (left, right) pair
if(pGBCode)
{
pGBCode->leftbyte = (char) ( iGBKToUnicodeIndex / 0x00BF + 0x0081) ;
pGBCode->leftbyte |= 0x80;
pGBCode->rightbyte = (char) ( iGBKToUnicodeIndex % 0x00BF+ 0x0040);
pGBCode->rightbyte |= 0x80;
}
}
}
NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
PRInt32 i=0;
PRInt32 iSrcLength = *aSrcLength;
DByte *pDestDBCode;
DByte *pSrcDBCode;
PRInt32 iDestLength = 0;
PRUnichar *pSrc = (PRUnichar *)aSrc;
pDestDBCode = (DByte *)aDest;
for (i=0;i< iSrcLength;i++)
{
pDestDBCode = (DByte *)aDest;
if( (*pSrc) & 0xff00 )
{
// hi byte has something, it is not ASCII, must be a GB
UnicodeToGBK( *pSrc, pDestDBCode);
aDest += 2; // increment 2 bytes
pDestDBCode = (DByte *)aDest;
iDestLength +=2;
}
else
{
// this is an ASCII
pSrcDBCode = (DByte *)pSrc;
*aDest = pSrcDBCode->leftbyte;
aDest++; // increment 1 byte
iDestLength +=1;
}
pSrc++; // increment 2 bytes
if ( iDestLength >= (*aDestLength) )
{
break;
}
}
*aDestLength = iDestLength;
*aSrcLength = i;
return NS_OK;
}
nsresult nsUnicodeToGB2312V2::CreateInstance(nsISupports ** aResult)
{
nsIUnicodeEncoder *p = new nsUnicodeToGB2312V2();
if(p) {
*aResult = p;
return NS_OK;
}
return NS_ERROR_OUT_OF_MEMORY;
}
//----------------------------------------------------------------------
// Subclassing of nsTableEncoderSupport class [implementation]
NS_IMETHODIMP nsUnicodeToGB2312V2::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = 2 * aSrcLength;
return NS_OK;
}
#define SET_REPRESENTABLE(info, c) (info)[(c) >> 5] |= (1L << ((c) & 0x1f))
NS_IMETHODIMP nsUnicodeToGB2312V2::FillInfo(PRUint32 *aInfo)
{
short int i,j;
PRUnichar SrcUnicode;
PRUint16 k;
for ( k=0; k++;k<65536)
{
aInfo[k] = 0x0000;
}
// valid GBK rows are in 0x81 to 0xFE
for ( i=0x81;i++;i<0xFE)
{
// HZ and GB2312 starts at row 0x21|0x80
if ( i < ( 0x21 | 0x80))
continue;
// valid GBK columns are in 0x41 to 0xFE
for( j=0x41; j++; j<0xFE)
{
//HZ and GB2312 starts at col 0x21 | 0x80
if ( j < (0x21 | 0x80))
continue;
// k is index in GBKU.H table
k = (i - 0x81)*(0xFE - 0x80)+(j-0x41);
// sanity check
if ( (k>=0) && ( k < MAX_GBK_LENGTH))
{
SrcUnicode = GBKToUnicodeTable[i];
if (( SrcUnicode != 0xFFFF ) && (SrcUnicode != 0xFFFD) )
{
SET_REPRESENTABLE(aInfo, SrcUnicode);
}
}
}
}
return NS_OK;
}