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"
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#define _GBKU_TABLE_ // use a shared table
#include "gbku.h"
//----------------------------------------------------------------------
// Class nsUnicodeToGB2312V2 [implementation]
#define TRUE 1
#define FALSE 0
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nsUnicodeToGB2312V2::nsUnicodeToGB2312V2()
{
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PRUint8 left, right;
PRUnichar unicode;
PRUint16 i;
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for ( i=0; i<MAX_GBK_LENGTH; i++ )
{
left = ( i / 0x00BF + 0x0081);
right = ( i % 0x00BF+ 0x0040);
unicode = GBKToUnicodeTable[i];
// to reduce size of UnicodeToGBKTable, we only do direct unicode to GB
// table mapping between unicode 0x4E00 and 0xA000. Others by searching
// GBKToUnicodeTable. There is a trade off between memory usage and speed.
if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ))
{
unicode -= 0x4E00;
UnicodeToGBKTable[unicode].leftbyte = left;
UnicodeToGBKTable[unicode].rightbyte = right;
}
}
}
NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
PRInt32 i=0;
PRInt32 iSrcLength = *aSrcLength;
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DByte *pDestDBCode;
DByte *pSrcDBCode;
PRInt32 iDestLength = 0;
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PRUnichar unicode;
PRUint8 left, right;
PRUnichar *pSrc = (PRUnichar *)aSrc;
pDestDBCode = (DByte *)aDest;
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for (i=0;i< iSrcLength;i++)
{
pDestDBCode = (DByte *)aDest;
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unicode = *pSrc;
//if unicode's hi byte has something, it is not ASCII, must be a GB
if( unicode & 0xff00 )
{
// To reduce the UnicodeToGBKTable size, we only use direct table mapping
// for unicode between 0x4E00 - 0xA000
if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ) )
{
unicode -= 0x4E00;
pDestDBCode->leftbyte = UnicodeToGBKTable[unicode].leftbyte ;
pDestDBCode->rightbyte = UnicodeToGBKTable[unicode].rightbyte ;
}
else
{
// other ones we search in GBK to Unicode table
for ( i=0; i<MAX_GBK_LENGTH; i++)
{
if ( unicode == GBKToUnicodeTable[i] )
{
//this manipulation handles the little endian / big endian issues
left = (char) ( i / 0x00BF + 0x0081) | 0x80 ;
right = (char) ( i % 0x00BF+ 0x0040) | 0x80;
pDestDBCode->leftbyte = left;
pDestDBCode->rightbyte = right;
}
}
}
// UnicodeToGBK( *pSrc, pDestDBCode);
aDest += 2; // increment 2 bytes
pDestDBCode = (DByte *)aDest;
iDestLength +=2;
}
else
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{
// this is an ASCII
pSrcDBCode = (DByte *)pSrc;
*aDest = pSrcDBCode->leftbyte;
aDest++; // increment 1 byte
iDestLength +=1;
}
pSrc++; // increment 2 bytes
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if ( iDestLength >= (*aDestLength) )
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{
break;
}
}
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*aDestLength = iDestLength;
*aSrcLength = i;
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return NS_OK;
}
nsresult nsUnicodeToGB2312V2::CreateInstance(nsISupports ** aResult)
{
nsIUnicodeEncoder *p = new nsUnicodeToGB2312V2();
if(p) {
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*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)
{
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PRUint16 i,j, k;
PRUnichar SrcUnicode;
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// aInfo should already been initialized as 2048 element array of 32 bit by caller
NS_ASSERTION( sizeof(aInfo[0]) == 4, "aInfo size incorrect" );
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// valid GBK rows are in 0x81 to 0xFE
for ( i=0x0081;i<0x00FF;i++)
{
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// HZ and GB2312 starts at row 0x21|0x80 = 0xA1
if ( i < 0xA1 )
continue;
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// valid GBK columns are in 0x41 to 0xFE
for( j=0x0041;j<0x00FF;j++)
{
//HZ and GB2312 starts at col 0x21 | 0x80 = 0xA1
if ( j < 0xA1 )
continue;
// k is index in GBKU.H table
k = (i - 0x0081)*(0x00FE - 0x0080)+(j-0x0041);
SrcUnicode = GBKToUnicodeTable[k];
if (( SrcUnicode != 0xFFFF ) && (SrcUnicode != 0xFFFD) )
{
SET_REPRESENTABLE(aInfo, SrcUnicode);
}
}
}
return NS_OK;
}