1999-09-08 00:04:53 +04:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsUnicodeToGB2312V2.h"
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#include "nsUCvCnDll.h"
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1999-10-21 04:17:48 +04:00
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#define _GBKU_TABLE_ // use a shared table
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1999-09-22 07:35:31 +04:00
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#include "gbku.h"
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1999-09-08 00:04:53 +04:00
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//----------------------------------------------------------------------
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// Class nsUnicodeToGB2312V2 [implementation]
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#define TRUE 1
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#define FALSE 0
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1999-10-21 04:17:48 +04:00
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nsUnicodeToGB2312V2::nsUnicodeToGB2312V2()
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1999-09-08 00:04:53 +04:00
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{
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1999-10-21 04:17:48 +04:00
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PRUint8 left, right;
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PRUnichar unicode;
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PRUint16 i;
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1999-09-08 00:04:53 +04:00
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1999-10-21 04:17:48 +04:00
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for ( i=0; i<MAX_GBK_LENGTH; i++ )
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{
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left = ( i / 0x00BF + 0x0081);
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right = ( i % 0x00BF+ 0x0040);
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unicode = GBKToUnicodeTable[i];
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// to reduce size of UnicodeToGBKTable, we only do direct unicode to GB
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// table mapping between unicode 0x4E00 and 0xA000. Others by searching
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// GBKToUnicodeTable. There is a trade off between memory usage and speed.
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if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ))
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{
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unicode -= 0x4E00;
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UnicodeToGBKTable[unicode].leftbyte = left;
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UnicodeToGBKTable[unicode].rightbyte = right;
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}
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}
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1999-09-08 00:04:53 +04:00
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}
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NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc,
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1999-10-21 04:17:48 +04:00
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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1999-09-08 00:04:53 +04:00
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{
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PRInt32 i=0;
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PRInt32 iSrcLength = *aSrcLength;
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1999-10-21 04:17:48 +04:00
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DByte *pDestDBCode;
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DByte *pSrcDBCode;
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1999-09-08 00:04:53 +04:00
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PRInt32 iDestLength = 0;
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1999-10-21 04:17:48 +04:00
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PRUnichar unicode;
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PRUint8 left, right;
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1999-09-08 00:04:53 +04:00
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PRUnichar *pSrc = (PRUnichar *)aSrc;
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pDestDBCode = (DByte *)aDest;
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1999-10-21 04:17:48 +04:00
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for (i=0;i< iSrcLength;i++)
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1999-09-08 00:04:53 +04:00
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{
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pDestDBCode = (DByte *)aDest;
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1999-10-21 04:17:48 +04:00
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unicode = *pSrc;
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//if unicode's hi byte has something, it is not ASCII, must be a GB
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if( unicode & 0xff00 )
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{
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// To reduce the UnicodeToGBKTable size, we only use direct table mapping
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// for unicode between 0x4E00 - 0xA000
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if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ) )
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{
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unicode -= 0x4E00;
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pDestDBCode->leftbyte = UnicodeToGBKTable[unicode].leftbyte ;
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pDestDBCode->rightbyte = UnicodeToGBKTable[unicode].rightbyte ;
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}
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else
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{
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// other ones we search in GBK to Unicode table
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for ( i=0; i<MAX_GBK_LENGTH; i++)
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{
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if ( unicode == GBKToUnicodeTable[i] )
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{
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//this manipulation handles the little endian / big endian issues
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left = (char) ( i / 0x00BF + 0x0081) | 0x80 ;
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right = (char) ( i % 0x00BF+ 0x0040) | 0x80;
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pDestDBCode->leftbyte = left;
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pDestDBCode->rightbyte = right;
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}
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}
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}
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// UnicodeToGBK( *pSrc, pDestDBCode);
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aDest += 2; // increment 2 bytes
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pDestDBCode = (DByte *)aDest;
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iDestLength +=2;
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}
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1999-09-08 00:04:53 +04:00
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else
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{
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// this is an ASCII
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pSrcDBCode = (DByte *)pSrc;
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*aDest = pSrcDBCode->leftbyte;
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aDest++; // increment 1 byte
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iDestLength +=1;
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}
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1999-09-08 00:04:53 +04:00
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pSrc++; // increment 2 bytes
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1999-10-21 04:17:48 +04:00
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1999-09-08 00:04:53 +04:00
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if ( iDestLength >= (*aDestLength) )
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1999-10-21 04:17:48 +04:00
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{
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break;
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}
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1999-09-08 00:04:53 +04:00
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}
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1999-10-21 04:17:48 +04:00
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1999-09-08 00:04:53 +04:00
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*aDestLength = iDestLength;
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*aSrcLength = i;
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1999-10-21 04:17:48 +04:00
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return NS_OK;
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1999-09-08 00:04:53 +04:00
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}
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nsresult nsUnicodeToGB2312V2::CreateInstance(nsISupports ** aResult)
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{
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nsIUnicodeEncoder *p = new nsUnicodeToGB2312V2();
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if(p) {
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1999-10-21 04:17:48 +04:00
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*aResult = p;
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return NS_OK;
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1999-09-08 00:04:53 +04:00
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}
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return NS_ERROR_OUT_OF_MEMORY;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsTableEncoderSupport class [implementation]
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NS_IMETHODIMP nsUnicodeToGB2312V2::GetMaxLength(const PRUnichar * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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*aDestLength = 2 * aSrcLength;
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return NS_OK;
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}
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1999-09-22 07:35:31 +04:00
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#define SET_REPRESENTABLE(info, c) (info)[(c) >> 5] |= (1L << ((c) & 0x1f))
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NS_IMETHODIMP nsUnicodeToGB2312V2::FillInfo(PRUint32 *aInfo)
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{
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1999-10-21 04:17:48 +04:00
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PRUint16 i,j, k;
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PRUnichar SrcUnicode;
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1999-09-22 07:35:31 +04:00
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1999-10-21 04:17:48 +04:00
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// aInfo should already been initialized as 2048 element array of 32 bit by caller
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NS_ASSERTION( sizeof(aInfo[0]) == 4, "aInfo size incorrect" );
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1999-09-22 07:35:31 +04:00
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1999-10-21 04:17:48 +04:00
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// valid GBK rows are in 0x81 to 0xFE
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for ( i=0x0081;i<0x00FF;i++)
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1999-09-22 07:35:31 +04:00
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{
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1999-10-21 04:17:48 +04:00
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// HZ and GB2312 starts at row 0x21|0x80 = 0xA1
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if ( i < 0xA1 )
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1999-09-22 07:35:31 +04:00
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continue;
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1999-10-21 04:17:48 +04:00
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// valid GBK columns are in 0x41 to 0xFE
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for( j=0x0041;j<0x00FF;j++)
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{
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//HZ and GB2312 starts at col 0x21 | 0x80 = 0xA1
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if ( j < 0xA1 )
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continue;
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// k is index in GBKU.H table
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k = (i - 0x0081)*(0x00FE - 0x0080)+(j-0x0041);
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SrcUnicode = GBKToUnicodeTable[k];
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if (( SrcUnicode != 0xFFFF ) && (SrcUnicode != 0xFFFD) )
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{
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SET_REPRESENTABLE(aInfo, SrcUnicode);
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}
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}
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}
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return NS_OK;
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1999-09-22 07:35:31 +04:00
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}
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