зеркало из https://github.com/mozilla/gecko-dev.git
check in fix of 34617 for Xu.Yueheng@intel.com r=ftang@netscape.com
Use the new implementation for GB2312GL
This commit is contained in:
ftang%netscape.com
Родитель
ddc27ae041
Коммит
f6f5127a5f
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@ -18,35 +18,129 @@
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* Rights Reserved.
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*
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* Contributor(s):
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* Yueheng Xu, yueheng.xu@intel.com
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*/
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#include "nsUnicodeToGB2312GL.h"
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#include "nsUCvCnDll.h"
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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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static PRInt16 g_2BytesShiftTable[] = {
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0, u2BytesCharset,
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ShiftCell(0,0,0,0,0,0,0,0)
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};
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#define _GBKU_TABLE_ // use a shared table
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#include "gbku.h"
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//----------------------------------------------------------------------
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// Class nsUnicodeToGB2312GL [implementation]
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nsUnicodeToGB2312GL::nsUnicodeToGB2312GL()
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: nsTableEncoderSupport(
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(uShiftTable*) &g_2BytesShiftTable,
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(uMappingTable*) &g_ufGB2312Mapping)
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#define TRUE 1
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#define FALSE 0
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nsUnicodeToGB2312GL::nsUnicodeToGB2312GL()
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{
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PRUint8 left, right;
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PRUnichar unicode;
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PRUint16 i;
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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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}
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NS_IMETHODIMP nsUnicodeToGB2312GL::ConvertNoBuff(const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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{
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PRInt32 i=0;
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PRInt32 iSrcLength = 0;
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DByte *pDestDBCode;
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PRInt32 iDestLength = 0;
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PRUnichar unicode;
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PRUint8 left, right;
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nsresult res = NS_OK;
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PRUnichar *pSrc = (PRUnichar *)aSrc;
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pDestDBCode = (DByte *)aDest;
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while( iSrcLength < *aSrcLength )
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{
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pDestDBCode = (DByte *)aDest;
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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 & 0x7f;
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pDestDBCode->rightbyte = UnicodeToGBKTable[unicode].rightbyte & 0x7f;
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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) & 0x7f ;
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right = (char) ( i % 0x00BF+ 0x0040) & 0x7f;
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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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iSrcLength +=2;
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pSrc++; // increment 2 bytes
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}
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else
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{ // This is ASCII, not expected, report error.
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res = NS_ERROR_UENC_NOMAPPING;
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break;
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}
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// if dest buffer not big enough, handles it here.
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if ( (iDestLength >= *aDestLength) && (iSrcLength > 0) )
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{
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res = NS_OK_UENC_MOREOUTPUT;
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break;
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}
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}
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*aDestLength = iDestLength;
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*aSrcLength = iSrcLength;
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return res;
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}
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nsresult nsUnicodeToGB2312GL::CreateInstance(nsISupports ** aResult)
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{
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nsIUnicodeEncoder *p = new nsUnicodeToGB2312GL();
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if(p) {
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*aResult = p;
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return NS_OK;
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*aResult = p;
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return NS_OK;
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}
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return NS_ERROR_OUT_OF_MEMORY;
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}
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@ -59,5 +153,45 @@ NS_IMETHODIMP nsUnicodeToGB2312GL::GetMaxLength(const PRUnichar * aSrc,
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PRInt32 * aDestLength)
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{
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*aDestLength = 2 * aSrcLength;
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return NS_OK_UENC_EXACTLENGTH;
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return NS_OK;
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}
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#define SET_REPRESENTABLE(info, c) (info)[(c) >> 5] |= (1L << ((c) & 0x1f))
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NS_IMETHODIMP nsUnicodeToGB2312GL::FillInfo(PRUint32 *aInfo)
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{
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PRUint16 i,j, k;
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PRUnichar SrcUnicode;
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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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// valid GBK rows are in 0x81 to 0xFE
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for ( i=0x0081;i<0x00FF;i++)
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{
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// HZ and GB2312 starts at row 0x21|0x80 = 0xA1
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if ( i < 0xA1 )
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continue;
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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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}
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@ -18,6 +18,7 @@
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* Rights Reserved.
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*
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* Contributor(s):
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* Yueheng Xu, yueheng.xu@intel.com
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*/
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#ifndef nsUnicodeToGB2312GL_h___
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@ -33,28 +34,50 @@
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*
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* @created 06/Apr/1999
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* @author Catalin Rotaru [CATA]
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* @Modified to use the newer tables in file gbku.h.
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* Yueheng.xu@intel.com. 3/May/2000
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*/
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class nsUnicodeToGB2312GL : public nsTableEncoderSupport
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class nsUnicodeToGB2312GL : public nsEncoderSupport
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{
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public:
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/**
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* Class constructor.
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*/
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nsUnicodeToGB2312GL();
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virtual ~nsUnicodeToGB2312GL(){};
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/**
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* Static class constructor.
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*/
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static nsresult CreateInstance(nsISupports **aResult);
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protected:
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NS_IMETHOD ConvertNoBuff(const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength);
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//--------------------------------------------------------------------
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// Subclassing of nsEncoderSupport class [declaration]
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NS_IMETHOD GetMaxLength(const PRUnichar * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength);
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NS_IMETHOD ConvertNoBuffNoErr(const PRUnichar * aSrc, PRInt32 * aSrcLength,
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char * aDest, PRInt32 * aDestLength)
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{
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return NS_OK;
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}; // just make it not abstract;
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NS_IMETHOD FillInfo(PRUint32 *aInfo);
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private:
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typedef struct
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{
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char leftbyte;
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char rightbyte;
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} DByte;
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};
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#endif /* nsUnicodeToGB2312GL_h___ */
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