зеркало из https://github.com/mozilla/gecko-dev.git
check in HZ to Unicode contributed by Xu, Yueheng <yueheng.xu@intel.com>
This commit is contained in:
ftang%netscape.com
Родитель
395aba6051
Коммит
dbe706448c
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@ -15,3 +15,215 @@
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/**
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* A character set converter from GBK to Unicode.
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*
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*
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* @created 08/Sept/1999
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* @author Yueheng Xu, Yueheng.Xu@intel.com
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*
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* Note: in this HZ-GB-2312 converter, we accept a string composed of 7-bit HZ
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* encoded Chinese chars,as it is defined in RFC1843 available at
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* http://www.cis.ohio-state.edu/htbin/rfc/rfc1843.html
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* and RFC1842 available at http://www.cis.ohio-state.edu/htbin/rfc/rfc1842.html.
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*
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* In an effort to match the similar extended capability of Microsoft Internet Explorer
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* 5.0. We also accept the 8-bit GB encoded chars mixed in a HZ string.
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* But this should not be a recommendedd practice for HTML authors.
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*
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* The priority of converting are as follows: first convert 8-bit GB code; then,
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* consume HZ ESC sequences such as '~{', '~}', '~~'; then, depending on the current
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* state ( default to ASCII state ) of the string, each 7-bit char is converted as an
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* ASCII, or two 7-bit chars are converted into a Chinese character.
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*/
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#include "nsUCvCnDll.h"
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#include "nsHZToUnicode.h"
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#define _GBKU_TABLE_ // to use a shared GBKU table
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#include "gbku.h"
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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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//----------------------------------------------------------------------
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// Class nsHZToUnicode [implementation]
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nsresult nsHZToUnicode::CreateInstance(nsISupports ** aResult)
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{
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*aResult = new nsHZToUnicode();
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return (*aResult == NULL)? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsTablesDecoderSupport class [implementation]
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NS_IMETHODIMP nsHZToUnicode::GetMaxLength(const char * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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// we are a single byte to Unicode converter, so...
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*aDestLength = aSrcLength;
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return NS_OK_UDEC_EXACTLENGTH;
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}
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//convert the 7-bit HZ into an 8-bit GB index of the GBK table and get its unicode
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void nsHZToUnicode::HZToUnicode(DByte *pGBCode, PRUnichar * pUnicode)
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{
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//we are re-using the GBK's GB to Unicode mapping table.
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PRInt16 iGBKToUnicodeIndex;
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if(pGBCode)
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iGBKToUnicodeIndex = ( (short int)(pGBCode->leftbyte) | 0x80- 0x81)*0xbf +( (short int)(pGBCode->rightbyte) | 0x80 - 0x40);
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if( (iGBKToUnicodeIndex >= 0 ) && ( iGBKToUnicodeIndex < MAX_GBK_LENGTH) )
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{
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*pUnicode = GBKToUnicodeTable[iGBKToUnicodeIndex];
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}
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else
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*pUnicode = GB_UNDEFINED;
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}
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//convert the 8-bit GB index to its unicode by GBK table
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void nsHZToUnicode::GBToUnicode(DByte *pGBCode, PRUnichar * pUnicode)
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{
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//we are re-using the GBK's GB to Unicode mapping table.
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PRInt16 iGBKToUnicodeIndex;
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if(pGBCode)
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iGBKToUnicodeIndex = ( (short int)pGBCode->leftbyte - 0x81)*0xbf +( (short int)pGBCode->rightbyte - 0x40);
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if( (iGBKToUnicodeIndex >= 0 ) && ( iGBKToUnicodeIndex < MAX_GBK_LENGTH) )
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{
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*pUnicode = GBKToUnicodeTable[iGBKToUnicodeIndex];
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}
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else
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*pUnicode = GB_UNDEFINED;
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}
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//Overwriting the ConvertNoBuff() in nsUCvCnSupport.cpp.
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NS_IMETHODIMP nsHZToUnicode::ConvertNoBuff(const char* aSrc,
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PRInt32 * aSrcLength,
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PRUnichar *aDest,
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PRInt32 * aDestLength)
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{
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#define HZ_STATE_GB 1
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#define HZ_STATE_ASCII 2
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#define HZ_STATE_TILD 3
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#define HZLEAD1 '~'
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#define HZLEAD2 '{'
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#define HZLEAD3 '}'
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static PRInt16 hz_state = HZ_STATE_ASCII; // per HZ spec, default to ASCII state
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short int i=0;
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short int iSrcLength = (short int)(*aSrcLength);
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DByte *pSrcDBCode = (DByte *)aSrc;
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PRUnichar *pDestDBCode = (PRUnichar *)aDest;
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int iDestlen = 0;
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char ch1, ch2;
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nsresult res = NS_OK;
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for (i=0;i<iSrcLength;i++)
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{
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pSrcDBCode = (DByte *)aSrc;
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pDestDBCode = aDest;
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if ( iDestlen >= (*aDestLength) )
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{
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res = NS_OK_UDEC_MOREOUTPUT;
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break;
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}
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if ( *aSrc & 0x80 ) // if it is a 8-bit byte
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{
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// The source is a 8-bit GBCode
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GBToUnicode(pSrcDBCode, pDestDBCode);
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aSrc += 2;
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i++;
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iDestlen++;
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aDest++;
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*aSrcLength = i+1;
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continue;
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}
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// otherwise, it is a 7-bit byte
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// The source will be an ASCII or a 7-bit HZ code depending on ch1
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ch1 = *aSrc;
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ch2 = *(aSrc+1);
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if (ch1 == HZLEAD1 ) // if it is lead by '~'
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{
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switch (ch2)
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{
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case HZLEAD2: // we got a '~{'
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// we are switching to HZ state
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hz_state = HZ_STATE_GB;
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aSrc += 2;
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i++;
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break;
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case HZLEAD3: // we got a '~}'
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// we are switching to ASCII state
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hz_state = HZ_STATE_ASCII;
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aSrc += 2;
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i++;
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break;
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case HZLEAD1: // we got a '~~', process like an ASCII, but no state change
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aSrc++;
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*pDestDBCode = (PRUnichar) ( ((char)(*aSrc) )& 0x00ff);
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aSrc++;
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iDestlen++;
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aDest++;
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break;
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default:
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// undefined ESC sequence '~X' are ignored since this is a illegal combination
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aSrc += 2;
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break;
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};
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continue;// go for next loop
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}
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// ch1 != '~'
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switch (hz_state)
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{
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case HZ_STATE_GB:
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// the following chars are HZ
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HZToUnicode(pSrcDBCode, pDestDBCode);
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aSrc += 2;
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i++;
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iDestlen++;
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aDest++;
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break;
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case HZ_STATE_ASCII:
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default:
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// default behavior also like an ASCII
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// when the source is an ASCII
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*pDestDBCode = (PRUnichar) ( ((char)(*aSrc) )& 0x00ff);
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aSrc++;
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iDestlen++;
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aDest++;
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break;
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}
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*aSrcLength = i+1;
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}// for loop
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*aDestLength = iDestlen;
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return NS_OK;
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}
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@ -15,3 +15,61 @@
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsHZToUnicode_h___
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#define nsHZToUnicode_h___
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#include "nsUCvCnSupport.h"
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//----------------------------------------------------------------------
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// Class nsHZToUnicode [declaration]
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/**
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* A character set converter from GBK to Unicode.
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*
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*
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* @created 08/Sept/1999
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* @author Yueheng Xu, Yueheng.Xu@intel.com
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*/
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class nsHZToUnicode : public nsBufferDecoderSupport
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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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nsHZToUnicode() {};
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virtual ~nsHZToUnicode() {};
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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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//--------------------------------------------------------------------
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// Subclassing of nsDecoderSupport class [declaration]
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NS_IMETHOD ConvertNoBuff(const char* aSrc,
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PRInt32 * aSrcLength,
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PRUnichar *aDest,
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PRInt32 * aDestLength);
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NS_IMETHOD GetMaxLength(const char * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength);
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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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void HZToUnicode(DByte *pGBCode, PRUnichar * pUnicode);
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void GBToUnicode(DByte *pGBCode, PRUnichar * pUnicode);
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};
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#endif /* nsHZToUnicode_h___ */
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@ -29,6 +29,8 @@
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#include "nsICharsetConverterInfo.h"
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#include "nsUCvCnCID.h"
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#include "nsUCvCnDll.h"
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#include "nsHZToUnicode.h"
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#include "nsUnicodeToHZ.h"
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#include "nsGBKToUnicode.h"
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#include "nsUnicodeToGBK.h"
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#include "nsGB2312ToUnicodeV2.h"
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@ -117,6 +119,12 @@ FactoryData g_FactoryData[] =
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"Unicode",
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"x-gbk"
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},
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{
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&kHZToUnicodeCID,
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nsHZToUnicode::CreateInstance,
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"HZ-GB-2312",
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"Unicode"
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},
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{
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&kUnicodeToGB2312GLCID,
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nsUnicodeToGB2312GL::CreateInstance,
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