mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-07 04:05:49 +00:00
303 lines
8.6 KiB
C++
303 lines
8.6 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public
|
|
* License Version 1.1 (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.org 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.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* This Unicode to HZ converter is a contribution from Intel Corporation
|
|
* to the mozilla project.
|
|
*/
|
|
/**
|
|
* A character set converter from Unicode to HZ.
|
|
*
|
|
*
|
|
* @created 08/Sept/1999
|
|
* @author Yueheng Xu, Yueheng.Xu@intel.com
|
|
* Revision History
|
|
* 04/Oct/1999. Yueheng Xu: Fixed line continuation problem when line
|
|
* ended by '~';
|
|
* Used table UnicodeToGBK[] to speed up the mapping.
|
|
*/
|
|
|
|
#include "nsUnicodeToHZ.h"
|
|
#include "nsUCvCnDll.h"
|
|
|
|
#define _GBKU_TABLE_ // to use a shared GBKU table
|
|
#include "gbku.h"
|
|
|
|
//----------------------------------------------------------------------
|
|
// Class nsUnicodeToGBK [implementation]
|
|
|
|
#define TRUE 1
|
|
#define FALSE 0
|
|
|
|
void nsUnicodeToHZ::UnicodeToGBK(PRUnichar SrcUnicode, DByte *pGBCode)
|
|
{
|
|
PRUnichar unicode;
|
|
PRUint8 left, right;
|
|
|
|
unicode = SrcUnicode;
|
|
|
|
//if unicode's hi byte has something, it is not ASCII, must be a GB
|
|
NS_ASSERTION( unicode & 0xff00, "expect a GB" );
|
|
|
|
// To reduce the UnicodeToGBKTable size, we only use direct table mapping
|
|
// for unicode between 0x4E00 - 0xA000
|
|
if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ) )
|
|
{
|
|
unicode -= 0x4E00;
|
|
left = UnicodeToGBKTable[unicode].leftbyte ;
|
|
right = UnicodeToGBKTable[unicode].rightbyte ;
|
|
pGBCode->leftbyte = left;
|
|
pGBCode->rightbyte = right;
|
|
}
|
|
else
|
|
{
|
|
// other ones we search in GBK to Unicode table
|
|
for ( PRUint16 i=0; i<MAX_GBK_LENGTH; i++)
|
|
{
|
|
if ( unicode == GBKToUnicodeTable[i] )
|
|
{
|
|
left = (PRUint8) ( i / 0x00BF + 0x0081) | 0x80 ;
|
|
right = (PRUint8) ( i % 0x00BF+ 0x0040) | 0x80;
|
|
pGBCode->leftbyte = left;
|
|
pGBCode->rightbyte = right;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void nsUnicodeToHZ::UnicodeToHZ(PRUnichar SrcUnicode, DByte *pGBCode)
|
|
{
|
|
PRUnichar unicode;
|
|
PRUint8 left, right;
|
|
|
|
unicode = SrcUnicode;
|
|
|
|
//if unicode's hi byte has something, it is not ASCII, must be a GB
|
|
NS_ASSERTION( unicode & 0xff00, "expect a GB" );
|
|
|
|
// To reduce the UnicodeToGBKTable size, we only use direct table mapping
|
|
// for unicode between 0x4E00 - 0xA000
|
|
if ( (unicode >= 0x4E00 ) && ( unicode <= 0xA000 ) )
|
|
{
|
|
unicode -= 0x4E00;
|
|
left = UnicodeToGBKTable[unicode].leftbyte ;
|
|
right = UnicodeToGBKTable[unicode].rightbyte ;
|
|
pGBCode->leftbyte = left & 0x7F ;
|
|
pGBCode->rightbyte = right & 0x7F ;
|
|
}
|
|
else
|
|
{
|
|
// other ones we search in GBK to Unicode table
|
|
for ( PRUint16 i=0; i<MAX_GBK_LENGTH; i++)
|
|
{
|
|
if ( unicode == GBKToUnicodeTable[i] )
|
|
{
|
|
left = (PRUint8) ( i / 0x00BF + 0x0081);
|
|
right = (PRUint8) ( i % 0x00BF+ 0x0040);
|
|
pGBCode->leftbyte = left;
|
|
pGBCode->rightbyte = right;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
nsUnicodeToHZ::nsUnicodeToHZ()
|
|
{
|
|
PRUint8 left, right;
|
|
PRUnichar unicode;
|
|
PRUnichar i;
|
|
|
|
for ( i=0; i<MAX_GBK_LENGTH; i++ )
|
|
{
|
|
|
|
left = (PRUint8) ( i / 0x00BF + 0x0081);
|
|
right = (PRUint8)( 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; // we start using table at 0x4E00
|
|
UnicodeToGBKTable[unicode].leftbyte = left;
|
|
UnicodeToGBKTable[unicode].rightbyte = right;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP nsUnicodeToHZ::ConvertNoBuff(const PRUnichar * aSrc,
|
|
PRInt32 * aSrcLength,
|
|
char * aDest,
|
|
PRInt32 * aDestLength)
|
|
{
|
|
#define HZ_STATE_GB 1
|
|
#define HZ_STATE_ASCII 2
|
|
#define HZ_STATE_TILD 3
|
|
#define HZLEAD1 '~'
|
|
#define HZLEAD2 '{'
|
|
#define HZLEAD3 '}'
|
|
#define UNICODE_TILD 0x007E
|
|
|
|
static PRUint16 hz_state = HZ_STATE_ASCII; // per HZ spec, default to HZ mode
|
|
PRInt32 i=0;
|
|
PRInt32 iSrcLength = *aSrcLength;
|
|
DByte *pDestDBCode;
|
|
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, process as a GB
|
|
|
|
if ( hz_state != HZ_STATE_GB )
|
|
{
|
|
// we are adding a '~{' ESC sequence to star a HZ string
|
|
hz_state = HZ_STATE_GB;
|
|
pDestDBCode->leftbyte = '~';
|
|
pDestDBCode->rightbyte = '{';
|
|
aDest += 2; // increment 2 bytes
|
|
pDestDBCode = (DByte *)aDest;
|
|
iDestLength +=2;
|
|
}
|
|
|
|
UnicodeToHZ( *pSrc, pDestDBCode);
|
|
aDest += 2; // increment 2 bytes
|
|
pDestDBCode = (DByte *)aDest;
|
|
iDestLength +=2;
|
|
}
|
|
else
|
|
{
|
|
// this is an ASCII
|
|
|
|
// if we are in HZ mode, end it by adding a '~}' ESC sequence
|
|
if ( hz_state == HZ_STATE_GB )
|
|
{
|
|
hz_state = HZ_STATE_ASCII;
|
|
pDestDBCode->leftbyte = '~';
|
|
pDestDBCode->rightbyte = '}';
|
|
aDest += 2; // increment 2 bytes
|
|
pDestDBCode = (DByte *)aDest;
|
|
iDestLength +=2;
|
|
}
|
|
|
|
// if this is a regular char '~' , convert it to two '~'
|
|
if ( *pSrc == UNICODE_TILD )
|
|
{
|
|
pDestDBCode->leftbyte = '~';
|
|
pDestDBCode->rightbyte = '~';
|
|
aDest += 2; // increment 2 bytes
|
|
pDestDBCode = (DByte *)aDest;
|
|
iDestLength +=2;
|
|
}
|
|
else
|
|
{
|
|
// other regular ASCII chars convert by normal ways
|
|
|
|
// Is this works for both little endian and big endian machines ?
|
|
*aDest = (char) ( (PRUnichar)(*pSrc) );
|
|
|
|
aDest++; // increment 1 byte
|
|
iDestLength +=1;
|
|
}
|
|
}
|
|
pSrc++; // increment 2 bytes
|
|
|
|
if ( iDestLength >= (*aDestLength) )
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
*aDestLength = iDestLength;
|
|
*aSrcLength = i;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
#define SET_REPRESENTABLE(info, c) (info)[(c) >> 5] |= (1L << ((c) & 0x1f))
|
|
|
|
NS_IMETHODIMP nsUnicodeToHZ::FillInfo(PRUint32 *aInfo)
|
|
{
|
|
PRUint16 i,j, k;
|
|
PRUnichar SrcUnicode;
|
|
|
|
// aInfo should already been initialized as 2048 element array of 32 bit by caller
|
|
NS_ASSERTION( sizeof(aInfo[0]) == 4, "aInfo size incorrect" );
|
|
|
|
// valid GBK rows are in 0x81 to 0xFE
|
|
for (i=0x81; i<0xFE; i++)
|
|
{
|
|
// HZ and GB2312 starts at row 0x21|0x80 = 0xA1
|
|
if ( i < 0xA1 )
|
|
continue;
|
|
|
|
// valid GBK columns are in 0x41 to 0xFE
|
|
for( j=0x41; j<0xFE; j++)
|
|
{
|
|
//HZ and GB2312 starts at col 0x21 | 0x80 = 0xA1
|
|
if ( j < 0xA1 )
|
|
continue;
|
|
|
|
// k is index in GBKU.H table
|
|
k = (i - 0x81)*(0xFE - 0x80)+(j-0x41);
|
|
|
|
SrcUnicode = GBKToUnicodeTable[i];
|
|
if (( SrcUnicode != 0xFFFF ) && (SrcUnicode != 0xFFFD) )
|
|
{
|
|
SET_REPRESENTABLE(aInfo, SrcUnicode);
|
|
}
|
|
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsUnicodeToHZ::CreateInstance(nsISupports ** aResult)
|
|
{
|
|
nsIUnicodeEncoder *p = new nsUnicodeToHZ();
|
|
if(p) {
|
|
*aResult = p;
|
|
return NS_OK;
|
|
}
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Subclassing of nsTableEncoderSupport class [implementation]
|
|
|
|
NS_IMETHODIMP nsUnicodeToHZ::GetMaxLength(const PRUnichar * aSrc,
|
|
PRInt32 aSrcLength,
|
|
PRInt32 * aDestLength)
|
|
{
|
|
*aDestLength = 6 * aSrcLength;
|
|
return NS_OK;
|
|
}
|