mirror of
https://github.com/rn10950/RetroZilla.git
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216 lines
7.2 KiB
C++
216 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsGBKConvUtil.h"
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#include "gbku.h"
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#include "nsCRT.h"
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#include "nsICharRepresentable.h"
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#define MAX_GBK_LENGTH 24066 /* (0xfe-0x80)*(0xfe-0x3f) */
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//--------------------------------------------------------------------
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// nsGBKConvUtil
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//--------------------------------------------------------------------
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static PRBool gInitToGBKTable = PR_FALSE;
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static const PRUnichar gGBKToUnicodeTable[MAX_GBK_LENGTH] = {
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#include "cp936map.h"
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};
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static PRUint16 gUnicodeToGBKTable[0xA000-0x4e00];
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PRBool nsGBKConvUtil::UnicodeToGBKChar(
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PRUnichar aChar, PRBool aToGL, char*
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aOutByte1, char* aOutByte2)
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{
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NS_ASSERTION(gInitToGBKTable, "gGBKToUnicodeTable is not init yet. need to call InitToGBKTable first");
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PRBool found=PR_FALSE;
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*aOutByte1 = *aOutByte2 = 0;
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if(UNICHAR_IN_RANGE(0xd800, aChar, 0xdfff))
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{
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// surrogate is not in here
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return PR_FALSE;
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}
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if(UNICHAR_IN_RANGE(0x4e00, aChar, 0x9FFF))
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{
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PRUint16 item = gUnicodeToGBKTable[aChar - 0x4e00];
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if(item != 0)
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{
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*aOutByte1 = item >> 8;
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*aOutByte2 = item & 0x00FF;
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found = PR_TRUE;
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} else {
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return PR_FALSE;
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}
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} else {
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// ugly linear search
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for( PRInt32 i = 0; i < MAX_GBK_LENGTH; i++ )
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{
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if( aChar == gGBKToUnicodeTable[i])
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{
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*aOutByte1 = (i / 0x00BF + 0x0081) ;
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*aOutByte2 = (i % 0x00BF + 0x0040) ;
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found = PR_TRUE;
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break;
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}
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}
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}
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if(! found)
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return PR_FALSE;
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if(aToGL) {
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// to GL, we only return if it is in the range
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if(UINT8_IN_RANGE(0xA1, *aOutByte1, 0xFE) &&
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UINT8_IN_RANGE(0xA1, *aOutByte2, 0xFE))
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{
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// mask them to GL
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*aOutByte1 &= 0x7F;
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*aOutByte2 &= 0x7F;
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} else {
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// if it does not fit into 0xa1-0xfe 0xa1-0xfe range that mean
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// it is not a GB2312 character, we cannot map to GL
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*aOutByte1 = 0x00;
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*aOutByte2 = 0x00;
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return PR_FALSE;
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}
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}
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return PR_TRUE;
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}
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PRUnichar nsGBKConvUtil::GBKCharToUnicode(char aByte1, char aByte2)
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{
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NS_ASSERTION(UINT8_IN_RANGE(0x81,aByte1, 0xFE), "first byte out of range");
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NS_ASSERTION(UINT8_IN_RANGE(0x40,aByte2, 0xFE), "second byte out of range");
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PRUint8 i1 = (PRUint8)aByte1;
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PRUint8 i2 = (PRUint8)aByte2;
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PRUint16 idx = (i1 - 0x0081) * 0x00bf + i2 - 0x0040 ;
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NS_ASSERTION(idx < MAX_GBK_LENGTH, "ARB");
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// play it safe- add if statement here ot protect ARB
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// probably not necessary
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if(idx < MAX_GBK_LENGTH)
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return gGBKToUnicodeTable[ idx ];
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else
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return UCS2_NO_MAPPING;
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}
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void nsGBKConvUtil::InitToGBKTable()
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{
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if ( gInitToGBKTable )
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return;
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PRUnichar unicode;
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PRUnichar i;
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// zap it to zero first
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memset(gUnicodeToGBKTable,0, sizeof(gUnicodeToGBKTable));
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for ( i=0; i<MAX_GBK_LENGTH; i++ )
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{
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unicode = gGBKToUnicodeTable[i];
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// to reduce size of gUnicodeToGBKTable, 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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// gGBKToUnicodeTable. There is a trade off between memory usage and speed.
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if(UNICHAR_IN_RANGE(0x4e00, unicode, 0x9fff))
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{
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unicode -= 0x4E00;
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gUnicodeToGBKTable[unicode] = (( i / 0x00BF + 0x0081) << 8) |
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( i % 0x00BF+ 0x0040);
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}
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}
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gInitToGBKTable = PR_TRUE;
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}
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void nsGBKConvUtil::FillInfo(
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PRUint32 *aInfo,
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PRUint8 aStart1, PRUint8 aEnd1,
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PRUint8 aStart2, PRUint8 aEnd2
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)
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{
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PRUint16 i,j, k;
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PRUnichar unicode;
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for ( i=aStart1; i<=aEnd1; i++)
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{
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for( j=aStart2; j<=aEnd2; j++)
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{
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k = (i - 0x0081)*0x00BF +(j-0x0040);
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unicode = gGBKToUnicodeTable[k];
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NS_ASSERTION(unicode != 0xFFFF, "somehow the table still use 0xffff");
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if (unicode != UCS2_NO_MAPPING)
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{
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SET_REPRESENTABLE(aInfo, unicode);
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}
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}
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}
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}
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void nsGBKConvUtil::FillGB2312Info(
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PRUint32 *aInfo
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)
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{
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// The following range is coded by looking at the GB2312 standard
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// and make sure we do not call FillInfo for undefined code point
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// Symbol
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// row 1 - 1 range (full)
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FillInfo(aInfo, 0x21|0x80, 0x21|0x80, 0x21|0x80, 0x7E|0x80);
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// row 2 - 3 range
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FillInfo(aInfo, 0x22|0x80, 0x22|0x80, (0x20+17)|0x80, (0x20+66)|0x80);
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FillInfo(aInfo, 0x22|0x80, 0x22|0x80, (0x20+69)|0x80, (0x20+78)|0x80);
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FillInfo(aInfo, 0x22|0x80, 0x22|0x80, (0x20+81)|0x80, (0x20+92)|0x80);
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// row 3 - 1 range (full)
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FillInfo(aInfo, 0x23|0x80, 0x23|0x80, 0x21|0x80, 0x7E|0x80);
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// row 4 - 1 range
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FillInfo(aInfo, 0x24|0x80, 0x24|0x80, (0x20+ 1)|0x80, (0x20+83)|0x80);
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// row 5 - 1 range
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FillInfo(aInfo, 0x25|0x80, 0x25|0x80, (0x20+ 1)|0x80, (0x20+86)|0x80);
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// row 6 - 2 range
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FillInfo(aInfo, 0x26|0x80, 0x26|0x80, (0x20+ 1)|0x80, (0x20+24)|0x80);
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FillInfo(aInfo, 0x26|0x80, 0x26|0x80, (0x20+33)|0x80, (0x20+56)|0x80);
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// row 7
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FillInfo(aInfo, 0x27|0x80, 0x27|0x80, (0x20+ 1)|0x80, (0x20+33)|0x80);
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FillInfo(aInfo, 0x27|0x80, 0x27|0x80, (0x20+49)|0x80, (0x20+81)|0x80);
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// row 8
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FillInfo(aInfo, 0x28|0x80, 0x28|0x80, (0x20+ 1)|0x80, (0x20+26)|0x80);
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FillInfo(aInfo, 0x28|0x80, 0x28|0x80, (0x20+36)|0x80, (0x20+73)|0x80);
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// row 9
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FillInfo(aInfo, 0x29|0x80, 0x29|0x80, (0x20+ 4)|0x80, (0x20+79)|0x80);
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// Frequent used Hanzi
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// 3021-567e
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FillInfo(aInfo, 0x30|0x80, 0x56|0x80, 0x21|0x80, 0x7E|0x80);
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// 5721-5779
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FillInfo(aInfo, 0x57|0x80, 0x57|0x80, 0x21|0x80, 0x79|0x80);
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// Infrequent used Hanzi
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// 5821-777e
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FillInfo(aInfo, 0x58|0x80, 0x77|0x80, 0x21|0x80, 0x7E|0x80);
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}
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