96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsGBKConvUtil.h"
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#include "gbku.h"
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#include "nsDebug.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 const char16_t gGBKToUnicodeTable[MAX_GBK_LENGTH] = {
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#include "cp936map.h"
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};
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static const uint16_t gUnicodeToGBKTable[0xA000-0x4e00] = {
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#include "cp936invmap.h"
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};
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bool nsGBKConvUtil::UnicodeToGBKChar(
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char16_t aChar, bool aToGL, char*
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aOutByte1, char* aOutByte2)
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{
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bool found=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 false;
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}
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if(UNICHAR_IN_RANGE(0x4e00, aChar, 0x9FFF))
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{
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uint16_t 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 = true;
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} else {
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return false;
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}
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} else if (aChar == UCS2_NO_MAPPING) {
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return false;
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} else {
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// ugly linear search
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for( int32_t 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 = 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 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 false;
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}
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}
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return true;
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}
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char16_t 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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uint8_t i1 = (uint8_t)aByte1;
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uint8_t i2 = (uint8_t)aByte2;
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uint16_t 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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