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https://github.com/classilla/tenfourfox.git
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240 lines
7.6 KiB
C++
240 lines
7.6 KiB
C++
/* -*- Mode: C; tab-width: 4; 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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/**
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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 07/Sept/1999
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* @author Yueheng Xu, Yueheng.Xu@intel.com
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*/
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#include "nsGBKToUnicode.h"
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#include "gbku.h"
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#include "nsUnicodeDecodeHelper.h"
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static const uint16_t g_utGB18030Unique2Bytes[] = {
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#include "gb18030uniq2b.ut"
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};
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static const uint16_t g_utGB18030Unique4Bytes[] = {
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#include "gb180304bytes.ut"
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};
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//----------------------------------------------------------------------
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// Class nsGB18030ToUnicode [implementation]
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//----------------------------------------------------------------------
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// Subclassing of nsBufferDecoderSupport class [implementation]
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#define LEGAL_GBK_MULTIBYTE_FIRST_BYTE(c) \
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(UINT8_IN_RANGE(0x81, (c), 0xFE))
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#define FIRST_BYTE_IS_SURROGATE(c) \
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(UINT8_IN_RANGE(0x90, (c), 0xFE))
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#define LEGAL_GBK_2BYTE_SECOND_BYTE(c) \
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(UINT8_IN_RANGE(0x40, (c), 0x7E)|| UINT8_IN_RANGE(0x80, (c), 0xFE))
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#define LEGAL_GBK_4BYTE_SECOND_BYTE(c) \
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(UINT8_IN_RANGE(0x30, (c), 0x39))
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#define LEGAL_GBK_4BYTE_THIRD_BYTE(c) \
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(UINT8_IN_RANGE(0x81, (c), 0xFE))
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#define LEGAL_GBK_4BYTE_FORTH_BYTE(c) \
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(UINT8_IN_RANGE(0x30, (c), 0x39))
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NS_IMETHODIMP nsGB18030ToUnicode::ConvertNoBuff(const char* aSrc,
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int32_t * aSrcLength,
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char16_t *aDest,
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int32_t * aDestLength)
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{
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int32_t i=0;
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int32_t iSrcLength = (*aSrcLength);
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int32_t iDestlen = 0;
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nsresult rv=NS_OK;
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*aSrcLength = 0;
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for (i=0;i<iSrcLength;i++)
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{
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if ( iDestlen >= (*aDestLength) )
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{
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rv = NS_OK_UDEC_MOREOUTPUT;
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break;
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}
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// The valid range for the 1st byte is [0x81,0xFE]
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if(LEGAL_GBK_MULTIBYTE_FIRST_BYTE(*aSrc))
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{
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if(i+1 >= iSrcLength)
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{
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rv = NS_OK_UDEC_MOREINPUT;
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break;
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}
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// To make sure, the second byte has to be checked as well.
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// In GBK, the second byte range is [0x40,0x7E] and [0x80,0XFE]
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if(LEGAL_GBK_2BYTE_SECOND_BYTE(aSrc[1]))
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{
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// Valid GBK code
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*aDest = mUtil.GBKCharToUnicode(aSrc[0], aSrc[1]);
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if(UCS2_NO_MAPPING == *aDest)
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{
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// We cannot map in the common mapping, let's call the
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// delegate 2 byte decoder to decode the gbk or gb18030 unique
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// 2 byte mapping
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if(! TryExtensionDecoder(aSrc, aDest))
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{
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*aDest = UCS2_NO_MAPPING;
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}
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}
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aSrc += 2;
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i++;
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}
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else if (LEGAL_GBK_4BYTE_SECOND_BYTE(aSrc[1]))
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{
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// from the first 2 bytes, it looks like a 4 byte GB18030
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if(i+3 >= iSrcLength) // make sure we got 4 bytes
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{
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rv = NS_OK_UDEC_MOREINPUT;
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break;
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}
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// 4 bytes patten
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// [0x81-0xfe][0x30-0x39][0x81-0xfe][0x30-0x39]
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// preset the
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if (LEGAL_GBK_4BYTE_THIRD_BYTE(aSrc[2]) &&
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LEGAL_GBK_4BYTE_FORTH_BYTE(aSrc[3]))
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{
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if ( ! FIRST_BYTE_IS_SURROGATE(aSrc[0]))
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{
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// let's call the delegated 4 byte gb18030 converter to convert it
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if(! Try4BytesDecoder(aSrc, aDest))
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*aDest = UCS2_NO_MAPPING;
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} else {
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// let's try supplement mapping
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if ( (iDestlen+1) < (*aDestLength) )
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{
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if(DecodeToSurrogate(aSrc, aDest))
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{
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// surrogte two char16_t
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iDestlen++;
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aDest++;
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} else {
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*aDest = UCS2_NO_MAPPING;
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}
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} else {
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if (*aDestLength < 2) {
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NS_ERROR("insufficient space in output buffer");
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*aDest = UCS2_NO_MAPPING;
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} else {
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rv = NS_OK_UDEC_MOREOUTPUT;
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break;
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}
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}
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}
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aSrc += 4;
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i += 3;
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} else {
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*aDest = UCS2_NO_MAPPING;
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// If the third and fourth bytes are not in the legal ranges for
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// a four-byte sequnce, resynchronize on the second byte
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// (which we know is in the range of LEGAL_GBK_4BYTE_SECOND_BYTE,
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// 0x30-0x39)
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aSrc++;
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}
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}
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else if ((uint8_t) aSrc[0] == (uint8_t)0xA0 )
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{
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// stand-alone (not followed by a valid second byte) 0xA0 !
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// treat it as valid a la Netscape 4.x
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*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
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aSrc++;
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} else {
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// Invalid GBK code point (second byte should be 0x40 or higher)
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*aDest = UCS2_NO_MAPPING;
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aSrc++;
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}
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} else {
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if(IS_ASCII(*aSrc))
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{
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// The source is an ASCII
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*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
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aSrc++;
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} else {
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if(IS_GBK_EURO(*aSrc)) {
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*aDest = UCS2_EURO;
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} else {
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*aDest = UCS2_NO_MAPPING;
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}
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aSrc++;
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}
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}
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iDestlen++;
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aDest++;
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*aSrcLength = i+1;
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}
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*aDestLength = iDestlen;
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return rv;
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}
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bool nsGB18030ToUnicode::DecodeToSurrogate(const char* aSrc, char16_t* aOut)
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{
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NS_ASSERTION(FIRST_BYTE_IS_SURROGATE(aSrc[0]), "illegal first byte");
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NS_ASSERTION(LEGAL_GBK_4BYTE_SECOND_BYTE(aSrc[1]), "illegal second byte");
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NS_ASSERTION(LEGAL_GBK_4BYTE_THIRD_BYTE(aSrc[2]), "illegal third byte");
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NS_ASSERTION(LEGAL_GBK_4BYTE_FORTH_BYTE(aSrc[3]), "illegal forth byte");
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if(! FIRST_BYTE_IS_SURROGATE(aSrc[0]))
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return false;
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if(! LEGAL_GBK_4BYTE_SECOND_BYTE(aSrc[1]))
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return false;
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if(! LEGAL_GBK_4BYTE_THIRD_BYTE(aSrc[2]))
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return false;
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if(! LEGAL_GBK_4BYTE_FORTH_BYTE(aSrc[3]))
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return false;
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uint8_t a1 = (uint8_t) aSrc[0];
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uint8_t a2 = (uint8_t) aSrc[1];
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uint8_t a3 = (uint8_t) aSrc[2];
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uint8_t a4 = (uint8_t) aSrc[3];
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a1 -= (uint8_t)0x90;
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a2 -= (uint8_t)0x30;
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a3 -= (uint8_t)0x81;
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a4 -= (uint8_t)0x30;
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uint32_t idx = (((a1 * 10 + a2 ) * 126 + a3) * 10) + a4;
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// idx == ucs4Codepoint - 0x10000
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if (idx > 0x000FFFFF)
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return false;
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*aOut++ = 0xD800 | (idx >> 10);
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*aOut = 0xDC00 | (0x000003FF & idx);
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return true;
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}
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bool nsGB18030ToUnicode::TryExtensionDecoder(const char* aSrc, char16_t* aOut)
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{
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int32_t len = 2;
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int32_t dstlen = 1;
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nsresult res =
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nsUnicodeDecodeHelper::ConvertByTable(aSrc, &len, aOut, &dstlen,
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u2BytesCharset, nullptr,
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(uMappingTable*) &g_utGB18030Unique2Bytes,
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false);
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NS_ASSERTION(NS_FAILED(res) || ((len==2) && (dstlen == 1)),
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"some strange conversion result");
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// if we failed, we then just use the 0xfffd
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// therefore, we ignore the res here.
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return NS_SUCCEEDED(res);
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}
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bool nsGB18030ToUnicode::Try4BytesDecoder(const char* aSrc, char16_t* aOut)
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{
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int32_t len = 4;
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int32_t dstlen = 1;
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nsresult res =
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nsUnicodeDecodeHelper::ConvertByTable(aSrc, &len, aOut, &dstlen,
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u4BytesGB18030Charset, nullptr,
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(uMappingTable*) &g_utGB18030Unique4Bytes,
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false);
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NS_ASSERTION(NS_FAILED(res) || ((len==4) && (dstlen == 1)),
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"some strange conversion result");
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// if we failed, we then just use the 0xfffd
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// therefore, we ignore the res here.
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return NS_SUCCEEDED(res);
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}
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