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205 lines
7.5 KiB
C++
205 lines
7.5 KiB
C++
/* -*- Mode: C; tab-width: 4; 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.org 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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/**
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* A character set converter from HZ 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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* Earlier versions of the converter said:
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* "In an effort to match the similar extended capability of Microsoft
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* Internet Explorer 5.0. We also accept the 8-bit GB encoded chars
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* mixed in a HZ string.
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* But this should not be a recommendedd practice for HTML authors."
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* However, testing in current versions of IE shows that it only accepts
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* 8-bit characters when the converter is in GB state, and when in ASCII
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* state each single 8-bit character is converted to U+FFFD
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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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#include "gbku.h"
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//----------------------------------------------------------------------
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// Class nsHZToUnicode [implementation]
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//----------------------------------------------------------------------
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// Subclassing of nsTablesDecoderSupport class [implementation]
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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_ODD_BYTE_FLAG 0x80
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#define HZLEAD1 '~'
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#define HZLEAD2 '{'
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#define HZLEAD3 '}'
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#define HZ_ODD_BYTE_STATE (mHZState & (HZ_STATE_ODD_BYTE_FLAG))
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#define HZ_ENCODING_STATE (mHZState & ~(HZ_STATE_ODD_BYTE_FLAG))
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nsHZToUnicode::nsHZToUnicode() : nsBufferDecoderSupport(1)
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{
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mHZState = HZ_STATE_ASCII; // per HZ spec, default to ASCII state
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mRunLength = 0;
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mOddByte = 0;
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}
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//Overwriting the ConvertNoBuff() in nsUCvCnSupport.cpp.
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NS_IMETHODIMP nsHZToUnicode::ConvertNoBuff(
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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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PRInt32 i=0;
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PRInt32 iSrcLength = *aSrcLength;
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PRInt32 iDestlen = 0;
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*aSrcLength=0;
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nsresult res = NS_OK;
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char oddByte = mOddByte;
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for (i=0; i<iSrcLength; i++) {
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if (iDestlen >= (*aDestLength)) {
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res = NS_OK_UDEC_MOREOUTPUT;
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break;
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}
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char srcByte = *aSrc++;
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(*aSrcLength)++;
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if (!HZ_ODD_BYTE_STATE) {
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if (srcByte == HZLEAD1 ||
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(HZ_ENCODING_STATE == HZ_STATE_GB &&
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(UINT8_IN_RANGE(0x21, srcByte, 0x7E) ||
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UINT8_IN_RANGE(0x81, srcByte, 0xFE)))) {
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oddByte = srcByte;
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mHZState |= HZ_STATE_ODD_BYTE_FLAG;
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} else {
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*aDest++ = (srcByte & 0x80) ? UCS2_NO_MAPPING :
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CAST_CHAR_TO_UNICHAR(srcByte);
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iDestlen++;
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}
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} else {
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if (oddByte & 0x80) {
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// Accept legal 8-bit GB 2312-80 sequences in GB mode only
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NS_ASSERTION(HZ_ENCODING_STATE == HZ_STATE_GB,
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"Invalid lead byte in ASCII mode");
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*aDest++ = (UINT8_IN_RANGE(0x81, oddByte, 0xFE) &&
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UINT8_IN_RANGE(0x40, srcByte, 0xFE)) ?
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mUtil.GBKCharToUnicode(oddByte, srcByte) : UCS2_NO_MAPPING;
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mRunLength++;
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iDestlen++;
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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 oddByte
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} else if (oddByte == HZLEAD1) { // if it is lead by '~'
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switch (srcByte) {
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case HZLEAD2:
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// we got a '~{'
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// we are switching to HZ state
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mHZState = HZ_STATE_GB;
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mRunLength = 0;
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break;
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case HZLEAD3:
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// we got a '~}'
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// we are switching to ASCII state
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mHZState = HZ_STATE_ASCII;
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if (mRunLength == 0) {
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*aDest++ = UCS2_NO_MAPPING;
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iDestlen++;
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}
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mRunLength = 0;
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break;
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case HZLEAD1:
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// we got a '~~', process like an ASCII, but no state change
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*aDest++ = CAST_CHAR_TO_UNICHAR(srcByte);
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iDestlen++;
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mRunLength++;
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break;
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default:
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// Undefined ESC sequence '~X': treat as an error if X is a
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// printable character or we are in ASCII mode, and resynchronize
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// on the second character.
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//
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// N.B. For compatibility with other implementations, we treat '~\n'
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// as an illegal sequence even though RFC1843 permits it, and for
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// the same reason we pass through control characters including '\n'
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// and ' ' even in GB mode.
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if (srcByte > 0x20 || HZ_ENCODING_STATE == HZ_STATE_ASCII) {
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*aDest++ = UCS2_NO_MAPPING;
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}
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aSrc--;
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(*aSrcLength)--;
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iDestlen++;
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break;
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}
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} else if (HZ_ENCODING_STATE == HZ_STATE_GB) {
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*aDest++ = (UINT8_IN_RANGE(0x21, oddByte, 0x7E) &&
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UINT8_IN_RANGE(0x21, srcByte, 0x7E)) ?
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mUtil.GBKCharToUnicode(oddByte|0x80, srcByte|0x80) :
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UCS2_NO_MAPPING;
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mRunLength++;
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iDestlen++;
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} else {
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NS_NOTREACHED("2-byte sequence that we don't know how to handle");
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*aDest++ = UCS2_NO_MAPPING;
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iDestlen++;
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}
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oddByte = 0;
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mHZState &= ~HZ_STATE_ODD_BYTE_FLAG;
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}
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} // for loop
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mOddByte = HZ_ODD_BYTE_STATE ? oddByte : 0;
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*aDestLength = iDestlen;
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return res;
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}
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