mirror of
https://github.com/rn10950/RetroZilla.git
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205 lines
6.5 KiB
C++
205 lines
6.5 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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* In an effort to match the similar extended capability of Microsoft Internet Explorer
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* 5.0. We also accept the 8-bit GB encoded chars mixed in a HZ string.
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* But this should not be a recommendedd practice for HTML authors.
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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_TILD 3
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#define HZLEAD1 '~'
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#define HZLEAD2 '{'
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#define HZLEAD3 '}'
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#define HZLEAD4 '\n'
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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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}
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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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PRUint8 ch1, ch2;
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nsresult res = 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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res = NS_OK_UDEC_MOREOUTPUT;
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break;
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}
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if ( *aSrc & 0x80 ) // if it is a 8-bit byte
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{
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if (UINT8_IN_RANGE(0x81, aSrc[0], 0xFE) &&
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UINT8_IN_RANGE(0x40, aSrc[1], 0xFE)) {
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// The source is a 8-bit GBCode
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*aDest = mUtil.GBKCharToUnicode(aSrc[0], aSrc[1]);
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} else {
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*aDest = UCS2_NO_MAPPING;
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}
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aSrc += 2;
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i++;
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iDestlen++;
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aDest++;
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*aSrcLength = i+1;
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continue;
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}
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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 ch1
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ch1 = *aSrc;
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ch2 = *(aSrc+1);
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if (ch1 == HZLEAD1 ) // if it is lead by '~'
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{
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switch (ch2)
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{
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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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aSrc += 2;
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i++;
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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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aSrc += 2;
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i++;
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if (mRunLength == 0) {
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*aDest = UCS2_NO_MAPPING;
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iDestlen++;
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aDest++;
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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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aSrc++;
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*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
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aSrc++;
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i++;
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iDestlen++;
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aDest++;
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mRunLength++;
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break;
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case HZLEAD4:
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// we got a "~\n", it means maintain double byte mode cross lines, ignore the '~' itself
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// mHZState = HZ_STATE_GB;
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// I find that "~\n" should interpreted as line continuation without mode change
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// It should not be interpreted as line continuation with double byte mode on
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aSrc++;
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break;
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default:
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// undefined ESC sequence '~X' are ignored since this is a illegal combination
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aSrc += 2;
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*aDest = UCS2_NO_MAPPING;
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iDestlen++;
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aDest++;
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break;
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};
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continue;// go for next loop
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}
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// ch1 != '~'
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switch (mHZState)
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{
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case HZ_STATE_GB:
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// the following chars are HZ
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*aDest = mUtil.GBKCharToUnicode(aSrc[0]|0x80, aSrc[1]|0x80);
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aSrc += 2;
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i++;
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iDestlen++;
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aDest++;
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mRunLength++;
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break;
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case HZ_STATE_ASCII:
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default:
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// default behavior also like an ASCII
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// when the source is an ASCII
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*aDest = CAST_CHAR_TO_UNICHAR(*aSrc);
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aSrc++;
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iDestlen++;
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aDest++;
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break;
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}
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*aSrcLength = i+1;
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}// for loop
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*aDestLength = iDestlen;
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return NS_OK;
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}
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