/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: NPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Netscape Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/NPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the NPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the NPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /** * A character set converter from HZ to Unicode. * * * @created 08/Sept/1999 * @author Yueheng Xu, Yueheng.Xu@intel.com * * Note: in this HZ-GB-2312 converter, we accept a string composed of 7-bit HZ * encoded Chinese chars,as it is defined in RFC1843 available at * http://www.cis.ohio-state.edu/htbin/rfc/rfc1843.html * and RFC1842 available at http://www.cis.ohio-state.edu/htbin/rfc/rfc1842.html. * * In an effort to match the similar extended capability of Microsoft Internet Explorer * 5.0. We also accept the 8-bit GB encoded chars mixed in a HZ string. * But this should not be a recommendedd practice for HTML authors. * * The priority of converting are as follows: first convert 8-bit GB code; then, * consume HZ ESC sequences such as '~{', '~}', '~~'; then, depending on the current * state ( default to ASCII state ) of the string, each 7-bit char is converted as an * ASCII, or two 7-bit chars are converted into a Chinese character. */ #include "nsUCvCnDll.h" #include "nsHZToUnicode.h" #include "gbku.h" //---------------------------------------------------------------------- // Class nsHZToUnicode [implementation] //---------------------------------------------------------------------- // Subclassing of nsTablesDecoderSupport class [implementation] NS_IMETHODIMP nsHZToUnicode::GetMaxLength(const char * aSrc, PRInt32 aSrcLength, PRInt32 * aDestLength) { *aDestLength = aSrcLength; return NS_OK; } #define HZ_STATE_GB 1 #define HZ_STATE_ASCII 2 #define HZ_STATE_TILD 3 #define HZLEAD1 '~' #define HZLEAD2 '{' #define HZLEAD3 '}' #define HZLEAD4 '\n' nsHZToUnicode::nsHZToUnicode() { mHZState = HZ_STATE_ASCII; // per HZ spec, default to ASCII state } //Overwriting the ConvertNoBuff() in nsUCvCnSupport.cpp. NS_IMETHODIMP nsHZToUnicode::ConvertNoBuff( const char* aSrc, PRInt32 * aSrcLength, PRUnichar *aDest, PRInt32 * aDestLength) { PRInt32 i=0; PRInt32 iSrcLength = *aSrcLength; PRInt32 iDestlen = 0; PRUint8 ch1, ch2; nsresult res = NS_OK; *aSrcLength=0; for (i=0;i= (*aDestLength) ) { res = NS_OK_UDEC_MOREOUTPUT; break; } if ( *aSrc & 0x80 ) // if it is a 8-bit byte { // The source is a 8-bit GBCode *aDest = mUtil.GBKCharToUnicode(aSrc[0], aSrc[1]); aSrc += 2; i++; iDestlen++; aDest++; *aSrcLength = i+1; continue; } // otherwise, it is a 7-bit byte // The source will be an ASCII or a 7-bit HZ code depending on ch1 ch1 = *aSrc; ch2 = *(aSrc+1); if (ch1 == HZLEAD1 ) // if it is lead by '~' { switch (ch2) { case HZLEAD2: // we got a '~{' // we are switching to HZ state mHZState = HZ_STATE_GB; aSrc += 2; i++; break; case HZLEAD3: // we got a '~}' // we are switching to ASCII state mHZState = HZ_STATE_ASCII; aSrc += 2; i++; break; case HZLEAD1: // we got a '~~', process like an ASCII, but no state change aSrc++; *aDest = CAST_CHAR_TO_UNICHAR(*aSrc); aSrc++; i++; iDestlen++; aDest++; break; case HZLEAD4: // we got a "~\n", it means maintain double byte mode cross lines, ignore the '~' itself // mHZState = HZ_STATE_GB; // I find that "~\n" should interpreted as line continuation without mode change // It should not be interpreted as line continuation with double byte mode on aSrc++; break; default: // undefined ESC sequence '~X' are ignored since this is a illegal combination aSrc += 2; break; }; continue;// go for next loop } // ch1 != '~' switch (mHZState) { case HZ_STATE_GB: // the following chars are HZ *aDest = mUtil.GBKCharToUnicode(aSrc[0]|0x80, aSrc[1]|0x80); aSrc += 2; i++; iDestlen++; aDest++; break; case HZ_STATE_ASCII: default: // default behavior also like an ASCII // when the source is an ASCII *aDest = CAST_CHAR_TO_UNICHAR(*aSrc); aSrc++; iDestlen++; aDest++; break; } *aSrcLength = i+1; }// for loop *aDestLength = iDestlen; return NS_OK; }