Back to index

lightning-sunbird  0.9+nobinonly
nsUnicodeToGB2312V2.cpp
Go to the documentation of this file.
00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Yueheng Xu, yueheng.xu@intel.com
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsUnicodeToGB2312V2.h"
00040 #include "nsICharRepresentable.h"
00041 #include "nsUCvCnDll.h"
00042 #include "gbku.h"
00043 
00044 //----------------------------------------------------------------------
00045 // Class nsUnicodeToGB2312V2 [implementation]
00046 nsUnicodeToGB2312V2::nsUnicodeToGB2312V2() :
00047   nsEncoderSupport(2)
00048 {
00049   mUtil.InitToGBKTable();
00050 }
00051 
00052 NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc, 
00053                                                  PRInt32 * aSrcLength, 
00054                                                  char * aDest, 
00055                                                  PRInt32 * aDestLength)
00056 {
00057   PRInt32 iSrcLength = 0;
00058   PRInt32 iDestLength = 0;
00059   nsresult res = NS_OK;
00060   
00061   while (iSrcLength < *aSrcLength)
00062   {
00063     //if unicode's hi byte has something, it is not ASCII, must be a GB
00064     if(IS_ASCII(*aSrc))
00065     {
00066       // this is an ASCII
00067       *aDest = CAST_UNICHAR_TO_CHAR(*aSrc);
00068       aDest++; // increment 1 byte
00069       iDestLength +=1;
00070     } else {
00071       char byte1, byte2;
00072       if(mUtil.UnicodeToGBKChar(*aSrc, PR_FALSE, &byte1, &byte2))
00073       {
00074         if(iDestLength+2 > *aDestLength) 
00075         {
00076           res = NS_OK_UENC_MOREOUTPUT;
00077           break;
00078         }
00079         aDest[0]=byte1;
00080         aDest[1]=byte2;
00081         aDest += 2;  // increment 2 bytes
00082         iDestLength +=2; // each GB char count as two in char* string
00083       } else {
00084         // cannot convert
00085         res= NS_ERROR_UENC_NOMAPPING;
00086         iSrcLength++;   // include length of the unmapped character
00087         break;
00088       }
00089     }
00090     iSrcLength++ ;   // each unicode char just count as one in PRUnichar* string
00091     aSrc++;  
00092     if ( iDestLength >= (*aDestLength) && (iSrcLength < *aSrcLength ))
00093     {
00094       res = NS_OK_UENC_MOREOUTPUT;
00095       break;
00096     }
00097   }
00098   *aDestLength = iDestLength;
00099   *aSrcLength = iSrcLength;
00100   return res;
00101 }
00102 
00103 //----------------------------------------------------------------------
00104 // Subclassing of nsTableEncoderSupport class [implementation]
00105 
00106 NS_IMETHODIMP nsUnicodeToGB2312V2::FillInfo(PRUint32 *aInfo)
00107 {
00108   mUtil.FillGB2312Info(aInfo);
00109   //GB2312 font lib also have single byte ASCII characters, set them here
00110   for ( PRUint16 u = 0x0000; u <= 0x007F; u++)
00111     SET_REPRESENTABLE(aInfo, u);
00112   return NS_OK;
00113 }