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lightning-sunbird  0.9+nobinonly
nsUnicodeToGB2312GL.cpp
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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 "nsICharRepresentable.h"
00040 #include "nsUnicodeToGB2312GL.h"
00041 #include "nsUCvCnDll.h"
00042 
00043 #include "gbku.h"
00044 
00045 //----------------------------------------------------------------------
00046 // Class nsUnicodeToGB2312GL [implementation]
00047 
00048 nsUnicodeToGB2312GL::nsUnicodeToGB2312GL() :
00049   nsEncoderSupport(2)
00050 {
00051   mUtil.InitToGBKTable();
00052 }
00053 
00054 NS_IMETHODIMP nsUnicodeToGB2312GL::ConvertNoBuff(const PRUnichar * aSrc, 
00055                                                  PRInt32 * aSrcLength, 
00056                                                  char * aDest, 
00057                                                  PRInt32 * aDestLength)
00058 {
00059   PRInt32 iSrcLength = 0;
00060   PRInt32 iDestLength = 0;
00061   nsresult res = NS_OK;
00062   while( iSrcLength < *aSrcLength)
00063   {
00064     char byte1, byte2;
00065     if(mUtil.UnicodeToGBKChar(*aSrc, PR_TRUE, &byte1,&byte2))
00066     {
00067       if(iDestLength+2 > *aDestLength)
00068       {
00069         res = NS_OK_UENC_MOREOUTPUT;
00070         break;
00071       }
00072       aDest[0]=byte1;
00073       aDest[1]=byte2;
00074       aDest += 2;    // increment 2 bytes
00075       iDestLength +=2; // Dest Length in units of chars, each GB char counts as two in string length
00076     } else {
00077       // cannot map
00078       res = NS_ERROR_UENC_NOMAPPING;
00079       break; 
00080     }
00081     iSrcLength++ ; // Each unicode char just count as one in PRUnichar string;  
00082     aSrc++; 
00083     // if dest buffer not big enough, handles it here. 
00084     if ( (iDestLength >= *aDestLength) && ( iSrcLength < *aSrcLength) )
00085     {
00086       res = NS_OK_UENC_MOREOUTPUT;
00087       break;
00088     }
00089   }
00090   *aDestLength = iDestLength;
00091   *aSrcLength = iSrcLength;
00092   return res;
00093 }
00094 
00095 //----------------------------------------------------------------------
00096 // Subclassing of nsTableEncoderSupport class [implementation]
00097 
00098 NS_IMETHODIMP nsUnicodeToGB2312GL::FillInfo(PRUint32 *aInfo)
00099 {
00100   mUtil.FillGB2312Info(aInfo);
00101   return NS_OK;
00102 }