intl/uconv/ucvcn/nsUnicodeToGB2312V2.cpp

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   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla Communicator client code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Yueheng Xu, yueheng.xu@intel.com
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsUnicodeToGB2312V2.h"
  40 #include "nsICharRepresentable.h"
  41 #include "nsUCvCnDll.h"
  42 #include "gbku.h"
  43
  44 //----------------------------------------------------------------------
  45 // Class nsUnicodeToGB2312V2 [implementation]
  46 nsUnicodeToGB2312V2::nsUnicodeToGB2312V2() :
  47   nsEncoderSupport(2)
  48 {
  49   mUtil.InitToGBKTable();
  50 }
  51
  52 NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc,
  53                                                  PRInt32 * aSrcLength,
  54                                                  char * aDest,
  55                                                  PRInt32 * aDestLength)
  56 {
  57   PRInt32 iSrcLength = 0;
  58   PRInt32 iDestLength = 0;
  59   nsresult res = NS_OK;
  60
  61   while (iSrcLength < *aSrcLength)
  62   {
  63     //if unicode's hi byte has something, it is not ASCII, must be a GB
  64     if(IS_ASCII(*aSrc))
  65     {
  66       // this is an ASCII
  67       *aDest = CAST_UNICHAR_TO_CHAR(*aSrc);
  68       aDest++; // increment 1 byte
  69       iDestLength +=1;
  70     } else {
  71       char byte1, byte2;
  72       if(mUtil.UnicodeToGBKChar(*aSrc, PR_FALSE, &byte1, &byte2))
  73       {
  74         if(iDestLength+2 > *aDestLength)
  75         {
  76           res = NS_OK_UENC_MOREOUTPUT;
  77           break;
  78         }
  79         aDest[0]=byte1;
  80         aDest[1]=byte2;
  81         aDest += 2;  // increment 2 bytes
  82         iDestLength +=2; // each GB char count as two in char* string
  83       } else {
  84         // cannot convert
  85         res= NS_ERROR_UENC_NOMAPPING;
  86         iSrcLength++;   // include length of the unmapped character
  87         break;
  88       }
  89     }
  90     iSrcLength++ ;   // each unicode char just count as one in PRUnichar* string
  91     aSrc++;
  92     if ( iDestLength >= (*aDestLength) && (iSrcLength < *aSrcLength ))
  93     {
  94       res = NS_OK_UENC_MOREOUTPUT;
  95       break;
  96     }
  97   }
  98   *aDestLength = iDestLength;
  99   *aSrcLength = iSrcLength;
 100   return res;
 101 }
 102
 103 //----------------------------------------------------------------------
 104 // Subclassing of nsTableEncoderSupport class [implementation]
 105
 106 NS_IMETHODIMP nsUnicodeToGB2312V2::FillInfo(PRUint32 *aInfo)
 107 {
 108   mUtil.FillGB2312Info(aInfo);
 109   //GB2312 font lib also have single byte ASCII characters, set them here
 110   for ( PRUint16 u = 0x0000; u <= 0x007F; u++)
 111     SET_REPRESENTABLE(aInfo, u);
 112   return NS_OK;
 113 }