intl/uconv/ucvja/nsUnicodeToISO2022JP.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   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/
   9  *
  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  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either of the GNU General Public License Version 2 or later (the "GPL"),
  26  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "nsUnicodeToISO2022JP.h"
  39 #include "nsIComponentManager.h"
  40 #include "nsUCVJADll.h"
  41 #include "nsUnicodeEncodeHelper.h"
  42
  43 //----------------------------------------------------------------------
  44 // Global functions and data [declaration]
  45
  46 static const PRUint16 g_ufAsciiMapping [] = {
  47   0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0x007F, 0x0000
  48 };
  49
  50 #define SIZE_OF_TABLES 5
  51 static const PRUint16 * g_ufMappingTables[SIZE_OF_TABLES] = {
  52   g_ufAsciiMapping,             // ASCII           ISOREG 6
  53   g_uf0201GLMapping,            // JIS X 0201-1976 ISOREG 14
  54   g_uf0208Mapping,              // JIS X 0208-1983 ISOREG 87
  55   g_uf0208extMapping,           // JIS X 0208 - cp932 ext
  56   g_uf0208Mapping,              // JIS X 0208-1978 ISOREG 42
  57 };
  58
  59 static const uScanClassID g_ufScanClassIDs[SIZE_OF_TABLES] = {
  60   u1ByteCharset,                // ASCII           ISOREG 6
  61   u1ByteCharset,                // JIS X 0201-1976 ISOREG 14
  62   u2BytesCharset,               // JIS X 0208-1983 ISOREG 87
  63   u2BytesCharset,               // JIS X 0208- cp932 ext
  64   u2BytesCharset,               // JIS X 0208-1978 ISOREG 42
  65 };
  66
  67 //----------------------------------------------------------------------
  68 // Class nsUnicodeToISO2022JP [implementation]
  69
  70 // worst case max length:
  71 //  1  2 3  4  5  6  7 8
  72 // ESC $ B XX XX ESC ( B
  73 nsUnicodeToISO2022JP::nsUnicodeToISO2022JP()
  74 : nsEncoderSupport(8)
  75 {
  76   Reset();
  77 }
  78
  79 nsUnicodeToISO2022JP::~nsUnicodeToISO2022JP()
  80 {
  81 }
  82
  83 nsresult nsUnicodeToISO2022JP::ChangeCharset(PRInt32 aCharset,
  84                                              char * aDest,
  85                                              PRInt32 * aDestLength)
  86 {
  87   // both 2 and 3 generate the same escape sequence. 2 is for
  88   // the standard JISx0208 table, and 3 is for theCP932 extensions
  89   // therefore, we treat them as the same one.
  90   if(((2 == aCharset) && ( 3 == mCharset)) ||
  91      ((3 == aCharset) && ( 2 == mCharset)) )
  92   {
  93     mCharset = aCharset;
  94   }
  95
  96   if(aCharset == mCharset)
  97   {
  98     *aDestLength = 0;
  99     return NS_OK;
 100   }
 101
 102   if (*aDestLength < 3) {
 103     *aDestLength = 0;
 104     return NS_OK_UENC_MOREOUTPUT;
 105   }
 106
 107   switch (aCharset) {
 108     case 0: // ASCII ISOREG 6
 109       aDest[0] = 0x1b;
 110       aDest[1] = '(';
 111       aDest[2] = 'B';
 112       break;
 113     case 1: // JIS X 0201-1976 ("Roman" set) ISOREG 14
 114       aDest[0] = 0x1b;
 115       aDest[1] = '(';
 116       aDest[2] = 'J';
 117       break;
 118     case 2: // JIS X 0208-1983 ISOREG 87
 119     case 3: // JIS X 0208-1983
 120             // we currently use this for CP932 ext
 121       aDest[0] = 0x1b;
 122       aDest[1] = '$';
 123       aDest[2] = 'B';
 124       break;
 125     case 4: // JIS X 0201-1978 ISOREG 87-
 126             // we currently do not have a diff mapping for it.
 127       aDest[0] = 0x1b;
 128       aDest[1] = '$';
 129       aDest[2] = '@';
 130       break;
 131   }
 132
 133   mCharset = aCharset;
 134   *aDestLength = 3;
 135   return NS_OK;
 136 }
 137
 138 //----------------------------------------------------------------------
 139 // Subclassing of nsTableEncoderSupport class [implementation]
 140
 141 NS_IMETHODIMP nsUnicodeToISO2022JP::FillInfo(PRUint32* aInfo)
 142 {
 143   return nsUnicodeEncodeHelper::FillInfo(aInfo, SIZE_OF_TABLES,
 144                                          (uMappingTable **) g_ufMappingTables);
 145
 146 }
 147 NS_IMETHODIMP nsUnicodeToISO2022JP::ConvertNoBuffNoErr(
 148                                     const PRUnichar * aSrc,
 149                                     PRInt32 * aSrcLength,
 150                                     char * aDest,
 151                                     PRInt32 * aDestLength)
 152 {
 153   nsresult res = NS_OK;
 154
 155   const PRUnichar * src = aSrc;
 156   const PRUnichar * srcEnd = aSrc + *aSrcLength;
 157   char * dest = aDest;
 158   char * destEnd = aDest + *aDestLength;
 159   PRInt32 bcr, bcw;
 160   PRInt32 i;
 161
 162   while (src < srcEnd) {
 163     for (i=0; i< SIZE_OF_TABLES ; i++) {
 164       bcr = 1;
 165       bcw = destEnd - dest;
 166       res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
 167                                       g_ufScanClassIDs[i], nsnull,
 168                                       (uMappingTable *) g_ufMappingTables[i]);
 169       if (res != NS_ERROR_UENC_NOMAPPING) break;
 170     }
 171
 172     if ( i>=  SIZE_OF_TABLES) {
 173       res = NS_ERROR_UENC_NOMAPPING;
 174       src++;
 175     }
 176     if (res != NS_OK) break;
 177
 178     bcw = destEnd - dest;
 179     res = ChangeCharset(i, dest, &bcw);
 180     dest += bcw;
 181     if (res != NS_OK) break;
 182
 183     bcr = srcEnd - src;
 184     bcw = destEnd - dest;
 185     res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
 186                                       g_ufScanClassIDs[i], nsnull,
 187                                       (uMappingTable *) g_ufMappingTables[i]);
 188     src += bcr;
 189     dest += bcw;
 190
 191     if ((res != NS_OK) && (res != NS_ERROR_UENC_NOMAPPING)) break;
 192     if (res == NS_ERROR_UENC_NOMAPPING) src--;
 193   }
 194
 195   *aSrcLength = src - aSrc;
 196   *aDestLength  = dest - aDest;
 197   return res;
 198 }
 199
 200 NS_IMETHODIMP nsUnicodeToISO2022JP::FinishNoBuff(char * aDest,
 201                                                  PRInt32 * aDestLength)
 202 {
 203   ChangeCharset(0, aDest, aDestLength);
 204   return NS_OK;
 205 }
 206
 207 NS_IMETHODIMP nsUnicodeToISO2022JP::Reset()
 208 {
 209   mCharset = 0;
 210   return nsEncoderSupport::Reset();
 211 }