pjs/intl/uconv/ucvlatin/nsUCS4BEToUnicode.cpp

/* -*- Mode: C++; tab-width: 2; 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 Communicator client 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 ***** */

#include "nsUCS4BEToUnicode.h"

//----------------------------------------------------------------------
// Global functions and data [declaration]

static const PRUint16 g_UCS4BEMappingTable[] = {
  0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0xFFFF, 0x0000
};

static const PRInt16 g_UCS4BEShiftTable[] =  {
  0, u4BytesCharset, 
  ShiftCell(0,       0, 0, 0, 0, 0, 0, 0), 
};

//----------------------------------------------------------------------
// Class nsUCS4BEToUnicode [implementation]

nsUCS4BEToUnicode::nsUCS4BEToUnicode() 
: nsTableDecoderSupport((uShiftTable*) &g_UCS4BEShiftTable, 
                        (uMappingTable*) &g_UCS4BEMappingTable)
{
}

nsresult nsUCS4BEToUnicode::CreateInstance(nsISupports ** aResult) 
{
  *aResult = new nsUCS4BEToUnicode();
  return (*aResult == NULL)? NS_ERROR_OUT_OF_MEMORY : NS_OK;
}

//----------------------------------------------------------------------
// Subclassing of nsTableDecoderSupport class [implementation]

NS_IMETHODIMP nsUCS4BEToUnicode::GetMaxLength(const char * aSrc, 
                                            PRInt32 aSrcLength, 
                                            PRInt32 * aDestLength)
{
  if(0 == (aSrcLength % 4)) 
  {
    *aDestLength = aSrcLength / 4;
    return NS_OK_UENC_EXACTLENGTH;
  } else {
    *aDestLength = (aSrcLength / 4) + 1;
    return NS_OK;
  }
}