/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

//----------------------------------------------------------------------
// Global functions and data [declaration]
#include "nsUCvMinSupport.h"
#include "nsUnicodeToUTF8.h"
#include <string.h>

NS_IMETHODIMP NS_NewUnicodeToUTF8(nsISupports* aOuter, 
                                            const nsIID& aIID,
                                            void** aResult)
{
  if (!aResult) {
    return NS_ERROR_NULL_POINTER;
  }
  if (aOuter) {
    *aResult = nsnull;
    return NS_ERROR_NO_AGGREGATION;
  }
  nsUnicodeToUTF8 * inst = new nsUnicodeToUTF8();
  if (!inst) {
    *aResult = nsnull;
    return NS_ERROR_OUT_OF_MEMORY;
  }
  nsresult res = inst->QueryInterface(aIID, aResult);
  if (NS_FAILED(res)) {
    *aResult = nsnull;
    delete inst;
  }
  return res;
}


static PRUint16 g_UTF8MappingTable[] = {
  0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0xFFFF, 0x0000
};

static PRInt16 g_UTF8ShiftTable[] =  {
  3, uMultibytesCharset, 
  ShiftCell(u1ByteChar,       1, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x7F), 
  ShiftCell(u2BytesUTF8,      2, 0xC0, 0xDF, 0x00, 0x00, 0x07, 0xFF), 
  ShiftCell(u3BytesUTF8,      3, 0xE0, 0xEF, 0x08, 0x00, 0xFF, 0xFF) 
};

//----------------------------------------------------------------------
// Class nsUnicodeToUTF8 [implementation]

nsUnicodeToUTF8::nsUnicodeToUTF8() 
: nsTableEncoderSupport((uShiftTable*) &g_UTF8ShiftTable, 
                        (uMappingTable*) &g_UTF8MappingTable)
{
}

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

NS_IMETHODIMP nsUnicodeToUTF8::GetMaxLength(const PRUnichar * aSrc, 
                                              PRInt32 aSrcLength,
                                              PRInt32 * aDestLength)
{
  // in theory it should be 6, but since we do not handle 
  // UCS4 and UTF-16 here. It is 3. We should change it to 6 when we
  // support UCS4 or UTF-16
  *aDestLength = 3*aSrcLength;
  return NS_OK;
}
NS_IMETHODIMP nsUnicodeToUTF8::FillInfo(PRUint32 *aInfo)
{
  memset(aInfo, 0xFF, (0x10000L >> 3));
  return NS_OK;
}
