/* -*- Mode: C; tab-width: 4; 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.org 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 "nsEscCharsetProber.h"

nsEscCharSetProber::nsEscCharSetProber(void)
{
  mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
  mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
  mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
  mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mState = eDetecting;
  mDetectedCharset = nsnull;
}

nsEscCharSetProber::~nsEscCharSetProber(void)
{
  for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    delete mCodingSM[i];
}

void nsEscCharSetProber::Reset(void)
{
  mState = eDetecting;
  for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    mCodingSM[i]->Reset();
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mDetectedCharset = nsnull;
}

nsProbingState nsEscCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
{
  nsSMState codingState;
  PRInt32 j;
  PRUint32 i;

  for ( i = 0; i < aLen && mState == eDetecting; i++)
  {
    for (j = mActiveSM-1; j>= 0; j--)
    {
      //byte is feed to all active state machine 
      codingState = mCodingSM[j]->NextState(aBuf[i]);
      if (codingState == eError)
      {
        //got negative answer for this state machine, make it inactive
        mActiveSM--;
        if (mActiveSM == 0)
        {
          mState = eNotMe;
          return mState;
        }
        else if (j != (PRInt32)mActiveSM)
        {
          nsCodingStateMachine* t;
          t = mCodingSM[mActiveSM];
          mCodingSM[mActiveSM] = mCodingSM[j];
          mCodingSM[j] = t;
        }
      }
      else if (codingState == eItsMe)
      {
        mState = eFoundIt;
        mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
        return mState;
      }
    }
  }

  return mState;
}

