/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* ***** BEGIN LICENSE BLOCK *****

 * Version: MPL 1.1/GPL 2.0/LGPL 2.1

 *

 * The contents of this file are subject to the Mozilla 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/MPL/

 *

 * 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 MPL, 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 MPL, 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;

}