content: /* ***** 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/
   *
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   * 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):
   *   Kohei TAKETA <k-tak@void.in> (Java port)
   *
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   * ***** END LICENSE BLOCK ***** */
  
  package org.mozilla.universalchardet.prober;
  
  import org.mozilla.universalchardet.prober.statemachine.CodingStateMachine;
  import org.mozilla.universalchardet.prober.statemachine.SMModel;
  import org.mozilla.universalchardet.prober.statemachine.HZSMModel;
  import org.mozilla.universalchardet.prober.statemachine.ISO2022CNSMModel;
  import org.mozilla.universalchardet.prober.statemachine.ISO2022JPSMModel;
  import org.mozilla.universalchardet.prober.statemachine.ISO2022KRSMModel;
  
  
  public class EscCharsetProber extends CharsetProber {
      ////////////////////////////////////////////////////////////////
      // fields
      ////////////////////////////////////////////////////////////////
      private CodingStateMachine[]    codingSM;
      private int                     activeSM;
      private ProbingState            state;
      private String                  detectedCharset;
      
      private static final HZSMModel hzsModel = new HZSMModel();
      private static final ISO2022CNSMModel iso2022cnModel = new ISO2022CNSMModel();
      private static final ISO2022JPSMModel iso2022jpModel = new ISO2022JPSMModel();
      private static final ISO2022KRSMModel iso2022krModel = new ISO2022KRSMModel();
  
  
      ////////////////////////////////////////////////////////////////
      // methods
      ////////////////////////////////////////////////////////////////
  	public EscCharsetProber() {
          super();
  
          this.codingSM = new CodingStateMachine[4];
          this.codingSM[0] = new CodingStateMachine(hzsModel);
          this.codingSM[1] = new CodingStateMachine(iso2022cnModel);
          this.codingSM[2] = new CodingStateMachine(iso2022jpModel);
          this.codingSM[3] = new CodingStateMachine(iso2022krModel);
  
          reset();
      }
      
      @Override
  	public String getCharSetName() {
          return this.detectedCharset;
      }
  
      @Override
  	public float getConfidence() {
          return 0.99f;
      }
  
      @Override
  	public ProbingState getState() {
          return this.state;
      }
  
      @Override
  	public ProbingState handleData(byte[] buf, int offset, int length) {
          int codingState;
          
          int maxPos = offset + length;
          for (int i=offset; i<maxPos && this.state==ProbingState.DETECTING; ++i) {
              for (int j=this.activeSM-1; j>=0; --j) {
                  codingState = this.codingSM[j].nextState(buf[i]);
                  if (codingState == SMModel.ERROR) {
                      --this.activeSM;
                      if (this.activeSM <= 0) {
                          this.state = ProbingState.NOT_ME;
                          return this.state;
                      } else if (j != this.activeSM) {
                          CodingStateMachine t;
                          t = this.codingSM[this.activeSM];
                          this.codingSM[this.activeSM] = this.codingSM[j];
                          this.codingSM[j] = t;
                      }
                  } else if (codingState == SMModel.ITSME) {
                      this.state = ProbingState.FOUND_IT;
                      this.detectedCharset = this.codingSM[j].getCodingStateMachine();
                      return this.state;
                  }
              }
          }
          
          return this.state;
      }
  
      @Override
  	public final void reset() {
  		this.state = ProbingState.DETECTING;
  		for (int i = 0; i < this.codingSM.length; ++i) {
  			this.codingSM[i].reset();
  		}
  		this.activeSM = this.codingSM.length;
  		this.detectedCharset = null;
  	}
  
  	@Override
  	public void setOption() {
  	}
  }
  