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
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   *
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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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  package org.mozilla.universalchardet.prober;
  
  import org.mozilla.universalchardet.prober.statemachine.CodingStateMachine;
  import org.mozilla.universalchardet.prober.statemachine.EUCJPSMModel;
  import org.mozilla.universalchardet.prober.statemachine.SMModel;
  import org.mozilla.universalchardet.prober.contextanalysis.EUCJPContextAnalysis;
  import org.mozilla.universalchardet.prober.distributionanalysis.EUCJPDistributionAnalysis;
  import org.mozilla.universalchardet.Constants;
  
  
  public class EUCJPProber extends CharsetProber {
      ////////////////////////////////////////////////////////////////
      // fields
      ////////////////////////////////////////////////////////////////
      private CodingStateMachine          codingSM;
      private ProbingState                state;
      
      private EUCJPContextAnalysis        contextAnalyzer;
      private EUCJPDistributionAnalysis   distributionAnalyzer;
      
      private byte[]                      lastChar;
  
      private static final SMModel smModel = new EUCJPSMModel();
  
      
      ////////////////////////////////////////////////////////////////
      // methods
      ////////////////////////////////////////////////////////////////
  	public EUCJPProber() {
          super();
          this.codingSM = new CodingStateMachine(smModel);
          this.contextAnalyzer = new EUCJPContextAnalysis();
          this.distributionAnalyzer = new EUCJPDistributionAnalysis();
          this.lastChar = new byte[2];
          reset();
      }
  
      @Override
  	public String getCharSetName() {
          return Constants.CHARSET_EUC_JP;
      }
  
      @Override
  	public float getConfidence() {
          float contextCf = this.contextAnalyzer.getConfidence();
          float distribCf = this.distributionAnalyzer.getConfidence();
          
          return Math.max(contextCf, distribCf);
      }
  
      @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; ++i) {
              codingState = this.codingSM.nextState(buf[i]);
              if (codingState == SMModel.ERROR) {
                  this.state = ProbingState.NOT_ME;
                  break;
              }
              if (codingState == SMModel.ITSME) {
                  this.state = ProbingState.FOUND_IT;
                  break;
              }
              if (codingState == SMModel.START) {
                  int charLen = this.codingSM.getCurrentCharLen();
                  
                  if (i == offset) {
                      this.lastChar[1] = buf[offset];
                      this.contextAnalyzer.handleOneChar(this.lastChar, 0, charLen);
                      this.distributionAnalyzer.handleOneChar(this.lastChar, 0, charLen);
                  } else {
                      this.contextAnalyzer.handleOneChar(buf, i-1, charLen);
                      this.distributionAnalyzer.handleOneChar(buf, i-1, charLen);
                  }
              }
          }
          
          this.lastChar[0] = buf[maxPos-1];
          
          if (this.state == ProbingState.DETECTING) {
              if (this.contextAnalyzer.gotEnoughData() && getConfidence() > SHORTCUT_THRESHOLD) {
                  this.state = ProbingState.FOUND_IT;
              }
          }
          
          return this.state;
      }
  
      @Override
  	public final void reset() {
          this.codingSM.reset();
          this.state = ProbingState.DETECTING;
          this.contextAnalyzer.reset();
          this.distributionAnalyzer.reset();
          java.util.Arrays.fill(this.lastChar, (byte)0);
      }
  
      @Override
  	public void setOption() {
  	}
  }
  