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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The contents of this file are subject to the Mozilla Public License Version
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* for the specific language governing rights and limitations under the
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* 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.SJISSMModel;
import org.mozilla.universalchardet.prober.statemachine.SMModel;
import org.mozilla.universalchardet.prober.contextanalysis.SJISContextAnalysis;
import org.mozilla.universalchardet.prober.distributionanalysis.SJISDistributionAnalysis;
import org.mozilla.universalchardet.Constants;
public class SJISProber extends CharsetProber
{
////////////////////////////////////////////////////////////////
// fields
////////////////////////////////////////////////////////////////
private CodingStateMachine codingSM;
private ProbingState state;
private SJISContextAnalysis contextAnalyzer;
private SJISDistributionAnalysis distributionAnalyzer;
private byte[] lastChar;
private static final SMModel smModel = new SJISSMModel();
////////////////////////////////////////////////////////////////
// methods
////////////////////////////////////////////////////////////////
public SJISProber()
{
super();
this.codingSM = new CodingStateMachine(smModel);
this.contextAnalyzer = new SJISContextAnalysis();
this.distributionAnalyzer = new SJISDistributionAnalysis();
this.lastChar = new byte[2];
reset();
}
@Override
public String getCharSetName()
{
return Constants.CHARSET_SHIFT_JIS;
}
@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, 2-charLen, charLen);
this.distributionAnalyzer.handleOneChar(this.lastChar, 0, charLen);
} else {
this.contextAnalyzer.handleOneChar(buf, i+1-charLen, 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 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()
{}
}