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/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 31.05.2007
*
* Source: $HeadURL$
* Last changed: $LastChangedDate$
*
* the unrar licence applies to all junrar source and binary distributions
* you are not allowed to use this source to re-create the RAR compression algorithm
*
* Here some html entities which can be used for escaping javadoc tags:
* "&": "&" or "&"
* "<": "<" or "<"
* ">": ">" or ">"
* "@": "@"
*/
package com.github.junrar.unpack.ppm;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class SEE2Context {
public static final int size = 4;
// ushort Summ;
private int summ;
// byte Shift;
private int shift;
// byte Count;
private int count;
public void init(int initVal) {
shift = (ModelPPM.PERIOD_BITS - 4)&0xff;
summ = (initVal << shift)&0xffff;
count = 4;
}
public int getMean() {
int retVal = summ >>> shift;
summ -= retVal;
return retVal + ((retVal == 0) ? 1 : 0);
}
public void update() {
if (shift < ModelPPM.PERIOD_BITS && --count == 0) {
summ += summ;
count = (3 << shift++);
}
summ &= 0xffff;
count &= 0xff;
shift &= 0xff;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count&0xff;
}
public int getShift() {
return shift;
}
public void setShift(int shift) {
this.shift = shift&0xff;
}
public int getSumm() {
return summ;
}
public void setSumm(int summ) {
this.summ = summ&0xffff;
}
public void incSumm(int dSumm) {
setSumm(getSumm() + dSumm);
}
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("SEE2Context[");
buffer.append("\n size=");
buffer.append(size);
buffer.append("\n summ=");
buffer.append(summ);
buffer.append("\n shift=");
buffer.append(shift);
buffer.append("\n count=");
buffer.append(count);
buffer.append("\n]");
return buffer.toString();
}
}
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