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/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 01.06.2007
*
* 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;
import com.github.junrar.io.Raw;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class State extends Pointer {
public static final int size = 6;
public State(byte[] mem) {
super(mem);
}
public State init(byte[] mem) {
this.mem = mem;
pos = 0;
return this;
}
public int getSymbol() {
return mem[pos]&0xff;
}
public void setSymbol(int symbol) {
mem[pos] = (byte)symbol;
}
public int getFreq() {
return mem[pos+1]&0xff;
}
public void setFreq(int freq) {
mem[pos + 1] = (byte)freq;
}
public void incFreq(int dFreq) {
mem[pos + 1] += dFreq;
}
public int getSuccessor() {
return Raw.readIntLittleEndian(mem, pos+2);
}
public void setSuccessor(PPMContext successor) {
setSuccessor(successor.getAddress());
}
public void setSuccessor(int successor) {
Raw.writeIntLittleEndian(mem, pos + 2, successor);
}
public void setValues(StateRef state){
setSymbol(state.getSymbol());
setFreq(state.getFreq());
setSuccessor(state.getSuccessor());
}
public void setValues(State ptr){
System.arraycopy(ptr.mem, ptr.pos, mem, pos, size);
}
public State decAddress(){
setAddress(pos-size);
return this;
}
public State incAddress(){
setAddress(pos+size);
return this;
}
public static void ppmdSwap(State ptr1, State ptr2) {
byte[] mem1=ptr1.mem, mem2=ptr2.mem;
for (int i=0, pos1=ptr1.pos, pos2=ptr2.pos; i < size; i++, pos1++, pos2++) {
byte temp = mem1[pos1];
mem1[pos1] = mem2[pos2];
mem2[pos2] = temp;
}
}
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("State[");
buffer.append("\n pos=");
buffer.append(pos);
buffer.append("\n size=");
buffer.append(size);
buffer.append("\n symbol=");
buffer.append(getSymbol());
buffer.append("\n freq=");
buffer.append(getFreq());
buffer.append("\n successor=");
buffer.append(getSuccessor());
buffer.append("\n]");
return buffer.toString();
}
}
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