RarMemBlock.java

/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 05.06.2007
 *
 * 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 "&"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;"
 */
package com.github.junrar.unpack.ppm;

import com.github.junrar.io.Raw;



/**
 * DOCUMENT ME
 *
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public class RarMemBlock extends Pointer {

    public static final int size = 12;

    private int stamp, NU;

    private int next, prev; // Pointer RarMemBlock

    public RarMemBlock(byte[] mem) {
        super(mem);
    }

    public void insertAt(RarMemBlock p) {
        RarMemBlock temp = new RarMemBlock(mem);
        setPrev(p.getAddress());
        temp.setAddress(getPrev());
        setNext(temp.getNext()); // prev.getNext();
        temp.setNext(this); // prev.setNext(this);
        temp.setAddress(getNext());
        temp.setPrev(this); // next.setPrev(this);
    }

    public void remove() {
        RarMemBlock temp = new RarMemBlock(mem);
        temp.setAddress(getPrev());
        temp.setNext(getNext()); // prev.setNext(next);
        temp.setAddress(getNext());
        temp.setPrev(getPrev()); // next.setPrev(prev);
//        next = -1;
//        prev = -1;
    }

    public int getNext() {
        if (mem != null) {
            next = Raw.readIntLittleEndian(mem,  pos + 4);
        }
        return next;
    }

    public void setNext(RarMemBlock next) {
        setNext(next.getAddress());
    }

    public void setNext(int next) {
        this.next = next;
        if (mem != null) {
            Raw.writeIntLittleEndian(mem, pos + 4, next);
        }
    }

    public int getNU() {
        if (mem != null) {
            NU = Raw.readShortLittleEndian(mem,  pos + 2) & 0xffff;
        }
        return NU;
    }

    public void setNU(int nu) {
        NU = nu & 0xffff;
        if (mem != null) {
            Raw.writeShortLittleEndian(mem, pos + 2, (short) nu);
        }
    }

    public int getPrev() {
        if (mem != null) {
            prev = Raw.readIntLittleEndian(mem,  pos + 8);
        }
        return prev;
    }

    public void setPrev(RarMemBlock prev) {
        setPrev(prev.getAddress());
    }

    public void setPrev(int prev) {
        this.prev = prev;
        if (mem != null) {
            Raw.writeIntLittleEndian(mem, pos + 8, prev);
        }
    }

    public int getStamp() {
        if (mem != null) {
            stamp =  Raw.readShortLittleEndian(mem,  pos) & 0xffff;
        }
        return stamp;
    }

    public void setStamp(int stamp) {
        this.stamp = stamp;
        if (mem != null) {
            Raw.writeShortLittleEndian(mem, pos, (short) stamp);
        }
    }
}