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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.vm;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class BitInput {
/**
* the max size of the input
*/
public static final int MAX_SIZE = 0x8000;
protected int inAddr;
protected int inBit;
protected byte[] inBuf;
/**
*
*/
public void InitBitInput()
{
inAddr=0;
inBit=0;
}
/**
* @param Bits
*/
public void addbits(int Bits)
{
Bits+=inBit;
inAddr+=Bits>>3;
inBit=Bits&7;
}
/**
* @return the bits (unsigned short)
*/
public int getbits()
{
// int BitField=0;
// BitField|=(int)(inBuf[inAddr] << 16)&0xFF0000;
// BitField|=(int)(inBuf[inAddr+1] << 8)&0xff00;
// BitField|=(int)(inBuf[inAddr+2])&0xFF;
// BitField >>>= (8-inBit);
// return (BitField & 0xffff);
return (((((inBuf[inAddr] & 0xff) << 16) +
((inBuf[inAddr+1] & 0xff) << 8) +
((inBuf[inAddr+2] & 0xff))) >>> (8-inBit)) & 0xffff);
}
/**
*
*/
public BitInput()
{
inBuf=new byte[MAX_SIZE];
}
/**
* @param Bits add the bits
*/
public void faddbits(int Bits)
{
addbits(Bits);
}
/**
* @return get the bits
*/
public int fgetbits()
{
return(getbits());
}
/**
* Indicates an Overfow
* @param IncPtr how many bytes to inc
* @return true if an Oververflow would occur
*/
public boolean Overflow(int IncPtr) {
return(inAddr+IncPtr>=MAX_SIZE);
}
public byte[] getInBuf()
{
return inBuf;
}
}
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