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/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 04.06.2007
*
* 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.unsigned;
import com.github.junrar.crc.RarCRC;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class UnsignedByte {
public static byte longToByte(long unsignedByte1){
return (byte) (unsignedByte1&0xff);
}
public static byte intToByte(int unsignedByte1){
return (byte) (unsignedByte1&0xff);
}
public static byte shortToByte(short unsignedByte1){
return (byte) (unsignedByte1&0xff);
}
public static short add(byte unsignedByte1, byte unsignedByte2){
return (short) (unsignedByte1 + unsignedByte2);
}
public static short sub(byte unsignedByte1, byte unsignedByte2){
return (short) (unsignedByte1 - unsignedByte2);
}
public static void main(String[] args)
{
//tests unsigned (signed)
//add
System.out.println(add((byte)0xfe,(byte)0x01)); //255 (-1)
System.out.println(add((byte)0xff,(byte)0x01)); //0 (0)
System.out.println(add((byte)0x7f,(byte)0x01)); //128 (-128)
System.out.println(add((byte)0xff,(byte)0xff)); //254 (-2)
//sub
System.out.println(sub((byte)0xfe,(byte)0x01)); //253 (-3)
System.out.println(sub((byte)0x00,(byte)0x01)); //255 (-1)
System.out.println(sub((byte)0x80,(byte)0x01)); //127 (127)
//mul
System.out.println((byte)-1*(byte)-1);
}
}
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