org.fox.ttcomics/src/main/java/org/fox/ttcomics2/junrar/unsigned/UnsignedByte.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

/*
 * 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:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package org.fox.ttcomics2.junrar.unsigned;

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);
    }
}