1/*
2 * Copyright 2012, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.util;
33
34public abstract class NibbleUtils {
35    /**
36     * Extracts the high signed 4-bit nibble from the least significant
37     * byte of the given value
38     * @param value the value to extract the nibble from
39     * @return the extracted signed nibble value
40     */
41    public static int extractHighSignedNibble(int value) {
42        return (value << 24) >> 28;
43    }
44
45    /**
46     * Extracts the low signed 4-bit nibble from the least significant
47     * byte of the given value
48     * @param value the value to extract the nibble from
49     * @return the extracted signed nibble value
50     */
51    public static int extractLowSignedNibble(int value) {
52        return (value << 28) >> 28;
53    }
54
55    /**
56     * Extracts the high unsigned 4-bit nibble from the least significant
57     * byte of the given value
58     * @param value the value to extract the nibble from
59     * @return the extracted unsigned nibble value
60     */
61    public static int extractHighUnsignedNibble(int value) {
62        return (value & 0xF0) >>> 4;
63    }
64
65    /**
66     * Extracts the low unsigned 4-bit nibble from the least significant
67     * byte of the given value
68     * @param value the value to extract the nibble from
69     * @return the extracted unsigned nibble value
70     */
71    public static int extractLowUnsignedNibble(int value) {
72        return value & 0x0F;
73    }
74}
75