1/*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26import java.util.zip.CRC32;
27
28/**
29 * Checksum provides methods for calculating a CRC32 value for a
30 * transitions table.
31 *
32 * @since 1.4
33 */
34public class Checksum extends CRC32
35{
36    /**
37     * Updates the CRC32 value from each byte of the given int
38     * value. The bytes are used in the big endian order.
39     * @param val the int value
40     */
41    public void update(int val) {
42        byte[] b = new byte[4];
43        b[0] = (byte)((val >>> 24) & 0xff);
44        b[1] = (byte)((val >>> 16) & 0xff);
45        b[2] = (byte)((val >>> 8) & 0xff);
46        b[3] = (byte)(val & 0xff);
47        update(b);
48    }
49
50    /**
51     * Updates the CRC32 value from each byte of the given long
52     * value. The bytes are used in the big endian order.
53     * @param val the long value
54     */
55    void update(long val) {
56        byte[] b = new byte[8];
57        b[0] = (byte)((val >>> 56) & 0xff);
58        b[1] = (byte)((val >>> 48) & 0xff);
59        b[2] = (byte)((val >>> 40) & 0xff);
60        b[3] = (byte)((val >>> 32) & 0xff);
61        b[4] = (byte)((val >>> 24) & 0xff);
62        b[5] = (byte)((val >>> 16) & 0xff);
63        b[6] = (byte)((val >>> 8) & 0xff);
64        b[7] = (byte)(val & 0xff);
65        update(b);
66    }
67}
68