Checksum.java revision 51b1b6997fd3f980076b8081f7f1165ccc2a4008 
1/*
2 * Copyright (c) 1996, 1999, 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
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24 */
25
26package java.util.zip;
27
28/**
29 * An interface representing a data checksum.
30 *
31 * @author      David Connelly
32 */
33public
34interface Checksum {
35    /**
36     * Updates the current checksum with the specified byte.
37     *
38     * @param b the byte to update the checksum with
39     */
40    public void update(int b);
41
42    /**
43     * Updates the current checksum with the specified array of bytes.
44     * @param b the byte array to update the checksum with
45     * @param off the start offset of the data
46     * @param len the number of bytes to use for the update
47     */
48    public void update(byte[] b, int off, int len);
49
50    /**
51     * Returns the current checksum value.
52     * @return the current checksum value
53     */
54    public long getValue();
55
56    /**
57     * Resets the checksum to its initial value.
58     */
59    public void reset();
60}
61