1 /*
2 * Copyright 1996-1999 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.util.zip;
27
28 /**
29 * An interface representing a data checksum.
30 *
31 * @author David Connelly
32 */
33 public
34 interface 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 }
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