01: /*
02: * @(#)Checksum.java 1.20 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: package java.util.zip;
29:
30: /**
31: * An interface representing a data checksum.
32: *
33: * @version 1.13, 02/02/00
34: * @author David Connelly
35: */
36: public interface Checksum {
37: /**
38: * Updates the current checksum with the specified byte.
39: *
40: * @param b the byte to update the checksum with
41: */
42: public void update(int b);
43:
44: /**
45: * Updates the current checksum with the specified array of bytes.
46: * @param b the byte array to update the checksum with
47: * @param off the start offset of the data
48: * @param len the number of bytes to use for the update
49: */
50: public void update(byte[] b, int off, int len);
51:
52: /**
53: * Returns the current checksum value.
54: * @return the current checksum value
55: */
56: public long getValue();
57:
58: /**
59: * Resets the checksum to its initial value.
60: */
61: public void reset();
62: }
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