1 // IChecksum.cs - Interface to compute a data checksum
2 // Copyright (C) 2001 Mike Krueger
4 // This file was translated from java, it was part of the GNU Classpath
5 // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 2
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15 // GNU General Public License for more details.
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19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 // Linking this library statically or dynamically with other modules is
22 // making a combined work based on this library. Thus, the terms and
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38 namespace ICSharpCode.SharpZipLib.Silverlight.Checksums
41 /// Interface to compute a data checksum used by checked input/output streams.
42 /// A data checksum can be updated by one byte or with a byte array. After each
43 /// update the value of the current checksum can be returned by calling
44 /// <code>getValue</code>. The complete checksum object can also be reset
45 /// so it can be used again with new data.
47 public interface IChecksum
50 /// Returns the data checksum computed so far.
58 /// Resets the data checksum as if no update was ever called.
63 /// Adds one byte to the data checksum.
65 /// <param name = "value">
66 /// the data value to add. The high byte of the int is ignored.
68 void Update(int value);
71 /// Updates the data checksum with the bytes taken from the array.
73 /// <param name="buffer">
74 /// buffer an array of bytes
76 void Update(byte[] buffer);
79 /// Adds the byte array to the data checksum.
81 /// <param name = "buffer">
82 /// The buffer which contains the data
84 /// <param name = "offset">
85 /// The offset in the buffer where the data starts
87 /// <param name = "count">
88 /// the number of data bytes to add.
90 void Update(byte[] buffer, int offset, int count);