// IChecksum.cs - Interface to compute a data checksum // Copyright (C) 2001 Mike Krueger // // This file was translated from java, it was part of the GNU Classpath // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. // // Linking this library statically or dynamically with other modules is // making a combined work based on this library. Thus, the terms and // conditions of the GNU General Public License cover the whole // combination. // // As a special exception, the copyright holders of this library give you // permission to link this library with independent modules to produce an // executable, regardless of the license terms of these independent // modules, and to copy and distribute the resulting executable under // terms of your choice, provided that you also meet, for each linked // independent module, the terms and conditions of the license of that // module. An independent module is a module which is not derived from // or based on this library. If you modify this library, you may extend // this exception to your version of the library, but you are not // obligated to do so. If you do not wish to do so, delete this // exception statement from your version. namespace ICSharpCode.SharpZipLib.Checksums { /// /// Interface to compute a data checksum used by checked input/output streams. /// A data checksum can be updated by one byte or with a byte array. After each /// update the value of the current checksum can be returned by calling /// getValue. The complete checksum object can also be reset /// so it can be used again with new data. /// public interface IChecksum { /// /// Returns the data checksum computed so far. /// long Value { get; } /// /// Resets the data checksum as if no update was ever called. /// void Reset(); /// /// Adds one byte to the data checksum. /// /// /// the data value to add. The high byte of the int is ignored. /// void Update(int bval); /// /// Updates the data checksum with the bytes taken from the array. /// /// /// buffer an array of bytes /// void Update(byte[] buffer); /// /// Adds the byte array to the data checksum. /// /// /// the buffer which contains the data /// /// /// the offset in the buffer where the data starts /// /// /// the length of the data /// void Update(byte[] buf, int off, int len); } }