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 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 */ update(int b)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 */ update(byte[] b, int off, int len)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 */ getValue()54 public long getValue(); 55 56 /** 57 * Resets the checksum to its initial value. 58 */ reset()59 public void reset(); 60 } 61