1 /* 2 * Copyright (c) 2000, 2013, 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 import java.util.zip.CRC32; 27 28 /** 29 * Checksum provides methods for calculating a CRC32 value for a 30 * transitions table. 31 * 32 * @since 1.4 33 */ 34 public class Checksum extends CRC32 35 { 36 /** 37 * Updates the CRC32 value from each byte of the given int 38 * value. The bytes are used in the big endian order. 39 * @param val the int value 40 */ 41 public void update(int val) { 42 byte[] b = new byte[4]; 43 b[0] = (byte)((val >>> 24) & 0xff); 44 b[1] = (byte)((val >>> 16) & 0xff); 45 b[2] = (byte)((val >>> 8) & 0xff); 46 b[3] = (byte)(val & 0xff); 47 update(b); 48 } 49 50 /** 51 * Updates the CRC32 value from each byte of the given long 52 * value. The bytes are used in the big endian order. 53 * @param val the long value 54 */ 55 void update(long val) { 56 byte[] b = new byte[8]; 57 b[0] = (byte)((val >>> 56) & 0xff); 58 b[1] = (byte)((val >>> 48) & 0xff); 59 b[2] = (byte)((val >>> 40) & 0xff); 60 b[3] = (byte)((val >>> 32) & 0xff); 61 b[4] = (byte)((val >>> 24) & 0xff); 62 b[5] = (byte)((val >>> 16) & 0xff); 63 b[6] = (byte)((val >>> 8) & 0xff); 64 b[7] = (byte)(val & 0xff); 65 update(b); 66 } 67 }