1 /* 2 * Copyright (c) 2000, 2018, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.util.zip.CRC32; 25 26 /** 27 * Checksum provides methods for calculating a CRC32 value for a 28 * transitions table. 29 * 30 * @since 1.4 31 */ 32 public class Checksum extends CRC32 33 { 34 /** 35 * Updates the CRC32 value from each byte of the given int 36 * value. The bytes are used in the big endian order. 37 * @param val the int value 38 */ 39 public void update(int val) { 40 byte[] b = new byte[4]; 41 b[0] = (byte)((val >>> 24) & 0xff); 42 b[1] = (byte)((val >>> 16) & 0xff); 43 b[2] = (byte)((val >>> 8) & 0xff); 44 b[3] = (byte)(val & 0xff); 45 update(b); 46 } 47 48 /** 49 * Updates the CRC32 value from each byte of the given long 50 * value. The bytes are used in the big endian order. 51 * @param val the long value 52 */ 53 void update(long val) { 54 byte[] b = new byte[8]; 55 b[0] = (byte)((val >>> 56) & 0xff); 56 b[1] = (byte)((val >>> 48) & 0xff); 57 b[2] = (byte)((val >>> 40) & 0xff); 58 b[3] = (byte)((val >>> 32) & 0xff); 59 b[4] = (byte)((val >>> 24) & 0xff); 60 b[5] = (byte)((val >>> 16) & 0xff); 61 b[6] = (byte)((val >>> 8) & 0xff); 62 b[7] = (byte)(val & 0xff); 63 update(b); 64 } 65 }