66 lines
2.2 KiB
Java
66 lines
2.2 KiB
Java
/*
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* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.util.zip.CRC32;
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/**
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* Checksum provides methods for calculating a CRC32 value for a
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* transitions table.
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*
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* @since 1.4
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*/
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public class Checksum extends CRC32
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{
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/**
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* Updates the CRC32 value from each byte of the given int
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* value. The bytes are used in the big endian order.
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* @param val the int value
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*/
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public void update(int val) {
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byte[] b = new byte[4];
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b[0] = (byte)((val >>> 24) & 0xff);
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b[1] = (byte)((val >>> 16) & 0xff);
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b[2] = (byte)((val >>> 8) & 0xff);
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b[3] = (byte)(val & 0xff);
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update(b);
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}
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/**
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* Updates the CRC32 value from each byte of the given long
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* value. The bytes are used in the big endian order.
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* @param val the long value
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*/
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void update(long val) {
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byte[] b = new byte[8];
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b[0] = (byte)((val >>> 56) & 0xff);
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b[1] = (byte)((val >>> 48) & 0xff);
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b[2] = (byte)((val >>> 40) & 0xff);
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b[3] = (byte)((val >>> 32) & 0xff);
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b[4] = (byte)((val >>> 24) & 0xff);
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b[5] = (byte)((val >>> 16) & 0xff);
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b[6] = (byte)((val >>> 8) & 0xff);
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b[7] = (byte)(val & 0xff);
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update(b);
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}
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}
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