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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/**
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* ByteArrayTagOrder: a class for comparing two DER encodings by the
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* order of their tags.
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*
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* @author D. N. Hoover
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*/
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package sun.security.util;
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import java.util.Comparator;
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public class ByteArrayTagOrder implements Comparator<byte[]> {
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/**
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* Compare two byte arrays, by the order of their tags,
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* as defined in ITU-T X.680, sec. 6.4. (First compare
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* tag classes, then tag numbers, ignoring the constructivity bit.)
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*
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* @param bytes1 first byte array to compare.
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* @param bytes2 second byte array to compare.
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* @return negative number if bytes1 < bytes2, 0 if bytes1 == bytes2,
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* positive number if bytes1 > bytes2.
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*
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* @exception <code>ClassCastException</code>
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* if either argument is not a byte array.
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*/
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public final int compare(byte[] bytes1, byte[] bytes2) {
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// tag order is same as byte order ignoring any difference in
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// the constructivity bit (0x02)
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return (bytes1[0] | 0x20) - (bytes2[0] | 0x20);
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}
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}
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