/*
* Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/**
* ByteArrayTagOrder: a class for comparing two DER encodings by the
* order of their tags.
*
* @author D. N. Hoover
*/
package sun.security.util;
import java.util.Comparator;
public class ByteArrayTagOrder implements Comparator<byte[]> {
/**
* Compare two byte arrays, by the order of their tags,
* as defined in ITU-T X.680, sec. 6.4. (First compare
* tag classes, then tag numbers, ignoring the constructivity bit.)
*
* @param bytes1 first byte array to compare.
* @param bytes2 second byte array to compare.
* @return negative number if bytes1 < bytes2, 0 if bytes1 == bytes2,
* positive number if bytes1 > bytes2.
*
* @exception <code>ClassCastException</code>
* if either argument is not a byte array.
*/
public final int compare(byte[] bytes1, byte[] bytes2) {
// tag order is same as byte order ignoring any difference in
// the constructivity bit (0x02)
return (bytes1[0] | 0x20) - (bytes2[0] | 0x20);
}
}