/*

 * 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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 */

package sun.security.util;

import java.util.Comparator;

/**

 * Compare two byte arrays in lexicographical order.

 *

 * @author D. N. Hoover

 */

public class ByteArrayLexOrder implements Comparator<byte[]> {

    /**

     * Perform lexicographical comparison of two byte arrays,

     * regarding each byte as unsigned.  That is, compare array entries

     * in order until they differ--the array with the smaller entry

     * is "smaller". If array entries are

     * equal till one array ends, then the longer array is "bigger".

     *

     * @param  bytes1 first byte array to compare.

     * @param  bytes2 second byte array to compare.

     * @return negative number if {@code bytes1 < bytes2},

     *         0 if {@code bytes1 == bytes2},

     *         positive number if {@code bytes1 > bytes2}.

     *

     * @exception <code>ClassCastException</code>

     * if either argument is not a byte array.

     */

    public final int compare( byte[] bytes1, byte[] bytes2) {

        int diff;

        for (int i = 0; i < bytes1.length && i < bytes2.length; i++) {

            diff = (bytes1[i] & 0xFF) - (bytes2[i] & 0xFF);

            if (diff != 0) {

                return diff;

            }

        }

        // if array entries are equal till the first ends, then the

        // longer is "bigger"

        return bytes1.length - bytes2.length;

    }

}