| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | package sun.security.util; |
| 28 | |
| 29 | import java.util.Comparator; |
| 30 | |
| 31 | /** |
| 32 | * Compare two byte arrays in lexicographical order. |
| 33 | * |
| 34 | * @author D. N. Hoover |
| 35 | */ |
| 36 | public class ByteArrayLexOrder implements Comparator<byte[]> { |
| 37 | |
| 38 | /** |
| 39 | * Perform lexicographical comparison of two byte arrays, |
| 40 | * regarding each byte as unsigned. That is, compare array entries |
| 41 | * in order until they differ--the array with the smaller entry |
| 42 | * is "smaller". If array entries are |
| 43 | * equal till one array ends, then the longer array is "bigger". |
| 44 | * |
| 45 | * @param bytes1 first byte array to compare. |
| 46 | * @param bytes2 second byte array to compare. |
| 47 | * @return negative number if bytes1 < bytes2, 0 if bytes1 == bytes2, |
| 48 | * positive number if bytes1 > bytes2. |
| 49 | * |
| 50 | * @exception <code>ClassCastException</code> |
| 51 | * if either argument is not a byte array. |
| 52 | */ |
| 53 | public final int compare( byte[] bytes1, byte[] bytes2) { |
| 54 | int diff; |
| 55 | for (int i = 0; i < bytes1.length && i < bytes2.length; i++) { |
| 56 | diff = (bytes1[i] & 0xFF) - (bytes2[i] & 0xFF); |
| 57 | if (diff != 0) { |
| 58 | return diff; |
| 59 | } |
| 60 | } |
| 61 | // if array entries are equal till the first ends, then the |
| 62 | // longer is "bigger" |
| 63 | return bytes1.length - bytes2.length; |
| 64 | } |
| 65 | |
| 66 | |
| 67 | } |