1 /* $OpenBSD: uuid_hash.c,v 1.2 2015/09/10 18:13:46 guenther Exp $ */ 2 /* $NetBSD: uuid_hash.c,v 1.2 2008/04/23 07:52:32 plunky Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Marcel Moolenaar 6 * Copyright (c) 2002 Hiten Mahesh Pandya 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: src/lib/libc/uuid/uuid_hash.c,v 1.2 2003/08/08 19:18:43 marcel Exp $ 31 */ 32 33 #include <uuid.h> 34 35 /* 36 * uuid_hash() - generate a hash value. 37 * See also: 38 * http://www.opengroup.org/onlinepubs/009629399/uuid_hash.htm 39 */ 40 uint16_t 41 uuid_hash(const uuid_t *u, uint32_t *status) 42 { 43 if (status) 44 *status = uuid_s_ok; 45 46 /* 47 * Use the most frequently changing bits in the UUID as the hash 48 * value. This should yield a good enough distribution... 49 */ 50 return ((u) ? u->time_low & 0xffff : 0); 51 } 52