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