65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
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/* $FreeBSD$ */
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/* $NetBSD: citrus_db_hash.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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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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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "citrus_namespace.h"
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#include "citrus_types.h"
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#include "citrus_bcs.h"
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#include "citrus_region.h"
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#include "citrus_db_hash.h"
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uint32_t
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_citrus_db_hash_std(struct _region *r)
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{
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const uint8_t *p;
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uint32_t hash, tmp;
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size_t i;
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hash = 0;
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p = _region_head(r);
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for (i = _region_size(r); i > 0; i--) {
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hash <<= 4;
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hash += _bcs_tolower(*p);
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tmp = hash & 0xF0000000;
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if (tmp != 0) {
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hash ^= tmp;
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hash ^= tmp >> 24;
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}
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p++;
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}
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return (hash);
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}
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