1/* $FreeBSD$ */
2/* $NetBSD: citrus_db_hash.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */
3
4/*-
5 * Copyright (c)2003 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31#include <sys/types.h>
32
33#include <assert.h>
34#include <stdio.h>
35#include <string.h>
36
37#include "citrus_namespace.h"
38#include "citrus_types.h"
39#include "citrus_bcs.h"
40#include "citrus_region.h"
41#include "citrus_db_hash.h"
42
43uint32_t
44_citrus_db_hash_std(struct _region *r)
45{
46	const uint8_t *p;
47	uint32_t hash, tmp;
48	size_t i;
49
50	hash = 0;
51	p = _region_head(r);
52
53	for (i = _region_size(r); i > 0; i--) {
54		hash <<= 4;
55		hash += _bcs_tolower(*p);
56		tmp = hash & 0xF0000000;
57		if (tmp != 0) {
58			hash ^= tmp;
59			hash ^= tmp >> 24;
60		}
61		p++;
62	}
63	return (hash);
64}
65