1/*	$NetBSD: citrus_db_hash.c,v 1.4 2004/01/02 21:49:35 itojun Exp $	*/
2
3/*-
4 * Copyright (c)2003 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#if HAVE_NBTOOL_CONFIG_H
30#include "nbtool_config.h"
31#endif
32
33#include <sys/cdefs.h>
34#if defined(LIBC_SCCS) && !defined(lint)
35__RCSID("$NetBSD: citrus_db_hash.c,v 1.4 2004/01/02 21:49:35 itojun Exp $");
36#endif /* LIBC_SCCS and not lint */
37
38#ifndef HOSTPROG
39#include "namespace.h"
40#endif
41#include <assert.h>
42#include <stdio.h>
43#include <string.h>
44#include <sys/types.h>
45
46#include "citrus_namespace.h"
47#include "citrus_types.h"
48#include "citrus_bcs.h"
49#include "citrus_region.h"
50#include "citrus_db_hash.h"
51
52uint32_t
53/*ARGSUSED*/
54_citrus_db_hash_std(void *closure, struct _region *r)
55{
56	const uint8_t *p = _region_head(r);
57	uint32_t hash = 0, tmp;
58	size_t i;
59
60	for (i = _region_size(r); i > 0; i--) {
61		hash <<= 4;
62		hash += _bcs_tolower(*p);
63		tmp = hash & 0xF0000000;
64		if (tmp != 0) {
65			hash ^= tmp;
66			hash ^= tmp >> 24;
67		}
68		p++;
69	}
70	return hash;
71}
72