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