1 /* $NetBSD: citrus_db_hash.c,v 1.1 2003/06/25 09:51:30 tshiozak 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 #include <sys/cdefs.h> 30 #if defined(LIBC_SCCS) && !defined(lint) 31 __RCSID("$NetBSD: citrus_db_hash.c,v 1.1 2003/06/25 09:51:30 tshiozak Exp $"); 32 #endif /* LIBC_SCCS and not lint */ 33 34 #ifndef HOSTPROG 35 #include "namespace.h" 36 #endif 37 #include <assert.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <sys/types.h> 41 42 #include "citrus_namespace.h" 43 #include "citrus_types.h" 44 #include "citrus_bcs.h" 45 #include "citrus_region.h" 46 #include "citrus_db_hash.h" 47 48 u_int32_t 49 /*ARGSUSED*/ 50 _citrus_db_hash_std(void *closure, struct _region *r) 51 { 52 const u_int8_t *p = _region_head(r); 53 u_int32_t hash = 0, tmp; 54 size_t i; 55 56 for (i=_region_size(r); i>0; i--) { 57 hash <<= 4; 58 hash += _bcs_tolower(*p); 59 tmp = hash & 0xF0000000; 60 if (tmp != 0) { 61 hash ^= tmp; 62 hash ^= tmp >> 24; 63 } 64 p++; 65 } 66 return hash; 67 } 68