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      1 /*	$NetBSD: citrus_db_hash.c,v 1.5 2008/02/09 14:56:20 junyoung 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 1.5 2008/02/09 14:56:20 junyoung 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 
     52 uint32_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