/*-

 * Copyright (c)2003 Citrus Project,

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include "dcmtk/config/osconfig.h"

#include "citrus_db_hash.h"

#include <sys/types.h>

#include <stdio.h>

#include <string.h>

#include "citrus_bcs.h"

#include "citrus_types.h"

#include "citrus_region.h"

uint32_t

_citrus_db_hash_std(struct _citrus_region *r)

{

    const uint8_t *p;

    uint32_t hash, tmp;

    size_t i;

    hash = 0;

    p = _citrus_region_head(r);

    for (i = _citrus_region_size(r); i > 0; i--) {

        hash <<= 4;

        hash += _citrus_bcs_tolower(*p);

        tmp = hash & 0xF0000000;

        if (tmp != 0) {

            hash ^= tmp;

            hash ^= tmp >> 24;

        }

        p++;

    }

    return (hash);

}