/* Copyright (C) 2007-2017 Open Information Security Foundation

 *

 * You can copy, redistribute or modify this Program under the terms of

 * the GNU General Public License version 2 as published by the Free

 * Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * version 2 along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA.

 */

#include "suricata-common.h"

#include "util-hash-string.h"

/* djb2 string hashing */

uint32_t StringHashDjb2(const uint8_t *data, uint32_t datalen)

{

    uint32_t hash = 5381;

    for (uint32_t i = 0; i < datalen; i++) {

        uint32_t c = data[i];

        hash = ((hash << 5) + hash) + c; /* hash * 33 + c */

    }

    return hash;

}

/* djb2 string hashing */

uint32_t StringHashFunc(HashTable *ht, void *data, uint16_t datalen)

{

    return StringHashDjb2(data, datalen) % ht->array_size;

}

char StringHashCompareFunc(void *data1, uint16_t datalen1,

                           void *data2, uint16_t datalen2)

{

    int len1 = strlen((char *)data1);

    int len2 = strlen((char *)data2);

    if (len1 == len2 && memcmp(data1, data2, len1) == 0) {

        return 1;

    }

    return 0;

}

void StringHashFreeFunc(void *data)

{

    SCFree(data);

}