/usr/include/dnsdb/htable.h is in libyadifa-dev 2.2.3-1+deb9u1.
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*
* Copyright (c) 2011-2016, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of EURid nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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
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* 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.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup dnsdbcollection Collections used by the database
* @ingroup dnsdb
* @brief Hash-Table structure and functions.
*
* Implementation of the Hash-Table structure and functions.
* It can be configured to be thread-safe. (4 modes)
*
* It is used in the hash-table of balanced trees structure. (htbt)
*
* Mutex support has been removed the 2009/02/24.
*
* @{
*/
#ifndef _HTABLE_H
#define _HTABLE_H
#define HTABLE_USE_MERSENE
#ifdef __cplusplus
extern "C"
{
#endif
#define HTABLE_TAG 0x454c42415448 /* "HTABLE" */
typedef struct
{
void* data; /* 4 or 8 bytes (32 or 64 bits systems) */
} htable_entry; /* => 12 or 16 bytes (32 or 64 bits systems) */
/** @brief Allocates an hash table of the pre-defined size
*
* Allocates an hash table of the pre-defined size
*
* @return A pointer to the htable or NULL if an error occurred
*/
htable_entry* htable_alloc();
/** @brief Frees an htable
*
* Frees an htable
*
* @param[in] table a pointer to the htable to free
*
*/
void htable_free(htable_entry* table);
#if defined(HTABLE_USE_MERSENE)
#define NOHASHTBL 0
#define MERSENE_1 3
#define MERSENE_2 7
#define MERSENE_3 31
#define MERSENE_4 127
#define MERSENE_5 8191
#define MERSENE_6 131071
#define MERSENE_7 524287
#define MERSENE_8 2147483647 /* This is, of course, not an option */
/* Given the statistics, MERSENE_7 is by far the best choice */
#define DEFAULT_HTABLE_SIZE (MERSENE_7+1)
/** @brief Retrieve the htable entry for a given hash
*
* Retrieve the htable entry for a given hash.
* This version uses a bitmask with a mersene prime.
*
* @param[in] table a pointer to the htable
* @param[in] hash the hash value to look for.
*
*/
#define htable_get(table,hash) ((table)[(hash)&(DEFAULT_HTABLE_SIZE-1)])
#else /* MODULO */
/* 1061 1063 */
/* 10007 10009 */
#define DEFAULT_HTABLE_SIZE 10007
/** @brief Retrieve the htable entry for a given hash
*
* Retrieve the htable entry for a given hash.
* This version uses a modulo with a prime.
*
* @param[in] table a pointer to the htable
* @param[in] hash the hash value to look for.
*
*/
#define htable_get(table,hash) ((table)[(hash)%DEFAULT_HTABLE_SIZE])
#endif
#ifdef __cplusplus
}
#endif
#endif /* _HTABLE_H */
/** @} */
/*----------------------------------------------------------------------------*/
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