/*
 * Copyright (c) 2008-2024 OARC, Inc.
 * Copyright (c) 2007-2008, Internet Systems Consortium, Inc.
 * Copyright (c) 2003-2007, The Measurement Factory, Inc.
 * 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.
 *
 * 3. Neither the name of the copyright holder 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 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.
 */

#ifndef __dsc_hashtbl_h
#define __dsc_hashtbl_h

#include <stddef.h>
#include <stdint.h>

typedef struct _hashitem {
    const void*       key;
    void*             data;
    struct _hashitem* next;
} hashitem;

typedef unsigned int hashfunc(const void* key);
typedef int          hashkeycmp(const void* a, const void* b);
typedef void         hashfree(void* p);

typedef struct
{
    unsigned int modulus;
    hashitem**   items;
    hashfunc*    hasher;
    hashkeycmp*  keycmp;
    int          use_arena;
    hashfree*    keyfree;
    hashfree*    datafree;
    struct
    {
        hashitem*    next;
        unsigned int slot;
    } iter;
} hashtbl;

hashtbl* hash_create(int N, hashfunc*, hashkeycmp*, int use_arena, hashfree*, hashfree*);
void     hash_destroy(hashtbl*);
int      hash_add(const void* key, void* data, hashtbl*);
void     hash_remove(const void* key, hashtbl* tbl);
void*    hash_find(const void* key, hashtbl*);
void     hash_iter_init(hashtbl*);
void*    hash_iterate(hashtbl*);

// dst needs to be at least len * 2 in size
void strtohex(char* dst, const char* src, size_t len);

/*
 * found in lookup3.c
 */
extern uint32_t hashlittle(const void* key, size_t length, uint32_t initval);
extern uint32_t hashbig(const void* key, size_t length, uint32_t initval);
extern uint32_t hashword(const uint32_t* k, size_t length, uint32_t initval);

#ifdef HAVE_ENDIAN_H
#include <endian.h>
#endif
#ifdef HAVE_SYS_ENDIAN_H
#include <sys/endian.h>
#endif
#ifdef HAVE_MACHINE_ENDIAN_H
#include <machine/endian.h>
#endif

#ifndef __BYTE_ORDER
#if defined(BYTE_ORDER)
#define __BYTE_ORDER BYTE_ORDER
#elif defined(_BYTE_ORDER)
#define __BYTE_ORDER _BYTE_ORDER
#else
#error "No byte order define, please fix"
#endif
#endif
#ifndef __LITTLE_ENDIAN
#if defined(LITTLE_ENDIAN)
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#elif defined(_LITTLE_ENDIAN)
#define __LITTLE_ENDIAN _LITTLE_ENDIAN
#else
#error "No little endian define, please fix"
#endif
#endif
#ifndef __BIG_ENDIAN
#if defined(BIG_ENDIAN)
#define __BIG_ENDIAN BIG_ENDIAN
#elif defined(_BIG_ENDIAN)
#define __BIG_ENDIAN _BIG_ENDIAN
#else
#error "No big endian define, please fix"
#endif
#endif

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define hashendian hashlittle
#elif __BYTE_ORDER == __BIG_ENDIAN
#define hashendian hashbig
#else
#error "No byte order define, please fix"
#endif

#endif /* __dsc_hashtbl_h */