ez_hash.h

/*

Copyright (c) 2019 Joseph Rothrock

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/

#include <stdint.h>
#include "fnv.h"

#define THREAD_COUNT 4

// A record in the hash table.
typedef struct ez_hash_rec_struct {
  char* key;                          // string that we hash on.
  char* value;                        // payload of the record.
  struct ez_hash_rec_struct* next;		// points to next record in the same bucket.
} ez_hash_rec;


// The hash data structure. 
typedef struct ez_hash_table_struct {
  int hash_bits;              // A number between 2 and 32. 2^hash_bits - 1 = number of buckets.
  int n_members;              // Number of records stored in the hash.
  ez_hash_rec** buckets;      // Each element is a hash bucket. The array subscript is the hash code.
															// A bucket is a linked list of ez_hash_rec.
	Fnv32_t	max_bucket;					// The array subscript of the last bucket.
} ez_hash_table;


ez_hash_table* ez_hash_init(Fnv32_t n);

void *_inner_loop_free(void* args);

void ez_hash_free(ez_hash_table* h);

Fnv32_t ez_hash_set(ez_hash_table* h, char* key, char* value);

char* ez_hash_get(ez_hash_table* h, char* key);

int ez_hash_del(ez_hash_table* h, char* key);

Fnv32_t _get_hash_val(Fnv32_t bits, char* key);

ez_hash_rec* _init_new_rec(char* key, char* value);