Muldersoft/LibHashSet
Muldersoft/LibHashSet
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LoRd_MuldeR 2022-11-19 17:34:56 +01:00
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/******************************************************************************/
/* HashSet for C99, by LoRd_MuldeR <MuldeR2@GMX.de> */
/* This work has been released under the CC0 1.0 Universal license! */
/******************************************************************************/
#include "hash_set.h"
/* CRT */
#include <string.h>
#if defined(__GNUC__)
# define INLINE __inline__
#elif defined(_MSC_VER)
# define INLINE __inline
#else
# define INLINE
#endif
struct _hash_set_data
{
uint64_t *values;
uint8_t *used;
size_t capacity;
};
struct _hash_set
{
double load_factor;
int fail_fast;
struct _hash_set_data data;
size_t size, limit;
};
#define BOUND(MIN,VAL,MAX) (((VAL) < (MIN)) ? (MIN) : (((VAL) > (MAX)) ? (MAX) : (VAL)))
#define BOOLIFY(X) (!!(X))
/* ========================================================================= */
/* PRIVATE FUNCTIONS */
/* ========================================================================= */
static INLINE size_t hash(uint64_t value, const size_t capacity)
{
#if SIZE_MAX > UINT32_MAX
uint64_t h = UINT64_C(14695981039346656037);
for (size_t i = 0U; i < sizeof(uint64_t); ++i, value >>= CHAR_BIT)
{
h ^= value & 0xFF;
h *= UINT64_C(1099511628211);
}
#else
uint32_t h = UINT32_C(2166136261);
for (size_t i = 0U; i < sizeof(uint64_t); ++i, value >>= CHAR_BIT)
{
h ^= value & 0xFF;
h *= UINT32_C(16777619);
}
#endif
return ((size_t) h) % capacity;
}
static INLINE size_t round(double d)
{
return (d >= 0.0) ? ((size_t)(d + 0.5)) : ((size_t)(d - ((double)((size_t)(d - 1))) + 0.5)) + ((size_t)(d - 1));
}
static INLINE size_t safe_mult(const size_t a, const size_t b)
{
if ((a == 0U) || (b == 0U))
{
return 0U;
}
const size_t result = a * b;
return(result / a != b) ? SIZE_MAX : result;
}
static INLINE size_t next_pow2(const size_t minimum)
{
size_t result = 2U;
while (result < minimum)
{
result = safe_mult(result, 2U);
}
return result;
}
static INLINE int alloc_data(struct _hash_set_data *const data, const size_t capacity)
{
memset(data, 0, sizeof(struct _hash_set_data));
data->values = (uint64_t*) calloc(capacity, sizeof(uint64_t));
if (!data->values)
{
return 0;
}
data->used = (uint8_t*) calloc((capacity + 7U) / 8U, sizeof(uint8_t));
if (!data->used)
{
free(data->values);
data->values = NULL;
return 0;
}
data->capacity = capacity;
return 1;
}
static INLINE void free_data(struct _hash_set_data *const data)
{
if (data)
{
if (data->values)
{
free(data->values);
data->values = NULL;
}
if (data->used)
{
free(data->used);
data->used = NULL;
}
data->capacity = 0U;
}
}
static INLINE int is_used(struct _hash_set_data *const data, const size_t index)
{
return (data->used[index / 8U] >> (index % 8U)) & 1U;
}
static INLINE int find_value(struct _hash_set_data* const data, const uint64_t value, size_t *const index_out)
{
size_t index = hash(value, data->capacity);
while (is_used(data, index))
{
if (data->values[index] == value)
{
if (index_out)
{
*index_out = index;
}
return 1;
}
if (++index >= data->capacity)
{
index = 0U;
}
}
if (index_out)
{
*index_out = index;
}
return 0;
}
static INLINE void insert_value(struct _hash_set_data *const data, const size_t index, const uint64_t value)
{
data->values[index] = value;
data->used[index / 8U] |= 1U << (index % 8U);
}
static INLINE void swap_data(struct _hash_set_data *const a, struct _hash_set_data *const b)
{
struct _hash_set_data temp = *a;
*a = *b;
*b = temp;
}
static INLINE int grow_set(hash_set_t *const instance, const size_t new_capacity)
{
struct _hash_set_data temp;
if (!alloc_data(&temp, new_capacity))
{
return 0;
}
for (size_t i = 0; i < instance->data.capacity; ++i)
{
if (is_used(&instance->data, i))
{
const uint64_t value = instance->data.values[i];
size_t index;
if (find_value(&temp, value, &index))
{
abort(); /*whoops!*/
}
insert_value(&temp, index, value);
}
}
swap_data(&instance->data, &temp);
free_data(&temp);
instance->limit = round(instance->data.capacity * instance->load_factor);
return 1;
}
/* ========================================================================= */
/* PUBLIC FUNCTIONS */
/* ========================================================================= */
hash_set_t *hash_set_create(const double load_factor, const int fail_fast, const size_t initial_capacity)
{
hash_set_t *const instance = (hash_set_t*) calloc(1U, sizeof(hash_set_t));
if (!instance)
{
return NULL;
}
if (!alloc_data(&instance->data, (initial_capacity > 0U) ? next_pow2(initial_capacity) : 1024U))
{
free(instance);
return NULL;
}
instance->load_factor = (load_factor > 0.0) ? BOUND(0.001953125, load_factor, 1.0) : 0.75;
instance->fail_fast = BOOLIFY(fail_fast);
instance->limit = round(instance->data.capacity * instance->load_factor);
return instance;
}
void hash_set_destroy(hash_set_t *const instance)
{
if (instance)
{
free_data(&instance->data);
instance->size = 0U;
instance->limit = 0U;
}
}
int hash_set_insert(hash_set_t *const instance, const uint64_t value)
{
if ((!instance) || (!instance->data.values))
{
return -1;
}
size_t index;
if (find_value(&instance->data, value, &index))
{
return 0;
}
if ((instance->size >= instance->limit) || (instance->size >= instance->data.capacity))
{
if (instance->data.capacity == SIZE_MAX)
{
if (instance->fail_fast || (instance->size >= instance->data.capacity))
{
return -1; /*malloc has failed!*/
}
}
else
{
if (grow_set(instance, safe_mult(instance->data.capacity, 2U)))
{
if (find_value(&instance->data, value, &index))
{
abort(); /*whoops!*/
}
}
else
{
if (instance->fail_fast || (instance->size >= instance->data.capacity))
{
return -1; /*malloc has failed!*/
}
instance->limit = instance->data.capacity;
}
}
}
insert_value(&instance->data, index, value);
++instance->size;
return 1;
}
int hash_set_contains(hash_set_t *const instance, const uint64_t value)
{
if ((!instance) || (!instance->data.values))
{
return -1;
}
return find_value(&instance->data, value, NULL);
}
size_t hash_set_current_size(hash_set_t *const instance)
{
return instance ? instance->size : 0U;
}

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/******************************************************************************/
/* HashSet for C99, by LoRd_MuldeR <MuldeR2@GMX.de> */
/* This work has been released under the CC0 1.0 Universal license! */
/******************************************************************************/
#ifndef _INC_HASH_SET_H
#define _INC_HASH_SET_H
#include <stdlib.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
struct _hash_set;
typedef struct _hash_set hash_set_t;
hash_set_t *hash_set_create(const double load_factor, const int fail_fast, const size_t initial_capacity);
void hash_set_destroy(hash_set_t *const instance);
int hash_set_insert(hash_set_t *const instance, const uint64_t value);
int hash_set_contains(hash_set_t *const instance, const uint64_t value);
size_t hash_set_current_size(hash_set_t *const instance);
#ifdef __cplusplus
}
#endif
#endif

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#define _CRT_RAND_S 1
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "hash_set.h"
static uint64_t next_rand(void)
{
uint32_t a, b;
if (rand_s(&a) || rand_s(&b))
{
abort();
}
return (((uint64_t)a) << 32) | b;
}
int main()
{
hash_set_t *const set = hash_set_create(-1.0, 0, 0U);
if (!set)
{
puts("Allocation has failed!");
return EXIT_FAILURE;
}
clock_t now, next_update = clock();
for (;;)
{
const int ret = hash_set_insert(set, next_rand() & 0xFFFFFFFFFFFFFFllu);
if (ret != 1)
{
printf("Error! (%d)\n", ret);
break;
}
if ((now = clock()) >= next_update)
{
printf("%zu\n", hash_set_current_size(set));
next_update = now + (3U * CLOCKS_PER_SEC);
}
}
hash_set_destroy(set);
return EXIT_SUCCESS;
}