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#include "structures/hashmap.h"
#include <stdlib.h>
#include <string.h>
#include "utils/memory.h"
HashMap *hashmap_new(
size_t key_size,
size_t val_size,
uint32_t (*hash)(void *key),
int (*compare)(void *key1, void *key2),
void (*key_cleanup)(void *key),
void (*val_cleanup)(void *val)
) {
HashMap *map = safe_malloc(sizeof(HashMap));
// initialize NULLs
memset(map->table, 0, HASHMAP_TABLE_SIZE * sizeof(HashMapNode *));
map->key_size = key_size;
map->val_size = val_size;
map->hash = hash;
map->compare = compare;
map->key_cleanup = key_cleanup;
map->val_cleanup = val_cleanup;
return map;
}
void hashmap_put(HashMap *map, void *key, void *val) {
size_t key_hash = map->hash(key) % HASHMAP_TABLE_SIZE;
HashMapNode *node = map->table[key_hash];
// check if it exists
while (node) {
// if it exists - update node
if (map->compare(key, node->key)) {
// ensure no hanging memory allocation
if (map->val_cleanup) {
map->val_cleanup(node->val);
}
memcpy(node->val, val, map->val_size);
return;
}
node = node->next;
}
// if it doesn't exist - create new node
HashMapNode *new_node = safe_malloc(sizeof(HashMapNode));
new_node->key = safe_malloc(map->key_size);
new_node->val = safe_malloc(map->val_size);
memcpy(new_node->key, key, map->key_size);
memcpy(new_node->val, val, map->val_size);
// put in front of the linked list
new_node->next = map->table[key_hash];
map->table[key_hash] = new_node;
}
void *hashmap_get(HashMap *map, void *key) {
size_t key_hash = map->hash(key) % HASHMAP_TABLE_SIZE;
HashMapNode *node = map->table[key_hash];
// check if it exists
while (node) {
// if it exists - return the value pointer
if (map->compare(key, node->key)) {
return node->val;
}
node = node->next;
}
// if it doesn't exist - return NULL
return NULL;
}
void free_node_without_next(HashMap *map, HashMapNode *node) {
if (map->key_cleanup) {
map->key_cleanup(node->key);
}
if (map->val_cleanup) {
map->val_cleanup(node->val);
}
free(node->key);
free(node->val);
free(node);
}
void hashmap_delete(HashMap *map, void *key) {
size_t key_hash = map->hash(key) % HASHMAP_TABLE_SIZE;
HashMapNode **p_node = &map->table[key_hash];
// check if it exists
while (*p_node) {
// if it exists - delete it
if (map->compare(key, (*p_node)->key)) {
HashMapNode *next = (*p_node)->next;
free_node_without_next(map, *p_node);
*p_node = next;
return;
}
p_node = &(*p_node)->next;
}
}
void hashmap_free(HashMap *map) {
if (!map)
return;
for (size_t i = 0; i < HASHMAP_TABLE_SIZE; i++) {
HashMapNode *curr = map->table[i];
while (curr) {
HashMapNode *next = curr->next;
free_node_without_next(map, curr);
curr = next;
}
}
free(map);
}
// FNV hash
uint32_t hash_str(void *str) {
char *s = str;
uint32_t hash = 2166136261;
while (*s) {
hash ^= (unsigned char)*s;
hash *= 16777619;
s++;
}
return hash;
}
int compare_strs(void *str1, void *str2) {
char *s1 = str1;
char *s2 = str2;
return !strcmp(s1, s2);
}
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