Data Structures | |
struct | di_hash_table |
Hash table. More... | |
struct | di_hash_node |
Node of a hash table. More... | |
Defines | |
#define | HASH_TABLE_RESIZE(hash_table) |
#define | HASH_TABLE_MIN_SIZE 11 |
#define | HASH_TABLE_MAX_SIZE 13845163 |
#define | CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x))) |
Functions | |
di_hash_table * | di_hash_table_new (di_hash_func hash_func, di_equal_func key_equal_func) |
di_hash_table * | di_hash_table_new_full (di_hash_func hash_func, di_equal_func key_equal_func, di_destroy_notify key_destroy_func, di_destroy_notify value_destroy_func) |
void | di_hash_table_destroy (di_hash_table *hash_table) |
void | di_hash_table_insert (di_hash_table *hash_table, void *key, void *value) |
void * | di_hash_table_lookup (di_hash_table *hash_table, const void *key) |
void | di_hash_table_foreach (di_hash_table *hash_table, di_hfunc *func, void *user_data) |
di_ksize_t | di_hash_table_size (di_hash_table *hash_table) |
static void | internal_di_hash_table_resize (di_hash_table *hash_table) |
static di_hash_node ** | internal_di_hash_table_lookup_node (di_hash_table *hash_table, const void *key) |
static di_hash_node * | internal_di_hash_node_new (di_hash_table *hash_table, void *key, void *value) |
static void | internal_di_hash_node_destroy (di_hash_node *hash_node, di_destroy_notify key_destroy_func, di_destroy_notify value_destroy_func) __attribute__((unused)) |
static void | internal_di_hash_nodes_destroy (di_hash_node *hash_node, di_destroy_notify key_destroy_func, di_destroy_notify value_destroy_func) |
#define CLAMP | ( | x, | |||
low, | |||||
high | ) | (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x))) |
For internal use only.
x | value | |
low | low bound | |
high | high bound |
#define HASH_TABLE_MAX_SIZE 13845163 |
For internal use only.
The maximal hash table size
#define HASH_TABLE_MIN_SIZE 11 |
For internal use only.
The minimal hash table size
#define HASH_TABLE_RESIZE | ( | hash_table | ) |
Value:
if ((hash_table->size >= 3 * hash_table->nnodes && \ hash_table->size > HASH_TABLE_MIN_SIZE) || \ (3 * hash_table->size <= hash_table->nnodes && \ hash_table->size < HASH_TABLE_MAX_SIZE)) \ internal_di_hash_table_resize (hash_table);
For internal use only.
Defines if a resize is necessary
hash_table | a di_hash_table |
void di_hash_table_destroy | ( | di_hash_table * | hash_table | ) |
Destroys the di_hash_table. If keys and/or values are dynamically allocated, you should either free them first or create the di_hash_table using di_hash_table_new_full. In the latter case the destroy functions you supplied will be called on all keys and values before destroying the di_hash_table.
hash_table | a di_hash_table. |
00138 { 00139 size_t i; 00140 00141 for (i = 0; i < hash_table->size; i++) 00142 internal_di_hash_nodes_destroy (hash_table->nodes[i], hash_table->key_destroy_func, hash_table->value_destroy_func); 00143 00144 di_mem_chunk_destroy (hash_table->mem_chunk); 00145 00146 di_free (hash_table->nodes); 00147 di_free (hash_table); 00148 }
void di_hash_table_foreach | ( | di_hash_table * | hash_table, | |
di_hfunc * | func, | |||
void * | user_data | |||
) |
Calls the given function for each of the key/value pairs in the di_hash_table. The function is passed the key and value of each pair, and the given user_data parameter.
hash_table | a di_hash_table. | |
func | the function to call for each key/value pair. | |
user_data | user data to pass to the function. |
00250 { 00251 di_hash_node *node; 00252 size_t i; 00253 00254 for (i = 0; i < hash_table->size; i++) 00255 for (node = hash_table->nodes[i]; node; node = node->next) 00256 func (node->key, node->value, user_data); 00257 }
void di_hash_table_insert | ( | di_hash_table * | hash_table, | |
void * | key, | |||
void * | value | |||
) |
Inserts a new key and value into a di_hash_table.
If the key already exists in the di_hash_table its current value is replaced with the new value. If you supplied a value_destroy_func when creating the di_hash_table, the old value is freed using that function. If you supplied a key_destroy_func when creating the di_hash_table, the passed key is freed using that function.
hash_table | a di_hash_table. | |
key | a key to insert. | |
value | the value to associate with the key. |
00182 { 00183 di_hash_node **node; 00184 00185 node = internal_di_hash_table_lookup_node (hash_table, key); 00186 00187 if (*node) 00188 { 00189 if (hash_table->key_destroy_func) 00190 hash_table->key_destroy_func (key); 00191 00192 if (hash_table->value_destroy_func) 00193 hash_table->value_destroy_func ((*node)->value); 00194 00195 (*node)->value = value; 00196 } 00197 else 00198 { 00199 *node = internal_di_hash_node_new (hash_table, key, value); 00200 hash_table->nnodes++; 00201 HASH_TABLE_RESIZE (hash_table); 00202 } 00203 }
void* di_hash_table_lookup | ( | di_hash_table * | hash_table, | |
const void * | key | |||
) |
Looks up a key in a di_hash_table.
hash_table | a di_hash_table, | |
key | the key to look up. |
00173 { 00174 di_hash_node *node; 00175 00176 node = *internal_di_hash_table_lookup_node (hash_table, key); 00177 00178 return node ? node->value : NULL; 00179 }
di_hash_table* di_hash_table_new | ( | di_hash_func | hash_func, | |
di_equal_func | key_equal_func | |||
) |
Creates a new di_hash_table.
hash_func | a function to create a hash value from a key. Hash values are used to determine where keys are stored within the di_hash_table data structure. | |
key_equal_func | a function to check two keys for equality. This is used when looking up keys in the di_hash_table. |
00112 { 00113 return di_hash_table_new_full (hash_func, key_equal_func, NULL, NULL); 00114 }
di_hash_table* di_hash_table_new_full | ( | di_hash_func | hash_func, | |
di_equal_func | key_equal_func, | |||
di_destroy_notify | key_destroy_func, | |||
di_destroy_notify | value_destroy_func | |||
) |
Creates a new di_hash_table like di_hash_table_new and allows to specify functions to free the memory allocated for the key and value that get called when removing the entry from the di_hash_table
hash_func | a function to create a hash value from a key. Hash values are used to determine where keys are stored within the di_hash_table data structure. | |
key_equal_func | a function to check two keys for equality. This is used when looking up keys in the di_hash_table. | |
key_destroy_func | a function to free the memory allocated for the key used when removing the entry from the di_hash_table or NULL if you don't want to supply such a function. | |
value_destroy_func | a function to free the memory allocated for the value used when removing the entry from the di_hash_table or NULL if you don't want to supply such a function. |
00117 { 00118 di_hash_table *hash_table; 00119 size_t i; 00120 00121 hash_table = di_new (di_hash_table, 1); 00122 hash_table->size = HASH_TABLE_MIN_SIZE; 00123 hash_table->nnodes = 0; 00124 hash_table->mem_chunk = di_mem_chunk_new (sizeof (di_hash_node), 4096); 00125 hash_table->hash_func = hash_func; 00126 hash_table->key_equal_func = key_equal_func; 00127 hash_table->key_destroy_func = key_destroy_func; 00128 hash_table->value_destroy_func = value_destroy_func; 00129 hash_table->nodes = di_new (di_hash_node*, hash_table->size); 00130 00131 for (i = 0; i < hash_table->size; i++) 00132 hash_table->nodes[i] = NULL; 00133 00134 return hash_table; 00135 }
di_ksize_t di_hash_table_size | ( | di_hash_table * | hash_table | ) |
Returns the number of elements contained in the di_hash_table.
hash_table | a di_hash_table. |
00260 { 00261 return hash_table->nnodes; 00262 }