diff options
Diffstat (limited to 'hashmap.c')
| -rw-r--r-- | hashmap.c | 29 |
1 files changed, 28 insertions, 1 deletions
@@ -50,6 +50,23 @@ unsigned int memihash(const void *buf, size_t len) return hash; } +/* + * Incoporate another chunk of data into a memihash + * computation. + */ +unsigned int memihash_cont(unsigned int hash_seed, const void *buf, size_t len) +{ + unsigned int hash = hash_seed; + unsigned char *ucbuf = (unsigned char *) buf; + while (len--) { + unsigned int c = *ucbuf++; + if (c >= 'a' && c <= 'z') + c -= 'a' - 'A'; + hash = (hash * FNV32_PRIME) ^ c; + } + return hash; +} + #define HASHMAP_INITIAL_SIZE 64 /* grow / shrink by 2^2 */ #define HASHMAP_RESIZE_BITS 2 @@ -87,11 +104,19 @@ static inline unsigned int bucket(const struct hashmap *map, return key->hash & (map->tablesize - 1); } +int hashmap_bucket(const struct hashmap *map, unsigned int hash) +{ + return hash & (map->tablesize - 1); +} + static void rehash(struct hashmap *map, unsigned int newsize) { unsigned int i, oldsize = map->tablesize; struct hashmap_entry **oldtable = map->table; + if (map->disallow_rehash) + return; + alloc_table(map, newsize); for (i = 0; i < oldsize; i++) { struct hashmap_entry *e = oldtable[i]; @@ -124,7 +149,9 @@ void hashmap_init(struct hashmap *map, hashmap_cmp_fn equals_function, size_t initial_size) { unsigned int size = HASHMAP_INITIAL_SIZE; - map->size = 0; + + memset(map, 0, sizeof(*map)); + map->cmpfn = equals_function ? equals_function : always_equal; /* calculate initial table size and allocate the table */ |