| 1 | #ifndef HASHMAP_H
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| 2 | #define HASHMAP_H
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| 3 |
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| 4 | /*
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| 5 | * Generic implementation of hash-based key-value mappings.
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| 6 | * See Documentation/technical/api-hashmap.txt.
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| 7 | */
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| 8 |
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| 9 | /* FNV-1 functions */
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| 10 |
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| 11 | extern unsigned int strhash(const char *buf);
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| 12 | extern unsigned int strihash(const char *buf);
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| 13 | extern unsigned int memhash(const void *buf, size_t len);
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| 14 | extern unsigned int memihash(const void *buf, size_t len);
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| 15 |
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| 16 | /* data structures */
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| 17 |
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| 18 | struct hashmap_entry {
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| 19 | struct hashmap_entry *next;
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| 20 | unsigned int hash;
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| 21 | };
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| 22 |
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| 23 | typedef int (*hashmap_cmp_fn)(const void *entry, const void *entry_or_key,
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| 24 | const void *keydata);
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| 25 |
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| 26 | struct hashmap {
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| 27 | struct hashmap_entry **table;
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| 28 | hashmap_cmp_fn cmpfn;
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| 29 | unsigned int size, tablesize, grow_at, shrink_at;
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| 30 | };
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| 31 |
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| 32 | struct hashmap_iter {
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| 33 | struct hashmap *map;
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| 34 | struct hashmap_entry *next;
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| 35 | unsigned int tablepos;
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| 36 | };
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| 37 |
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| 38 | /* hashmap functions */
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| 39 |
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| 40 | extern void hashmap_init(struct hashmap *map, hashmap_cmp_fn equals_function,
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| 41 | size_t initial_size);
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| 42 | extern void hashmap_free(struct hashmap *map, int free_entries);
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| 43 |
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| 44 | /* hashmap_entry functions */
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| 45 |
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| 46 | static inline void hashmap_entry_init(void *entry, unsigned int hash)
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| 47 | {
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| 48 | struct hashmap_entry *e = entry;
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| 49 | e->hash = hash;
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| 50 | e->next = NULL;
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| 51 | }
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| 52 | extern void *hashmap_get(const struct hashmap *map, const void *key,
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| 53 | const void *keydata);
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| 54 | extern void *hashmap_get_next(const struct hashmap *map, const void *entry);
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| 55 | extern void hashmap_add(struct hashmap *map, void *entry);
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| 56 | extern void *hashmap_put(struct hashmap *map, void *entry);
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| 57 | extern void *hashmap_remove(struct hashmap *map, const void *key,
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| 58 | const void *keydata);
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| 59 |
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| 60 | /* hashmap_iter functions */
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| 61 |
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| 62 | extern void hashmap_iter_init(struct hashmap *map, struct hashmap_iter *iter);
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| 63 | extern void *hashmap_iter_next(struct hashmap_iter *iter);
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| 64 | static inline void *hashmap_iter_first(struct hashmap *map,
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| 65 | struct hashmap_iter *iter)
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| 66 | {
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| 67 | hashmap_iter_init(map, iter);
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| 68 | return hashmap_iter_next(iter);
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| 69 | }
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| 70 |
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| 71 | #endif
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