Andrew's git - gitweb.git/blob

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