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hashmap: add simplified hashmap_get_from_hash() API

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Hashmap entries are typically looked up by just a key. The hashmap_get()
API expects an initialized entry structure instead, to support compound
keys. This flexibility is currently only needed by find_dir_entry() in
name-hash.c (and compat/win32/fscache.c in the msysgit fork). All other
(currently five) call sites of hashmap_get() have to set up a near emtpy
entry structure, resulting in duplicate code like this:

  struct hashmap_entry keyentry;
  hashmap_entry_init(&keyentry, hash(key));
  return hashmap_get(map, &keyentry, key);

Add a hashmap_get_from_hash() API that allows hashmap lookups by just
specifying the key and its hash code, i.e.:

  return hashmap_get_from_hash(map, hash(key), key);

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karsten Blees
2014-07-03 00:22:11 +02:00
committed by Junio C Hamano
parent aa420c48ea
commit ab73a9d119
6 changed files with 31 additions and 18 deletions
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8
hashmap.h
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@ -68,6 +68,14 @@ extern void *hashmap_put(struct hashmap *map, void *entry);
extern void *hashmap_remove(struct hashmap *map, const void *key,
const void *keydata);
static inline void *hashmap_get_from_hash(const struct hashmap *map,
unsigned int hash, const void *keydata)
{
struct hashmap_entry key;
hashmap_entry_init(&key, hash);
return hashmap_get(map, &key, keydata);
}
/* hashmap_iter functions */
extern void hashmap_iter_init(struct hashmap *map, struct hashmap_iter *iter);