hashmap: add simplified hashmap_get_from_hash() API
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>
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Junio C Hamano

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@ -118,6 +118,20 @@ hashmap_entry) that has at least been initialized with the proper hash code
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If an entry with matching hash code is found, `key` and `keydata` are passed
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to `hashmap_cmp_fn` to decide whether the entry matches the key.
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`void *hashmap_get_from_hash(const struct hashmap *map, unsigned int hash, const void *keydata)`::
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Returns the hashmap entry for the specified hash code and key data,
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or NULL if not found.
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+
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`map` is the hashmap structure.
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+
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`hash` is the hash code of the entry to look up.
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+
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If an entry with matching hash code is found, `keydata` is passed to
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`hashmap_cmp_fn` to decide whether the entry matches the key. The
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`entry_or_key` parameter points to a bogus hashmap_entry structure that
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should not be used in the comparison.
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`void *hashmap_get_next(const struct hashmap *map, const void *entry)`::
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Returns the next equal hashmap entry, or NULL if not found. This can be
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