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hashmap: factor out getting a hash code from a SHA1

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Copying the first bytes of a SHA1 is duplicated in six places,
however, the implications (the actual value would depend on the
endianness of the platform) is documented only once.

Add a properly documented API for this.

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 00:20:20 +02:00
committed by Junio C Hamano
parent 6f92e5ff3c
commit 039dc71a7c
8 changed files with 29 additions and 40 deletions
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11
khash.h
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@@ -320,19 +320,12 @@ static const double __ac_HASH_UPPER = 0.77;
code; \
} }
static inline khint_t __kh_oid_hash(const unsigned char *oid)
{
khint_t hash;
memcpy(&hash, oid, sizeof(hash));
return hash;
}
#define __kh_oid_cmp(a, b) (hashcmp(a, b) == 0)
KHASH_INIT(sha1, const unsigned char *, void *, 1, __kh_oid_hash, __kh_oid_cmp)
KHASH_INIT(sha1, const unsigned char *, void *, 1, sha1hash, __kh_oid_cmp)
typedef kh_sha1_t khash_sha1;
KHASH_INIT(sha1_pos, const unsigned char *, int, 1, __kh_oid_hash, __kh_oid_cmp)
KHASH_INIT(sha1_pos, const unsigned char *, int, 1, sha1hash, __kh_oid_cmp)
typedef kh_sha1_pos_t khash_sha1_pos;
#endif /* __AC_KHASH_H */