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sha1_file: introduce an nth_packed_object_oid function

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There are places in the code where we would like to provide a struct
object_id *, yet read the hash directly from the pack.  Provide an
nth_packed_object_oid function that is similar to the
nth_packed_object_sha1 function.

In order to avoid a potentially invalid cast, nth_packed_object_oid
provides a variable into which to store the value, which it returns on
success; on error, it returns NULL, as nth_packed_object_sha1 does.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2017-02-21 23:47:34 +00:00
committed by Junio C Hamano
parent 43bc3b6cee
commit 068f85e313
2 changed files with 20 additions and 3 deletions
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6
cache.h
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@ -1608,6 +1608,12 @@ extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
* error.
*/
extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
/*
* Like nth_packed_object_sha1, but write the data into the object specified by
* the the first argument. Returns the first argument on success, and NULL on
* error.
*/
extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
/*
* Return the offset of the nth object within the specified packfile.