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packed_object_info(): use object_id internally for delta base

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The previous commit changed the public interface of packed_object_info()
to return a struct object_id rather than a bare hash. That enables us to
convert our internal helper, as well. We can use nth_packed_object_id()
directly for OFS_DELTA, but we'll still have to use oidread() to pull
the hash for a REF_DELTA out of the packfile.

There should be no additional cost, since we're copying directly into
the object_id the caller provided us (just as we did before; it's just
happening now via nth_packed_object_id()).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-02-23 23:37:31 -05:00 committed by Junio C Hamano
parent b99b6bcc57
commit 6ac9760a30
1 changed files with 15 additions and 17 deletions
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24
packfile.c
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@ -1225,30 +1225,32 @@ off_t get_delta_base(struct packed_git *p,
* the final object lookup), but more expensive for OFS deltas (we
* have to load the revidx to convert the offset back into a sha1).
*/
static const unsigned char *get_delta_base_sha1(struct packed_git *p,
static int get_delta_base_oid(struct packed_git *p,
struct pack_window **w_curs,
off_t curpos,
struct object_id *oid,
enum object_type type,
off_t delta_obj_offset)
{
if (type == OBJ_REF_DELTA) {
unsigned char *base = use_pack(p, w_curs, curpos, NULL);
return base;
oidread(oid, base);
return 0;
} else if (type == OBJ_OFS_DELTA) {
struct revindex_entry *revidx;
off_t base_offset = get_delta_base(p, w_curs, &curpos,
type, delta_obj_offset);
if (!base_offset)
return NULL;
return -1;
revidx = find_pack_revindex(p, base_offset);
if (!revidx)
return NULL;
return -1;
return nth_packed_object_sha1(p, revidx->nr);
return nth_packed_object_id(oid, p, revidx->nr);
} else
return NULL;
return -1;
}
static int retry_bad_packed_offset(struct repository *r,
@ -1558,16 +1560,12 @@ int packed_object_info(struct repository *r, struct packed_git *p,
if (oi->delta_base_oid) {
if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
const unsigned char *base;
base = get_delta_base_sha1(p, &w_curs, curpos,
type, obj_offset);
if (!base) {
if (get_delta_base_oid(p, &w_curs, curpos,
oi->delta_base_oid,
type, obj_offset) < 0) {
type = OBJ_BAD;
goto out;
}
hashcpy(oi->delta_base_oid->hash, base);
} else
oidclr(oi->delta_base_oid);
}