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cache: add a function to read an OID of a specific algorithm

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Currently, we always read a object ID of the current algorithm with
oidread.  However, once we start converting objects, we'll need to
consider what happens when we want to read an object ID of a specific
algorithm, such as the compatibility algorithm.  To make this easier,
let's define oidread_algop, which specifies which algorithm we should
use for our object ID, and define oidread in terms of it.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson 2023-10-01 21:40:17 -05:00 committed by Junio C Hamano
parent 867386d0c8
commit 095261a18d
1 changed files with 7 additions and 2 deletions
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9
hash.h
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@ -73,10 +73,15 @@ static inline void oidclr(struct object_id *oid)
oid->algo = hash_algo_by_ptr(the_hash_algo);
}
static inline void oidread_algop(struct object_id *oid, const unsigned char *hash, const struct git_hash_algo *algop)
{
memcpy(oid->hash, hash, algop->rawsz);
oid->algo = hash_algo_by_ptr(algop);
}
static inline void oidread(struct object_id *oid, const unsigned char *hash)
{
memcpy(oid->hash, hash, the_hash_algo->rawsz);
oid->algo = hash_algo_by_ptr(the_hash_algo);
oidread_algop(oid, hash, the_hash_algo);
}
static inline int is_empty_blob_sha1(const unsigned char *sha1)