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hash: add a function to lookup hash algorithm by length

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There are some cases, such as the dumb HTTP transport and bundles, where
we can only determine the hash algorithm in use by the length of the
object IDs. Provide a function that looks up the algorithm by length.

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
2019-02-19 00:05:17 +00:00
committed by Junio C Hamano
parent 9c9492e8aa
commit 95399788d1
2 changed files with 10 additions and 0 deletions
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8
sha1-file.c
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@ -189,6 +189,14 @@ int hash_algo_by_id(uint32_t format_id)
return GIT_HASH_UNKNOWN;
}
int hash_algo_by_length(int len)
{
int i;
for (i = 1; i < GIT_HASH_NALGOS; i++)
if (len == hash_algos[i].rawsz)
return i;
return GIT_HASH_UNKNOWN;
}
/*
* This is meant to hold a *small* number of objects that you would