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hex: default to the_hash_algo on zero algorithm value
There are numerous places in the codebase where we assume we can initialize data by zeroing all its bytes. However, when we do that with a struct object_id, it leaves the structure with a zero value for the algorithm, which is invalid. We could forbid this pattern and require that all struct object_id instances be initialized using oidclr, but this seems burdensome and it's unnatural to most C programmers. Instead, if the algorithm is zero, assume we wanted to use the default hash algorithm instead. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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