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In C, it's easy for us to look up a hash algorithm structure by its offset by simply indexing the hash_algos array. However, in Rust, we sometimes need a pointer to pass to a C function, but we have our own hash algorithm abstraction. To get one from the other, let's provide a simple function that looks up the C structure from the offset and expose it in Rust. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>