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Make the verify_pack_callback take a pointer to struct object_id. Change the pack checksum to use GIT_MAX_RAWSZ, even though it is not strictly an object ID. Doing so ensures resilience against future hash size changes, and allows us to remove hard-coded assumptions about how big the buffer needs to be. Also, use a union to convert the pointer from nth_packed_object_sha1 to to a pointer to struct object_id. This behavior is compatible with GCC and clang and explicitly sanctioned by C11. The alternatives are to just perform a cast, which would run afoul of strict aliasing rules, but should just work, and changing the pointer into an instance of struct object_id and copying the value. The latter operation could seriously bloat memory usage on fsck, which already uses a lot of memory on some repositories. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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