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Extract the read_index_data() function from attr.c and move it to read-cache.c; rename it to read_blob_data_from_index() and update the function signature of it to align better with index/cache API functions. This allows for reusing the function in convert.c later. Signed-off-by: Lukas Fleischer <git@cryptocrack.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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