teach sha1_object_info_extended a "disk_size" query
Using sha1_object_info_extended, a caller can find out the type of an object, its size, and information about where it is stored. In addition to the object's "true" size, it can also be useful to know the size that the object takes on disk (e.g., to generate statistics about which refs consume space). This patch adds a "disk_sizep" field to "struct object_info", and fills it in during sha1_object_info_extended if it is non-NULL. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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