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Document why header parsing won't exceed a window.
When we parse the object header or the delta base reference we don't bother to loop over use_pack() calls. The reason we don't need to bother with calling use_pack for each byte accessed is that use_pack will always promise us at least 20 bytes (really the hash size) after the offset. This promise from use_pack simplifies a lot of code in the header parsing logic, as well as helps out the zlib library by ensuring there's always some data for it to consume during an inflate call. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
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