pack-objects: shrink z_delta_size field in struct object_entry
authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Sat, 14 Apr 2018 15:35:07 +0000 (17:35 +0200)
committerJunio C Hamano <gitster@pobox.com>
Mon, 16 Apr 2018 03:38:58 +0000 (12:38 +0900)
We only cache deltas when it's smaller than a certain limit. This limit
defaults to 1000 but save its compressed length in a 64-bit field.
Shrink that field down to 20 bits, so you can only cache 1MB deltas.
Larger deltas must be recomputed at when the pack is written down.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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