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pack-bitmap: prepare to read lookup table extension

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Earlier change teaches Git to write bitmap lookup table. But Git
does not know how to parse them.

Teach Git to parse the existing bitmap lookup table. The older
versions of Git are not affected by it. Those versions ignore the
lookup table.

Mentored-by: Taylor Blau <me@ttaylorr.com>
Co-Mentored-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
Signed-off-by: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Abhradeep Chakraborty
2022-08-14 16:55:10 +00:00
committed by Junio C Hamano
parent 76f14b777c
commit 28cd730680
3 changed files with 312 additions and 9 deletions
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9
pack-bitmap.h
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@ -23,6 +23,15 @@ struct bitmap_disk_header {
#define NEEDS_BITMAP (1u<<22)
/*
* The width in bytes of a single triplet in the lookup table
* extension:
* (commit_pos, offset, xor_row)
*
* whose fields ar 32-, 64-, 32- bits wide, respectively.
*/
#define BITMAP_LOOKUP_TABLE_TRIPLET_WIDTH (16)
enum pack_bitmap_opts {
BITMAP_OPT_FULL_DAG = 0x1,
BITMAP_OPT_HASH_CACHE = 0x4,