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pack-bitmap: read multi-pack bitmaps

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This prepares the code in pack-bitmap to interpret the new multi-pack
bitmaps described in Documentation/technical/bitmap-format.txt, which
mostly involves converting bit positions to accommodate looking them up
in a MIDX.

Note that there are currently no writers who write multi-pack bitmaps,
and that this will be implemented in the subsequent commit. Note also
that get_midx_checksum() and get_midx_filename() are made non-static so
they can be called from pack-bitmap.c.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2021-08-31 16:52:21 -04:00
committed by Junio C Hamano
parent a5f9f24aa0
commit 0f533c7284
7 changed files with 336 additions and 42 deletions
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4
midx.c
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@ -48,12 +48,12 @@ static uint8_t oid_version(void)
}
}
static const unsigned char *get_midx_checksum(struct multi_pack_index *m)
const unsigned char *get_midx_checksum(struct multi_pack_index *m)
{
return m->data + m->data_len - the_hash_algo->rawsz;
}
static char *get_midx_filename(const char *object_dir)
char *get_midx_filename(const char *object_dir)
{
return xstrfmt("%s/pack/multi-pack-index", object_dir);
}