pack-bitmap: read multi-pack bitmaps
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>
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 8a52362..e11d3ac 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1124,6 +1124,11 @@ static void write_reused_pack(struct hashfile *f)
break;
offset += ewah_bit_ctz64(word >> offset);
+ /*
+ * Can use bit positions directly, even for MIDX
+ * bitmaps. See comment in try_partial_reuse()
+ * for why.
+ */
write_reused_pack_one(pos + offset, f, &w_curs);
display_progress(progress_state, ++written);
}
