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[06/19] midx: teach `nth_bitmapped_pack()` about incremental MIDXs

Message ID 4e960edf8a1018b8425d4d6ae5bb3553bfd38023.1717715060.git.me@ttaylorr.com (mailing list archive)
State Accepted
Commit 60750e1eb967c8622e7140037ec018a87577132b
Headers show
Series midx: incremental multi-pack indexes, part one | expand

Commit Message

Taylor Blau June 6, 2024, 11:04 p.m. UTC 
In a similar fashion as in previous commits, teach the function
`nth_bitmapped_pack()` about incremental MIDXs by translating the given
`pack_int_id` from the concatenated lexical order to a MIDX-local
lexical position.

When accessing the containing MIDX's array of packs, use the local pack
ID. Likewise, when reading the 'BTMP' chunk, use the MIDX-local offset
when accessing the data within that chunk.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 midx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/midx.c b/midx.c
index cfab7f8113..cdc754af97 100644
--- a/midx.c
+++ b/midx.c
@@ -308,17 +308,19 @@  int prepare_midx_pack(struct repository *r, struct multi_pack_index *m,
 int nth_bitmapped_pack(struct repository *r, struct multi_pack_index *m,
 		       struct bitmapped_pack *bp, uint32_t pack_int_id)
 {
+	uint32_t local_pack_int_id = midx_for_pack(&m, pack_int_id);
+
 	if (!m->chunk_bitmapped_packs)
 		return error(_("MIDX does not contain the BTMP chunk"));
 
 	if (prepare_midx_pack(r, m, pack_int_id))
 		return error(_("could not load bitmapped pack %"PRIu32), pack_int_id);
 
-	bp->p = m->packs[pack_int_id];
+	bp->p = m->packs[local_pack_int_id];
 	bp->bitmap_pos = get_be32((char *)m->chunk_bitmapped_packs +
-				  MIDX_CHUNK_BITMAPPED_PACKS_WIDTH * pack_int_id);
+				  MIDX_CHUNK_BITMAPPED_PACKS_WIDTH * local_pack_int_id);
 	bp->bitmap_nr = get_be32((char *)m->chunk_bitmapped_packs +
-				 MIDX_CHUNK_BITMAPPED_PACKS_WIDTH * pack_int_id +
+				 MIDX_CHUNK_BITMAPPED_PACKS_WIDTH * local_pack_int_id +
 				 sizeof(uint32_t));
 	bp->pack_int_id = pack_int_id;