Subject: [PATCH 22/23] midx: use midx to find ref-deltas

From: Derrick Stolee <[email-masked]>
Date: Thu, 7 Jun 2018 10:03:37 -0400

Signed-off-by: Derrick Stolee <[email-masked]>
---
 midx.c     |  2 +-
 midx.h     |  1 +
 packfile.c | 15 +++++++++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/midx.c b/midx.c
index 3242646fe0..e46f392fa4 100644
--- a/midx.c
+++ b/midx.c
@@ -214,7 +214,7 @@ struct object_id *nth_midxed_object_oid(struct object_id *oid,
 	return oid;
 }
 
-static off_t nth_midxed_offset(struct midxed_git *m, uint32_t pos)
+off_t nth_midxed_offset(struct midxed_git *m, uint32_t pos)
 {
 	const unsigned char *offset_data;
 	uint32_t offset32;
diff --git a/midx.h b/midx.h
index c1db58d8c4..6996b5ff6b 100644
--- a/midx.h
+++ b/midx.h
@@ -9,6 +9,7 @@
 
 struct midxed_git *load_midxed_git(const char *object_dir);
 int bsearch_midx(const struct object_id *oid, struct midxed_git *m, uint32_t *result);
+off_t nth_midxed_offset(struct midxed_git *m, uint32_t n);
 struct object_id *nth_midxed_object_oid(struct object_id *oid,
 					struct midxed_git *m,
 					uint32_t n);
diff --git a/packfile.c b/packfile.c
index 479cb69b9f..9b814c89c7 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1794,6 +1794,21 @@ off_t find_pack_entry_one(const unsigned char *sha1,
 	uint32_t result;
 
 	if (!index) {
+		/*
+		 * If we have a MIDX, then we want to
+		 * check the MIDX for the offset instead.
+		 */
+		struct midxed_git *m;
+
+		for (m = get_midxed_git(the_repository); m; m = m->next) {
+			if (midx_contains_pack(m, p->pack_name)) {
+				if (bsearch_midx(&oid, m, &result))
+					return nth_midxed_offset(m, result);
+
+				break;
+			}
+		}
+
 		if (open_pack_index(p))
 			return 0;
 	}
-- 
2.18.0.rc1