Add an option to struct object_info to suppress population of additional
information about a packed object if unneeded. This allows an
optimization in which sha1_object_info_extended() does not even need to
access the pack if no information besides provenance is requested. A
subsequent patch will make use of this optimization.
Signed-off-by: Jonathan Tan <jonathanta...@google.com>
---
cache.h | 1 +
sha1_file.c | 17 +++++++++++++----
streaming.c | 1 +
3 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/cache.h b/cache.h
index 7cf2ca466..2e1cc3fe2 100644
--- a/cache.h
+++ b/cache.h
@@ -1828,6 +1828,7 @@ struct object_info {
unsigned char *delta_base_sha1;
struct strbuf *typename;
void **contentp;
+ unsigned populate_u : 1;
/* Response */
enum {
diff --git a/sha1_file.c b/sha1_file.c
index 24f7a146e..68e3a3400 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -3020,6 +3020,13 @@ int sha1_object_info_extended(const unsigned char *sha1,
struct object_info *oi,
}
}
+ if (!oi->typep && !oi->sizep && !oi->disk_sizep &&
+ !oi->delta_base_sha1 && !oi->typename && !oi->contentp &&
+ !oi->populate_u) {
+ oi->whence = OI_PACKED;
+ return 0;
+ }
+
rtype = packed_object_info(e.p, e.offset, oi);
if (rtype < 0) {
mark_bad_packed_object(e.p, real);
@@ -3028,10 +3035,12 @@ int sha1_object_info_extended(const unsigned char
*sha1, struct object_info *oi,
oi->whence = OI_DBCACHED;
} else {
oi->whence = OI_PACKED;
- oi->u.packed.offset = e.offset;
- oi->u.packed.pack = e.p;
- oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
- rtype == OBJ_OFS_DELTA);
+ if (oi->populate_u) {
+ oi->u.packed.offset = e.offset;
+ oi->u.packed.pack = e.p;
+ oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
+ rtype == OBJ_OFS_DELTA);
+ }
}
return 0;
diff --git a/streaming.c b/streaming.c
index 9afa66b8b..deebc18a8 100644
--- a/streaming.c
+++ b/streaming.c
@@ -113,6 +113,7 @@ static enum input_source istream_source(const unsigned char
*sha1,
oi->typep = type;
oi->sizep = &size;
+ oi->populate_u = 1;
status = sha1_object_info_extended(sha1, oi, 0);
if (status < 0)
return stream_error;
--
2.13.1.611.g7e3b11ae1-goog
