[PATCH 2/3] cached_object: learn empty blob

[Junio C Hamano <gitster@pobox.com>]

We have hardcoded an empty tree for a long time.  This teaches the code
about an empty blob object.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 sha1_file.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/sha1_file.c b/sha1_file.c
index d9e342e..1e5de12 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2002,6 +2002,15 @@ static struct cached_object empty_tree = {
 	0
 };
 
+static struct cached_object empty_blob = {
+	/* empty blob sha1: e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 */
+	"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b"
+	"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91",
+	OBJ_BLOB,
+	"",
+	0
+};
+
 static struct cached_object *find_cached_object(const unsigned char *sha1)
 {
 	int i;
@@ -2013,6 +2022,8 @@ static struct cached_object *find_cached_object(const unsigned char *sha1)
 	}
 	if (!hashcmp(sha1, empty_tree.sha1))
 		return &empty_tree;
+	if (!hashcmp(sha1, empty_blob.sha1))
+		return &empty_blob;
 	return NULL;
 }
 
-- 
1.6.0.51.g078ae