1 files changed, 6 insertions, 0 deletions
diff --git a/hash-ll.h b/hash-ll.h
index b04fe12aef..faf6c292d2 100644
--- a/hash-ll.h
+++ b/hash-ll.h
@@ -341,6 +341,12 @@ static inline unsigned int oidhash(const struct object_id *oid)
 	return hash;
 }
 
+static inline int is_null_oid(const struct object_id *oid)
+{
+	static const unsigned char null_hash[GIT_MAX_RAWSZ];
+	return !memcmp(oid->hash, null_hash, GIT_MAX_RAWSZ);
+}
+
 const char *empty_tree_oid_hex(void);
 const char *empty_blob_oid_hex(void);