sha1_file: introduce an nth_packed_object_oid function

diff --git a/cache.h b/cache.h
index e03a672d1542a71a27aaf98d3dae9d2588ca4b8c..29e59cbb56c9c51d1a0da3e3bbb1d66807e79a0c 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1608,6 +1608,12 @@ extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
  * error.
  */
 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
+/*
+ * Like nth_packed_object_sha1, but write the data into the object specified by
+ * the the first argument.  Returns the first argument on success, and NULL on
+ * error.
+ */
+extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
 
 /*
  * Return the offset of the nth object within the specified packfile.