builtin/hash-object: convert to struct object_id

Signed-off-by: Patryk Obara <patryk.obara@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/hash-object.c

@@ -16,7 +16,7 @@
  * needs to bypass the data conversion performed by, and the type
  * limitation imposed by, index_fd() and its callees.
  */
-static int hash_literally(unsigned char *sha1, int fd, const char *type, unsigned flags)
+static int hash_literally(struct object_id *oid, int fd, const char *type, unsigned flags)
 {
 	struct strbuf buf = STRBUF_INIT;
 	int ret;
@@ -24,7 +24,7 @@ static int hash_literally(unsigned char *sha1, int fd, const char *type, unsigne
 	if (strbuf_read(&buf, fd, 4096) < 0)
 		ret = -1;
 	else
-		ret = hash_sha1_file_literally(buf.buf, buf.len, type, sha1, flags);
+		ret = hash_sha1_file_literally(buf.buf, buf.len, type, oid->hash, flags);
 	strbuf_release(&buf);
 	return ret;
 }
@@ -33,16 +33,16 @@ static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
 		    int literally)
 {
 	struct stat st;
-	unsigned char sha1[20];
+	struct object_id oid;
 
 	if (fstat(fd, &st) < 0 ||
 	    (literally
-	     ? hash_literally(sha1, fd, type, flags)
-	     : index_fd(sha1, fd, &st, type_from_string(type), path, flags)))
+	     ? hash_literally(&oid, fd, type, flags)
+	     : index_fd(oid.hash, fd, &st, type_from_string(type), path, flags)))
 		die((flags & HASH_WRITE_OBJECT)
 		    ? "Unable to add %s to database"
 		    : "Unable to hash %s", path);
-	printf("%s\n", sha1_to_hex(sha1));
+	printf("%s\n", oid_to_hex(&oid));
 	maybe_flush_or_die(stdout, "hash to stdout");
 }