#include "commit.h"
 #include "cache.h"
 #include "tag.h"
-#include "delta.h"
 
 struct object **objs;
 int nr_objs;
 
 struct object *parse_object(const unsigned char *sha1)
 {
-       unsigned long mapsize;
-       void *map = map_sha1_file(sha1, &mapsize);
-       if (map) {
-               int is_delta;
+       unsigned long size;
+       char type[20];
+       void *buffer = read_sha1_file(sha1, type, &size);
+       if (buffer) {
                struct object *obj;
-               char type[100];
-               unsigned long size;
-               void *buffer = unpack_sha1_file(map, mapsize, type, &size);
-               munmap(map, mapsize);
-               if (!buffer)
-                       return NULL;
-               is_delta = !strcmp(type, "delta");
-               if (!is_delta && check_sha1_signature(sha1, buffer, size, type) < 0)
+               if (check_sha1_signature(sha1, buffer, size, type) < 0)
                        printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
-               if (is_delta) {
-                       struct delta *delta = lookup_delta(sha1);
-                       parse_delta_buffer(delta, buffer, size);
-                       obj = (struct object *) delta;
-               } else if (!strcmp(type, "blob")) {
+               if (!strcmp(type, "blob")) {
                        struct blob *blob = lookup_blob(sha1);
                        parse_blob_buffer(blob, buffer, size);
                        obj = &blob->object;