Function unpack_entry

packfile.c:1784–2000

};

void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
		   enum object_type *final_type, size_t *final_size)
{
	struct pack_window *w_curs = NULL;
	off_t curpos = obj_offset;
	void *data = NULL;
	size_t size;
	enum object_type type;
	struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
	struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
	int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
	int base_from_cache = 0;

	prepare_repo_settings(p->repo);

	write_pack_access_log(p, obj_offset);

	/* PHASE 1: drill down to the innermost base object */
	for (;;) {
		off_t base_offset;
		int i;
		struct delta_base_cache_entry *ent;

		ent = get_delta_base_cache_entry(p, curpos);
		if (ent) {
			type = ent->type;
			data = ent->data;
			size = ent->size;
			detach_delta_base_cache_entry(ent);
			base_from_cache = 1;
			break;
		}

		if (do_check_packed_object_crc && p->index_version > 1) {
			uint32_t pack_pos, index_pos;
			off_t len;

			if (offset_to_pack_pos(p, obj_offset, &pack_pos) < 0) {
				error("could not find object at offset %"PRIuMAX" in pack %s",
				      (uintmax_t)obj_offset, p->pack_name);
				data = NULL;
				goto out;
			}

			len = pack_pos_to_offset(p, pack_pos + 1) - obj_offset;
			index_pos = pack_pos_to_index(p, pack_pos);
			if (check_pack_crc(p, &w_curs, obj_offset, len, index_pos)) {
				struct object_id oid;
				nth_packed_object_id(&oid, p, index_pos);
				error("bad packed object CRC for %s",
				      oid_to_hex(&oid));
				mark_bad_packed_object(p, &oid);
				data = NULL;
				goto out;
			}
		}

		type = unpack_object_header(p, &w_curs, &curpos, &size);