Function write_reused_pack_one

builtin/pack-objects.c:1097–1176

}

static void write_reused_pack_one(struct packed_git *reuse_packfile,
				  size_t pos, struct hashfile *out,
				  off_t pack_start,
				  struct pack_window **w_curs)
{
	off_t offset, next, cur;
	enum object_type type;
	size_t size;

	offset = pack_pos_to_offset(reuse_packfile, pos);
	next = pack_pos_to_offset(reuse_packfile, pos + 1);

	record_reused_object(offset,
			     offset - (hashfile_total(out) - pack_start));

	cur = offset;
	type = unpack_object_header(reuse_packfile, w_curs, &cur, &size);
	assert(type >= 0);

	if (type == OBJ_OFS_DELTA) {
		off_t base_offset;
		off_t fixup;

		unsigned char header[MAX_PACK_OBJECT_HEADER];
		unsigned len;

		base_offset = get_delta_base(reuse_packfile, w_curs, &cur, type, offset);
		assert(base_offset != 0);

		/* Convert to REF_DELTA if we must... */
		if (!allow_ofs_delta) {
			uint32_t base_pos;
			struct object_id base_oid;

			if (offset_to_pack_pos(reuse_packfile, base_offset, &base_pos) < 0)
				die(_("expected object at offset %"PRIuMAX" "
				      "in pack %s"),
				    (uintmax_t)base_offset,
				    reuse_packfile->pack_name);

			nth_packed_object_id(&base_oid, reuse_packfile,
					     pack_pos_to_index(reuse_packfile, base_pos));

			len = encode_in_pack_object_header(header, sizeof(header),
							   OBJ_REF_DELTA, size);
			hashwrite(out, header, len);
			hashwrite(out, base_oid.hash, the_hash_algo->rawsz);
			copy_pack_data(out, reuse_packfile, w_curs, cur, next - cur);
			return;
		}

		/* Otherwise see if we need to rewrite the offset... */
		fixup = find_reused_offset(offset) -
			find_reused_offset(base_offset);
		if (fixup) {
			unsigned char ofs_header[MAX_PACK_OBJECT_HEADER];
			unsigned i, ofs_len;
			off_t ofs = offset - base_offset - fixup;