if z.OldDataDir == "" {
		zb0001Len--
		zb0001Mask |= 0x10
	}
	// variable map header, size zb0001Len
	err = en.Append(0x80 | uint8(zb0001Len))
	if err != nil {
		return
	}

	// skip if no fields are to be emitted
	if zb0001Len != 0 {
		// write "BaseOptions"
		err = en.Append(0xab, 0x42, 0x61, 0x73, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73)
		if err != nil {
			return
		}

                }
                if (addr.getAddress() instanceof NbtAddress) {
                    final int code = ((NbtAddress) addr.getAddress()).getNameType();
                    if (code == 0x1d || code == 0x1b) {
                        type = TYPE_WORKGROUP;
                        return type;
                    }
                }
                type = TYPE_SERVER;
            }
        }