* A file with this bit on as returned by {@code getAttributes()} is
     * a volume
     */
    public static final int ATTR_VOLUME = 0x08;
    /**
     * A file with this bit on as returned by {@code getAttributes()} is
     * a directory
     */
    public static final int ATTR_DIRECTORY = 0x10;
    /**
     * A file with this bit on as returned by {@code getAttributes()} or set

	// check for omitted fields
	zb0001Len := uint32(5)
	var zb0001Mask uint8 /* 5 bits */
	_ = zb0001Mask
	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 {