case 1:
		return fileDel(data)

}
type FileDel struct {
	Del      Atom
	Contents Atom
	Path     string
	Encoding string

func (f FileDel) atoms() []Atom {
	if f.Contents == nil {
		return []Atom{f.Del}
	}
	return []Atom{f.Del, f.Contents}
}
func fileDel(data []byte) ([]byte, FileDel, error) {
	var f FileDel
	data, _, err := tuple(
		assign(&f.Del, atom),
		assign(&f.Contents, mapValue(option(atom), func(p *Atom) Atom {
			if p == nil {
				return nil
			}
			return *p
		})),
		assign(&f.Path, toString(lengthData(uint64LE))),
		assign(&f.Encoding, mapValue(option(toString(lengthData(uint64LE))), func(p *string) string {
			if p == nil {
				return ""
			}
			return *p
		})),
	)(data)
	return data, f, err
}