package tlv

import "io"

const (
	Default byte = iota
	Relay
	Author
	Kind
)

func ReadEntry(buf io.Reader) (typ uint8, value []byte) {
	var err error
	t := []byte{:1}
	if _, err = buf.Read(t); err != nil {
		return
	}
	typ = t[0]
	l := []byte{:1}
	if _, err = buf.Read(l); err != nil {
		return
	}
	length := int(l[0])
	value = []byte{:length}
	if _, err = buf.Read(value); err != nil {
		value = nil
	}
	return
}

func WriteEntry(buf io.Writer, typ uint8, value []byte) {
	buf.Write(append([]byte{typ, byte(len(value))}, value...))
}