packet

type Interface interface {
	HeadIsNil() bool
	Bytes() []byte
	String() string
	//empty() bool
	Len() int
	//Cap() int
	//Truncate(n int)
	Reset()
	// tryGrowByReslice(n int) (int, bool)
	// grow(n int) int
	//Grow(n int)
	Write(p []byte) (n int, err error)
	WriteString(s string) (n int, err error)
}