sbuffer

type Buffer interface {
	// Get the next slice of data. Will return at least "needed", but may return more.
	// The returned slice should not be used after Next or Used is called.
	// The returned slice may be shorter then needed if the inner read returns a short
	// read (for example, returns an io.EOF).
	Next(needed int) ([]byte, error)

	// Called after using the slice returned from Next. This frees
	// the underlying buffer for more data.
	Used(used int)
}