return n, io.ErrUnexpectedEOF
	}
	if r.N <= 0 && err == nil {
		return n, io.EOF
	}
	return n, err
}

// readFromUntil reads from r into c.rawInput until c.rawInput contains
// at least n bytes or else returns an error.
func (c *Conn) readFromUntil(r io.Reader, n int) error {
	if c.rawInput.Len() >= n {
		return nil
	}
	needs := n - c.rawInput.Len()