//	LWS            = [CRLF] 1*( SP | HT )
func isLWS(b byte) bool { return b == ' ' || b == '\t' }

// isCTL reports whether b is a control byte, according
// to http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
//
//	CTL            = <any US-ASCII control character
//	                 (octets 0 - 31) and DEL (127)>
func isCTL(b byte) bool {
	const del = 0x7f // a CTL
	return b < ' ' || b == del
}