if r == r1 {
					return 0
				}
			}
		}
		return noMatch

	case 2:
		if r >= rune[0] && r <= rune[1] {
			return 0
		}
		return noMatch

	case 4, 6, 8:
		// Linear search for a few pairs.
		// Should handle ASCII well.
		for j := 0; j < len(rune); j += 2 {
			if r < rune[j] {
				return noMatch
			}
			if r <= rune[j+1] {
				return j / 2
			}
		}

			// No UTF-8 or non-ASCII allowed in tokens.
			return false
		}
		if lowerASCII(byte(b)) != lowerASCII(t2[i]) {
			return false
		}
	}
	return true
}

// isLWS reports whether b is linear white space, according
// to http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
//
//	LWS            = [CRLF] 1*( SP | HT )
func isLWS(b byte) bool { return b == ' ' || b == '\t' }

	// will make any future Write calls return errClosed
	err error
	// table is the hash table from 20-bit keys to 12-bit values. Each table
	// entry contains key<<12|val and collisions resolve by linear probing.
	// The keys consist of a 12-bit code prefix and an 8-bit byte suffix.
	// The values are a 12-bit code.
	table [tableSize]uint32
}

// writeLSB writes the code c for "Least Significant Bits first" data.