func newHuffmanEncoder(size int) *huffmanEncoder {
	return &huffmanEncoder{codes: make([]hcode, size)}
}

// Generates a HuffmanCode corresponding to the fixed literal table.
func generateFixedLiteralEncoding() *huffmanEncoder {
	h := newHuffmanEncoder(maxNumLit)
	codes := h.codes
	var ch uint16
	for ch = 0; ch < maxNumLit; ch++ {
		var bits uint16
		var size uint16
		switch {
		case ch < 144: