// Huffman data.
var errShortHuffmanData = FormatError("short Huffman data")

// ensureNBits reads bytes from the byte buffer to ensure that d.bits.n is at
// least n. For best performance (avoiding function calls inside hot loops),
// the caller is the one responsible for first checking that d.bits.n < n.
func (d *decoder) ensureNBits(n int32) error {
	for {
		c, err := d.readByteStuffedByte()
		if err != nil {