f.rBuf.Reset(r)
	} else {
		// bufio.NewReader will not return r, as r does not implement flate.Reader, so it is not bufio.Reader.
		f.rBuf = bufio.NewReader(r)
	}
	f.r = f.rBuf
}

func fixedHuffmanDecoderInit() {
	fixedOnce.Do(func() {
		// These come from the RFC section 3.2.6.
		var bits [288]int
		for i := 0; i < 144; i++ {
			bits[i] = 8
		}
		for i := 144; i < 256; i++ {
			bits[i] = 9
		}