}
	return &dw, nil
}

// NewWriterDict is like [NewWriter] but initializes the new
// [Writer] with a preset dictionary. The returned [Writer] behaves
// as if the dictionary had been written to it without producing
// any compressed output. The compressed data written to w
// can only be decompressed by a [Reader] initialized with the
// same dictionary.
func NewWriterDict(w io.Writer, level int, dict []byte) (*Writer, error) {

	if err != nil {
		t.Fatalf("NewWriter: %v", err)
	}
	w.Write([]byte(dict))
	w.Flush()
	b.Reset()
	w.Write([]byte(text))
	w.Close()

	var b1 bytes.Buffer
	w, _ = NewWriterDict(&b1, 5, []byte(dict))
	w.Write([]byte(text))
	w.Close()

	if !bytes.Equal(b1.Bytes(), b.Bytes()) {
		t.Fatalf("writer wrote %q want %q", b1.Bytes(), b.Bytes())
	}
}

// with a preset dictionary. The returned [Reader] behaves as if
// the uncompressed data stream started with the given dictionary,
// which has already been read. NewReaderDict is typically used
// to read data compressed by NewWriterDict.
//
// The ReadCloser returned by NewReaderDict also implements [Resetter].
func NewReaderDict(r io.Reader, dict []byte) io.ReadCloser {
	fixedHuffmanDecoderInit()

	var f decompressor
	f.makeReader(r)