sclass HuffmanByteArray is BitIO {
  byte[] data;
  int[] histogram;
  HuffmanTree tree;
  
  settable bool magicCode;

  public void readWrite(BitHead head) {
    if (head.writeMode()) {
      histogram = byteHistogramArray(rawData);
      new HuffmanTreeMaker tm;
      var tree = tm.importByteHistogram(histogram);
      tree = tm!;
    }

    // Part 1 (magic code)
    if (magicCode)
      head.exchangeASCII("HUFF");
  
    // Part 2 (Huffman character tree)
    tree.readWrite(head);
  
    // Part 3 (text)
    
    if (head.writeMode()) {
      fOr (b : data)
        tree.writeCharacter(b, head);
      head.trailingBitCount();
    }
    
    if (head.readMode()) {
      
    }
  }
}