return new OutputStream() {
        int bitBuffer = 0;
        int bitBufferLength = 0;
        int writtenChars = 0;

        @Override
        public void write(int b) throws IOException {
          bitBuffer <<= 8;
          bitBuffer |= b & 0xFF;
          bitBufferLength += 8;
          while (bitBufferLength >= alphabet.bitsPerChar) {