}
      // Position of first character is length of bitBuffer minus bitsPerChar.
      int bitOffset = (len + 1) * 8 - alphabet.bitsPerChar;
      int bitsProcessed = 0;
      while (bitsProcessed < len * 8) {
        int charIndex = (int) (bitBuffer >>> (bitOffset - bitsProcessed)) & alphabet.mask;
        target.append(alphabet.encode(charIndex));
        bitsProcessed += alphabet.bitsPerChar;