bufferIndex += 4;
        bufferIndex += 4; // Reserved2

        this.inputData = createInputDecodable();
        this.outputData = this.outputBuffer == null ? createOutputDecodable() : null;

        if (this.inputData != null) {
            this.inputData.decode(buffer, inputOffset, inputCount);
        }
        bufferIndex = Math.max(inputOffset + inputCount, bufferIndex);

        this.maxOutputResponse = maxOutputResponse;
    }

    /**
     * Set the input data for the IOCTL request
     * @param inputData the inputData to set
     */
    public void setInputData(final Encodable inputData) {
        this.inputData = inputData;
    }

    /**
     * Set the output data for the IOCTL request
     * @param outputData the outputData to set
     */

    private final ImmutableMap<E, Integer> inputSet;
    private final int mask;

    SubSet(ImmutableMap<E, Integer> inputSet, int mask) {
      this.inputSet = inputSet;
      this.mask = mask;
    }

    @Override
    public Iterator<E> iterator() {
      return new UnmodifiableIterator<E>() {
        final ImmutableList<E> elements = inputSet.keySet().asList();
        int remainingSetBits = mask;