*/
public class PacDataInputStream {

    private final DataInputStream dis;
    private final int size;

    /**
     * Constructs a PAC data input stream from the given input stream.
     * @param in the underlying input stream
     * @throws IOException if an I/O error occurs
     */
    public PacDataInputStream(final InputStream in) throws IOException {

     */
    public Pac(byte[] data, Map<Integer, KerberosKey> keys) throws PACDecodingException {
        byte[] checksumData = data.clone();
        try {
            PacDataInputStream pacStream = new PacDataInputStream(new DataInputStream(new ByteArrayInputStream(data)));

            if (data.length <= 8) {
                throw new PACDecodingException("Empty PAC");
            }

     * @throws PACDecodingException if the data is malformed or cannot be parsed
     */
    public PacSignature(final byte[] data) throws PACDecodingException {
        try {
            final PacDataInputStream bufferStream = new PacDataInputStream(new DataInputStream(new ByteArrayInputStream(data)));
            this.type = bufferStream.readInt();
            switch (this.type) {
            case KERB_CHECKSUM_HMAC_MD5:

     * @throws PACDecodingException if the data is malformed or invalid
     */
    public PacLogonInfo(final byte[] data) throws PACDecodingException {
        try {
            final PacDataInputStream pacStream = new PacDataInputStream(new DataInputStream(new ByteArrayInputStream(data)));

            // Skip firsts
            pacStream.skipBytes(20);

            // Dates
            this.logonTime = pacStream.readFiletime();