* @throws IOException if an I/O error occurs
     */
    public Date readFiletime() throws IOException {
        Date date = null;

        final long last = readUnsignedInt();
        final long first = readUnsignedInt();
        if (first != 0x7fffffffL && last != 0xffffffffL) {
            final BigInteger lastBigInt = BigInteger.valueOf(last);
            final BigInteger firstBigInt = BigInteger.valueOf(first);

        byte[] data = new byte[] { (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF };
        PacDataInputStream pdis = createInputStream(data);
        assertEquals(0xFFFFFFFFL, pdis.readUnsignedInt());
    }

    @Test
    public void testReadFiletime() throws IOException {
        // A non-null date
        long time = System.currentTimeMillis();
        BigInteger filetime = BigInteger.valueOf(time)