@GwtIncompatible
final class CharSequenceReader extends Reader {

  private @Nullable CharSequence seq;
  private int pos;
  private int mark;

  /** Creates a new reader wrapping the given character sequence. */
  public CharSequenceReader(CharSequence seq) {
    this.seq = checkNotNull(seq);
  }

  private void checkOpen() throws IOException {
    if (seq == null) {
      throw new IOException("reader closed");
    }
  }

   *     surrogate character at the end of the sequence
   */
  protected static int codePointAt(CharSequence seq, int index, int end) {
    checkNotNull(seq);
    if (index < end) {
      char c1 = seq.charAt(index++);
      if (c1 < Character.MIN_HIGH_SURROGATE || c1 > Character.MAX_LOW_SURROGATE) {
        // Fast path (first test is probably all we need to do)
        return c1;

     *
     * @param seq the ASN.1 sequence containing the AP-REQ
     * @param keys the Kerberos keys for decryption
     * @throws PACDecodingException if the sequence cannot be decoded
     */
    public KerberosApRequest(ASN1Sequence seq, KerberosKey[] keys) throws PACDecodingException {
        Enumeration<?> fields = seq.getObjects();
        while (fields.hasMoreElements()) {

    final CharSequence seq;

    CharSequenceCharSource(CharSequence seq) {
      this.seq = checkNotNull(seq);
    }

    @Override
    public Reader openStream() {
      return new CharSequenceReader(seq);
    }

    @Override
    public String read() {
      return seq.toString();
    }

    @Override
    public boolean isEmpty() {

        if (expectSeq != seq) {
            throw new CIFSException(String.format("Invalid MIC sequence, expect %d have %d", expectSeq, seq));
        }

        final byte[] verify = new byte[8];
        System.arraycopy(mic, 4, verify, 0, 8);
        if (!MessageDigest.isEqual(trunc, verify)) {
            if (log.isDebugEnabled()) {

        v.add(new DERTaggedObject(true, 3, new DERSequence(principalVector)));

        // Wrap in APPLICATION tag as expected by KerberosEncData
        DERSequence seq = new DERSequence(v);
        return new DERTaggedObject(false, BERTags.APPLICATION, 3, seq).getEncoded();
    }

    @Test
    void testConstructorWithEmptyToken() {
        // Test that PACDecodingException is thrown for an empty token

        truncationIndicator.length());

    if (seq.length() <= maxLength) {
      String string = seq.toString();
      if (string.length() <= maxLength) {
        return string;
      }
      // if the length of the toString() result was > maxLength for some reason, truncate that
      seq = string;
    }

    return new StringBuilder(maxLength)
        .append(seq, 0, truncationLength)
        .append(truncationIndicator)

        truncationIndicator.length());

    if (seq.length() <= maxLength) {
      String string = seq.toString();
      if (string.length() <= maxLength) {
        return string;
      }
      // if the length of the toString() result was > maxLength for some reason, truncate that
      seq = string;
    }

    return new StringBuilder(maxLength)
        .append(seq, 0, truncationLength)
        .append(truncationIndicator)

            when(mockNdrBuffer.dec_ndr_short()).thenReturn((int) (short) 0x9ABC, (int) (short) 0xDEF0);
            when(mockNdrBuffer.dec_ndr_small()).thenReturn((int) (byte) 0x11, (int) (byte) 0x22, // clock seq bytes
                    (int) (byte) 0xAA, (int) (byte) 0xBB, (int) (byte) 0xCC, (int) (byte) 0xDD, (int) (byte) 0xEE, (int) (byte) 0xFF // node bytes
            );

        MockRegistration registration = registrations.get(registrationId);
        if (registration != null) {
            log.debug("Mock processed heartbeat for: {} seq: {}", registrationId, sequenceNumber);
            return true;
        }
        return false;
    }