* implementations.
     * 
     * Changes in between these calls (as long as the file is open) are buffered by the server, so iteratively calling
     * this method should provide all changes (size of that buffer can be adjusted through
     * {@link jcifs.Configuration#getNotifyBufferSize()}).

    private void reset() {
        url = null;
        sae = null;
    }

/**
Set the default <tt>NtlmAuthenticator</tt>. Once the default authenticator is set it cannot be changed. Calling this metho again will have no effect.
 */

    public synchronized static void setDefault( NtlmAuthenticator a ) {
        if( auth != null ) {
            return;
        }
        auth = a;
    }

     * 
     * @param challenge The server challenge.
     * @return A <code>byte[]</code> containing the effective user session key,
     * used in SMB MAC signing and NTLMSSP signing and sealing.
     */
    public byte[] getUserSessionKey(byte[] challenge) {
        if (hashesExternal) return null;
        byte[] key = new byte[16];
        try {
            getUserSessionKey(challenge, key, 0); 

                break;
            case NOT_LISTENING_CALLED:
                result += "Not listening on called name";
                break;
            case NOT_LISTENING_CALLING:
                result += "Not listening for calling name";
                break;
            case CALLED_NOT_PRESENT:
                result += "Called name not present";
                break;
            case NO_RESOURCES:

            if ( this.andxOffset == 0 ) { /* Snap server workaround */
                this.andxCommand = (byte) 0xFF;
            }

            /*
             * no point in calling readParameterWordsWireFormat if there are no more
             * parameter words. besides, win98 doesn't return "OptionalSupport" field
             */

            if ( this.wordCount > 2 ) {

    public boolean canRead() throws SmbException {
        if( getType() == TYPE_NAMED_PIPE ) { // try opening the pipe for reading?
            return true;
        }
        return exists(); // try opening and catch sharing violation?
    }

/**
 * Tests to see if the file this <code>SmbFile</code> represents
 * exists and is not marked read-only. By default, resources are

     * Indicates datagram authentication.
     */
    public static final int NTLMSSP_NEGOTIATE_DATAGRAM_STYLE = 0x00000040;

    /**
     * Indicates that the LAN Manager session key should be used for
     * signing and sealing authenticated communication.
     */
    public static final int NTLMSSP_NEGOTIATE_LM_KEY = 0x00000080;

    /**
     * ??? According to spec this is a reserved bit and must be set to zero
     */

                                /* Apparently once a successfull NTLMSSP login occurs, the
                                 * server will return "Access denied" even if a logoff is
                                 * sent. Unfortunately calling disconnect() doesn't always
                                 * actually shutdown the connection before other threads
                                 * have committed themselves (e.g. InterruptTest example).

                    case NOT_LISTENING_CALLED:
                        result += "Not listening on called name";
                        break;
                    case NOT_LISTENING_CALLING:
                        result += "Not listening for calling name";
                        break;
                    case CALLED_NOT_PRESENT:
                        result += "Called name not present";
                        break;

            if( andxOffset == 0 ) { /* Snap server workaround */
                andxCommand = (byte)0xFF;
            }

            /*
             * no point in calling readParameterWordsWireFormat if there are no more
             * parameter words. besides, win98 doesn't return "OptionalSupport" field
             */
 
            if( wordCount > 2 ) {