if ( host.indexOf('.') < 0 && host.toUpperCase(Locale.ROOT).equals(host) ) {
            // this is not too good, probably should better pass the address and check that it is a netbios one.
            // While we could look up the domain controller/KDC we cannot really make the java kerberos implementation
            // use a KDC of our choice.

     * Some fields specify the offset from the beginning of the header. This
     * field should be used for calculating that. This would likely be zero
     * but an implemantation that encorporates the transport header(for
     * efficiency) might use a different initial bufferIndex. For example,
     * to eliminate copying data when writing NbtSession data one might
     * manage that 4 byte header specifically and therefore the initial

    }


    @Override
    public int getHeaderFieldInt ( String header, int def ) {
        handshake();
        return this.connection.getHeaderFieldInt(header, def);
    }


    @Override
    public long getHeaderFieldDate ( String header, long def ) {
        handshake();
        return this.connection.getHeaderFieldDate(header, def);
    }


    @Override

    static final int IN        = 0x0001;
    static final int A         = 0x0001;
    static final int NS        = 0x0002;
    static final int NULL      = 0x000a;

    static final int HEADER_LENGTH = 12;

    // header field offsets
    static final int OPCODE_OFFSET = 2;
    static final int QUESTION_OFFSET = 4;
    static final int ANSWER_OFFSET = 6;
    static final int AUTHORITY_OFFSET = 8;

     * Some fields specify the offset from the beginning of the header. This
     * field should be used for calculating that. This would likely be zero
     * but an implemantation that encorporates the transport header(for
     * efficiency) might use a different initial bufferIndex. For example,
     * to eliminate copying data when writing NbtSession data one might
     * manage that 4 byte header specifically and therefore the initial

        synchronized (BUF) {
            System.arraycopy( sbuf, 0, BUF, 0, 4 + HEADER_LENGTH );
            int size = Encdec.dec_uint16be( BUF, 2 ) & 0xFFFF;
            if (size < (HEADER_LENGTH + 1) || (4 + size) > rcv_buf_size ) {
                throw new IOException( "Invalid payload size: " + size );
            }

        }
        return bufferIndex - start;
    }


    protected int writeHeaderWireFormat ( byte[] dst, int dstIndex ) {
        System.arraycopy(SMBUtil.SMB2_HEADER, 0, dst, dstIndex, SMBUtil.SMB2_HEADER.length);

        SMBUtil.writeInt2(this.creditCharge, dst, dstIndex + 6);
        SMBUtil.writeInt2(this.command, dst, dstIndex + 12);
        SMBUtil.writeInt2(this.credit, dst, dstIndex + 14);

        for ( int i = 0; i < length; i++ ) {
            switch ( state ) {
            case 0:
                if ( in[ i ] != '/' ) {
                    // Checked exception (e.g. MalformedURLException) would be better
                    // but this would be a nightmare API wise
                    throw new RuntimeCIFSException("Invalid smb: URL: " + this.url);
                }
                out[ prefixLen++ ] = in[ i ];