}
    protected Request peekKey() throws IOException {
        int n;
        do {
            if ((n = readn( in, sbuf, 0, 4 )) < 4)
                return null;
        } while (sbuf[0] == (byte)0x85);  /* Dodge NetBIOS keep-alive */
                                                   /* read smb header */
        if ((n = readn( in, sbuf, 4, 32 )) < 32)
            return null;
        if (log.level >= 4) {

        do {
            if ( ( readn(this.in, this.sbuf, 0, 4) ) < 4 ) {
                return null;
            }
        }
        while ( this.sbuf[ 0 ] == (byte) 0x85 ); /* Dodge NetBIOS keep-alive */
        /* read smb header */
        if ( ( readn(this.in, this.sbuf, 4, SmbConstants.SMB1_HEADER_LENGTH) ) < SmbConstants.SMB1_HEADER_LENGTH ) {
            return null;
        }