this.openFlags &= ~(SmbFile.O_CREAT | SmbFile.O_TRUNC); /* in case close and reopen */
        writeSize = file.tree.session.transport.snd_buf_size - 70;

        useNTSmbs = file.tree.session.transport.hasCapability(SmbConstants.CAP_NT_SMBS);
        if (useNTSmbs) {
            reqx = new SmbComWriteAndX();
            rspx = new SmbComWriteAndXResponse();

        final SmbTransport t2 = dest.tree.session.transport;

        if (t1.snd_buf_size < t2.snd_buf_size) {
            t2.snd_buf_size = t1.snd_buf_size;
        } else {
            t1.snd_buf_size = t2.snd_buf_size;
        }

        bsize = Math.min(t1.rcv_buf_size - 70, t1.snd_buf_size - 70);
        b = new byte[2][bsize];

        try {