ITCW_OP_READ
itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
itcw_op = ITCW_OP_READ;
tcw_init(itcw->tcw, (op == ITCW_OP_READ) ? 1 : 0,