flow_control: implement pass / drop filtering policies
This change introduces a set of three modes for flow control
filters, one of which is default behavor and two extra modes
else described below:
- FILTER_POLICY_PASS_ALL
- FILTER_POLICY_DROP_ALL
Both modes are opposite, and make a filter either unconditionally
pass or drop all the data one gets to the input. They would be
usable for some external usage.
diff --git a/lib/flow_control/burst_timeslot_filter_impl.cc b/lib/flow_control/burst_timeslot_filter_impl.cc
index 20306d1..c93bc60 100644
--- a/lib/flow_control/burst_timeslot_filter_impl.cc
+++ b/lib/flow_control/burst_timeslot_filter_impl.cc
@@ -48,7 +48,8 @@
: gr::block("burst_timeslot_filter",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0)),
- d_timeslot(timeslot)
+ d_timeslot(timeslot),
+ d_filter_policy(FILTER_POLICY_DEFAULT)
{
message_port_register_in(pmt::mp("in"));
message_port_register_out(pmt::mp("out"));
@@ -63,6 +64,14 @@
void burst_timeslot_filter_impl::process_burst(pmt::pmt_t msg)
{
+ if (d_filter_policy == FILTER_POLICY_DROP_ALL)
+ return;
+
+ if (d_filter_policy == FILTER_POLICY_PASS_ALL) {
+ message_port_pub(pmt::mp("out"), msg);
+ return;
+ }
+
pmt::pmt_t header_plus_burst = pmt::cdr(msg);
gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
@@ -92,5 +101,19 @@
return d_timeslot;
}
+ /* Filtering policy */
+ filter_policy
+ burst_timeslot_filter_impl::get_policy(void)
+ {
+ return d_filter_policy;
+ }
+
+ filter_policy
+ burst_timeslot_filter_impl::set_policy(filter_policy policy)
+ {
+ d_filter_policy = policy;
+ return d_filter_policy;
+ }
+
} /* namespace gsm */
} /* namespace gr */