| /* -*- c++ -*- */ |
| /* @file |
| * @author (C) 2015 by Roman Khassraf <rkhassraf@gmail.com> |
| * @section LICENSE |
| * |
| * Gr-gsm is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 3, or (at your option) |
| * any later version. |
| * |
| * Gr-gsm is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gr-gsm; see the file COPYING. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gnuradio/io_signature.h> |
| #include "dummy_burst_filter_impl.h" |
| #include <stdio.h> |
| #include <grgsm/endian.h> |
| #include <grgsm/gsmtap.h> |
| |
| |
| namespace gr { |
| namespace gsm { |
| |
| // dummy burst defined in gsm 05.02, section 5.2.6 |
| const int8_t dummy_burst_filter_impl::d_dummy_burst[] = {0,0,0, |
| 1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0, |
| 0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0, |
| 0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0, |
| 0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0, |
| 0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0, |
| 0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0, |
| 0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1, |
| 1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1, |
| 0,0,1,0,1,1,1,1,1,0,1,0,1,0, |
| 0,0,0 }; |
| |
| dummy_burst_filter::sptr |
| dummy_burst_filter::make() |
| { |
| return gnuradio::get_initial_sptr |
| (new dummy_burst_filter_impl()); |
| } |
| |
| /* |
| * The private constructor |
| */ |
| dummy_burst_filter_impl::dummy_burst_filter_impl() |
| : gr::block("dummy_burst_filter", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)), |
| d_filter_policy(FILTER_POLICY_DEFAULT) |
| { |
| message_port_register_in(pmt::mp("in")); |
| message_port_register_out(pmt::mp("out")); |
| |
| set_msg_handler(pmt::mp("in"), boost::bind(&dummy_burst_filter_impl::process_burst, this, _1)); |
| } |
| |
| /* |
| * Our virtual destructor. |
| */ |
| dummy_burst_filter_impl::~dummy_burst_filter_impl() {} |
| |
| void dummy_burst_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); |
| int8_t * burst = (int8_t *)(pmt::blob_data(header_plus_burst)) + sizeof(gsmtap_hdr); |
| size_t burst_len = pmt::blob_length(header_plus_burst) - sizeof(gsmtap_hdr); |
| |
| if (!is_dummy_burst(burst, burst_len)) |
| { |
| message_port_pub(pmt::mp("out"), msg); |
| } |
| } |
| |
| bool dummy_burst_filter_impl::is_dummy_burst(int8_t *burst, size_t burst_len) |
| { |
| if (burst_len != DUMMY_BURST_LEN) |
| { |
| return false; |
| } |
| for (int i=0; i<DUMMY_BURST_LEN; i++) |
| { |
| if (burst[i] != d_dummy_burst[i]) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /* Filtering policy */ |
| filter_policy |
| dummy_burst_filter_impl::get_policy(void) |
| { |
| return d_filter_policy; |
| } |
| |
| filter_policy |
| dummy_burst_filter_impl::set_policy(filter_policy policy) |
| { |
| d_filter_policy = policy; |
| return d_filter_policy; |
| } |
| |
| } /* namespace gsm */ |
| } /* namespace gr */ |