diff options
Diffstat (limited to 'lib/flow_control/dummy_burst_filter_impl.cc')
-rw-r--r-- | lib/flow_control/dummy_burst_filter_impl.cc | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/flow_control/dummy_burst_filter_impl.cc b/lib/flow_control/dummy_burst_filter_impl.cc new file mode 100644 index 0000000..33c24cb --- /dev/null +++ b/lib/flow_control/dummy_burst_filter_impl.cc @@ -0,0 +1,105 @@ +/* -*- c++ -*- */ +/* @file + * @author 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)) + { + 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) + { + 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; + } + + } /* namespace gsm */ +} /* namespace gr */ |