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