1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/* -*- 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 */
|
