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/* -*- c++ -*- */
/*
* Copyright 2002 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <qa_atsci_randomizer.h>
#include <cppunit/TestAssert.h>
#include <string.h>
static unsigned int expected_initial_states[] = {
0x018f,
0xd3db,
0xbaf1,
0x8e64,
0x4732,
0x2399,
0xc2d0,
0x6168
};
static unsigned char expected_initial_values[] = {
0xc0,
0x6d,
0x3f,
0x99,
0x38,
0x6a,
0x29,
0x52
};
#define NELEMENTS(ary) ((sizeof (ary)) / sizeof (ary[0]))
void
qa_atsci_randomizer::t0_compare_output_maps ()
{
for (int i = 0; i < 0x10000; i++){
unsigned char slow = atsci_randomizer::slow_output_map(i);
unsigned char fast = atsci_randomizer::fast_output_map(i);
CPPUNIT_ASSERT_EQUAL (slow, fast);
}
}
void
qa_atsci_randomizer::t1_initial_states ()
{
// LFSR should start with expected states
for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
unsigned int got = randomizer.state();
randomizer.clk ();
CPPUNIT_ASSERT_EQUAL (expected_initial_states[i], got);
}
}
void
qa_atsci_randomizer::t2_initial_values ()
{
// LFSR should start with expected values
for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
unsigned char got = randomizer.output_and_clk ();
CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
}
}
void
qa_atsci_randomizer::t3_reset ()
{
// LFSR should start with expected values
for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
unsigned char got = randomizer.output_and_clk ();
CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
}
randomizer.reset (); // reset LFSR
// and now should repeat expected values
for (unsigned int i = 0; i < NELEMENTS (expected_initial_values); i++){
unsigned char got = randomizer.output_and_clk ();
CPPUNIT_ASSERT_EQUAL (expected_initial_values[i], got);
}
}
void
qa_atsci_randomizer::t4_high_level ()
{
static const int N = 5;
atsc_mpeg_packet in[N];
atsc_mpeg_packet_no_sync middle[N];
atsc_mpeg_packet out[N];
memset (in, 0, sizeof (in));
memset (middle, 0, sizeof (middle));
memset (out, 0, sizeof (out));
// setup input test data
int counter = 0xff;
for (int n = 0; n < N; n++){
in[n].data[0] = MPEG_SYNC_BYTE;
for (int i = 0; i < ATSC_MPEG_DATA_LENGTH; i++)
in[n].data[i + 1] = counter++;
}
// randomize N packets
for (int n = 0; n < N; n++)
randomizer.randomize (middle[n], in[n]);
// reset LFSR and derandomize N packets
randomizer.reset (); // reset LFSR
for (int n = 0; n < N; n++)
randomizer.derandomize (out[n], middle[n]);
// compare packets
for (int n = 0; n < N; n++){
CPPUNIT_ASSERT (in[n] == out[n]);
}
}
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