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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// This program 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 as version 3 of the License, or //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string.h>
#include "../fec.h"
void decode(DSDcc::QR_16_7_6& qr_16_7_6, unsigned char *codeword)
{
for (int i = 0; i < 16; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl;
if (qr_16_7_6.decode(codeword))
{
for (int i = 0; i < 7; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl << "Decoding OK" << std::endl;
}
else
{
std::cout << "Decoding error" << std::endl;
}
}
void listAll(DSDcc::QR_16_7_6& qr_16_7_6, unsigned int *codewordValues)
{
unsigned char msg[7];
unsigned char codeword[16];
int i = 0;
for (unsigned char b6 = 0; b6 < 2; b6++)
{
msg[0] = b6;
for (unsigned char b5 = 0; b5 < 2; b5++)
{
msg[1] = b5;
for (unsigned char b4 = 0; b4 < 2; b4++)
{
msg[2] = b4;
for (unsigned char b3 = 0; b3 < 2; b3++)
{
msg[3] = b3;
for (unsigned char b2 = 0; b2 < 2; b2++)
{
msg[4] = b2;
for (unsigned char b1 = 0; b1 < 2; b1++)
{
msg[5] = b1;
for (unsigned char b0 = 0; b0 < 2; b0++)
{
msg[6] = b0;
qr_16_7_6.encode(msg, codeword);
codewordValues[i] = (codeword[15])
+ (codeword[14]<<1)
+ (codeword[13]<<2)
+ (codeword[12]<<3)
+ (codeword[11]<<4)
+ (codeword[10]<<5)
+ (codeword[9]<<6)
+ (codeword[8]<<7)
+ (codeword[7]<<8)
+ (codeword[6]<<9)
+ (codeword[5]<<10)
+ (codeword[4]<<11)
+ (codeword[3]<<12)
+ (codeword[2]<<13)
+ (codeword[1]<<14)
+ (codeword[0]<<15);
i++;
}
}
}
}
}
}
}
}
int main(int argc, char *argv[])
{
unsigned char msg[7] = {0, 1, 1, 0, 1, 0, 1};
unsigned char codeword[16], xcodeword[16];
DSDcc::QR_16_7_6 qr_16_7_6;
static const unsigned int validCodewordValues[128] = {
0,627,1253,1686,2505,3002,3372,3935,4578,5009,5383,6004,6187,
6744,7374,7869,8631,9156,9554,10017,10366,10765,11419,12008,12373,12838,13488,
14019,14748,15343,15737,16138,16670,17261,17915,18312,18647,19108,19506,20033,
20732,21135,21529,22122,22837,23366,24016,24483,24745,25306,25676,26175,26976,
27411,28037,28662,29003,29496,30126,30685,30850,31473,31847,32276,32847,33340,
33962,34521,35206,35829,36195,36624,37293,37854,38216,38715,39012,39447,40065,
40690,41464,41867,42269,42862,43057,43586,44244,44711,45082,45673,46335,46732,
47571,48032,48438,48965,49489,49954,50612,51143,51352,51947,52349,52750,53427,
53952,54358,54821,55674,56073,56735,57324,57574,58005,58371,58992,59695,60252,
60874,61369,61700,62327,62945,63378,63693,64190,64552,65115
};
qr_16_7_6.encode(msg, codeword);
std::cout << "No errors" << std::endl;
decode(qr_16_7_6, codeword);
std::cout << "Flip one bit (4)" << std::endl;
std::copy(codeword, codeword + 16, xcodeword);
xcodeword[4] ^= 1;
decode(qr_16_7_6, xcodeword);
for (int i = 0; i < 9; i++)
{
std::cout << "Flip one parity bit " << 7+i << std::endl;
std::copy(codeword, codeword + 16, xcodeword);
xcodeword[7+i] ^= 1;
decode(qr_16_7_6, xcodeword);
}
std::cout << "Flip two bits (1,5)" << std::endl;
std::copy(codeword, codeword + 16, xcodeword);
xcodeword[1] ^= 1;
xcodeword[5] ^= 1;
decode(qr_16_7_6, xcodeword);
for (int i = 0; i < 9; i++)
{
std::cout << "Flip two bits (1) and one parity bit " << 7+i << std::endl;
std::copy(codeword, codeword + 16, xcodeword);
xcodeword[1] ^= 1;
xcodeword[7+i] ^= 1;
decode(qr_16_7_6, xcodeword);
}
std::cout << "Verify valid codewords values" << std::endl;
unsigned int calculatedValidCodewordValues[128];
listAll(qr_16_7_6, calculatedValidCodewordValues);
if (memcmp(calculatedValidCodewordValues, validCodewordValues, 128) == 0) {
std::cout << "valid codewords OK" << std::endl;
} else {
std::cout << "valid codewords KO" << std::endl;
}
return 0;
}
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