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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 "../fec.h"
void decode(DSDcc::Golay_24_12& Golay_24_12, unsigned char *codeword)
{
for (int i = 0; i < 24; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl;
if (Golay_24_12.decode(codeword))
{
for (int i = 0; i < 12; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl << "Decoding OK" << std::endl;
}
else
{
std::cout << "Decoding error" << std::endl;
}
}
int main(int argc, char *argv[])
{
unsigned char msg[12] = {1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0};
unsigned char er0[24] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
unsigned char codeword[24], xcodeword[24];
DSDcc::Golay_24_12 golay_24_12;
golay_24_12.encode(msg, codeword);
std::cout << "No errors" << std::endl;
decode(golay_24_12, codeword);
std::cout << std::endl << "Error on one bit (4)" << std::endl;
decode(golay_24_12, er0);
std::cout << std::endl << "Flip one bit (4)" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[4] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip one bit (15) in parity" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[15] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip two bits (1,5)" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[1] ^= 1;
xcodeword[5] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip two bits (1,15) - one in parity" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[1] ^= 1;
xcodeword[15] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip three bits (1,5,9)" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[1] ^= 1;
xcodeword[5] ^= 1;
xcodeword[9] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip three bits (1,5,15) - 1 in parity" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[1] ^= 1;
xcodeword[5] ^= 1;
xcodeword[15] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip three bits (1,15,21) - 2 in parity" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[1] ^= 1;
xcodeword[15] ^= 1;
xcodeword[21] ^= 1;
decode(golay_24_12, xcodeword);
std::cout << std::endl << "Flip three bits (15,18,21) - all parity" << std::endl;
std::copy(codeword, codeword + 24, xcodeword);
xcodeword[15] ^= 1;
xcodeword[18] ^= 1;
xcodeword[21] ^= 1;
decode(golay_24_12, xcodeword);
return 0;
}
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