SSB_HighSpeed_Modem/hsmodem/fec/schifra_galois_utilities.hpp

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2020-11-05 13:11:57 -05:00
/*
(**************************************************************************)
(* *)
(* Schifra *)
(* Reed-Solomon Error Correcting Code Library *)
(* *)
(* Release Version 0.0.1 *)
(* http://www.schifra.com *)
(* Copyright (c) 2000-2020 Arash Partow, All Rights Reserved. *)
(* *)
(* The Schifra Reed-Solomon error correcting code library and all its *)
(* components are supplied under the terms of the General Schifra License *)
(* agreement. The contents of the Schifra Reed-Solomon error correcting *)
(* code library and all its components may not be copied or disclosed *)
(* except in accordance with the terms of that agreement. *)
(* *)
(* URL: http://www.schifra.com/license.html *)
(* *)
(**************************************************************************)
*/
#ifndef INCLUDE_SCHIFRA_GALOIS_UTILITIES_HPP
#define INCLUDE_SCHIFRA_GALOIS_UTILITIES_HPP
#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <string>
#include <sstream>
#include "schifra_galois_field.hpp"
#include "schifra_galois_field_polynomial.hpp"
namespace schifra
{
namespace galois
{
inline std::string convert_to_string(const unsigned int& value, const unsigned int& width)
{
std::stringstream stream;
stream << std::setw(width) << std::setfill('0') << value;
return stream.str();
}
inline std::string convert_to_string(const int& value, const unsigned int& width)
{
std::stringstream stream;
stream << std::setw(width) << std::setfill('0') << value;
return stream.str();
}
inline std::string convert_to_bin(const unsigned int& value, const unsigned int& field_descriptor)
{
std::string output = std::string(field_descriptor, ' ');
for (unsigned int i = 0; i < field_descriptor; ++i)
{
output[i] = ((((value >> (field_descriptor - 1 - i)) & 1) == 1) ? '1' : '0');
}
return output;
}
inline void alpha_table(std::ostream& os, const field& gf)
{
std::vector<std::string> str_list;
for (unsigned int i = 0; i < gf.size() + 1; ++i)
{
str_list.push_back("alpha^" + convert_to_string(gf.index(i),2) + "\t" +
convert_to_bin (i,gf.pwr()) + "\t" +
convert_to_string(gf.alpha(i),2));
}
std::sort(str_list.begin(),str_list.end());
std::copy(str_list.begin(),str_list.end(),std::ostream_iterator<std::string>(os,"\n"));
}
inline void polynomial_alpha_form(std::ostream& os, const field_polynomial& polynomial)
{
for (int i = 0; i < (polynomial.deg() + 1); ++i)
{
field_symbol alpha_power = polynomial.galois_field().index(polynomial[i].poly());
if (alpha_power != 0)
os << static_cast<unsigned char>(224) << "^" << convert_to_string(alpha_power,2);
else
os << 1;
os << " * "
<< "x^"
<< i
<< ((i != (polynomial.deg())) ? " + " : "");
}
}
inline void polynomial_alpha_form(std::ostream& os, const std::string& prepend, const field_polynomial& polynomial)
{
os << prepend;
polynomial_alpha_form(os,polynomial);
os << std::endl;
}
} // namespace reed_solomon
} // namespace schifra
#endif