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