SSB_HighSpeed_Modem/hsmodem/fec/schifra_galois_field_element.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_FIELD_ELEMENT_HPP
#define INCLUDE_SCHIFRA_GALOIS_FIELD_ELEMENT_HPP
#include <iostream>
#include <vector>
#include "schifra_galois_field.hpp"
namespace schifra
{
namespace galois
{
class field_element
{
public:
field_element(const field& gfield)
: field_(gfield),
poly_value_(-1)
{}
field_element(const field& gfield,const field_symbol& v)
: field_(const_cast<field&>(gfield)),
poly_value_(v)
{}
field_element(const field_element& gfe)
: field_(const_cast<field&>(gfe.field_)),
poly_value_(gfe.poly_value_)
{}
~field_element()
{}
inline field_element& operator = (const field_element& gfe)
{
if ((this != &gfe) && (&field_ == &gfe.field_))
{
poly_value_ = gfe.poly_value_;
}
return *this;
}
inline field_element& operator = (const field_symbol& v)
{
poly_value_ = v & field_.size();
return *this;
}
inline field_element& operator += (const field_element& gfe)
{
poly_value_ ^= gfe.poly_value_;
return *this;
}
inline field_element& operator += (const field_symbol& v)
{
poly_value_ ^= v;
return *this;
}
inline field_element& operator -= (const field_element& gfe)
{
*this += gfe;
return *this;
}
inline field_element& operator -= (const field_symbol& v)
{
*this += v;
return *this;
}
inline field_element& operator *= (const field_element& gfe)
{
poly_value_ = field_.mul(poly_value_, gfe.poly_value_);
return *this;
}
inline field_element& operator *= (const field_symbol& v)
{
poly_value_ = field_.mul(poly_value_, v);
return *this;
}
inline field_element& operator /= (const field_element& gfe)
{
poly_value_ = field_.div(poly_value_, gfe.poly_value_);
return *this;
}
inline field_element& operator /= (const field_symbol& v)
{
poly_value_ = field_.div(poly_value_, v);
return *this;
}
inline field_element& operator ^= (const int& n)
{
poly_value_ = field_.exp(poly_value_,n);
return *this;
}
inline bool operator == (const field_element& gfe) const
{
return ((field_ == gfe.field_) && (poly_value_ == gfe.poly_value_));
}
inline bool operator == (const field_symbol& v) const
{
return (poly_value_ == v);
}
inline bool operator != (const field_element& gfe) const
{
return ((field_ != gfe.field_) || (poly_value_ != gfe.poly_value_));
}
inline bool operator != (const field_symbol& v) const
{
return (poly_value_ != v);
}
inline bool operator < (const field_element& gfe)
{
return (poly_value_ < gfe.poly_value_);
}
inline bool operator < (const field_symbol& v)
{
return (poly_value_ < v);
}
inline bool operator > (const field_element& gfe)
{
return (poly_value_ > gfe.poly_value_);
}
inline bool operator > (const field_symbol& v)
{
return (poly_value_ > v);
}
inline field_symbol index() const
{
return field_.index(poly_value_);
}
inline field_symbol poly() const
{
return poly_value_;
}
inline field_symbol& poly()
{
return poly_value_;
}
inline const field& galois_field() const
{
return field_;
}
inline field_symbol inverse() const
{
return field_.inverse(poly_value_);
}
inline void normalize()
{
poly_value_ &= field_.size();
}
friend std::ostream& operator << (std::ostream& os, const field_element& gfe);
private:
const field& field_;
field_symbol poly_value_;
};
inline field_element operator + (const field_element& a, const field_element& b);
inline field_element operator - (const field_element& a, const field_element& b);
inline field_element operator * (const field_element& a, const field_element& b);
inline field_element operator * (const field_element& a, const field_symbol& b);
inline field_element operator * (const field_symbol& a, const field_element& b);
inline field_element operator / (const field_element& a, const field_element& b);
inline field_element operator ^ (const field_element& a, const int& b);
inline std::ostream& operator << (std::ostream& os, const field_element& gfe)
{
os << gfe.poly_value_;
return os;
}
inline field_element operator + (const field_element& a, const field_element& b)
{
field_element result = a;
result += b;
return result;
}
inline field_element operator - (const field_element& a, const field_element& b)
{
field_element result = a;
result -= b;
return result;
}
inline field_element operator * (const field_element& a, const field_element& b)
{
field_element result = a;
result *= b;
return result;
}
inline field_element operator * (const field_element& a, const field_symbol& b)
{
field_element result = a;
result *= b;
return result;
}
inline field_element operator * (const field_symbol& a, const field_element& b)
{
field_element result = b;
result *= a;
return result;
}
inline field_element operator / (const field_element& a, const field_element& b)
{
field_element result = a;
result /= b;
return result;
}
inline field_element operator ^ (const field_element& a, const int& b)
{
field_element result = a;
result ^= b;
return result;
}
} // namespace galois
} // namespace schifra
#endif