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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef GF2MAT_H
#define GF2MAT_H
#include "alist.h"
#include "gf2vec.h"
#include <vector>
class GF2Mat
{
//! The matrix H
std::vector<std::vector<char>> H;
//! Number of rows in H
int M;
//! Number of columns in H
int N;
public:
//! Default constructor
GF2Mat(){};
//! Construct an M x N matrix with all 0 entries
GF2Mat(int m, int n);
//! Loads the matrix from alist _list
GF2Mat(alist _list);
//! Initializes the class from a 2-D vector X
GF2Mat(std::vector<std::vector<char>> X);
//! Returns the variable M
int get_M();
//! Returns the variable N
int get_N();
//! Set the element at (i, j) coordinate to val
void set_element(int i, int j, char val);
//! Returns the element at coordinate (i, j)
char get_element(int i, int j);
//! Returns the ith row
GF2Vec get_row(int i);
//! Returns the ith column
GF2Vec get_col(int i);
//! Returns the ith row
GF2Vec operator[](int i);
//! Prints the matrix H
void print_matrix();
//! Sets the ith column with the given vector
void set_col(int i, GF2Vec vec);
//! Sets the ith row with the given vector
void set_row(int i, GF2Vec vec);
//! Swaps columns i and j
void swap_cols(int i, int j);
//! Adds column j to i and replace i with the sum
void add_cols(int i, int j);
//! Add row j to i and replace j with the sum
void add_rows(int i, int j);
//! Returns the variable H
std::vector<std::vector<char>> get_H();
/*!
* \brief Obtains an equivalent representation of H for encoding
*
* For encoding a G matrix in the form [I P] obtained from the
* parity matrix H, by (a) Column permutations, (b) Row additions
* and (c) Row permutations. Details of encoding is given in
* section A.1 of the reference:
*
* - "Modern Coding Theory", T Richardson and R Urbanke.
*
* \param p The column permutation during this operation.
* \param rank The rank of the matrix.
*/
GF2Mat get_G(std::vector<int>& p, int& rank);
};
#endif // #ifndef GF2MAT_H
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