SSB_HighSpeed_Modem/hsmodem/fec/schifra_reed_solomon_file_encoder.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_REED_SOLOMON_FILE_ENCODER_HPP
#define INCLUDE_SCHIFRA_REED_SOLOMON_FILE_ENCODER_HPP
#include <cstring>
#include <iostream>
#include <fstream>
#include "schifra_reed_solomon_block.hpp"
#include "schifra_reed_solomon_encoder.hpp"
#include "schifra_fileio.hpp"
namespace schifra
{
namespace reed_solomon
{
template <std::size_t code_length, std::size_t fec_length, std::size_t data_length = code_length - fec_length>
class file_encoder
{
public:
typedef encoder<code_length,fec_length> encoder_type;
typedef typename encoder_type::block_type block_type;
file_encoder(const encoder_type& encoder,
const std::string& input_file_name,
const std::string& output_file_name)
{
std::size_t remaining_bytes = schifra::fileio::file_size(input_file_name);
if (remaining_bytes == 0)
{
std::cout << "reed_solomon::file_encoder() - Error: input file has ZERO size." << std::endl;
return;
}
std::ifstream in_stream(input_file_name.c_str(),std::ios::binary);
if (!in_stream)
{
std::cout << "reed_solomon::file_encoder() - Error: input file could not be opened." << std::endl;
return;
}
std::ofstream out_stream(output_file_name.c_str(),std::ios::binary);
if (!out_stream)
{
std::cout << "reed_solomon::file_encoder() - Error: output file could not be created." << std::endl;
return;
}
std::memset(data_buffer_,0,sizeof(data_buffer_));
std::memset(fec_buffer_ ,0,sizeof(fec_buffer_ ));
while (remaining_bytes >= data_length)
{
process_block(encoder,in_stream,out_stream,data_length);
remaining_bytes -= data_length;
}
if (remaining_bytes > 0)
{
process_block(encoder,in_stream,out_stream,remaining_bytes);
}
in_stream.close();
out_stream.close();
}
private:
inline void process_block(const encoder_type& encoder,
std::ifstream& in_stream,
std::ofstream& out_stream,
const std::size_t& read_amount)
{
in_stream.read(&data_buffer_[0],static_cast<std::streamsize>(read_amount));
for (std::size_t i = 0; i < read_amount; ++i)
{
block_.data[i] = (data_buffer_[i] & 0xFF);
}
if (read_amount < data_length)
{
for (std::size_t i = read_amount; i < data_length; ++i)
{
block_.data[i] = 0x00;
}
}
if (!encoder.encode(block_))
{
std::cout << "reed_solomon::file_encoder.process_block() - Error during encoding of block!" << std::endl;
return;
}
for (std::size_t i = 0; i < fec_length; ++i)
{
fec_buffer_[i] = static_cast<char>(block_.fec(i) & 0xFF);
}
out_stream.write(&data_buffer_[0],static_cast<std::streamsize>(read_amount));
out_stream.write(&fec_buffer_[0],fec_length);
}
block_type block_;
char data_buffer_[data_length];
char fec_buffer_[fec_length];
};
} // namespace reed_solomon
} // namespace schifra
#endif