/*
(**************************************************************************)
(* *)
(* 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_INTERLEAVER_HPP
#define INCLUDE_SCHIFRA_REED_SOLOMON_FILE_INTERLEAVER_HPP
#include <iostream>
#include <string>
#include "schifra_reed_solomon_interleaving.hpp"
#include "schifra_fileio.hpp"
namespace schifra
{
namespace reed_solomon
{
template <std::size_t block_length, std::size_t stack_size>
class file_interleaver
{
public:
file_interleaver(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 (0 == remaining_bytes)
{
std::cout << "reed_solomon::file_interleaver() - 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_interleaver() - 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_interleaver() - Error: output file could not be created." << std::endl;
return;
}
while (remaining_bytes >= (block_length * stack_size))
{
process_block(in_stream,out_stream);
remaining_bytes -= (block_length * stack_size);
}
if (remaining_bytes > 0)
{
process_incomplete_block(in_stream,out_stream,remaining_bytes);
}
in_stream.close();
out_stream.close();
}
private:
inline void process_block(std::ifstream& in_stream,
std::ofstream& out_stream)
{
for (std::size_t i = 0; i < stack_size; ++i)
{
in_stream.read(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
interleave<char,block_length,stack_size>(block_stack_);
for (std::size_t i = 0; i < stack_size; ++i)
{
out_stream.write(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
}
inline void process_incomplete_block(std::ifstream& in_stream,
std::ofstream& out_stream,
const std::size_t amount)
{
std::size_t complete_row_count = amount / block_length;
std::size_t remainder = amount % block_length;
for (std::size_t i = 0; i < complete_row_count; ++i)
{
in_stream.read(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
if (remainder != 0)
{
in_stream.read(&block_stack_[complete_row_count][0],static_cast<std::streamsize>(remainder));
}
if (remainder == 0)
interleave<char,block_length,stack_size>(block_stack_,complete_row_count);
else
interleave<char,block_length>(block_stack_,complete_row_count + 1,remainder);
for (std::size_t i = 0; i < complete_row_count; ++i)
{
out_stream.write(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
if (remainder != 0)
{
out_stream.write(&block_stack_[complete_row_count][0],static_cast<std::streamsize>(remainder));
}
}
data_block<char,block_length> block_stack_[stack_size];
};
template <std::size_t block_length, std::size_t stack_size>
class file_deinterleaver
{
public:
file_deinterleaver(const std::string& input_file_name,
const std::string& output_file_name)
{
std::size_t input_file_size = schifra::fileio::file_size(input_file_name);
if (input_file_size == 0)
{
std::cout << "reed_solomon::file_deinterleaver() - 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_deinterleaver() - 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_deinterleaver() - Error: output file could not be created." << std::endl;
return;
}
for (std::size_t i = 0; i < (input_file_size / (block_length * stack_size)); ++i)
{
process_block(in_stream,out_stream);
}
if ((input_file_size % (block_length * stack_size)) != 0)
{
process_incomplete_block(in_stream,out_stream,(input_file_size % (block_length * stack_size)));
}
in_stream.close();
out_stream.close();
}
private:
inline void process_block(std::ifstream& in_stream,
std::ofstream& out_stream)
{
for (std::size_t i = 0; i < stack_size; ++i)
{
in_stream.read(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
deinterleave<char,block_length,stack_size>(block_stack_);
for (std::size_t i = 0; i < stack_size; ++i)
{
out_stream.write(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
}
inline void process_incomplete_block(std::ifstream& in_stream,
std::ofstream& out_stream,
const std::size_t amount)
{
std::size_t complete_row_count = amount / block_length;
std::size_t remainder = amount % block_length;
for (std::size_t i = 0; i < complete_row_count; ++i)
{
in_stream.read(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
if (remainder != 0)
{
in_stream.read(&block_stack_[complete_row_count][0],static_cast<std::streamsize>(remainder));
}
if (remainder == 0)
deinterleave<char,block_length>(block_stack_,complete_row_count);
else
deinterleave<char,block_length>(block_stack_,complete_row_count + 1,remainder);
for (std::size_t i = 0; i < complete_row_count; ++i)
{
out_stream.write(&block_stack_[i][0],static_cast<std::streamsize>(block_length));
}
if (remainder != 0)
{
out_stream.write(&block_stack_[complete_row_count][0],static_cast<std::streamsize>(remainder));
}
}
data_block<char,block_length> block_stack_[stack_size];
};
} // namespace reed_solomon
} // namespace schifra
#endif