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