CaesarEncodeProgram

main.cpp

#include <iostream>
#include <fstream>
#include <string>
#include "head/ReadFile.h"

using namespace std;

void decode(const char *filepath){
	std::string file = ReadFile(filepath);
	
	unsigned int size = file.length();
	
	for(int i = 0; i < size; ++i){
		file.at(i) -= 10;
	}
	
	fstream fs("decoded.txt", std::ios::out);
	if(!fs){
		cout << "ERROR" << endl;
	}
	fs << file << endl;

	return;
}

int main(int argc, char *argv[]){
	if(argc <= 1){
		cout << "Finish." << endl;
		return 0;
	}
	if(strcmp(argv[1], "decode") == 0){
		decode(argv[2]);
		return 0;
	}

	string file;

	file = ReadFile(argv[argc-1]);

	unsigned int size = file.length();

	for(int i = 0; i < size; ++i){
		file.at(i) += 10;
	}

	fstream fs("encoded.txt", std::ios::out);
	if(!fs){
		cout << "ERROR" << endl;
	}
	fs << file << endl;

	return 0;
}

ReadFile.h

#pragma once
#include <fstream>
#include <string>

void ReadFile( const char* FileName, char* StrBuf ){
	std::ifstream ifs( FileName, std::ifstream::binary );
	int len;

	ifs.seekg( 0, ifs.end );
	len = static_cast< int >( ifs.tellg() );
	ifs.seekg( 0, ifs.beg );

	StrBuf = new char[ len ];
	ifs.read( StrBuf, len );

	return;
}
std::string ReadFile( const char* FileName ){
	std::ifstream ifs( FileName, std::ifstream::binary );
	int len;
	char* StrBuf;
	std::string str;

	ifs.seekg( 0, ifs.end );
	len = static_cast< int >( ifs.tellg() );
	ifs.seekg( 0, ifs.beg );

	StrBuf = new char[ len ];
	ifs.read( StrBuf, len );

	str = StrBuf;
	delete[] StrBuf;

	return str;
}