Updated for Viginere and moving flag functions to new file

helperFunctions.hpp

@@ -0,0 +1,196 @@
+//Ciphers/helperFunctions.hpp
+//Matthew Ellison
+// Created: 4-29-18
+//Modified: 4-29-18
+//This file contains the driver function and the test functions for the Cipher program
+//This program will use some simple ciphers that are no longer widely used but still fun to play with
+
+
+
+#ifndef HELPER_FUNCTIONS_HPP
+#define HELPER_FUNCTIONS_HPP
+
+
+#include "Headers/Caesar.hpp"
+#include "Headers/Playfair.hpp"
+#include "Headers/Vigenere.hpp"
+#include <iostream>
+#include <fstream>
+#include <string>
+
+
+enum CipherFlagLocation { CAESAR, PLAYFAIR, VIGENERE, NUM_CIPHERS,
+						ENCODE, DECODE, INPUT_FILE, OUTPUT_FILE, SIZE };
+std::string flagStrings[SIZE];
+//Error handling
+bool failFlag = false;		//Set if something fails
+//The functions that will run the ciphers
+std::string runCaesar(std::ifstream& infile, bool encode);
+std::string runPlayfair(std::ifstream& infile, bool encode);
+std::string runVigenere(std::ifstream& infile, bool encode);
+
+
+
+void getFlags(int argc, char** argv, bool cipherFlags[], std::string& inputFileString, std::string& outputFileString){
+	//Cycle through every argument
+	bool valid = false;
+	for(int cnt = 1;cnt < argc;++cnt){
+		//Step through every element in the flagStrings and compare the flags. If the flags do not match or you go out of bounds in argv throw an error
+		for(int stringcnt = 0;stringcnt < SIZE;++stringcnt){
+			if(argv[cnt] == flagStrings[stringcnt]){
+				valid = cipherFlags[stringcnt] = true;
+				//If the flag showed an input file get the file name if possible
+				if(stringcnt == INPUT_FILE){
+					//Make sure there is enough room in argv for the file name
+					if((cnt + 1) < argc){
+						inputFileString = argv[++cnt];
+					}
+				}
+				//If the flag showed an output file get the file name if possible
+				else if(stringcnt == OUTPUT_FILE){
+					//Make sure there is enough room in argv for the file name
+					if((cnt + 1) < argc){
+						outputFileString = argv[++cnt];
+					}
+				}
+				break;
+			}
+		}
+		//If the flag was not valid throw an error
+		if(!valid){
+			std::cout << argv[cnt] << " is an invalid flag" << std::endl;
+			return;
+		}
+		valid = false;
+	}
+}
+
+bool checkFlags(bool flags[]){
+	int counter = 0;
+	bool correct = false;
+	//Run through each flag and counter how many are true
+	for(int cnt = 0;cnt < NUM_CIPHERS;++cnt){
+		if(flags[cnt]){
+			++counter;
+		}
+	}
+
+	//Check if a valid number of flags were true
+	if(counter == 1){
+		correct = true;
+	}
+
+	//Check if either encode or decode is set, but not both
+	if((flags[ENCODE] && flags[DECODE]) || (!flags[ENCODE] && !flags[DECODE])){
+		correct = false;
+	}
+
+	return correct;
+}
+
+void setFlagStrings(){
+	flagStrings[CAESAR] = "-c";
+	flagStrings[PLAYFAIR] = "-p";
+	flagStrings[VIGENERE] = "-v";
+	flagStrings[ENCODE] = "-e";
+	flagStrings[DECODE] = "-d";
+	flagStrings[INPUT_FILE] = "-i";
+	flagStrings[OUTPUT_FILE] = "-o";
+}
+
+std::string runCaesar(std::ifstream& infile, bool encode){
+	std::string inputString, cipherString;
+	int offset;
+	Caesar cipher;
+	//Check if the input file is open
+	if(infile.is_open()){
+		infile >> offset;
+		infile.ignore(10000, '\n');	//Get rid of the \n that is right after the offset
+		std::getline(infile, inputString);
+		if(infile.fail()){
+			failFlag = true;
+			cipherString = "Input file has an incorrect format\n";
+		}
+	}
+	//Otherwise prompt for the appropriate strings
+	else{
+		std::cout << "Enter the cipher offset: ";
+		std::cin >> offset;
+		std::cout << "Enter the input string: ";
+		std::getline(std::cin, inputString);
+	}
+
+	//Run the correct cipher
+	if(encode){
+		cipherString = cipher.encode(offset, inputString);
+	}
+	else{
+		cipherString = cipher.decode(offset, inputString);
+	}
+
+	return cipherString;
+}
+
+std::string runPlayfair(std::ifstream& infile, bool encode){
+	std::string keyword, inputString, cipherString;
+	Playfair cipher;
+	//Check if the input file is open
+	if(infile.is_open()){
+		std::getline(infile, keyword);
+		std::getline(infile, inputString);
+		if(infile.fail()){
+			failFlag = true;
+			cipherString = "Input file has an incorrect format\n";
+		}
+	}
+	//Otherwise prompt for the appropriate strings
+	else{
+		std::cout << "Enter the keyword: ";
+		std::getline(std::cin, keyword);
+		std::cout << "Enter the input string: ";
+		std::getline(std::cin, inputString);
+	}
+
+	//Run the correct cipher
+	if(encode){
+		cipherString = cipher.encode(keyword, inputString);
+	}
+	else{
+		cipherString = cipher.decode(keyword, inputString);
+	}
+
+	return cipherString;
+}
+
+std::string runVigenere(std::ifstream& infile, bool encode){
+	std::string keyword, inputString, cipherString;
+	Vigenere cipher;
+	//Check if the input file is open
+	if(infile.is_open()){
+		std::getline(infile, keyword);
+		std::getline(infile, inputString);
+		if(infile.fail()){
+			failFlag = true;
+			cipherString = "Input file has an incorrect format\n";
+		}
+	}
+	//Otherwise prompt for the appropriate strings
+	else{
+		std::cout << "Enter the keyword: ";
+		std::getline(std::cin, keyword);
+		std::cout << "Enter the input string: ";
+		std::getline(std::cin, inputString);
+	}
+
+	//Run the correct cipher
+	if(encode){
+		cipherString = cipher.encode(keyword, inputString);
+	}
+	else{
+		cipherString = cipher.decode(keyword, inputString);
+	}
+
+	return cipherString;
+}
+
+#endif //HELPER_FUNCTIONS_HPP