#include <iostream>
#include <fstream>
#include <iterator>
#include <vector>
#include <algorithm>

using namespace std;

struct cell
{
	unsigned char operationCode;
	unsigned char operationParameter;
	unsigned int legnthToOperateOn;
} typedef cell;

int main()
{
	ifstream msg;
	cell cur, cur2, cur3;
	int i;
	int flag = 0;

	int rev = 0;

	msg.open("EncryptedMessage.bin", ios::binary);

	vector<unsigned char> vec((std::istreambuf_iterator<char>(msg)), std::istreambuf_iterator<char>());
	vector<unsigned char> vecCpy = vec;
	vector<unsigned char>::iterator it = vec.begin();

	int vecLen = vec.size();

	for (int a = 0; a < 3; a++)
		for (int b = 0; b < 256; b++)
			for (int c = 0; c < vecLen; c++)
			{
				cur.operationCode = a;
				cur.operationParameter = b;
				cur.legnthToOperateOn = c;
				for (int j = 0; j < cur.legnthToOperateOn; j++)
				{
					switch (cur.operationCode)
					{
					case 0:
						*it ^= cur.operationParameter;
						break;
					case 1:
						*it += cur.operationParameter;
						break;
					case 2:
						*it -= cur.operationParameter;
						break;
					}
					//rev == 1 ? it-- : it++;

					if (rev == 1)
						it--;
					else if (rev == 0)
						it++;

					if (it == vec.end())
					{
						rev = 1;
						it--;
					}
					else if (it == vec.begin())
						rev = 0;
				}
				for (std::vector<unsigned char>::const_iterator i = vec.begin(); i != vec.end(); ++i)
				{
					if (*i < 32 || (*i > 32 && *i < 63) || *i == 64 || (*i > 90 && *i < 97) || *i > 122)
						flag = 1;
					else
						cout << *i;
				}
				cout << "\n\n";
				if (flag != 1)
				{
					cout << "FOUND!\n\n";
					for (std::vector<unsigned char>::const_iterator i = vec.begin(); i != vec.end(); ++i)
						std::cout << *i;
				}

				flag = 0;
				vec = vecCpy;
				it = vec.begin();
			}

	//for (std::vector<unsigned char>::const_iterator i = vec.begin(); i != vec.end(); ++i)
		//std::cout << *i;

	msg.close();

	return 0;
}