#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;
	int i;

	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>::iterator it = vec.begin();

	for (i = 0; i < 3; i++)
	{
		for (int a = 0; a < 3; a++)
		{
			for (int b = 0; b < 256; b++)
			{
				for (int c = 0; c < 1000; c++)
				{
					cur.operationCode = a;
					cur.operationParameter = b;
					cur.legnthToOperateOn = c;

					if (int(cur.operationCode) == 0)
					{
						for (int j = 0; j < cur.legnthToOperateOn; j++)
						{
							*it ^= int(cur.operationParameter);

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

							if (it == vec.end())
							{
								rev = 1;
								it--;
							}
							else if (it == vec.begin())
								rev = 0;
						}
					}
					else if (int(cur.operationCode) == 1)
					{
						for (int j = 0; j < cur.legnthToOperateOn; j++)
						{
							*it += int(cur.operationParameter);

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

							if (it == vec.end())
							{
								rev = 1;
								it--;
							}
							else if (it == vec.begin())
								rev = 0;
						}
					}
					else if (int(cur.operationCode) == 2)
					{
						for (int j = 0; j < cur.legnthToOperateOn; j++)
						{
							*it -= int(cur.operationParameter);

							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)
		std::cout << *i;

	msg.close();

	return 0;
}