#include <iostream>
#include<experimental/filesystem>
#include<filesystem>
#include<fstream>
#include<string>
#include<cstdlib>
#include<ctime>
#include<cstring>

using namespace std;
using namespace experimental::filesystem;

hash<string>b;
string s;
unsigned long long z = 0;
ofstream f;
ifstream f1;

unsigned short CRC16(unsigned short len, string s)
{
	unsigned short crc = 65535;
	unsigned char *str = new unsigned char[s.size()];
	for (size_t i = 0; i < s.size(); i++)
	{
		str[i] = s[i];
	}
	while (len)
	{
		crc ^= *str << 8;
		*str++;
		for (unsigned char i = 0; i < 8; i++)
		{
			if (crc & 32768)
			{
				crc = (crc << 1) ^ 4129;
			}
			else crc = crc << 1;
		}
		len--;
	}
	cout << crc << endl;
	return crc;
}

void hash_sum(string &p)
{
	f.open(p);
	for (auto i : directory_iterator("C:\\Test"))
	{
		path a = i;
		f1.open(i);
		while (!f1.eof())
		{
			getline(f1, s);
			z += CRC16(s.size(),s);
		}
		f << z << " " << a.stem() << " " << file_size(a) << " " << a << endl;
		z = 0;
		f1.close();
	}
	f.close();
}

vector<string> init()
{
	string q, w;
	vector<string> res;
	while (!f1.eof())
	{
		getline(f1, q);
		if (q == "")break;
		for (size_t i = 0; q[i] != ' '; i++)
		{
			w += q[i];
		}
		res.push_back(w);
	}
	return res;
}

int main()
{
	srand(time(NULL));
	string p = "C:\\1\\List.txt";
	hash_sum(p);

	for (auto i : directory_iterator("C:\\Test"))
	{
		if (rand() % 2)
		{
			vector<string>s1;
			f1.open(i);
			while (!f1.eof())
			{
				getline(f1, s);
				s1.push_back(s);
			}
			f1.close();
			for (size_t i = 0; i < s1.size(); i++)
			{
				for (size_t j = 0; j < s1[i].size(); j++)
				{
					if (rand() % 2)
					{
						s1[i][j] = (char)rand() % 128;
					}
				}
			}
			f.open(i);
			for (size_t i = 0; i < s1.size(); i++)
			{
				f << s1[i];
				if (i + 1 != s1.size())f << endl;
			}
			f.close();
		}
	}
	p = "C:\\1\\List1.txt";
	hash_sum(p);
	f1.open("C:\\1\\List.txt");
	vector<string>fir = init();
	f1.close();
	f1.open(p);
	vector<string>sec = init();
	f1.close();
	for (size_t i = 0; i < fir.size(); i++)
	{
		if (fir[i] == sec[i])cout << "Correct" << endl;
		else cout << "Incorrect" << endl;
	}

	return 0;
}