#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <fstream>
using std::ifstream;
using std::ofstream;
using std::ios;
#include <string>
using std::string;
#include <istream>
using std::istream;
#include <sys/stat.h>

const unsigned int checkFileSize(const char * &);
const unsigned int readFile(istream &, const int);

int main(int argc, const char * argv[])
{
	if(argc > 1)
	{
		cout << "Filename: " << argv[1] << endl;
		cout << "File size: " << checkFileSize(argv[1]) << endl;
		ifstream in;
		
		in.open(argv[1], ios::in|ios::binary);
		if(in)
		{
			cout << "PID: " << readFile(in,3) << endl;
			in.close();
		}
		else cout << "Couldn't open file!" << endl;
	}
	else cout << "No file given!" << endl;
	return 0;
}

const unsigned int checkFileSize(const char * & filename)
{
	struct stat filestatus;
	stat( filename, &filestatus );
	return filestatus.st_size;
}

const unsigned int readFile(istream & in, const int numBytes)
{
	char foo[numBytes];
	unsigned int bar = 0;
	
	in.read(foo,sizeof(foo));
	
	for(int i = 0; i < numBytes; i++)
	{
		bar += (int)foo[i];
		if(i != (numBytes-1)) bar << 8;
	}
	
	return bar;
}