#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;
}