stream.seekg(0, stream.end);
    cout << stream.tellg() << endl;
    stream.seekg(0, stream.beg);
    cout << stream.tellg() << endl;

int counter = 0;
    while (stream.good()) {
        stream.read(buffer, 1);
        cout << stream.tellg() << " " << counter++  << " " << stream.gcount() << endl;
    }
    cout << counter << endl;

...
242770 25488 1
245760 25489 1
249345 25490 1
249346 25491 1
249347 25492 1
...