Mega Code Archive
A simple file-comparison utility
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#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, char *argv[])
{
bool equal = true;
bool ferr = false;
unsigned char buf1[1024], buf2[1024];
if(argc!=3) {
cout << "Usage: compfiles <file1> <file2>\n";
return 1;
}
ifstream f1(argv[1], ios::in | ios::binary);
if(!f1) {
cout << "Cannot open " << argv[1] << endl;
return 1;
}
ifstream f2(argv[2], ios::in | ios::binary);
if(!f2) {
cout << "Cannot open " << argv[2] << endl;
f1.close();
if(!f1.good())
cout << "Error closing " << argv[1] << endl;
return 1;
}
do {
f1.read((char *) buf1, sizeof buf1);
f2.read((char *) buf2, sizeof buf2);
if(!f1.eof() && !f1.good()) {
cout << "Error reading " << argv[1] << endl;
ferr = true;
break;
}
if(!f2.eof() && !f2.good()) {
cout << "Error reading " << argv[2] << endl;
ferr = true;
break;
}
if(f1.gcount() != f2.gcount()) {
cout << "Files are different lengths.\n";
equal = false;
break;
}
for(int i=0; i < f1.gcount(); ++i)
if(buf1[i] != buf2[i]) {
cout << "Files differ.\n";
equal = false;
break;
}
} while(!f1.eof() && !f2.eof() && equal);
if(!ferr && equal) cout << "Files are the same.\n";
f1.clear();
f2.clear();
f1.close();
f2.close();
if(!f1.good() || !f2.good()) {
cout << "Error closing files.\n";
return 1;
}
return 0;
}
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