import java.io.*;
import java.util.zip.*;
public class FileSummer {
public static void main(String[] args) throws IOException {
FileInputStream fin = new FileInputStream(args[0]);
System.out.println(args[0] + ":\t" + getCRC32(fin));
fin.close();
}
public static long getCRC32(InputStream in) throws IOException {
Checksum cs = new CRC32();
// It would be more efficient to read chunks of data
// at a time, but this is simpler and easier to understand.
for (int b = in.read(); b != -1; b = in.read()) {
cs.update(b);
}
return cs.getValue();
}
}
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