public static long checksumRandomAccessFile(Path filename) throws IOException {
try (RandomAccessFile file = new RandomAccessFile(filename.toFile(), "r")) {
long length = file.length();
CRC32 crc = new CRC32();
for (long p = 0; p < length; p++) {
file.seek(p);
int c = file.readByte();
crc.update(c);
}
return crc.getValue();
}
}
