static byte[] loadBinaryFilePart(File file, long start, long end) {
  RandomAccessFile raf = new RandomAccessFile(file);
  byte[] buffer = new byte[end-start];
  try {
    raf.skipBytes(start);
    raf.readFully(buffer, 0, end-start);
    return buffer;
  } finally {
    raf.close();
  }
}