public static byte[] loadBinaryFile(String fileName, int bufSize default defaultBufferedOutputStreamSize()) {
 try {
  if (!new File(fileName).exists())
    return null;

  FileInputStream in = new FileInputStream(fileName);

  byte buf[] = new byte[bufSize];
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  int l;
  while (true) {
    l = in.read(buf);
    if (l <= 0) break;
    out.write(buf, 0, l);
  }
  in.close();
  return out.toByteArray();
 } catch (IOException e) { throw new RuntimeException(e); }
}

public static byte[] loadBinaryFile(File file, int bufSize default defaultBufferedOutputStreamSize()) {
  return loadBinaryFile(file.getPath(), bufSize);
}

Began life as a copy of #2000553