private void file_to_file(File in_file, File out_file) throws IOException, InterruptedException {
FileInputStream in = in_file.inputStream();
FileOutputStream out = out_file.outputStream();
byte[] buffer = new byte[BUFFER_SIZE];
int n_read;
while ((n_read = in.read(buffer)) != -1) {
checkForInterruption();
out.write(buffer, 0, n_read);
}
in.close();
out.close();
}
