private byte[] getBytesFrom(int start) {
      int end = data.position();
      byte[] result = new byte[end - start];
      data.position(start);
      data.get(result);
      return result;
    }
Returns a byte array containing the bytes from {@code start} to this section's current
position.
android/android_framework/dex-maker/src/main/java/com/android/dex/Dex.java