class ArrayUtils {

  public static byte[][] split(final byte[] bytes, final int splitIndex) {
    if (splitIndex < 0 || bytes.length < splitIndex) {
      throw new IllegalArgumentException("split index is out of range");
    }

    final byte[] lhs = new byte[splitIndex];
    final byte[] rhs = new byte[bytes.length - splitIndex];

    System.arraycopy(bytes, 0, lhs, 0, lhs.length);
    System.arraycopy(bytes, splitIndex, rhs, 0, rhs.length);
    return new byte[][] {lhs, rhs};
  }

  private  ArrayUtils();

}