code: public static boolean containsAt(byte[] array, byte[] searchFor, int index) {
          for (int i = 0; i < searchFor.length; i++) {
              if (index + i >= array.length || array[index + i] != searchFor[i]) {
                  return false;
              }
          }
          return true;
      }
docs: Returns <code>true</code> if the specified array contains the specified sub-array at the specified index.
  
  @param array the array to search in
  @param searchFor the sub-array to search for
  @param index the index at which to search
  @return whether or not the specified array contains the specified sub-array at the specified index