pad method

void pad ()

Implementation

void pad() {
  int pad = 0;
  int mod = _offset % 4;
  if (mod > 0) {
    pad = 4 - mod;
  }

  while (pad-- > 0) {
    int b = readByte();
    if (b != 0) {
      throw Exception("non-zero padding");
    }
  }
}