code: public int getCurrentPageSize() {
          if (buffer.isEmpty()) return OggPage.getMinimumPageSize();
  
          OggPage p = buffer.get( buffer.size()-1 );
          return p.getPageSize();
      }
docs: Returns the size of the page currently being written
  to, including its headers.
  For a new stream, or a stream that has just been
  flushed, will return zero.
  @return Current page size, or 27 (the minimum) if no current page