code: public long getUnsignedIntAt(int index) {
          _checkForReadAt(index,4);
          long val = (long) (_buf.getInt(index) & 0xffffffffL);
          return val;
      }
docs: Returns an unsigned four-byte int from the buffer at the specified index
  
  @param index the index
  
  @return the four-byte unsigned int as a long