code: public Packet getNextPacket() {
          Packet parsedPacket = parseNextPacketFromPdml();
          
          if ( parsedPacket == null ) {       // All packets have been read
              return null;
          }
          
          parsedPacket = addTcpdumpInfoToPacket(parsedPacket);
          
          return parsedPacket;
      }
docs: Returns the next Packet that can be parsed, or null if all packets have been read
  @return Packet