Ideas for a data container

Start with something simple?

• a 32-bit header word with the size in bytes
• class name = dune::RawFragment? or just dune::Fragment?
• do we want a header field that tells us whether the fragment corresponds to a part of a Trigger Record or part of a Time Slice?
  • if so, what about a header field (or fields) that identify that TR or Time Slice?
• do we want a header field that tells us something about the (geographic) source of the data?
• header version
• marker word

Initial idea:

• uint16_t version - fragment header version
• uint16_t marker - marker word
• uint32_t size - fragment size in bytes, includes size of header
• uint16_t id - unique value for each fragment in a TR or timeslice; for internal DAQ use only (offline should not use this field as a geographic ID)
• uint32_t checksum