Function open_with_payload 

pub fn open_with_payload(
    path: &Path,
) -> Result<Box<dyn Iterator<Item = Result<PacketData, PcapError>>>, PcapError>

Open a file and return an iterator that yields both PacketInfo and the raw captured bytes for each packet.

Useful for the export pipeline where the payload must be written out. Format auto-detection works the same as open.