Comment by elevation

Sadly proprietary, but the core of it was to open a file with pcap_open_offline() [0], and then calling pcap_next() from a loop and reading a few bits out of the packet buffer. With NVMe disks, the information I needed was instantaneous for a 10M packet file.

https://manpages.debian.org/stretch/libpcap0.8-dev/pcap_open...