pcap_is_swapped - find out whether a savefile has the native byte order
int pcap_is_swapped(pcap_t *p);
pcap_is_swapped() returns true (1) if p refers to a ``savefile''
that uses a different byte order than the current system. For a live capture,
it always returns false (0).
It must not be called on a pcap descriptor created by
pcap_create(3PCAP) that has not yet been activated by
pcap_is_swapped() returns true (1) or false (0) on success and
PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been
created but not activated.