prh.orig_len = dp_packet_size(buf);
ignore(fwrite(&prh, sizeof prh, 1, file));
ignore(fwrite(dp_packet_data(buf), dp_packet_size(buf), 1, file));
prh.orig_len = dp_packet_size(buf);
ignore(fwrite(&prh, sizeof prh, 1, file));
ignore(fwrite(dp_packet_data(buf), dp_packet_size(buf), 1, file));