1 /* $NetBSD: pcap-common.h,v 1.2 2014/11/19 19:33:30 christos Exp $ */ 2 3 4 /* 5 * We use the "receiver-makes-right" approach to byte order, 6 * because time is at a premium when we are writing the file. 7 * In other words, the pcap_file_header and pcap_pkthdr, 8 * records are written in host byte order. 9 * Note that the bytes of packet data are written out in the order in 10 * which they were received, so multi-byte fields in packets are not 11 * written in host byte order, they're written in whatever order the 12 * sending machine put them in. 13 * 14 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian 15 * machine (if the file was written in little-end order). 16 */ 17 #define SWAPLONG(y) \ 18 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) 19 #define SWAPSHORT(y) \ 20 ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) ) 21 22 extern int dlt_to_linktype(int dlt); 23 24 extern int linktype_to_dlt(int linktype); 25 26 extern void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, 27 u_char *data); 28