external/bsd/libpcap/dist/pcap-common.h

   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);