contrib/libpcap/pcap-common.h

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