diff options
Diffstat (limited to 'contrib/libpcap/pcap-common.h')
-rw-r--r-- | contrib/libpcap/pcap-common.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/contrib/libpcap/pcap-common.h b/contrib/libpcap/pcap-common.h new file mode 100644 index 000000000000..0c80ba326758 --- /dev/null +++ b/contrib/libpcap/pcap-common.h @@ -0,0 +1,25 @@ + +/* + * We use the "receiver-makes-right" approach to byte order, + * because time is at a premium when we are writing the file. + * In other words, the pcap_file_header and pcap_pkthdr, + * records are written in host byte order. + * Note that the bytes of packet data are written out in the order in + * which they were received, so multi-byte fields in packets are not + * written in host byte order, they're written in whatever order the + * sending machine put them in. + * + * ntoh[ls] aren't sufficient because we might need to swap on a big-endian + * machine (if the file was written in little-end order). + */ +#define SWAPLONG(y) \ +((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) +#define SWAPSHORT(y) \ + ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) ) + +extern int dlt_to_linktype(int dlt); + +extern int linktype_to_dlt(int linktype); + +extern void swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, + int header_len_64_bytes); |