#ifndef _COMMON_H#define _COMMON_H#define FORMAT_CAP      1#define FORMAT_IVS      2#define TCPDUMP_MAGIC           0xA1B2C3D4#define TCPDUMP_CIGAM           0xD4C3B2A1#define IVSONLY_MAGIC           "\xBF\xCA\x84\xD4"#define PCAP_VERSION_MAJOR      2#define PCAP_VERSION_MINOR      4#define LINKTYPE_ETHERNET       1#define LINKTYPE_IEEE802_11     105#define LINKTYPE_PRISM_HEADER   119#define uchar  unsigned char#define ushort unsigned short#define uint   unsigned int#define ulong  unsigned long#define SWAP32(x)       \    x = ( ( ( x >> 24 ) & 0x000000FF ) | \          ( ( x >>  8 ) & 0x0000FF00 ) | \          ( ( x <<  8 ) & 0x00FF0000 ) | \          ( ( x << 24 ) & 0xFF000000 ) );struct pcap_file_header{    uint magic;    ushort version_major;    ushort version_minor;    int thiszone;    uint sigfigs;    uint snaplen;    uint linktype;};struct pcap_pkthdr{    int tv_sec;    int tv_usec;    uint caplen;    uint len;};#endif /* common.h */