capshift.h

#define ADD 1
#define SUBTRACT 2

typedef unsigned int guint32;
typedef unsigned short guint16;
typedef signed int gint32;
typedef struct pcap_hdr_s {
        guint32 magic_number;   /* magic number */
        guint16 version_major;  /* major version number */
        guint16 version_minor;  /* minor version number */
        gint32  thiszone;       /* GMT to local correction */
        guint32 sigfigs;        /* accuracy of timestamps */
        guint32 snaplen;        /* max length of captured packets, in octets */
        guint32 network;        /* data link type */
} pcap_hdr_t;

typedef struct pcaprec_hdr_s {
        guint32 ts_sec;         /* timestamp seconds */
        guint32 ts_usec;        /* timestamp microseconds */
        guint32 incl_len;       /* number of octets of packet saved in file */
        guint32 orig_len;       /* actual length of packet */
} pcaprec_hdr_t;

typedef struct params_s {
	char *infile;
	char *outfile;
	guint32		secs;
	guint32		usecs;
	guint32		sign;
        guint32         mode;    /* indicate if its a relative or absolate displacement and how to use offset  */
} params_t;