/* tcpalter - revise pcap files exported from Wireshark */
#include <windows.h>
#include <stdio.h>
#pragma warning (disable : 4305)
#include "data.c"


#define ISIZEOF(x) (sizeof x/sizeof x[0])

typedef unsigned __int8  __int8u;
typedef unsigned __int16 __int16u;
typedef unsigned __int32 __int32u;

FILE *out_stream, *packet_stream;

void fatal_err_msg(const char *msg_string,int err_code) {
	printf("aborting, fatal error %i %s",err_code, msg_string);
	exit(1);
}

void warning_err_msg(const char *msg_string,int err_code) {
	printf("non-fatal error %i %s",err_code, msg_string);
}

int init(void) {
	if ((out_stream = fopen("tcpalter.txt","wt")) == NULL) {
		fatal_err_msg("could not open output file",2);
	}
	if ((packet_stream = fopen("tcpalter.tcp","wb")) == NULL) {
		fatal_err_msg("could not open packet file",2);
	}

	fwrite("\xD4\xC3\xB2\xA1\x02\x00\x04\x00",1,8,packet_stream); //magic, major ver, minor ver
	fwrite("\x00\x00\x00\x00\x00\x00\x00\x00",1,8,packet_stream); //timezone offset, time accuracy
	fwrite("\xFF\xFF\x00\x00\x01\x00\x00\x00",1,8,packet_stream); //max pkt len, linktype

	return 0;
}

int fin(void) {
	fclose(out_stream);
	fclose(packet_stream);
	return 0;
}

void write_packet(double timeNow, char *packet, int iPacketLength) {
	__int32u secNow = (__int32u)timeNow;
	__int32u uSecNow = (__int32u)((timeNow-(double)secNow)*1.0E6);
	fwrite(&secNow,sizeof secNow,1,packet_stream);
	fwrite(&uSecNow,sizeof uSecNow,1,packet_stream);
	fwrite(&iPacketLength,sizeof iPacketLength,1,packet_stream);
	fwrite(&iPacketLength,sizeof iPacketLength,1,packet_stream);
	fwrite(packet,1,iPacketLength,packet_stream);
}

int main(int argc, char **argv) {
#define REPEATS 5
#define WIRE_SPEED_MB 100
#define PACKET_DELAY ((double)ISIZEOF(pkt1)*10.0/(double)WIRE_SPEED_MB*1e-6)
	int iRepeats;
	double dTime = 0.0;
	init();
	for (iRepeats=0; iRepeats<REPEATS; ++iRepeats) {
		int i;
		for (i=0; i<15;++i) {
			write_packet(dTime+0.001*(double)((i/5)*2)+((i%5)*PACKET_DELAY),pkts[0+i],ISIZEOF(pkt1));
		}
		write_packet(dTime+0.004+5.0*PACKET_DELAY,pkts[0+15],ISIZEOF(pkt1));
		for (i=16; i<26; ++i) {
			write_packet(dTime+0.001*(double)(((i-1)/5)*2)+(((i-1)%5)*PACKET_DELAY),pkts[0+i],ISIZEOF(pkt1));
		}
		dTime += 0.250;

		for (i=0; i<15;++i) {
			write_packet(dTime+0.001*(double)((i/5)*2)+((i%5)*PACKET_DELAY),pkts[26+i],ISIZEOF(pkt1));
		}
		write_packet(dTime+0.004+5.0*PACKET_DELAY,pkts[26+15],ISIZEOF(pkt1));
		for (i=16; i<26; ++i) {
			write_packet(dTime+0.001*(double)(((i-1)/5)*2+(i%5)*PACKET_DELAY),pkts[26+i],ISIZEOF(pkt1));
		}
		dTime += 0.250;
	}
	fin();
}