#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

void truncate_error(char *filename) {
	fprintf(stderr, "File %s incomplete\n", filename);
	fflush(stderr);
	exit(1);
}

main(int argc, char **argv)
{
    FILE *fp;
    int clientId, uniqueId, sz, len;
    
    if (argc != 2) {
	fprintf(stderr, "usage: readoutfile filename\n");
	exit(1);
    }

    fp = fopen(argv[1], "r");

    while (1) {
	if (fread(&clientId, sizeof(int), 1, fp) != 1)
		break;
	if (fread(&uniqueId, sizeof(int), 1, fp) != 1)
		truncate_error(argv[1]);
	if (fread(&sz, sizeof(int), 1, fp) != 1)
		truncate_error(argv[1]);
	if (fread(&len, sizeof(int), 1, fp) != 1)
		truncate_error(argv[1]);

	/*	printf("read %d records (%d bytes) from %d %d\n", sz, len, clientId, uniqueId); */
	for (int i=0; i<sz; i++) {
	    struct in_addr ip;
	    int hops;
	    int ttl;
	    if (fread(&ip, sizeof(struct in_addr), 1, fp) != 1)
			truncate_error(argv[1]);
	    if (fread(&hops, sizeof(int), 1, fp) != 1)
			truncate_error(argv[1]);
	    printf("destination: %s hops: %d\n", inet_ntoa(ip), hops);
	    for (int j=0; j<hops; j++) {
		float lat;
		if (fread(&ip, sizeof(struct in_addr), 1, fp) != 1)
			truncate_error(argv[1]);
		if (fread(&lat, sizeof(float), 1, fp) != 1)
			truncate_error(argv[1]);
		if (fread(&ttl, sizeof(int), 1, fp) != 1)
			truncate_error(argv[1]);
		if (ttl > 512) {
			fprintf(stderr, "File %s possibly corrupted\n", argv[1]);
			fflush(stderr);
			exit(1);
		}
		printf("%d: %s %f %d\n", j, inet_ntoa(ip), lat, ttl);
	    }
	}
    }
}