misc/BinCracking/hexcmp.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 int main(int argc, char *argv[])
   5 {
   6   printf("HEXCMP 0.3\nHexadecimal Comparator\n<-Harvie 2oo7\n\n");
   7   if(argc < 3) {
   8           printf("Usage: hexcmp oldfile newfile [decimal_offset_to_start_at]\n");
   9           printf("This will show what is new in \"newfile\",\n");
  10           printf("this can be useful, when making binary patchers.\n\n");
  11           system("pause");
  12           return 0;
  13           }
  14
  15   printf("Comparing old \"%s\" with new \"%s\"\n", argv[1], argv[2]);
  16
  17   FILE *forig, *fcrac;
  18   forig = fopen(argv[1], "rb");
  19     if(forig == NULL) { printf("Error while opening %s\n", argv[1]); return 0; }
  20   fcrac = fopen(argv[2], "rb");
  21     if(fcrac == NULL) { printf("Error while opening %s\n", argv[2]); return 0; }
  22
  23   short found = 0;
  24   unsigned long int offset = 0, last = 0, end = 0, dlen = 0;
  25   int corig = 0, ccrac = 0;
  26
  27   if(argc > 3) {
  28           offset = atof(argv[3]);
  29           printf("Comparing from offset D: %d H: 0x%x\n", offset, offset);
  30           }
  31   printf("\n");
  32
  33   //Seek
  34   fseek(forig, offset, SEEK_SET);
  35   fseek(fcrac, offset, SEEK_SET);
  36
  37   while((ccrac = fgetc(fcrac)) != EOF) {
  38     if( (corig = fgetc(forig)) == EOF ) {
  39        corig == -9999;
  40        if(end == 0) {
  41          end = 1;
  42        }
  43     }
  44     if(corig != ccrac) {
  45
  46       if(end == 1) {
  47         if(dlen != 0) {
  48                 printf("\nLenght: %d Bytes", dlen);
  49                 dlen = 0;
  50                 }
  51         printf("\n\n--- END OF OLDER FILE ---\n\n");
  52         end = 2;
  53       }
  54
  55       if(offset != (last+1)) {
  56         if(dlen != 0) {
  57           printf("\nLenght: %d Bytes", dlen);
  58           dlen = 0;
  59           printf("\n\n");
  60         }
  61         printf("Difference @ D: %d H: 0x%x\n", offset, offset);
  62       }
  63
  64       printf("\\x%x", ccrac);
  65
  66       dlen++;
  67       last = offset;
  68       found = 1;
  69     }
  70
  71     offset++;
  72   }
  73
  74    if(dlen != 0) {
  75           printf("\nLenght: %d Bytes", dlen);
  76         }
  77
  78   fclose(forig);
  79   fclose(fcrac);
  80
  81   if(found == 0) {
  82            printf("No difference found!!!");
  83            }
  84   printf("\n");
  85   //system("PAUSE"); //Debug
  86   return 0;
  87 }