PSET 4 - Recover.c only recovering one empty file

Question

My code compiles and actually recovers 1 single image, an empty one, then it quits. I suspect the issue is related to the amount of bytes I'm reading from card.raw, but I can't be sure. I tried moving things around a lot, always get the Seg Fault. This is the only configuration that I was able to compile and run without errors, but I only get the lonely 000.jpg in the directory. Anyone can tell me what I am doing wrong? I used copy.c as a base for my code. And I left the "sanity checks" for the opening / closing of files out, here, to save space.

        // remember filenames
        char* infile = "card.raw";
        char title[8]; //leave room for \0
        uint8_t buffer[512];

        // open input file 
        FILE* inptr = fopen(infile, "r");

        // create output file for new JPG file
        FILE* outptr = 0;

        // loop through card.raw 
        for (int i = 0; i < *infile; i++)
        {
        // number of recorded files tracker
        int counter = 0;

          if (fread(&buffer, 512, 1, inptr) == 1)
          {
            if ((buffer[0] == 0xff) && (buffer[1] == 0xd8) && (buffer[2] == 0xff) && ((buffer[3] == 0xe0) || (buffer[3] == 0xe1))) 
            {
              // create new title for new JPG file
              sprintf(title, "%.3d.jpg", counter);

              // make new JPG file
              outptr = fopen(title, "a");

              // write 512 bytes 1 by 1 to new JPG file
              fwrite(&buffer, 512, 1, outptr);   

              // close new JPG file
              fclose(outptr);
            }
            counter++;
          }
        }

        // close card.raw
        fclose(inptr);

        // that's all folks
        return 0;

Answer 1

infile is a string, it's content is the expression "card.raw".

So what exactly is this loop supposed to accomplish?

for (int i = 0; i < *infile; i++)