Recover Jpeg files from raw data - jpeg

Question

I need to recover jpeg files from a memory card (raw data). I have done the code below but I am getting a seg fault which i cannot identify the source. Just to summarize, I´ve done a loop to read 512bytes chunks and look for specific jpeg header. If it is the first jpeg, the programa will open a file and keep writing to it. If jpeg is not the first, close previous image and keep writing to it.
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char *argv[])
{
// Check usage
if (argc != 2)
{
printf("Usage: ./recover image\n");
return 1;
}
// Open file
FILE *file = fopen(argv[1], "r");
if (!file)
{
fprintf(stderr, "Could not open %s.\n", argv[1]);
return 1;
}
// open array to store the chunks with enough memory
unsigned char buffer [512];
// variables jpeg count
int img_count = 0;
// open filename img to write to
char filename[8];
FILE *img = NULL;
// create loop to read 512 chunks
while (fread(buffer, 512, 1, file) > 0)
{
if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] & 0xf0) == 0xe0)
{
// if theres already a jpeg open
if (img_count > 0)
{
fclose(img);
sprintf(filename, "%i03.jpg", img_count);
img = fopen(filename, "w");
img_count++;
} // first jpeg img count == 0
else if (img_count == 0)
{
sprintf(filename, "%i03.jpg", img_count);
img = fopen(filename, "w");
img_count++;
}
}
//if this is not a new jpeg header, just write to img
if (img_count > 0)
{
fwrite(buffer, 512, 1, img);
}
else
{
continue;
}
}
fclose(img);
fclose(file);
return 0;
}

Answer 1

Found it...typo i had "%i03.jpg" instead of %03i.jpg"