#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    //open card.raw
    FILE* fp1 = fopen("card.raw", "r");
    
    //int to keep track of number of jpg's
    int i = 0;
    
    while(1)
    {   
        //buffer for reading in it
        char* b = malloc(512*sizeof(char));
    
        //reading of the information in the input file
        fread(b, 512, 1, fp1);
        
        //looking for the end of card.raw 
        if(feof(fp1))
            break;
        
        if((atoi(&b[0]) == 0xff && atoi(&b[1]) == 0xd8 && atoi(&b[2]) == 0xff && atoi(&b[3]) == 0xe0) ||
            (atoi(&b[0]) == 0xff && atoi(&b[1]) == 0xd8 && atoi(&b[2]) == 0xff && atoi(&b[3]) == 0xe1))
        {            
            //creating the name of the jpg
            char name[8];
            printf("%.3i.jpg", i);
            sprintf(name, "%.3i.jpg", i);
            name[7] = '\0';
            i++;
            
            //opening jpg
            FILE* fp = fopen(name, "w");
            
            //writing info to jpg
            fwrite(b, 512, 1, fp);
            
            //closing output file
            fclose(fp);
        }
        else
        {
            //skipping first blocks of bytes
            if(i != 0)
            {
                
                //recreating name for a output file   
                char name[8];
                sprintf(name, "%.3i.jpg", i-1);
                name[7] = '\0';
                
                //opening jpg
                FILE* fp = fopen(name, "a");
                
                //writing info to jpg
                fwrite(b, 512, 1, fp);
                
                //closing output file
                fclose(fp); 
            }           
        }
        
        //freeing memory
        free(b);
    }
    
    return 0;
}