#include <stdio.h>
#include <stdlib.h>
#include <cs50.h>
#include <unistd.h>

int main(int argc, char* argv[])
{
    //ensure proper usage
    if (argc != 2)
    {
        printf("Usage: ./recover card.raw\n");
        return 1;
    }

    char* infile = argv[1];

    // open input file (r = read)
    FILE* inptr = fopen(infile, "r");
    if (inptr == NULL)
    {
        printf("Could not open %s.\n", infile);
        return 2;
    }

    int buffer[512];

    for (int i = 0; i != -1; i++)
    {
        fread(&buffer,1,512,inptr);

        if (buffer[0] == 0xff &&
            buffer[1] == 0xd8 &&
            buffer[2] == 0xff &&
            (buffer[3] & 0xf0) == 0xe0)
            {
                printf("JPEG found\n");
                break;
            }
            printf("Iteration #%i No JPEG\n", i);
    }
}