Recover image

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

 typedef uint8_t BYTE;

 #define BLOCKSIZE 512


 int main(void)
 {
    // define 512 byte block
    BYTE block[BLOCKSIZE];

    // open memory card
    FILE* fp = fopen("card.raw", "r");

    // check if file opened
    if (fp == NULL)
    {
        printf("Error opening file\n");
        return 1;
    }
    // open output file
    FILE* outfile;
    outfile = NULL;
    int num = 0;
    char filename[14];
    int x = 0;
    int y = 512;

    // main block till end of file
    while (y == 512)
    {
        if ( x == 0)
        {
        // read every 512 block
        fread(&block, sizeof(block), 1 , fp);
        }

        // if 4 first characters jpg
        if ((block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && block[3] == 0xe0) || (block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && block[3] == 0xe1))
        {
            sprintf(filename, "%03d_output.jpg", num);
            outfile = fopen(filename, "a");
            fwrite(&block, sizeof(block), 1, outfile);
            //fseek(fp, sizeof(block), SEEK_CUR);

            fread(&block, sizeof(block), 1 , fp);
            while (!((block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && block[3] == 0xe0) || (block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && block[3] == 0xe1)))
            {
                fwrite(&block, sizeof(block), 1, outfile);
                y = fread(&block, sizeof(block), 1, fp);
            }
            //fseek(fp, -(sizeof(block)), SEEK_CUR);
            fclose(outfile);
            num++;
            x = 1;
            //y = fread(&block, sizeof(block), 1, fp);
        }
        //printf("%s\n", block);

    }

    // close memory card
    fclose(fp);

    return 0;
 }