int main(int argc, char *argv[])
{
    // keep filenames
    char    *infile = argv[1],
            *outfile = NULL;
    FILE    *inptr = fopen(infile, "r"),
            *outptr = NULL;
    BYTE    *byte_array = malloc(512 * sizeof(BYTE));
    int     filename_counter = 0;


    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    // program works only with initialized outfile - remove this part and it crashes on sprintf
    outfile = malloc(sizeof("000.jpg") + 1);
    sprintf(outfile, "%03i.jpg", filename_counter);
    outptr = fopen(outfile, "w");
    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


    /**
    * CODE
    * CODE
    * CODE
    **/

    if (header_is_jpeg(inptr))
    {
        create_new_outfile(&outfile, &outptr, &filename_counter);
    }

    // only keep reading if block is proper size (512)
    while (fread(outptr, 1, 512, inptr) == 512)
    {
        // rewind seek
        fseek(inptr, -512, SEEK_CUR);

        // read and write 512 bytes, 1 byte at a time
        for(int i = 0, arr_size = sizeof(byte_array); i < arr_size; i++)
        {
            fread(&byte_array[i], 1, 1, inptr);
                /**
                * !!!!!!!!!!!!!!!!!!!!!!!
                * CODE CRASHES HERE
                * !!!!!!!!!!!!!!!!!!!!!!!
                **/

            fwrite(&byte_array[i], 1, 1, outptr);
        }

    }

    // close files
    fclose(inptr);
    fclose(outptr);
    return 0;
}


int header_is_jpeg(FILE *memcard)
{
    /**
    * CODE
    * CODE
    * CODE
    **/
}

void create_new_outfile(char **outfile, FILE **outptr, int *filename_counter)
{
    // if a file is open - close the old one before creating new one
    if (*outptr != NULL)
    {
        printf("Recovered image: %s\n", *outfile);
        fclose(*outptr);
        free(*outfile);
    }

    // create new output file
    *outfile = malloc(sizeof("000.jpg") + 1);
    sprintf(*outfile, "%03i.jpg", *filename_counter+3);
    *outptr = fopen(*outfile, "w");
    (*filename_counter)++;

}