file size limit exceeded/corrupted jpgs on recover

So I've managed to get a semi-working code for recover

basically it's

//open card file (hard coded)

//make var for keeping count of jpg

//declare a BYTE as an unsigned 8 bit int
//declare an array called buffer of size 512 BYTEs  

//declare a second buffer to break the while loop

//declare a FILE pointer called img to write the buffer data into

//declare a char array (photo) of size 3 to contain the  
//resulting 3 char 'xxx.jpg' string to sprintf to

//do while true

     //read 512 chunks of file into buffer

     //subscript the first 4 BYTEs and check if they are that of
     //a jpeg

          //if the jpg counter is > 0, meaning we've already 
          //started writing jpegs
               
               //close img file

          //sprint a new jpeg photo name 

          //open that jpeg photo name and bind to img pointer 

          //write current 512 block in buffer into img     

          //increment jpg counter +1

     //else if above is false and jpg counter > 0

          //write current 512 byte block in buffer into img


     //else if fread of second buffer returns a 1 meaning
     //we've reached the end of file

          //break out of the loop 

The first problem is that I only get 40 files. The last of which, 039.jpg, I can't actually open because it is massive 536870912 bytes which is bigger than the allowed 8MBs.

The second one is that if I try to open the files to take a look at them, I see assembly code. Or at least what I assume is assembly code with pink looking lines and white question marks inside a black diamond. They are not an actual jpg file.

The third issue is that if I list the items in my terminal, they appear with a trailing question mark, i.e. 000.jpg? 001.jpg? etc. If I try to delete them by rm -f *.jpg it says that there is no current such file in my directory, even though I can clearly see them listed there.

I am also unable to view the file headers using xxd because like I said before, I can't actually access the files since according to the terminal, they don't exist.

I appreciate any help I can get.