invalid memory access

[alexlocher]

Hi Mayank
Thanks for the nice and lightweigtht exif library!

I just run into the situation where a 'std::length_error' on string resize was thrown. It boils down to the following line in exif.cpp:350

      if (result.val_string()[result.val_string().length() - 1] == '\0') {
        result.val_string().resize(result.val_string().length() - 1);
      }

The length of val_string() is not guaranteed to be > 0 and in my case it happend to be empty (resulting in an invalid memory access). The fix is easy:

      if (!result.val_string().empty() && result.val_string()[result.val_string().length() - 1] == '\0') {
        result.val_string().resize(result.val_string().length() - 1);
      }

Cheers & have a nice day
Alex

[ryuchihoon]

The same issue here.
Your fix is correct. Thank you !