Yes, of course I understand the issue of partial support. But nevertheless it doesn't make sense to pass a raw to LibRaw for decoding when the camera's not supported. So while the camera list isn't perfect (and I do understand that), in the absence of any other means to make that determination, that's what I have to do.

Clearly if there's the possibility of a better solution that could be implemented in the future, I'd be very happy to use that.

All the best

So what is the preferred method of determining if the camera is supported if not that.

Thanks
David

To solve the issue of reading EXIF copyright data using the C-API, I added a simple function in libraw_c_api.c:

  DllDef int libraw_datastream_read(void *ifp, void *ptr, size_t size, size_t nmemb)
  {
    if (!ifp)
      return -1;
    return ((LibRaw_abstract_datastream *)ifp)->read(ptr, size, nmemb);
  }

Then from my application I can call that function from the exifparser callback installed using libraw_set_exifparser_handler.

Simple and easy.
Of course other similar functions may be added to call various LibRaw_abstract_datastream methods .

I wrote the code to install the callback and the callback gets called when a RAW file is read. Now, from the callback, when the wanted tag is seen, how to I call the datastream read method to read the tag value. The call back receive a pointer to LibRaw_abstract_datastream input stream. The question is how the datastream read method is called from the callback code which is [equivalent to] C code and as such has to use LibRaw C-API. I don't see anything in LibRaw C-API to use a datastream.

That is not a question related to Delphi but related to LibRaw C-API.
The question is: Using LibRaw C-API, how to call the datastream reader to read an EXIF tag value from the exif parser callback.

I have setup an exif parser callback. I correctly receive the copyright tag. I assume I have to read his value using passed ifp argument (The pointer to LibRaw_abstract_datastream input stream, positioned to start of data). But how can I do that using the C API?

Context: My program is written with Delphi which can use any C-API from DLL, but Delphi can't use C++ objects.

Thanks. I will try using EXIF callback. I come here again if I can't make it work.
Regards

Exif tag 0x8298 is not parsed by LibRaw

Thanks.

:Jack

return this->operator[](_fpos - _bstart);

We are happy to accept additions if they do not violate the general ideology of the library and solve a problem of interest to more than one user.
Please use github pull requests for such a contributions.

Delphi/other language wrappers are out of our interest because we'll unable to support such improvements.