Re: [Libexif-devel] Parsing TIFF

[Jan P. <pa...@pi...>]

Hi,

I've also started investigating the possibility of parsing TIFFs.
I've come up with more or less 3 solutions, one of them is yours.
None of them is really perfect.
However, I see one big possible drawback.
With this approach, entire TIFF file is treated as EXIF. This means that
entire (possibly multipage) TIFF file is read into memory by
exif_loader_copy(). This can easily be dozens of megabytes.

 -- Jan

> I'm have almost EXIF parsing from TIFF files working from current
> libexif CVS.
> Basically the change is to not copy over the 'Exif\0' marker (6 bytes),
> because it is part of JFIF, not part of the Exif data. Exif data is just
>  TIFF structure, so everything else comes along....
>
> Currently it sort of crashes with TIFF and CR2, but otherwise it works
> with JPEG, at least with the current test suite.
>
> Any comments ?
>
> Hub