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Re: An alternative to gdk-pixbuf




On Tue, 11 Sep 2018 00:07:27 +0200
Bastien Nocera <hadess@xxxxxxxxxx> wrote:

> On Mon, 2018-09-10 at 22:29 +0200, Magnus Bergman wrote:
> > On Mon, 10 Sep 2018 11:31:42 +0200
> > Bastien Nocera <hadess@xxxxxxxxxx> wrote:
> >   
> > I do use a library (or two). I've written one plugin that uses
> > giflib and one that uses ImageMagick. I assumed using giflib would
> > be a straighter path, but it wasn't. Firstly it only supports
> > reading images
> > from disk (but abydos automatically creates temporary files then
> > needed
> > so that didn't add any extra code at least). Secondly it doesn't do
> > much more than unpacking the pixels. How to interpret what comes out
> > is
> > left as an exercise for the user, and requires a bit of knowledge
> > about
> > the GIF formats and it's quirks. So that plugin isn't built by
> > default.
> > ImageMagick on the other hand did much more to be of help, and
> > required
> > far less code to use. So shifting the responsibility to ImageMagick
> > seems reasonable, I think.  
> 
> No, it really isn't:
> https://www.cvedetails.com/vulnerability-list/vendor_id-1749/Imagemagick.html
> 
> We want to have less CVEs, not more.

I see what you mean. A few of them (although none of the more serious
ones) were even related to the GIF loader specifically. But the sheer
volume kind of speaks for itself otherwise. :(

> > I tested them both on all the GIF images included in the gdk-pixbuf
> > test suit. Both plugins mostly work, but to varying degree. The one
> > based on giflib segfaults with 1_partyanimsm2.gif (because the
> > allocation containing the pixels which giflib provides is less than
> > the
> > images width x height, I haven't yet looked deeper into it). The
> > ImageMagick based plugin on the other doesn't crash at least, and
> > all the invalid images are correctly classified as invalid. The
> > image 1_partyanimsm2.gif still shows as garbage except the first
> > frame. The image aero.gif has the frame delay set to zero for every
> > frame but the
> > first. I'm not sure how that should be interpreted, so I simply
> > exchanged zero values for a small delay (0.02 seconds). I will read
> > up
> > on the GIF format and hopefully get things working better.
> > 
> > It's available here if you want to try it out:
> > http://snisurset.net/code/abydos/  
> 
> Having looked at giflib, and knowing the author, the current plan
> still is to have something based on libnsgif in the future.

I guess I'll write a third GIF plugin based libnsgif then.
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