Michael Natterer <[EMAIL PROTECTED]> writes:

> An alternative to implementing our own vfs would be to entirely
> hide file handling from file plug-ins, for example by passing them
> already opened GIOChannels which they would use to read/write.
> It woud be easily possible to make the IO channels use some vfs
> layer and the plug-ins wouldn't even notice.
> While this would make "straightforward" file plug-ins (which just
> open, read sequentially, close) much easier to implement, it is
> problematic for plug-ins which want to seek around in the files
> a lot (like jpeg.c). GIOChannel has a seeking API, but we cannot
> guarantee that for all vfs backends we may want to use.

Unfortunately some image file libraries work directly on a file
descriptor. Only if the library provides a stream API, can the plug-in
easily be ported to use GIOChannels. We would have to evaluate if this
is the case for libjpeg, libpng, libtiff and the other major image
file libraries we are using.

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