New JPEG decoder available for testing

Hi everybody,

coreboot has a "bootsplash" feature that allows showing an image on the 
screen relatively early during boot (although rather late in terms of 
coreboot). It comes with a JPEG decoder that served us for last nearly 
20 years, although it is rather limited: It only supports a subset of 
JPEG's features, so care had to be taken to pre-process the bootsplash 
image in just the right way for the decoder to accept it.

It was also somewhat fragile: util/fuzz-tests/ ships a test harness for 
our JPEG API, and afl-fuzz++ runs into lots of crashes with that decoder.

Enter Wuffs[0]: It's a programming language tailored towards processing 
"some piece of data" into "another piece of data", with very strict 
semantics. It comes with a standard library implementing all kinds of 
things that fit that category from deflate decompression to jpeg.
Its compiler emits portable C code, so we don't need to support the 
language in the coreboot environment at all.

https://review.coreboot.org/78271 integrates a pre-release version of 
Wuffs, replacing our jpeg decoder with the one from there.

If you're dealing with bootsplashes, I'd appreciate testing on your 
image files to see how well it fares.


Regards,
Patrick

PS: Many thanks to Nigel Tao, Wuffs' principal author, who dug through 
the complications of relicensing the project so it becomes compatible 
with GPLv2, enabling this integration.

[0] https://github.com/google/wuffs
_______________________________________________
coreboot mailing list -- [email protected]
To unsubscribe send an email to [email protected]