Nico Weber df9dd8ec69 LibGfx/JBIG2: Add arithmetic coding decoder ...

I think the context normally changes for every bit. But this here
is enough to correctly decode the test bitstream in Annex H.2 in
the spec, which seems like a good checkpoint.

The internals of the decoder use spec naming, to make the code
look virtually identical to what's in the spec. (Even so, I managed
to put in several typos that took a while to track down.)

2024-03-14 18:18:15 -06:00

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