Tilman Hausherr created PDFBOX-6159:
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Summary: symInRefSize not respected in Huffmann decoding variant
Key: PDFBOX-6159
URL: https://issues.apache.org/jira/browse/PDFBOX-6159
Project: PDFBox
Issue Type: Sub-task
Components: JBIG2
Affects Versions: 3.0.4 JBIG2
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Fix For: 3.0.5 JBIG2
After not progressing with Huffmann related problems (and working on
bitmap-symbol-symhuffrefine-textrefine.jbig2), I had a look at the code by Nico
Weber
https://github.com/SerenityOS/serenity/blob/master/Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.cpp#L1560
he reads symInRefSize bytes into a buffer after reading the size. The oiginal
levigo code just decodes and ignores the value, i.e. assumes that it will land
at the correct position.
Thus the start position in my recent change should be another one than the one
I assumed (after debugging "good" results), but then many that worked now
failed like this:
Refinement bitmap bytes expected: 28, bytes read: 26
So either all these reads are wrong (although look ok), or the amount of bytes
reserved is slightly too high, which is harmless.
Thus I'll change it so that it checks only for an "overshoot" and seeks to the
correct position after read.
And suddenly lots of files were rendered properly!
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