ROB: Avoid empty FlateDecode outputs without warning #3579
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3579 +/- ##
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Coverage 97.16% 97.16%
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Files 56 56
Lines 9808 9813 +5
Branches 1790 1791 +1
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+ Hits 9530 9535 +5
Misses 167 167
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stefan6419846
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Jan 9, 2026
## What's new ### Security (SEC) - Improve handling of partially broken PDF files (#3594) by @stefan6419846 ### Deprecations (DEP) - Block common page content modifications when assigned to reader (#3582) by @stefan6419846 ### New Features (ENH) - Embellishments to generated text appearance streams (#3571) by @PJBrs ### Bug Fixes (BUG) - Do not consider multi-byte BOM-like sequences as BOMs (#3589) by @stefan6419846 ### Robustness (ROB) - Avoid empty FlateDecode outputs without warning (#3579) by @stefan6419846 ### Documentation (DOC) - Add outlines documentation and link it in User Guide (#3511) by @mainuddin-md ### Developer Experience (DEV) - Add PyPy 3.11 to test matrix and benchmarks (#3574) by @rassie ### Maintenance (MAINT) - Fix compatibility with Pillow >= 12.1.0 (#3590) by @stefan6419846 [Full Changelog](6.5.0...6.6.0)
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It took me rather long to debug
for a stream which looked completely fine. It turned out to be an invalid FlateDecode stream which we could not decode, thus converting an non-empty content stream into an empty one. With this PR, we at least forward the corresponding warning, although only once per warning type to not flood the application logs.