ROB: Avoid divison by zero when decoding FlateDecode PNG prediction#3641
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stefan6419846 merged 2 commits intopy-pdf:mainfrom Feb 16, 2026
Merged
ROB: Avoid divison by zero when decoding FlateDecode PNG prediction#3641stefan6419846 merged 2 commits intopy-pdf:mainfrom
stefan6419846 merged 2 commits intopy-pdf:mainfrom
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Previously, calculating `bpp` could raise a ZeroDivisionError due to invalid column values. The validation has been extended in accordance to the PDF specification which requires these values to always be positive. Some additionally refactoring has been included to simplify the existing code and drop the exception handling where possible when retrieving the parameters.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3641 +/- ##
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+ Coverage 97.34% 97.36% +0.01%
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Files 55 55
Lines 9882 9879 -3
Branches 1806 1807 +1
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- Hits 9620 9619 -1
+ Misses 153 151 -2
Partials 109 109 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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## What's new ### Security (SEC) - Detect cyclic references when accessing TreeObject.children (#3645) by @stefan6419846 - Limit size of `/ToUnicode` entries (#3646) by @stefan6419846 - Limit FlateDecode recovery attempts (#3644) by @stefan6419846 ### Bug Fixes (BUG) - Avoid own object replacement logic in `PageObject.replace_contents` (#3638) by @stefan6419846 - Fix UnboundLocalError when update_page_form_field_values with /Sig (#3634) by @John-Sharp ### Robustness (ROB) - Avoid divison by zero when decoding FlateDecode PNG prediction (#3641) by @stefan6419846 [Full Changelog](6.7.0...6.7.1)
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Previously, calculating
bppcould raise a ZeroDivisionError due to invalid column values. The validation has been extended in accordance to the PDF specification which requires these values to always be positive.Some additionally refactoring has been included to simplify the existing code and drop the exception handling where possible when retrieving the parameters.