ROB: Deal with wrong size for incremental PDF files#3495
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stefan6419846 merged 2 commits intopy-pdf:mainfrom Oct 16, 2025
Merged
ROB: Deal with wrong size for incremental PDF files#3495stefan6419846 merged 2 commits intopy-pdf:mainfrom
stefan6419846 merged 2 commits intopy-pdf:mainfrom
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3495 +/- ##
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Coverage 97.09% 97.09%
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Files 56 56
Lines 9658 9664 +6
Branches 1748 1750 +2
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+ Hits 9377 9383 +6
Misses 168 168
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stefan6419846
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## What's new ### Bug Fixes (BUG) - Fix handling of zero-length StreamObject (#3485) by @Likend ### Robustness (ROB) - Deal with wrong size for incremental PDF files (#3495) by @stefan6419846 - Improve handling for malformed cross-reference tables (#3483) by @stefan6419846 ### Developer Experience (DEV) - Use released Python 3.14 by @stefan6419846 - Use Mapping instead of dict in type hint of update_page_form_field_values (#3490) by @stefan6419846 [Full Changelog](6.1.1...6.1.2)
OpenNingia
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Oct 23, 2025
OpenNingia
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Oct 23, 2025
## What's new ### Bug Fixes (BUG) - Fix handling of zero-length StreamObject (py-pdf#3485) by @Likend ### Robustness (ROB) - Deal with wrong size for incremental PDF files (py-pdf#3495) by @stefan6419846 - Improve handling for malformed cross-reference tables (py-pdf#3483) by @stefan6419846 ### Developer Experience (DEV) - Use released Python 3.14 by @stefan6419846 - Use Mapping instead of dict in type hint of update_page_form_field_values (py-pdf#3490) by @stefan6419846 [Full Changelog](py-pdf/pypdf@6.1.1...6.1.2)
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There are incremental PDF files in the wild which define a too small
/Sizein the final part.I have initially seen this with an incremental PDF file where no object has been updated and the
/Sizeset to 1, although the previous/Sizewould be 24. During analysis, it turned out that loading the same PDF file in incremental mode would not fail, but with/Size 2(due to subtracting 1 in this path).I could not see any negative side effects when changing this for non-incremental writer mode in pypdf, thus the assertion appears to be too strict here. Instead, replace the assertion with a proper error/warning message and report proper errors on an index error when attempting to flatten the faulty PDF in incremental mode.