ROB: Improve handling of LZW decoder table overflow#3159
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stefan6419846 merged 2 commits intopy-pdf:mainfrom Feb 27, 2025
Merged
ROB: Improve handling of LZW decoder table overflow#3159stefan6419846 merged 2 commits intopy-pdf:mainfrom
stefan6419846 merged 2 commits intopy-pdf:mainfrom
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Generate the test file: Comment pypdf/pypdf/_codecs/_codecs.py Line 97 in 6003a1e import string
from pypdf._codecs._codecs import LzwCodec
data = string.printable + string.printable[::-1]
for _ in range(8):
data += data
data = data[:-12410]
codec = LzwCodec()
encoded = codec.encode(data.encode())
with open('resources/lzw_decoder_table_overflow.bin', mode='wb') as fd:
fd.write(encoded) |
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #3159 +/- ##
=======================================
Coverage 96.53% 96.53%
=======================================
Files 53 53
Lines 8909 8914 +5
Branches 1633 1634 +1
=======================================
+ Hits 8600 8605 +5
Misses 185 185
Partials 124 124 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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## What's new ### Bug Fixes (BUG) - Use the correct name StandardEncoding for the predefined cmap (#3156) by @stefan6419846 - Handle inline images containing `EI ` sequences (#3152) by @stefan6419846 - Fix check box value which should be name object (#3124) by @stefan6419846 - Fix stream position on inline image fallback extraction (#3120) by @stefan6419846 - Fix object count for incremental writer (#3117) by @m32 ### Robustness (ROB) - Avoid index errors on empty lines in xref table (#3162) by @stefan6419846 - Improve handling of LZW decoder table overflow (#3159) by @stefan6419846 - Ignore non-numbers for width when building font width map (#3158) by @stefan6419846 - Avoid negative seek values when reading partially broken files (#3157) by @stefan6419846 ### Documentation (DOC) - Fixed PageObject.images example usage for replacing image (#3149) by @jutoth [Full Changelog](5.3.0...5.3.1)
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Closes #3032.