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ROB: Relax flate decoding for too many lookup values #2331

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merged 5 commits into from
Dec 10, 2023
Merged

ROB: Relax flate decoding for too many lookup values #2331

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7621d8e
BUG: Relax flate decoding for too many lookup values
stefan6419846 Dec 7, 2023
676abc8
only accept whitespace characters as trailing ones
stefan6419846 Dec 8, 2023
c34e9fc
fix import sort oder
stefan6419846 Dec 8, 2023
73308dc
add test with trailing newline
stefan6419846 Dec 8, 2023
5d3fc66
Merge branch 'main' into relax-flate-lookup
MartinThoma Dec 9, 2023
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9 changes: 8 additions & 1 deletion pypdf/_xobj_image_helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -195,7 +195,14 @@
else:
if img.mode == "1":
# Two values ("high" and "low").
assert len(lookup) == 2 * nb, len(lookup)
if len(lookup) != 2 * nb:
if len(lookup) < 2 * nb:
raise PdfReadError(f"Not enough lookup values: Expected {2 * nb}, got {len(lookup)}.")
logger_warning(

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f"Expected {2 * nb} lookup values, got {len(lookup)}. Ignoring trailing ones.",
__name__,
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lookup = lookup[:2 * nb]

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colors_arr = [lookup[:nb], lookup[nb:]]
arr = b"".join(
[
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