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Bugfix/pypdf4/530 #96

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if not self.strict, ignore a /Prev entry with the value 0 in the trailer
vashek May 12, 2021
96c474b
Merge remote-tracking branch 'myfork/bugfix/530' into bugfix/pypdf4/530
vashek May 12, 2021
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9 changes: 9 additions & 0 deletions pypdf/pdf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2514,6 +2514,15 @@ def usedBefore(num, generation):
else:
break
else:
# Some PDFs have /Prev=0 in the trailer, instead of no /Prev.
if startxref == 0:
if self.strict:
raise utils.PdfReadError("/Prev=0 in the trailer (try"
" opening with strict=False)")
else:
warnings.warn("/Prev=0 in the trailer - assuming there"
" is no previous xref table")
break
# Bad xref character at startxref. Let's see if we can find
# the xref table nearby, as we've observed this error with an
# off-by-one before.
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