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Pack the permissions (the /P entry) as unsigned long, fix #186 #352

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merged 7 commits into from
Jan 7, 2020
Merged

Pack the permissions (the /P entry) as unsigned long, fix #186 #352

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90a366b
Tread the permissions (the /P entry) as unsigned long, fix #186
Recursing Jan 5, 2020
cd6d425
handle negative values for p
Recursing Jan 6, 2020
1b4e2b9
Extract function for resolving an twos-complement
pietermarsman Jan 7, 2020
f566546
Add test for issue #352
pietermarsman Jan 7, 2020
264f6c7
Add line to CHANGELOG.md
pietermarsman Jan 7, 2020
066314a
Only ints can be converted to a uint using two's-complement method
pietermarsman Jan 7, 2020
7fb9826
Standardize import style; multiple imports from same module on one line
pietermarsman Jan 7, 2020
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4 changes: 3 additions & 1 deletion pdfminer/pdfdocument.py
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Original file line number Diff line number Diff line change
Expand Up @@ -348,7 +348,9 @@ def compute_encryption_key(self, password):
password = (password + self.PASSWORD_PADDING)[:32] # 1
hash = md5.md5(password) # 2
hash.update(self.o) # 3
hash.update(struct.pack('<L', self.p)) # 4
# See https://github.com/pdfminer/pdfminer.six/issues/186
unsigned_p = self.p if self.p > 0 else self.p + (1 << 32)
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hash.update(struct.pack('<L', unsigned_p)) # 4
hash.update(self.docid[0]) # 5
if self.r >= 4:
if not self.encrypt_metadata:
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