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Fix a crash when all 64 bits in timestamp are 1 (#22)

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We've found some .msg files in the wild that have a CREATION_TIME that
has all 64 bits set: 9223372036854775807.

Adding this number of 100ns intervals to the base timestamp of
1601-01-01 results in a timestamp somewhere in the year 30828 which is
not supported by Python's datetime module, as datetime.MAXYEAR is
currently 9999.

Co-authored-by: Martijn van de Streek <martijn.vandestreek@exxellence.nl>
This commit is contained in:
Martijn van de Streek
2022-02-10 17:41:08 +01:00
committed by GitHub
parent 64c07db5b0
commit 5fa8976f86
1 changed files with 5 additions and 1 deletions
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outlookmsgfile.py
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@@ -293,7 +293,11 @@ class INTTIME(FixedLengthValueLoader):
# 100-nanosecond intervals since January 1, 1601. # 100-nanosecond intervals since January 1, 1601.
from datetime import datetime, timedelta from datetime import datetime, timedelta
value = reduce(lambda a, b : (a<<8)+b, reversed(value)) # bytestring to integer value = reduce(lambda a, b : (a<<8)+b, reversed(value)) # bytestring to integer
try:
value = datetime(1601, 1, 1) + timedelta(seconds=value/10000000) value = datetime(1601, 1, 1) + timedelta(seconds=value/10000000)
except OverflowError:
value = None
return value return value
# TODO: The other fixed-length data types: # TODO: The other fixed-length data types: