[pywin32-bugs] [ pywin32-Bugs-979270 ] SetFilePointer fails with negative offset

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Bugs item #979270, was opened at 2004-06-24 23:03
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Category: win32
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Patrick Mezard (trickos)
Assigned to: Nobody/Anonymous (nobody)
Summary: SetFilePointer fails with negative offset

Initial Comment:
I failed to make SetFilePointer work with negative
offsets (using FILE_CURRENT or FILE_END) where the
equivalent C call works correctly. The attached code
demonstrates the problem.

Running it returns:

######################
Traceback (most recent call last):
  File "test_win32file.py", line 34, in ?
    assert s==data
AssertionError
######################

Making wild guess about the C++ code, I would say the
routine/macro decoding or repacking the Py_LARGEINTEGER
 into a pair of (LONG,LONG) might mess with
signed/unsigned integers. I have no debugging proof to
support that claim though.

I tested with the package provided with "Python 2.3.2
(#49, Nov 13 2003, 10:34:54) [MSC v.1200 32 bit
(Intel)] on win32", Windows XP Pro SP1.

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