Originally reported by: Philippe Lagadec (Bitbucket: decalage, GitHub: decalage2)

reported on http://www.decalage.info/en/python/olefileio#comment-481

I passed a file() to OleFileIO() and got an error in this line 979:
filesize = os.path.getsize(filename)
but in line 847 you check for a file object
if hasattr(filename, 'read'):

Potential solutions:

• use name method of file object before calling getsize (only works with real files)
• use seek(os.SEEK_END) then tell (only works with seekable file objects)
• do not allow file-like objects
• read all data then check len

I think the seek/tell solution is the most appropriate, since other parts of the code require seekable file objects anyway. Non-seekable file objects could be read into memory and converted to a StringIO beforehand.

• Bitbucket: https://bitbucket.org/decalage/olefileio_pl/issue/8