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Message-ID:	<3BC48153.3010505@likai.net>
Date:	Wed, 10 Oct 2001 13:11:47 -0400
From:	Li-Kai Liu <news AT likai DOT net>
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To:	cygwin AT cygwin DOT com
Subject:	Re: unbelievably filesize
References:	<Pine DOT CYG DOT 4 DOT 30 DOT 0110101204220 DOT 1344-100000 AT dev9 DOT wohnfinder DOT de>

w DOT peppmeyer AT wohnfinder DOT de wrote:

>hi,
>
>at a win2k box ls and du are showing the following
>
>$ ls -l fileserver_voll.bkf
>-rw-r--r--    1 w.peppme Entwickl 18446744072396582912 Sep 20 14:14 fileserver_v
>oll.bkf
>$ du -b fileserver_voll.bkf
>2981998592      fileserver_voll.bkf
>
>the real filesize is 7.276.965.888 bytes and 5.983.522.816 bytes on disk
>with ntfs compression enabled. the file is mounted from another
>win2k box.
>
>have a nice day
>
obviously some sort of overflow ... i've determined how you get this 
number 18446744072396582912 ...

18446744072396582912 = 0xffffffff00000000 | (7276965888 & 0xffffffff )

it is probably the result of trying to sign extend a already overflowed 
32-bit integer. somewhere along the line, the file size is casted to a 
32-bit signed integer, and then recasted to a 64-bit signed integer. 
don't bother launching the debugger.

liulk



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