RE: Corrupted file on a copy

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Wed, 14 Sep 2005, David Sanchez wrote:

> Unfortunately, the cmp command shows me a difference between the 2 files!
> I known that it is a strange behaviour and that probably come from my code but I don't find it yet :(
> More, I try the last linux kernel 2.6.13 from linux-mips.org with the last busybox version and the problem persists!
>

Yes, but 'cmp' can tell you the offset where the bytes differ.
This should let you know if you have "off-by-one" errors, etc., in
your code. For instance, if you have a 64k sized buffer and your
first bad byte offset is at 0xffff, then that should tell you
something (like the code logic has interchanged length and offset).


>
> David SANCHEZ
> LexBox :: The Digital Evidence
> 3, avenue Didier Daurat
> 31400 TOULOUSE / FRANCE
> david.sanchez@lexbox.fr
> Tel :  +33 (0)5 62 47 15 81
> Fax : +33 (0)5 62 47 15 84
> -----Message d'origine-----
> De : linux-os (Dick Johnson) [mailto:linux-os@analogic.com]
> Envoyé : mercredi 14 septembre 2005 16:46
> À : David Sanchez
> Cc : linux-kernel@vger.kernel.org
> Objet : Re: Corrupted file on a copy
>
>
> On Wed, 14 Sep 2005, David Sanchez wrote:
>
>> Hi,
>>
>> I'm using the linux kernel 2.6.10 and busybox 1.0 on a AMD AU1550 board.
>>
>> When I copy a big file (around 300M) within an ext2 filesystem (even on
>> ext3 filesystem) then the output file is sometime "corrupted" (I mean
>> that the source and the destination files are different and thus
>> generate a different SHA1).
>> Does somebody have a same behaviour?
>>
>> Thanks,
>> David
>>
>
> Use `cmp` to compare the two files. You could have discovered
> a bug in your checksum utility, you need to isolate it to
> the file-system. FYI, I have never seen a copy of a file, including
> the image of an entire DVD (saved to clone another), that was not
> properly identical.
>
>
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.6.13 on an i686 machine (5589.53 BogoMips).
> Warning : 98.36% of all statistics are fiction.
> .
> I apologize for the following. I tried to kill it with the above dot :
>
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>
> Thank you.
>
>
>
>
>
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Cheers,
Dick Johnson
Penguin : Linux version 2.6.13 on an i686 machine (5589.53 BogoMips).
Warning : 98.36% of all statistics are fiction.

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