CRC error not reported when unzipping a bad archive

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DDTerr
Posts: 3
Joined: 23.01.2008, 16:22
Location: Prague

CRC error not reported when unzipping a bad archive

#1 Post by DDTerr » 01.07.2011, 10:28

Yesterday I found a dangerous bug. I tried to unzip an archive with FreeCommander 2009.2b and all 3 files seemed to be unzipped correctly. But then I tried the same thing with 7-zip and IZarc and both reported a CRC errror for the largest binary file. I double-checked the bad BIN file with a new BIN file unpacked from a good ZIP archive (sent to us by our customer lately) in a hex-editor HxD and there was 3 differences - changed bytes from 00 to 01. Probably a bad RAM chip caused that during zipping or sending the ZIP file by FTP.

I think this error should be corrected ASAP, because it can cause problems to many people working with FTP and ZIP files. I can send you a screenshot prooving the wrong behaviour. Send me a message/email if you want it.

Yes, I forgot... Big thank you for your great FreeCommander :-)

Marek
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Joined: 10.04.2006, 09:48
Location: Germany
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Re: CRC error not reported when unzipping a bad archive

#2 Post by Marek » 06.07.2011, 21:57

Hi,

could you send me such corrupted file or could you test the file with FreeCommander XE?

DDTerr
Posts: 3
Joined: 23.01.2008, 16:22
Location: Prague

Re: CRC error not reported when unzipping a bad archive

#3 Post by DDTerr » 08.07.2011, 13:18

Marek wrote:Hi,

could you send me such corrupted file or could you test the file with FreeCommander XE?
The email with the requested ZIP file attached has been sent to your info@... email. Please confirm you have received it. Thanks.

Marek
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Re: CRC error not reported when unzipping a bad archive

#4 Post by Marek » 08.07.2011, 17:12

Thanks for the file!

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