Gzip problem

[ErieGuy]

I had been using Gzip in one application for compression and Gunzip in
another application to decompress the data produced by Gzip.  This
worked without problems.  I now have to use a different application
written in C# to decompress the data produced by Gzip.  I find that
the C# library is unable to decompress the data produced by Gzip.  I
also tried to use WinZip and 7-Zip to decompress the data and these
also report the file as corrupt.  I used WinHex to look at the file I
produced from Gzip and see that the Checksum in the Gzip trailer
doesn't match the checksum produced by WinZip, 7-Zip or a standalone
CRC utility.  The size in the trailer matches the original file size
however.  I don't believe that this is the only problem though.  I can
partially decompress large files with the C# library and see that
initially the decompression looks good, with incorrect characters
being slowly introduced and then finally an exception is thrown.  I've
tried this with VS2008 and VS2005 on XP and Vista.  The same results
are produced regardless of compiler or OS.  Is there a bug in Gzip?
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the "Crypto++ Users" Google Group.
To unsubscribe, send an email to cryptopp-users-unsubscribe@....
More information about Crypto++ and this group is available at http://www.cryptopp.com.
-~----------~----~----~----~------~----~------~--~---

[Jeffrey Walton-3]

> I used WinHex to look at the file I produced from Gzip
> and see that the Checksum in the Gzip trailer doesn't match
> the checksum produced by WinZip, 7-Zip or a standalone
> CRC utility.  The size in the trailer matches the original file
> size however.

Use the 'gz' file extension for the archive and WinRar. Otherwise, I
believe WinZip is the problem - WinZip incorrectly states that the
archive is damaged.

Jeff

On 7/27/09, ErieGuy <locominera@...> wrote:

>
> I had been using Gzip in one application for compression and Gunzip in
> another application to decompress the data produced by Gzip.  This
> worked without problems.  I now have to use a different application
> written in C# to decompress the data produced by Gzip.  I find that
> the C# library is unable to decompress the data produced by Gzip.  I
> also tried to use WinZip and 7-Zip to decompress the data and these
> also report the file as corrupt.  I used WinHex to look at the file I
> produced from Gzip and see that the Checksum in the Gzip trailer
> doesn't match the checksum produced by WinZip, 7-Zip or a standalone
> CRC utility.  The size in the trailer matches the original file size
> however.  I don't believe that this is the only problem though.  I can
> partially decompress large files with the C# library and see that
> initially the decompression looks good, with incorrect characters
> being slowly introduced and then finally an exception is thrown.  I've
> tried this with VS2008 and VS2005 on XP and Vista.  The same results
> are produced regardless of compiler or OS.  Is there a bug in Gzip?

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the "Crypto++ Users" Google Group.
To unsubscribe, send an email to cryptopp-users-unsubscribe@....
More information about Crypto++ and this group is available at http://www.cryptopp.com.
-~----------~----~----~----~------~----~------~--~---