.NET System.IO.Compression and zip files

re: .NET System.IO.Compression and zip files

Tim Heron — Wed, 05 Apr 2006 19:06:34 GMT

It's a pity that GZipStream doesn't work with streams over 4GB in size. GNU gzip can cope with >4GB files so why this limitation ? http://www.gzip.org/#faq10

Zip compression library on 2.0 from - All about Interop...

CedarLogic — Wed, 05 Apr 2006 19:53:53 GMT

.NET System.IO.Compression and zip files .NET Zip Library.NET 2.0 does CompressionThere's a new namespace...

re: .NET System.IO.Compression and zip files

TravisOwens — Wed, 05 Apr 2006 20:48:26 GMT

Don't get PKZIP and GZIP confused, while PKZIP came about 2-3yrs before GZIP, GZIP is not a *nix implementation of PKZIP, although both deflators support each other's format.

If .Net is using GZIP's method (which fully works in PKZIP, WinZip, etc) then the licensing is a non issue anyways.

re: .NET System.IO.Compression and zip files

Jeff Parker — Wed, 05 Apr 2006 20:49:48 GMT

Ohhhh, brilliant I was looking for something like this the other day when I was playing in the compression namespace.

.NET System.IO.Compression and zip files

The daily link — Thu, 06 Apr 2006 11:50:46 GMT

re: Don't get PKZIP and GZIP confused

DotNetInterop — Thu, 06 Apr 2006 22:34:02 GMT

Travis, thanks for reminding us all that Gzip and Pkzip are different. I should have pointed that out. Both Gzip (the *nix utility) and Pkzip (the commercial tool) do standard compression (see the IETF RFC's mentioned in the original entry). But Gzip compresses a single file, and pkzip builds compressed archives.
I think you are jumping to conclusions when you suggest that because .NET's compression library uses the Deflate algorithm, there are no IP issues. PKWARE defines the format for .zip files, and that format is theirs to license. They don't have a license on the compression format, but on the surrounding data that describes the multi-file archive.

I contacted PKWARE and they agreed that the usage here is covered under their "free" license terms. But it is still PKWARE's intellectual property, and it is still a license, though I did not pay for it. Keep in mind, I am not a lawyer.
-Dino

re: 4GB Limit

DotNetInterop — Thu, 06 Apr 2006 22:55:40 GMT

Tim, I don't know about the 4GB limit - if it is real, and if so, why it is there.
I would suggest posting to http://forums.microsoft.com/MSDN/showforum.aspx?forumid=39&siteid=1

-Dino

Linkliste 2006-04-08

Nicolai's Blog — Sun, 09 Apr 2006 02:11:01 GMT

Linkliste 08.04.2006

Software
HFS - Http File Server - Ein kleiner Fileserver der keine Installation benötigt. Sourcecode ist auch verfügbar. [via Portable Freeware]

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.NET System.IO.Compression and zip files - Eine Zip Library basierend

XIU’s Blog » Blog Archive » links for 2006-05-03

XIU’s Blog » Blog Archive » links for 2006-05-03 — Wed, 03 May 2006 03:44:25 GMT

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re: .NET System.IO.Compression and zip files

Colin — Wed, 10 May 2006 18:41:15 GMT

Hi

I have managed to implement the zipping of a file, but when I close down my Form, I get a

"System.MissingMethodException". This seems to relate to the zip.Dispose method.

Any ideas on how I can correct this?

Many thanks
Colin

Saving Face

This Old Code — Sat, 17 Feb 2007 06:28:50 GMT

Finding a way to use system.io.compression for zip archives

Creating Zip archives in .NET (without an external library like SharpZipLib)

Jon Galloway — Thu, 25 Oct 2007 11:08:05 GMT

Overview SharpZipLib provides best free .NET compression library, but what if you can't use it due to

re: .NET System.IO.Compression and zip files

Mohan — Thu, 28 Aug 2008 09:07:39 GMT

Hai

i have used it in my code but have a problem with it. my folder size before zipping is 599 kb and after zipping is 998 kb so what is the way to zip it in a way to decrease the file size

re: .NET System.IO.Compression and zip files

DotNetInterop — Tue, 02 Sep 2008 18:56:30 GMT

Mohan - What version of the Zip Library are you using? You will want to get the latest version of this library, from www.codeplex.com/DotNetZip. It corrects the problem where some files get "inflated" when they are zipped

re: .NET System.IO.Compression and zip files

john — Thu, 18 Dec 2008 18:41:46 GMT

the 4gig limit is probably due to the physical memory limitations of addressing space in the system.

IE the .net framework is not designed to touch the disk whilst it compresses

If you wanted to exceed this then you would have to write a pagefile like system to store processed data whilst using the 4 gig as a buffer

re: .NET System.IO.Compression and zip files

DotNetInterop — Tue, 23 Dec 2008 09:19:53 GMT

@john, The 4g limit mentioned above has nothing to do with the physical memory of the machine. It is related to the DeflateStream implementation. I haven't explored it well, so

I cannot say more than that.

it does not have to do with whether the implementation is streaming or not (viz, "not designed to touch the disk while compressing").

re: .NET System.IO.Compression and zip files

Jaime Olivares — Fri, 31 Jul 2009 05:51:57 GMT

I have just released a new version of ZipStorer with Deflate support at: zipstorer.codeplex.com