.net DeflateStream 4Gb Limit

Question

From msdn:

http://msdn.microsoft.com/en-us/library/system.io.compression.deflatestream.aspx

This class cannot be used to compress files larger than 4 GB.

Do you know any other implementations for .net without the 4 gb limit?

Thanks

NOTE: I really need to decompress a file in GZ format with content larger than 4gb. Do you know any code that can do that? Thanks

Answer 1

Having a look around seems a lot of people have encountered this problem. This thread seems the most comprehensive

System.IO.Compressio.DeflateStream clarifications please

the only implementation I was able to find that seems to overcome this problem by using Zip64 is

Xceed Zip for .NET

however it is very expensive and not sure if it would suite your needs.

Edit:

There does seem to be quite a number of implementations of Zip64 for .NET but can't find any that are free.

Answer 2

There is sample code at CodeProject using the 7zip library.

The license is open so you should be able to use this in your project.

7-Zip also supports GZ files.

Answer 3

Take a look at SharpZipLib. Not sure if it's subject to the same limitation, but worth a look.

Answer 4

Look for libraries that support DEFLATE64 (not Zip64, that's an extension to the ZIP file format). Xceed Zip for .NET does support Deflate64, and I'm sure others do too.

Answer 5

FYI, we have removed the 4 GB limit from DeflateStream in .NET 4.

Answer 6

DotNetZip does ZIP64 for .NET, and it is free. But Zip64 is not the same as Deflate64.

Answer 7

Although that documentation says the 4GB limitation is for both the DeflateStream and GZipStream, only GZipStream is limited because of the CRC32 checksum. If you do not need CRC32 then use DeflateStream.