DeflateStream 4GB Limit in .NET

Question

From MSDN: DeflateStream Class

DeflateStream cannot be used to compress files larger than 4 GB.

Are there any other implementations for .NET without a 4 GB limit?

NOTE. I really need to unzip a GZ file with content larger than 4 GB. Can any code do this?

Answer 1

Take a look at SharpZipLib . Not sure if he is subject to the same limitations, but worth a look.

Answer 2

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

Answer 3

There is sample code in CodeProject using the 7-Zip library.

The license is open, so you can use it in your project.

7-Zip also supports GZ files.

Answer 4

Looking back, it seems that many people are faced with this problem. Details of System.IO.Compressio.DeflateStream, please , are the most comprehensive.

The only implementation I could find that seems to overcome this problem with Zip64 is Xceed Zip for .NET .

However, it is very expensive, and I'm not sure if it will satisfy your needs.

Edit:

It seems that there are many Zip64 implementations for .NET, but I can not find any free ones.

Answer 5

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

Answer 6

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

Answer 7

Although this documentation specifies a 4 GB limit for both DeflateStream and GZipStream, only GZipStream is limited due to the CRC32 checksum. If you do not need CRC32, use DeflateStream.