.NET 中的好的 zlib 实现？

Question

I'm building an network application that needs to be able to switch from normal network traffic to a zlib compressed stream, mid stream. My thoughts on the matter involve boolean switch that when on will cause the network code to pass all the data through a class that I can feed IEnumerable<byte> into, and then pull out the decompressed stream, passing that on to the already existing protocol parsing code.

Things I've looked at:

• ZLib.NET - It seems a little... Ecclectic, and not quite what I want. Would still make a decent start to build off though. ( Jon Skeet's comments here hardly inspire me either.)
• SharpZipLib - This doesn't seem to support zlib at all? Can anyone confirm or deny this?

I would very much prefer and all managed solution, but let's have at it... are there any other implementations of this library out there in .NET, that might be better suited to what I want to do, or should I take ZLib.NET and build off that as a start?

PS:

Jon's asked for more detail, so here it is.

I'm trying to implement MCCP 2 . This involves a signal being sent in the network stream, and everything after this signal is a zlib compressed data stream. There's links to exactly what they mean by that in the above link. Anyway, to be clear, I'm on the recieving end of this (client, not server), and I have a bunch of data read out of the network stream already, and the toggle will be in the middle of this (in all likelyhood atleast), so any solution needs to be able to have some extra data fed into it, before it takes over the NetworkStream (or I manually feed in the rest of the data).

Answer 1

SharpZipLib does support ZLib. Look in the FAQ .

Additionally, have you checked whether the System.IO.Compression namespace supports what you need?

I wouldn't use an IEnumerable<byte> though - streams are designed to be chained together.

EDIT: Okay... it sounds like you need a stream which supports buffering, but with more control than BufferedStream provides. You'd need to "rewind" the stream if you saw the decompression toggle, and then create a GZipStream on top of it. Your buffer would need to be at least as big as your biggest call to Read() so that you could always have enough buffer to rewind.

Answer 2

Included in DotNetZip there is a ZlibStream , for compressing or decompressing zlib streams of data. You didn't ask, but there is also a GZipStream and a DeflateStream. As well as a ZlibCodec class, if that is your thing. (just inflates or deflates buffers, as opposed to streams).

DotNetZip is a fully-managed library with a liberal license. You don't need to use any of the .zip capability to get at the Zlib stuff. And the zlib stuff is packaged as a separate (smaller) DLL just for this purpose.

Answer 3

I can recommend you Gerry Shaw's zlib wrapper for .NET:

http://www.organicbit.com/zip/

Answer 4

As far as I know the ZLib (gzip) library doesn't support listing the files in the header. Assuming that matters to you, but it seems a big shortcoming. This was when I used the sharp zip library a while ago, so I'm willing to delete this :)

Answer 5

Old question, but System.IO.Compression.DeflateStream is actually the right answer if you need proper zlib support:

Starting with the .NET Framework 4.5, the DeflateStream class uses the zlib library . As a result, it provides a better compression algorithm and, in most cases, a smaller compressed file than it provides in earlier versions of the .NET Framework.

Doesn't get better than that.