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    <p>There's a DeflateStream in <a href="http://dotnetzip.codeplex.com" rel="nofollow noreferrer">DotNetZip</a>, effectively a replacement of the built-in DeflateStream in the .NET BCL. Ionic.Zlib.DeflateStream has a tunable buffer size. I don't know if it will result in better memory efficiency in your scenario, but it may be worth a try. <a href="http://cheeso.members.winisp.net/DotNetZipHelp/html/433075df-7d0c-2869-3166-76ee1a2bcd17.htm" rel="nofollow noreferrer">Here's the doc</a>. </p> <p>I did not test decompression, but rather compression. In my tests I found limited returns on expanding the buffer size beyond 4k, for the subset of data I compressed. On the other hand, you still get accurate, correct compression, although it is less effective, even if the buffer is 1024 bytes. I suppose you would see similar results in decompression.</p> <p>In either case, the window size is not directly settable from the public interface. But, it is open source and you will be able to easily modify the default Wwindow size as appropriate. Also, if you think it's valuable, I could take a request to expose the window size as a settable param on the DeflateStream. I haven't exposed it because no one has asked for it. Yet?</p> <p>You said you had other compression, too. If you're doing Zlib or GZip, there's a ZlibStream and a GZipStream in the DotNetZip package, too. </p> <p>If you want to do Zip files, you need the full DotNetZip library (Ionic.Zip.dll, at ~400k). If you are just doing {Deflate, Zlib, GZip}Stream, then there is a Ionic.Zlib.dll, which is about 90k. </p> <p>DotNetZip is free, but <a href="http://cheeso.members.winisp.net/DotNetZipDonate.aspx" rel="nofollow noreferrer">donations are encouraged</a>. </p>
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    1. POCan I use less memory when using DeflateStream?
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    1. COSounds very interesting. I don't think exposing the window size is necessary or a good idea. The problem is that I have to allocate a lot *and* they are large. If I was going to attack this issue, I would solve it by allowing the stream to be reset to its initial state on a new substream.
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      1. USCraig Gidney
    2. COWindow size is exposed by zlib, the C ilbrary. So not unprecedented. But with the abstraction I've provided, I haven't exposed it as part of the DeflateStream. As for recycling buffers, you can definitely do that with the lower-level ZlibCodec class. Is is a Zlib encoder/decoder. DeflateStream is built on it. If you have buffers to decompress, as opposed to streams, the ZlibCodec may be the way to go.
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    3. COps: and if you used the ZlibCodec class, you would be able to set the window size, too.
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