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    <p>I found problems with Microsoft's GZipStream implementation not being able to read certain gzip files, so I have been testing a few libraries.</p> <p>This is a basic test I adapted for you to run, tweak, and decide:</p> <pre><code>using System; using System.Diagnostics; using System.IO; using System.IO.Compression; using NUnit.Framework; using Ionic.Zlib; using ICSharpCode.SharpZipLib.GZip; namespace ZipTests { [TestFixture] public class ZipTests { MemoryStream input, compressed, decompressed; Stream compressor; int inputSize; Stopwatch timer; public ZipTests() { string testFile = "TestFile.pdf"; using(var file = File.OpenRead(testFile)) { inputSize = (int)file.Length; Console.WriteLine("Reading " + inputSize + " from " + testFile); var ms = new MemoryStream(inputSize); file.Read(ms.GetBuffer(), 0, inputSize); ms.Position = 0; input = ms; } compressed = new MemoryStream(); } void StartCompression() { Console.WriteLine("Using " + compressor.GetType() + ":"); GC.Collect(2, GCCollectionMode.Forced); // Start fresh timer = Stopwatch.StartNew(); } public void EndCompression() { timer.Stop(); Console.WriteLine(" took " + timer.Elapsed + " to compress " + inputSize.ToString("#,0") + " bytes into " + compressed.Length.ToString("#,0")); decompressed = new MemoryStream(inputSize); compressed.Position = 0; // Rewind! timer.Restart(); } public void AfterDecompression() { timer.Stop(); Console.WriteLine(" then " + timer.Elapsed + " to decompress."); Assert.AreEqual(inputSize, decompressed.Length); Assert.AreEqual(input.GetBuffer(), decompressed.GetBuffer()); input.Dispose(); compressed.Dispose(); decompressed.Dispose(); } [Test] public void TestGZipStream() { compressor = new System.IO.Compression.GZipStream(compressed, System.IO.Compression.CompressionMode.Compress, true); StartCompression(); compressor.Write(input.GetBuffer(), 0, inputSize); compressor.Close(); EndCompression(); var decompressor = new System.IO.Compression.GZipStream(compressed, System.IO.Compression.CompressionMode.Decompress, true); decompressor.CopyTo(decompressed); AfterDecompression(); } [Test] public void TestDotNetZip() { compressor = new Ionic.Zlib.GZipStream(compressed, Ionic.Zlib.CompressionMode.Compress, true); StartCompression(); compressor.Write(input.GetBuffer(), 0, inputSize); compressor.Close(); EndCompression(); var decompressor = new Ionic.Zlib.GZipStream(compressed, Ionic.Zlib.CompressionMode.Decompress, true); decompressor.CopyTo(decompressed); AfterDecompression(); } [Test] public void TestSharpZlib() { compressor = new ICSharpCode.SharpZipLib.GZip.GZipOutputStream(compressed) { IsStreamOwner = false }; StartCompression(); compressor.Write(input.GetBuffer(), 0, inputSize); compressor.Close(); EndCompression(); var decompressor = new ICSharpCode.SharpZipLib.GZip.GZipInputStream(compressed); decompressor.CopyTo(decompressed); AfterDecompression(); } static void Main() { Console.WriteLine("Running CLR version " + Environment.Version + " on " + Environment.OSVersion); Assert.AreEqual(1,1); // Preload NUnit new ZipTests().TestGZipStream(); new ZipTests().TestDotNetZip(); new ZipTests().TestSharpZlib(); } } } </code></pre> <p>And the result <em>in the system I am currently running</em> (Mono on Linux), is as follows:</p> <pre><code>Running Mono CLR version 4.0.30319.1 on Unix 3.2.0.29 Reading 37711561 from /home/agustin/Incoming/ZipTests/TestFile.pdf Using System.IO.Compression.GZipStream: took 00:00:03.3058572 to compress 37,711,561 bytes into 33,438,894 then 00:00:00.5331546 to decompress. Reading 37711561 from /home/agustin/Incoming/ZipTests/TestFile.pdf Using Ionic.Zlib.GZipStream: took 00:00:08.9531478 to compress 37,711,561 bytes into 33,437,891 then 00:00:01.8047543 to decompress. Reading 37711561 from /home/agustin/Incoming/ZipTests/TestFile.pdf Using ICSharpCode.SharpZipLib.GZip.GZipOutputStream: took 00:00:07.4982231 to compress 37,711,561 bytes into 33,431,962 then 00:00:02.4157496 to decompress. </code></pre> <p>Be warned that this is Mono's GZIP, and Microsoft's version will give its own results (and as I mentioned, just can't handle any gzip you give it)</p> <p>This is what I got on a windows system:</p> <pre><code>Running CLR version 4.0.30319.1 on Microsoft Windows NT 5.1.2600 Service Pack 3 Reading 37711561 from TestFile.pdf Using System.IO.Compression.GZipStream: took 00:00:03.3557061 to compress 37.711.561 bytes into 36.228.969 then 00:00:00.7079438 to decompress. Reading 37711561 from TestFile.pdf Using Ionic.Zlib.GZipStream: took 00:00:23.4180958 to compress 37.711.561 bytes into 33.437.891 then 00:00:03.5955664 to decompress. Reading 37711561 from TestFile.pdf Using ICSharpCode.SharpZipLib.GZip.GZipOutputStream: took 00:00:09.9157130 to compress 37.711.561 bytes into 33.431.962 then 00:00:03.0983499 to decompress. </code></pre> <p>It is easy enough to add more tests...</p>
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    1. COcan you try sevenzipsharp http://sevenzipsharp.codeplex.com/
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