[ { "Id": "260296", "ThreadId": "76110", "Html": "

Executing the code below gives me a

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 NotSupportedException: Specified Method is not supported.

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Stacktrace:

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   at System.Web.HttpResponseStream.get_Position()\r\n   at Ionic.Zip.ZipEntry.WriteHeader(Stream s, Int32 cycle)\r\n   at Ionic.Zip.ZipOutputStream._InitiateCurrentEntry(Boolean finishing)\r\n   at Ionic.Zip.ZipOutputStream.Write(Byte[] buffer, Int32 offset, Int32 count)\r\n   at PageTest.streamZipToClient2(HttpResponse response, String zipFileName, String zipFileBaseDirectory, String physicalBasePath, IEnumerable`1 physicalFilePaths) in c:\\Entwicklung\\Projekte\\PoolarServer\\ClientName\\trunk\\PageTest.aspx.cs:line 74
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I need to do it this way because I check for Response.IsClientConnected while streaming in the data (some file are >1GB).
A compromise would be to just check after each entry addition, but I couldn't find a way to do that either (ZipOutputStream has no Write(Stream stream). And a ZipFile would not begin streaming before calling save.

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Any tips here?

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Many thanks!

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Code:

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    protected void Page_Load(object sender, EventArgs e)\r\n    {\r\n        var fileInfos = new List<string> { \r\n        @"C:\\Temp\\sub1\\file1.pdf", @"C:\\Temp\\sub1\\file2.gz", @"C:\\Temp\\sub1\\file3.bak"\r\n        };\r\n        streamZipToClient2(Response, "test.zip", "myzip", @"C:\\Temp\\", fileInfos);\r\n\r\n        HttpContext.Current.ApplicationInstance.CompleteRequest();\r\n    }\r\n\r\n\r\n    static bool streamZipToClient2(HttpResponse response, string zipFileName, string zipFileBaseDirectory, string physicalBasePath, IEnumerable<string> physicalFilePaths)\r\n    {\r\n        response.Clear();\r\n        response.Buffer = false;\r\n\r\n        long approximateZipFileSize = 0;\r\n\r\n        foreach (var filePath in physicalFilePaths)\r\n        {\r\n            approximateZipFileSize += (new FileInfo(filePath)).Length;\r\n        }\r\n\r\n        response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);\r\n        response.Cache.SetNoStore();\r\n        response.Cache.SetExpires(DateTime.UtcNow.AddYears(-1));\r\n\r\n        response.ContentType = "application/zip";\r\n        response.AddHeader("content-disposition", "filename=" + zipFileName);\r\n        response.AddHeader("content-length", (approximateZipFileSize * 1.2).ToString());\r\n\r\n        using (var zipStream = new Ionic.Zip.ZipOutputStream(response.OutputStream))\r\n        {\r\n                zipStream.CompressionLevel = Ionic.Zlib.CompressionLevel.None;\r\n                int bufferSize = 1024 * 1024;\r\n                var buffer = new byte[bufferSize];\r\n                foreach (var physicalFilePath in physicalFilePaths)\r\n                {\r\n                    using (var fileStream = File.OpenRead(physicalFilePath))\r\n                    {\r\n                        string relativeFilePath = physicalFilePath.Replace(physicalBasePath, "");\r\n                        string fileName = Path.GetFileName(physicalFilePath);\r\n                        string directoryInZipFile = Path.Combine(zipFileBaseDirectory, relativeFilePath.Replace(fileName, ""));\r\n                        string entryName = Path.Combine(directoryInZipFile, fileName);\r\n\r\n                        zipStream.PutNextEntry(entryName);\r\n\r\n                        long remaining = fileStream.Length;\r\n                        while (remaining > 0)\r\n                        {\r\n                            if (!response.IsClientConnected)\r\n                            {\r\n                                return false;\r\n                            }\r\n                            int read = fileStream.Read(buffer, 0, bufferSize);\r\n                            remaining -= read;\r\n\r\n                            zipStream.Write(buffer, 0, read);                           \r\n                        }\r\n                    }\r\n                }\r\n        }\r\n        return true;\r\n    }\r\n
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", "PostedDate": "2009-11-24T10:43:16.927-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "260331", "ThreadId": "76110", "Html": "

looks like a bug to me. . .

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I'll need to look closer, and get back to you.

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", "PostedDate": "2009-11-24T12:04:13.543-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "260419", "ThreadId": "76110", "Html": "

That would be very nice, thank you.

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As soon as I've integrated the zipping code into the rest of the application, there will be some testing of the streamed archives on Mac computers. I will feed back the results (as there still seems to be some uncertainty about that issue)

", "PostedDate": "2009-11-24T15:44:25.687-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "260682", "ThreadId": "76110", "Html": "This discussion has been copied to a work item. Click here to go to the work item and continue the discussion.", "PostedDate": "2009-11-25T10:23:29.613-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "263907", "ThreadId": "76110", "Html": "

ps: I think you should use Response.Close() instead of

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HttpContext.Current.ApplicationInstance.CompleteRequest();

", "PostedDate": "2009-12-05T05:01:09.363-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "268828", "ThreadId": "76110", "Html": "

I needed to do exactly the same as above and got the same exception.

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I encounter it with Response buffer set to false. The internal stream usage needs to know it stream position, but there is no code for wrapping the write-only stream in a CountingStream.

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So, I've fixed the bug by changing _Init() in Ionic.Zip.ZipOutputStream as follows:

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        private void _Init(Stream stream, bool leaveOpen)\r\n        {\r\n            _outputStream = stream.CanRead ? stream : new CountingStream(stream);
            CompressionLevel = Ionic.Zlib.CompressionLevel.Default;\r\n            _encryption = EncryptionAlgorithm.None;\r\n            _entriesWritten = new List<ZipEntry>();\r\n            _zip64 = Zip64Option.Never;\r\n            _leaveUnderlyingStreamOpen = leaveOpen;\r\n            Strategy = Ionic.Zlib.CompressionStrategy.Default;\r\n            _name = "unknown";\r\n#if !NETCF    \r\n            ParallelDeflateThreshold = -1L;\r\n#endif\r\n        }\r\n
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\r\nI hope this helps someone else, and that this fix (or possibly a "better" solution makes it into the official release as soon as possible (so I don't have to keep a separate branch myself...) :)
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", "PostedDate": "2009-12-18T01:21:44.137-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "268961", "ThreadId": "76110", "Html": "

Aquamoth, thanks, that's helpful. 

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The fix will be in vv1.9.0.33.

", "PostedDate": "2009-12-18T08:34:05.37-08:00", "UserRole": null, "MarkedAsAnswerDate": null } ]