On-the-fly zipping using Ionic.Zip c#

Question

I am trying to create a zip file from a stream and in return a stream, my problem is I don't want to store any data in my local hard disk or in memory. I am using Ionic.Zip Library

        Stream output = new MemoryStream();
        using (ZipFile zip = new ZipFile())
        {
            Stream s = ftpManager.GetFileStream("/mydoc.docx");
            ZipEntry e = zip.AddEntry("Content-From-Stream.bin", s);
            e.Comment = "The content for entry in the zip file was obtained from a stream";
            //zip.AddFile("Readme.txt");
            zip.Save(output);
        }
        if (output != null)
        {
            ftpManager.Upload(output, "/MohamedTest/mydoc.zip");
        }

There are many problems in that code,

• First, I am using MemoryStream which is not preferable
• Second, zipped file is empty after compress

any suggestions

Answer 1

Most likely position on output is set to the end of stream after compression, please check this. And, unless you will implement some proxyfying stream (which will handle .Write method and send this data to FTP) you need memory/file stream to store the zipped data.