Feb 8

Written by: Oleg Zhukov
2/8/2010 10:10 PM

The other day I needed to unzip a bunch of zip-archives, modify the unzipped content and zip them back again. Since I'm lazy (as every developer should be) I decided to write a tool that would do all the work for me.

After googling around I found several ways of handling zip archives. First of them I tried was the System.IO.Packaging namespace classes available in .NET 3.0. But disappointment came soon when it simply failed to unzip my archives probably due to some zip format incompatibility.

Well-known #ziplib turned out to be under GPL, and I also heard it's less usable than its main competitor DotNetZip.

With DotNetZip i did my job in several minutes:

private void ProcessMMCSECOfile(string mmcsecoFileName)
{
    using (ZipFile mmcseco = ZipFile.Read(mmcsecoFileName))
    {
        mmcseco.CompressionLevel = CompressionLevel.None;
        string newCodeModelContents = ChangeEncoding(
                GetContents(mmcseco, "codemodel.xml"));
        string newDiagramsContents = ChangeEncoding(
                GetContents(mmcseco, "diagrams.xml"));
        mmcseco.RemoveEntry("diagrams.xml");
        mmcseco.RemoveEntry("codemodel.xml");
        mmcseco.AddEntry("diagrams.xml", newDiagramsContents);
        mmcseco.AddEntry("codemodel.xml", newCodeModelContents);
        mmcseco.Save();
    }
    processedFilesCount++;
}

string GetContents(ZipFile zipFile, string archivedFileName)
{
    using (Stream st = zipFile[archivedFileName].OpenReader())
    {
        using (StreamReader reader = new StreamReader(st,
            Encoding.GetEncoding(correctEncodingTxtBox.Text)))
        {
            return reader.ReadToEnd();
        }
    }
}

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