如何使用SharpZipLib提取任何档案？

Question

I'm using SharpZipLib to extract archives. I managed to extract .zip archives:

FastZip fastZip = new FastZip();

fastZip.ExtractZip(file, directory, null);

and to extract .tar.gz:

// Use a 4K buffer. Any larger is a waste.    
byte[] dataBuffer = new byte[4096];

using (Stream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))
{
    using (GZipInputStream gzipStream = new GZipInputStream(fileStream))
    {
        // Change this to your needs
        string fnOut = Path.Combine(directory, Path.GetFileNameWithoutExtension(file));

        using (FileStream fsOut = File.Create(fnOut))
        {
            StreamUtils.Copy(gzipStream, fsOut, dataBuffer);
        }
    }
}

Is there also a way to extract any kind of archive where I don't need to know the type of archive upfront? (eg SharpZipLib.ExtractAnyArchive(file, directory) )

Answer 1

SharpZipLib unfortunately is currently not able to auto-detect the format of an archive file/stream.

You either have to implement the functionality by yourself in some form, or seek an alternative library that is able to auto-detect the format of an archive. An example of such a library would be SharpCompress , however, as you already noted in the comments, different libraries can come with different kind of limitations and bugs that might affect the functionality of your software.

If you decide to roll your own auto-detection functionality for SharpZipLib , you can choose different approaches, like

• Try opening an (unknown) archive using the archive (reader/stream) classes for every archive format supported by SharpZipLib , until you find one which can open and process the archive file successfully.

• Implement some format detection routine that scans an archive file/stream for 'magic' signature bytes identifying a particular archive format. If the format of an archive file/stream has been thus identified, select and use the appropriate SharpZipLib classes for handling the detected archive format.