Decompress ZIP Stream

Question

For some reason I cannot find any examples for doing so with DotNetZip.

I receive a Gziped content from my WebAPI.

All I want to do is to read that memory stream from the response and unzip the content(text) into a string.

My compression working fine, I just can't figure out the decompress:

public static byte[] CompressData(byte[] str)
{
    using (var output = new MemoryStream())
    {
        using (
            var compressor = new Ionic.Zlib.DeflateStream(
            output, Ionic.Zlib.CompressionMode.Compress,
            Ionic.Zlib.CompressionLevel.BestSpeed))
        {
            compressor.Write(str, 0, str.Length);
        }

        return output.ToArray();
    }
}

https://stackoverflow.com/questions/3469153/c-sharp-gzipstream-to-string this answer might help you :) — Georges Khater, Apr 01 '19 at 08:43
What's wrong with saving the zip file in a tmp directory and then decompressing it afterwards ? — Fourat, Apr 01 '19 at 08:44

score -1 · Answer 1 · answered Apr 01 '19 at 08:46

The following code shows how the program extracts the files from the archive.

private void ExtractArchive(object sender, EventArgs e)
{
    try
    {
        using (ZipFile zip = ZipFile.Read(txtArchiveName.zip))
        {
            // Loop through the archive's files.
            foreach (ZipEntry zip_entry in zip)
            {
                zip_entry.Extract(txtExtractTo);
            }
        }

        MessageBox.Show("Done");
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error extracting archive.\n" +
            ex.Message);
    }
}

The simplest way to Extract all the entries from a zipfile looks like this:

using (ZipFile zip = ZipFile.Read(NameOfExistingZipFile))
  {
    zip.ExtractAll(args[1]);
  }

score -1 · Answer 2 · answered Apr 01 '19 at 09:03

Ok, I found the solution. Pretty simple actually, but very poorly documented online.

 public static byte[] Decompress(Stream ms)
{
    byte[] outData = null;
    using (MemoryStream msInner = new MemoryStream())
    {
        using (DeflateStream defStream = new DeflateStream(ms, CompressionMode.Decompress))
        {
            defStream.CopyTo(msInner);
            outData = msInner.ToArray();
        }
    }

    return outData;
}

Decompress ZIP Stream

2 Answers2