Using SharpZipLib to extract zip files from Unity in a coroutine-friendly way

ExtractZipFile.cs

// This sample function uses SharpZipLib (http://icsharpcode.github.io/SharpZipLib/) to extract 
// a zip file without blocking Unity's main thread. Remember to call it with StartCoroutine().
// Byte data is passed so a MemoryStream object is created inside the function to prevent it 
// from being reclaimed by the garbage collector.

public IEnumerator ExtractZipFile(byte[] zipFileData, string targetDirectory, int bufferSize = 256 * 1024)
{
    Directory.CreateDirectory(targetDirectory);

    using (MemoryStream fileStream = new MemoryStream())
    {
        fileStream.Write(zipFileData, 0, zipFileData.Length);
        fileStream.Flush();
        fileStream.Seek(0, SeekOrigin.Begin);

        ZipFile zipFile = new ZipFile(fileStream);

        foreach (ZipEntry entry in zipFile)
        {
            string targetFile = Path.Combine(targetDirectory, entry.Name);

            using (FileStream outputFile = File.Create(targetFile))
            {
                if (entry.Size > 0)
                {
                    Stream zippedStream = zipFile.GetInputStream(entry);
                    byte[] dataBuffer = new byte[bufferSize];

                    int readBytes;
                    while ((readBytes = zippedStream.Read(dataBuffer, 0, bufferSize)) > 0)
                    {
                        outputFile.Write(dataBuffer, 0, readBytes);
                        outputFile.Flush();
                        yield return null;
                    }
                }
            }
        }
    }
}