Yunan.WPF.ImageAnim.GifAnimation.ParseHeader C# (CSharp) Method

        private int ParseHeader(byte[] gifData, int offset)
        {
            string str = System.Text.ASCIIEncoding.ASCII.GetString(gifData, offset, 3);
            if (str != "GIF")
            {
                throw new Exception("Not a proper GIF file: missing GIF header");
            }
            return 6;
        }