Carrotware.Web.UI.Controls.CarrotHttpHandler.DoThumb C# (CSharp) Метод

        private void DoThumb(HttpContext context)
        {
            int iThumb = 150;
            string sImageIn = context.Request.QueryString["thumb"];
            string sImg = sImageIn;

            if (sImageIn.Contains("../") || sImageIn.Contains(@"..\")) {
                throw new Exception("Cannot use relative paths.");
            }
            if (sImageIn.Contains(":")) {
                throw new Exception("Cannot specify drive letters.");
            }
            if (sImageIn.Contains("//") || sImageIn.Contains(@"\\")) {
                throw new Exception("Cannot use UNC paths.");
            }

            string sScale = "false";
            if (context.Request.QueryString["scale"] != null) {
                sScale = context.Request.QueryString["scale"].ToLowerInvariant();
            }

            if (context.Request.QueryString["square"] != null) {
                string sImgPX = context.Request.QueryString["square"];
                if (!string.IsNullOrEmpty(sImgPX)) {
                    try {
                        iThumb = int.Parse(sImgPX);
                    } catch { }
                    if (iThumb < 10 || iThumb > 500) {
                        iThumb = 100;
                    }
                }
            }

            Bitmap bmpIn = new Bitmap(25, 25);
            Bitmap bmpThumb = new Bitmap(iThumb, iThumb);

            int iHeight = iThumb;
            int iWidth = iThumb;

            if (!string.IsNullOrEmpty(sImageIn)) {
                sImg = context.Server.MapPath(sImageIn);
                if (File.Exists(sImg)) {
                    bmpIn = new Bitmap(sImg);

                    if (sScale == "true") {
                        int h = bmpIn.Height;
                        int w = bmpIn.Width;

                        if (iHeight > 0) {
                            iWidth = (int)(((float)w / (float)h) * (float)iHeight);
                        } else {
                            iHeight = h;
                            iWidth = w;
                        }
                    }

                    bmpThumb = ResizeBitmap(bmpIn, iWidth, iHeight);
                } else {
                    using (Graphics graphics = Graphics.FromImage(bmpThumb)) {
                        Rectangle rect = new Rectangle(0, 0, bmpThumb.Width, bmpThumb.Height);
                        using (HatchBrush hatch = new HatchBrush(HatchStyle.Weave, Color.BurlyWood, Color.AntiqueWhite)) {
                            graphics.FillRectangle(hatch, rect);
                            int topPadding = 2; // top and bottom padding in pixels
                            int sidePadding = 2; // side padding in pixels
                            Font font = new Font(FontFamily.GenericSerif, 10, FontStyle.Bold);
                            SolidBrush textBrush = new SolidBrush(Color.Black);

                            if (sImageIn.Contains("/")) {
                                sImageIn = sImageIn.Substring(sImageIn.LastIndexOf("/") + 1);
                            }

                            sImageIn = "404 \r\n" + sImageIn;

                            graphics.DrawString(sImageIn, font, textBrush, sidePadding, topPadding);

                            using (MemoryStream memStream = new MemoryStream()) {
                                bmpThumb.Save(memStream, ImageFormat.Png);
                            }

                            textBrush.Dispose();
                            font.Dispose();
                        }
                    }
                }
            }

            if (bmpThumb == null) {
                context.Response.StatusCode = 404;
                context.Response.StatusDescription = "Not Found";
                context.ApplicationInstance.CompleteRequest();
                return;
            }

            context.Response.Expires = 5;
            context.Response.ContentType = "image/x-png";

            using (MemoryStream memStream = new MemoryStream()) {
                bmpThumb.Save(memStream, ImageFormat.Png);
                memStream.WriteTo(context.Response.OutputStream);
            }

            context.Response.StatusCode = 200;
            context.Response.StatusDescription = "OK";
            context.ApplicationInstance.CompleteRequest();

            bmpThumb.Dispose();
            bmpIn.Dispose();

            context.Response.End();
        }