Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Web.Mvc3/Mvc/FileStreamResult.cs

@@ -0,0 +1,44 @@
+namespace System.Web.Mvc {
+    using System;
+    using System.IO;
+    using System.Web;
+
+    public class FileStreamResult : FileResult {
+
+        // default buffer size as defined in BufferedStream type
+        private const int _bufferSize = 0x1000;
+
+        public FileStreamResult(Stream fileStream, string contentType)
+            : base(contentType) {
+            if (fileStream == null) {
+                throw new ArgumentNullException("fileStream");
+            }
+
+            FileStream = fileStream;
+        }
+
+        public Stream FileStream {
+            get;
+            private set;
+        }
+
+        protected override void WriteFile(HttpResponseBase response) {
+            // grab chunks of data and write to the output stream
+            Stream outputStream = response.OutputStream;
+            using (FileStream) {
+                byte[] buffer = new byte[_bufferSize];
+
+                while (true) {
+                    int bytesRead = FileStream.Read(buffer, 0, _bufferSize);
+                    if (bytesRead == 0) {
+                        // no more data
+                        break;
+                    }
+
+                    outputStream.Write(buffer, 0, bytesRead);
+                }
+            }
+        }
+
+    }
+}