Add IMessageCapturer implementations

Hcs.Client/Client/MessageCapturer/MemoryMessageCapturer.cs

@@ -0,0 +1,47 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace Hcs.Client.MessageCapturer
+{
+    public class MemoryMessageCapturer : IMessageCapturer
+    {
+        private readonly MemoryStream messageCaptureStream;
+        private readonly StreamWriter messageCaptureWriter;
+
+        public MemoryMessageCapturer()
+        {
+            messageCaptureStream = new MemoryStream();
+            messageCaptureWriter = new StreamWriter(messageCaptureStream, Encoding.UTF8);
+        }
+
+        public void CaptureMessage(bool sent, string messageBody)
+        {
+            if (messageCaptureStream.Position > 0)
+            {
+                messageCaptureWriter.WriteLine("");
+            }
+
+            messageCaptureWriter.Write("<!--");
+            messageCaptureWriter.Write(sent ? "SENT " : "RECEIVED ");
+            messageCaptureWriter.Write(DateTime.Now.ToString());
+            messageCaptureWriter.WriteLine("-->");
+            messageCaptureWriter.Write(messageBody);
+            messageCaptureWriter.Flush();
+        }
+
+        public byte[] GetData()
+        {
+            var buf = messageCaptureStream.GetBuffer();
+            var size = (int)messageCaptureStream.Length;
+            var data = new byte[size];
+            Buffer.BlockCopy(buf, 0, data, 0, size);
+            return data;
+        }
+
+        public override string ToString()
+        {
+            return Encoding.UTF8.GetString(GetData());
+        }
+    }
+}