1 files changed, 119 insertions, 0 deletions
diff --git a/mcs/class/Mono.Security/Mono.Security.Interface/TlsMultiBuffer.cs b/mcs/class/Mono.Security/Mono.Security.Interface/TlsMultiBuffer.cs
new file mode 100644
index 00000000000..de2975a81db
--- /dev/null
+++ b/mcs/class/Mono.Security/Mono.Security.Interface/TlsMultiBuffer.cs
@@ -0,0 +1,119 @@
+//
+// TlsMultiBuffer.cs
+//
+// Author:
+//       Martin Baulig <martin.baulig@xamarin.com>
+//
+// Copyright (c) 2014-2016 Xamarin Inc. (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Mono.Security.Interface
+{
+	public class TlsMultiBuffer
+	{
+		MemoryChunk first, last;
+
+		private class MemoryChunk : BufferOffsetSize
+		{
+			public MemoryChunk next;
+
+			public MemoryChunk (byte[] buffer, int offset, int size)
+				: base (buffer, offset, size)
+			{
+			}
+		}
+
+		public bool IsEmpty {
+			get { return first == null; }
+		}
+
+		public bool IsSingle {
+			get { return first != null && first.next == null; }
+		}
+
+		public void Add (TlsBuffer buffer)
+		{
+			Add (buffer.Buffer, buffer.Offset, buffer.Size);
+		}
+
+		public void Add (byte[] buffer)
+		{
+			Add (buffer, 0, buffer.Length);
+		}
+
+		public void Add (byte[] buffer, int offset, int size)
+		{
+			var chunk = new MemoryChunk (buffer, offset, size);
+			if (last == null)
+				first = last = chunk;
+			else {
+				last.next = chunk;
+				last = chunk;
+			}
+		}
+
+		public BufferOffsetSize[] GetBufferArray ()
+		{
+			int count = 0;
+			for (var ptr = first; ptr != null; ptr = ptr.next)
+				count++;
+			var array = new BufferOffsetSize [count];
+			count = 0;
+			for (var ptr = first; ptr != null; ptr = ptr.next)
+				array [count++] = ptr;
+			return array;
+		}
+
+		public void Clear ()
+		{
+			for (var ptr = first; ptr != null; ptr = ptr.next)
+				ptr.Dispose ();
+			first = last = null;
+		}
+
+		public BufferOffsetSize GetBuffer ()
+		{
+			int totalSize = 0;
+			for (var ptr = first; ptr != null; ptr = ptr.next)
+				totalSize += ptr.Size;
+
+			var outBuffer = new BufferOffsetSize (new byte [totalSize]);
+			int offset = 0;
+			for (var ptr = first; ptr != null; ptr = ptr.next) {
+				Buffer.BlockCopy (ptr.Buffer, ptr.Offset, outBuffer.Buffer, offset, ptr.Size);
+				offset += ptr.Size;
+			}
+			return outBuffer;
+		}
+
+		public BufferOffsetSize StealBuffer ()
+		{
+			if (IsSingle) {
+				var retval = first;
+				first = last = null;
+				return retval;
+			}
+
+			return GetBuffer ();
+		}
+	}
+}
+