Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

mcs/class/Mono.Security/Mono.Security.Interface/BufferOffsetSize.cs

@@ -0,0 +1,96 @@
+//
+// BufferOffsetSize.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 BufferOffsetSize : SecretParameters, IBufferOffsetSize
+	{
+		public byte[] Buffer {
+			get;
+			private set;
+		}
+
+		public int Offset {
+			get;
+			internal set;
+		}
+
+		public int Size {
+			get { return EndOffset - Offset; }
+		}
+
+		public int EndOffset {
+			get;
+			internal set;
+		}
+
+		public BufferOffsetSize (byte[] buffer, int offset, int size)
+		{
+			Buffer = buffer;
+			Offset = offset;
+			EndOffset = offset + size;
+		}
+
+		public BufferOffsetSize (byte[] buffer)
+			: this (buffer, 0, buffer.Length)
+		{
+		}
+
+		public BufferOffsetSize (int size)
+			: this (new byte [size])
+		{
+		}
+
+		public byte[] GetBuffer ()
+		{
+			var copy = new byte [Size];
+			Array.Copy (Buffer, Offset, copy, 0, Size);
+			return copy;
+		}
+
+		public void TruncateTo (int newSize)
+		{
+			if (newSize > Size)
+				throw new ArgumentException ("newSize");
+			EndOffset = Offset + newSize;
+		}
+
+		protected void SetBuffer (byte[] buffer, int offset, int size)
+		{
+			Buffer = buffer;
+			Offset = offset;
+			EndOffset = offset + size;
+		}
+
+		protected override void Clear ()
+		{
+			Buffer = null;
+			Offset = EndOffset = 0;
+		}
+	}
+}
+