Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

mcs/class/System/Mono.Btls/MonoBtlsObject.cs

@@ -0,0 +1,149 @@
+//
+// MonoBtlsObject.cs
+//
+// Author:
+//       Martin Baulig <martin.baulig@xamarin.com>
+//
+// Copyright (c) 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.
+#if SECURITY_DEP && MONO_FEATURE_BTLS
+using System;
+using System.Threading;
+using System.Runtime.InteropServices;
+using System.Runtime.CompilerServices;
+
+namespace Mono.Btls
+{
+	abstract class MonoBtlsObject : IDisposable
+	{
+#if MONO_FEATURE_DYNAMIC_BTLS
+		internal const string BTLS_DYLIB = "libmono-btls-shared";
+#else
+		internal const string BTLS_DYLIB = "__Internal";
+#endif
+
+		internal MonoBtlsObject (MonoBtlsHandle handle)
+		{
+			this.handle = handle;
+		}
+
+		protected internal abstract class MonoBtlsHandle : SafeHandle
+		{
+			internal MonoBtlsHandle ()
+				: base (IntPtr.Zero, true)
+			{
+			}
+
+			internal MonoBtlsHandle (IntPtr handle, bool ownsHandle)
+				: base (handle, ownsHandle)
+			{
+			}
+
+			public override bool IsInvalid {
+				get { return handle == IntPtr.Zero; }
+			}
+		}
+
+		internal MonoBtlsHandle Handle {
+			get {
+				CheckThrow ();
+				return handle;
+			}
+		}
+
+		public bool IsValid {
+			get { return handle != null && !handle.IsInvalid; }
+		}
+
+		MonoBtlsHandle handle;
+		Exception lastError;
+
+		protected void CheckThrow ()
+		{
+			if (lastError != null)
+				throw lastError;
+			if (handle == null || handle.IsInvalid)
+				throw new ObjectDisposedException ("MonoBtlsSsl");
+		}
+
+		protected Exception SetException (Exception ex)
+		{
+			if (lastError == null)
+				lastError = ex;
+			return ex;
+		}
+
+		protected void CheckError (bool ok, [CallerMemberName] string callerName = null)
+		{
+			if (!ok) {
+				if (callerName != null)
+					throw new MonoBtlsException ("{0}.{1} failed.", GetType ().Name, callerName);
+				else
+					throw new MonoBtlsException ();
+			}
+
+		}
+
+		protected void CheckError (int ret, [CallerMemberName] string callerName = null)
+		{
+			CheckError (ret == 1, callerName);
+		}
+
+		[DllImport (BTLS_DYLIB)]
+		extern static void mono_btls_free (IntPtr data);
+
+		protected void FreeDataPtr (IntPtr data)
+		{
+			mono_btls_free (data);
+		}
+
+		protected virtual void Close ()
+		{
+		}
+
+		protected void Dispose (bool disposing)
+		{
+			if (disposing) {
+				try {
+					if (handle != null) {
+						Close ();
+						handle.Dispose ();
+						handle = null;
+					}
+				} finally {
+					var disposedExc = new ObjectDisposedException (GetType ().Name);
+					Interlocked.CompareExchange (ref lastError, disposedExc, null);
+				}
+			}
+		}
+
+		public void Dispose ()
+		{
+			Dispose (true);
+			GC.SuppressFinalize (this);
+		}
+
+		~MonoBtlsObject ()
+		{
+			Dispose (false);
+		}
+	}
+}
+#endif