Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/Channels/BufferManager.cs

@@ -0,0 +1,112 @@
+//----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//----------------------------------------------------------------------------
+
+namespace System.ServiceModel.Channels
+{
+    using System;
+    using System.Runtime;
+    using System.ServiceModel;
+
+    public abstract class BufferManager
+    {
+        public abstract byte[] TakeBuffer(int bufferSize);
+        public abstract void ReturnBuffer(byte[] buffer);
+        public abstract void Clear();
+
+        public static BufferManager CreateBufferManager(long maxBufferPoolSize, int maxBufferSize)
+        {
+            if (maxBufferPoolSize < 0)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxBufferPoolSize",
+                    maxBufferPoolSize, SR.GetString(SR.ValueMustBeNonNegative)));
+            }
+
+            if (maxBufferSize < 0)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxBufferSize",
+                    maxBufferSize, SR.GetString(SR.ValueMustBeNonNegative)));
+            }
+
+            return new WrappingBufferManager(InternalBufferManager.Create(maxBufferPoolSize, maxBufferSize));
+        }
+
+        internal static InternalBufferManager GetInternalBufferManager(BufferManager bufferManager)
+        {
+            if (bufferManager is WrappingBufferManager)
+            {
+                return ((WrappingBufferManager)bufferManager).InternalBufferManager;
+            }
+            else
+            {
+                return new WrappingInternalBufferManager(bufferManager);
+            }
+        }
+
+        class WrappingBufferManager : BufferManager
+        {
+            InternalBufferManager innerBufferManager;
+
+            public WrappingBufferManager(InternalBufferManager innerBufferManager)
+            {
+                this.innerBufferManager = innerBufferManager;
+            }
+
+            public InternalBufferManager InternalBufferManager
+            {
+                get { return this.innerBufferManager; }
+            }
+
+            public override byte[] TakeBuffer(int bufferSize)
+            {
+                if (bufferSize < 0)
+                {
+                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("bufferSize", bufferSize,
+                        SR.GetString(SR.ValueMustBeNonNegative)));
+                }
+
+                return this.innerBufferManager.TakeBuffer(bufferSize);
+            }
+
+            public override void ReturnBuffer(byte[] buffer)
+            {
+                if (buffer == null)
+                {
+                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("buffer");
+                }
+
+                this.innerBufferManager.ReturnBuffer(buffer);
+            }
+
+            public override void Clear()
+            {
+                this.innerBufferManager.Clear();
+            }
+        }
+
+        class WrappingInternalBufferManager : InternalBufferManager
+        {
+            BufferManager innerBufferManager;
+
+            public WrappingInternalBufferManager(BufferManager innerBufferManager)
+            {
+                this.innerBufferManager = innerBufferManager;
+            }
+
+            public override void Clear()
+            {
+                this.innerBufferManager.Clear();
+            }
+
+            public override void ReturnBuffer(byte[] buffer)
+            {
+                this.innerBufferManager.ReturnBuffer(buffer);
+            }
+
+            public override byte[] TakeBuffer(int bufferSize)
+            {
+                return this.innerBufferManager.TakeBuffer(bufferSize);
+            }
+        }
+    }
+}