1 files changed, 120 insertions, 0 deletions
diff --git a/dotnet/Qpid.Buffer/SimpleByteBuffer.cs b/dotnet/Qpid.Buffer/SimpleByteBuffer.cs
new file mode 100644
index 0000000000..956c59aa45
--- /dev/null
+++ b/dotnet/Qpid.Buffer/SimpleByteBuffer.cs
@@ -0,0 +1,120 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+using System;
+
+namespace Apache.Qpid.Buffer
+{
+   internal sealed class SimpleByteBuffer : ByteBuffer
+   {
+      private byte[] _buffer;
+
+      public override int Capacity
+      {
+         get { return _buffer.Length; }
+      }
+
+      public override byte[] Array
+      {
+         get { return _buffer; }
+      }
+
+      /// <summary>
+      /// Initialize a new instance with the desired size
+      /// </summary>
+      /// <param name="desiredSize">Initial Length of the array</param>
+      internal SimpleByteBuffer(int desiredSize)
+      {
+         _buffer = new byte[desiredSize];
+         Position = 0;
+         Limit = Capacity;
+      }
+
+      /// <summary>
+      /// Initialize a new instance with the data from
+      /// an underlying array
+      /// </summary>
+      /// <param name="buffer">Initial data</param>
+      /// <remarks>The original array is copied during construction and is not modified</remarks>
+      internal SimpleByteBuffer(byte[] buffer)
+      {
+         _buffer = (byte[])buffer.Clone();
+         // position at end
+         Position = Limit = Capacity;
+      }
+
+      protected override void DoWrite(int position, byte value)
+      {
+         // available space is already handled by base class
+         _buffer[position] = value;
+      }
+
+      protected override void DoWrite(int position, byte[] src, int offset, int length)
+      {
+         // available space is already handled by base class
+         for ( int i = 0; i < length; i++ )
+         {
+            _buffer[position+i] = src[offset+i];
+         }
+      }
+
+      protected override byte DoReadByte(int position)
+      {
+         return _buffer[position];
+      }
+
+      protected override void DoReadBytes(int position, byte[] dest, int offset, int length)
+      {
+         System.Array.Copy(_buffer, position, dest, offset, length);
+      }
+
+      protected override void DoCompact()
+      {
+         if ( Remaining > 0 )
+         {
+            if ( Position > 0 )
+            {
+               System.Array.Copy(_buffer, Position, _buffer, 0, Remaining);
+            }
+            Position = Remaining;
+         } else
+         {
+            Position = 0;
+         }
+         Limit = Capacity;
+      }
+
+      protected override void DoResize(int newSize)
+      {
+         if ( newSize < Capacity )
+            throw new NotSupportedException("Cannot resize a buffer to make it smaller");
+
+         int newCapacity = 1;
+         while ( newCapacity < newSize )
+         {
+            newCapacity <<= 1;
+         }
+
+         byte[] newBuffer = new byte[newCapacity];
+         System.Array.Copy(_buffer, newBuffer, _buffer.Length);
+         _buffer = newBuffer;
+      }
+   } // class SimpleByteBuffer
+}