Initial commit of .NET port of FlatBuffers

Include C# codegen in flatc and .NET FlatBuffer access via the
FlatBufferBuilder class

Tested: on Windows.

Change-Id: If5228a8df60a10e0751b245c6c64530264ea2d8a

net/FlatBuffers/ByteBuffer.cs

@@ -0,0 +1,142 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Licensed 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;
+using System.Linq;
+
+namespace FlatBuffers
+{
+    /// <summary>
+    /// Class to mimick Java's ByteBuffer which is used heavily in Flatbuffers
+    /// </summary>
+    public class ByteBuffer
+    {
+        private readonly byte[] _buffer;
+
+        public int Length { get { return _buffer.Length; } }
+
+        public byte[] Data { get { return _buffer; } }
+
+        public ByteBuffer(byte[] buffer)
+        {
+            _buffer = buffer;
+        }
+
+        protected void WriteLittleEndian(int offset, byte[] data)
+        {
+            if (!BitConverter.IsLittleEndian)
+            {
+                data = data.Reverse().ToArray();
+            }
+            Buffer.BlockCopy(data, 0, _buffer, offset, data.Length);
+        }
+
+        protected byte[] ReadLittleEndian(int offset, int count)
+        {
+            AssertOffsetAndLength(offset, count);
+            var tmp = new byte[count];
+            Buffer.BlockCopy(_buffer, offset, tmp, 0, count);
+            return (BitConverter.IsLittleEndian)
+              ? tmp
+              : tmp.Reverse().ToArray();
+        }
+
+        private void AssertOffsetAndLength(int offset, int length)
+        {
+            if (offset < 0 ||
+                offset >= _buffer.Length ||
+                offset + length > _buffer.Length)
+                throw new ArgumentOutOfRangeException();
+        }
+
+        public void PutByte(int offset, byte value)
+        {
+            AssertOffsetAndLength(offset, sizeof(byte));
+            _buffer[offset] = value;
+        }
+
+        public void PutShort(int offset, short value)
+        {
+            AssertOffsetAndLength(offset, sizeof(short));
+            WriteLittleEndian(offset, BitConverter.GetBytes(value));
+        }
+
+        public void PutInt(int offset, int value)
+        {
+            AssertOffsetAndLength(offset, sizeof(int));
+            WriteLittleEndian(offset, BitConverter.GetBytes(value));
+        }
+
+        public void PutLong(int offset, long value)
+        {
+            AssertOffsetAndLength(offset, sizeof(long));
+            WriteLittleEndian(offset, BitConverter.GetBytes(value));
+        }
+
+        public void PutFloat(int offset, float value)
+        {
+            AssertOffsetAndLength(offset, sizeof(float));
+            WriteLittleEndian(offset, BitConverter.GetBytes(value));
+        }
+
+        public void PutDouble(int offset, double value)
+        {
+            AssertOffsetAndLength(offset, sizeof(double));
+            WriteLittleEndian(offset, BitConverter.GetBytes(value));
+        }
+
+        public byte Get(int index)
+        {
+            AssertOffsetAndLength(index, sizeof(byte));
+            return _buffer[index];
+        }
+
+        public short GetShort(int index)
+        {
+            var tmp = ReadLittleEndian(index, sizeof(short));
+            var value = BitConverter.ToInt16(tmp, 0);
+            return value;
+        }
+
+        public int GetInt(int index)
+        {
+            var tmp = ReadLittleEndian(index, sizeof(int));
+            var value = BitConverter.ToInt32(tmp, 0);
+            return value;
+        }
+
+        public long GetLong(int index)
+        {
+            var tmp = ReadLittleEndian(index, sizeof(long));
+            var value = BitConverter.ToInt64(tmp, 0);
+            return value;
+        }
+
+        public float GetFloat(int index)
+        {
+            var tmp = ReadLittleEndian(index, sizeof(float));
+            var value = BitConverter.ToSingle(tmp, 0);
+            return value;
+        }
+
+        public double GetDouble(int index)
+        {
+            var tmp = ReadLittleEndian(index, sizeof(double));
+            var value = BitConverter.ToDouble(tmp, 0);
+            return value;
+        }
+    }
+}