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/Table.cs

@@ -0,0 +1,92 @@
+/*
+ * 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.Text;
+
+namespace FlatBuffers
+{
+    /// <summary>
+    /// All tables in the generated code derive from this class, and add their own accessors.
+    /// </summary>
+    public abstract class Table
+    {
+        protected int bb_pos;
+        protected ByteBuffer bb;
+
+        // Look up a field in the vtable, return an offset into the object, or 0 if the field is not
+        // present.
+        protected int __offset(int vtableOffset)
+        {
+            int vtable = bb_pos - bb.GetInt(bb_pos);
+            return vtableOffset < bb.GetShort(vtable) ? bb.GetShort(vtable + vtableOffset) : 0;
+        }
+
+        // Retrieve the relative offset stored at "offset"
+        protected int __indirect(int offset)
+        {
+            return offset + bb.GetInt(offset);
+        }
+
+        // Create a .NET String from UTF-8 data stored inside the flatbuffer.
+        protected string __string(int offset)
+        {
+            offset += bb.GetInt(offset);
+            var len = bb.GetInt(offset);
+            var startPos = offset + sizeof(int);
+            return Encoding.UTF8.GetString(bb.Data, startPos , len);
+        }
+
+        // Get the length of a vector whose offset is stored at "offset" in this object.
+        protected int __vector_len(int offset)
+        {
+            offset += bb_pos;
+            offset += bb.GetInt(offset);
+            return bb.GetInt(offset);
+        }
+
+        // Get the start of data of a vector whose offset is stored at "offset" in this object.
+        protected int __vector(int offset)
+        {
+            offset += bb_pos;
+            return offset + bb.GetInt(offset) + sizeof(int);  // data starts after the length
+        }
+
+        // Initialize any Table-derived type to point to the union at the given offset.
+        protected Table __union(Table t, int offset)
+        {
+            offset += bb_pos;
+            t.bb_pos = offset + bb.GetInt(offset);
+            t.bb = bb;
+            return t;
+        }
+
+        protected static bool __has_identifier(ByteBuffer bb, int offset, string ident)
+        {
+            if (ident.Length != FlatBufferConstants.FileIdentifierLength)
+                throw new ArgumentException("FlatBuffers: file identifier must be length " + FlatBufferConstants.FileIdentifierLength, "ident");
+
+            for (var i = 0; i < FlatBufferConstants.FileIdentifierLength; i++)
+            {
+                if (ident[i] != (char)bb.Get(offset + sizeof(int) + i)) return false;
+            }
+
+            return true;
+        }
+
+
+    }
+}