Allocate a Dart_CMessage structure when decoding a message into C structures

runtime/vm/dart_api_impl.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
@@ skipping 2479 matching lines @@
       *buffer = NULL;
     }
     delete debug_region;
   } else {
     *buffer = NULL;
     *buffer_size = 0;
   }
 }
 
 
+// --- Message encoding/decoding ----
+
+
+DART_EXPORT Dart_CMessage* Dart_DecodeMessage(uint8_t* message,
+                                              intptr_t length,
+                                              Allocator allocator) {
+  CMessageReader reader(message, length, allocator);
+  return reader.ReadMessage();
+}
+
 }  // namespace dart