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diff --git a/src/util.h b/src/util.h
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+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SRC_UTIL_H_
+#define SRC_UTIL_H_
+
+#include "v8.h"
+#include <stddef.h>
+
+namespace node {
+
+#define OFFSET_OF(TypeName, Field)                                            \
+  (reinterpret_cast<uintptr_t>(&(reinterpret_cast<TypeName*>(8)->Field)) - 8)
+
+#define CONTAINER_OF(Pointer, TypeName, Field)                                \
+  reinterpret_cast<TypeName*>(                                                \
+      reinterpret_cast<uintptr_t>(Pointer) - OFFSET_OF(TypeName, Field))
+
+#define FIXED_ONE_BYTE_STRING(isolate, string)                                \
+  (node::OneByteString((isolate), (string), sizeof(string) - 1))
+
+#define DISALLOW_COPY_AND_ASSIGN(TypeName)                                    \
+  void operator=(const TypeName&);                                            \
+  TypeName(const TypeName&)
+
+// If persistent.IsWeak() == false, then do not call persistent.Dispose()
+// while the returned Local<T> is still in scope, it will destroy the
+// reference to the object.
+template <class TypeName>
+inline v8::Local<TypeName> PersistentToLocal(
+    v8::Isolate* isolate,
+    const v8::Persistent<TypeName>& persistent);
+
+// Unchecked conversion from a non-weak Persistent<T> to Local<TLocal<T>,
+// use with care!
+//
+// Do not call persistent.Dispose() while the returned Local<T> is still in
+// scope, it will destroy the reference to the object.
+template <class TypeName>
+inline v8::Local<TypeName> StrongPersistentToLocal(
+    const v8::Persistent<TypeName>& persistent);
+
+template <class TypeName>
+inline v8::Local<TypeName> WeakPersistentToLocal(
+    v8::Isolate* isolate,
+    const v8::Persistent<TypeName>& persistent);
+
+// Convenience wrapper around v8::String::NewFromOneByte().
+inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
+                                           const char* data,
+                                           int length = -1);
+
+// For the people that compile with -funsigned-char.
+inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
+                                           const signed char* data,
+                                           int length = -1);
+
+inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
+                                           const unsigned char* data,
+                                           int length = -1);
+
+}  // namespace node
+
+#endif  // SRC_UTIL_H_