Mojo: Move mojo/public/bindings/lib to mojo/public/cpp/bindings/lib.

R=darin@chromium.org

Review URL: https://codereview.chromium.org/220243007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260886 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 67 insertions, 0 deletions

diff --git a/mojo/public/cpp/bindings/lib/bindings_serialization.h b/mojo/public/cpp/bindings/lib/bindings_serialization.h
new file mode 100644
index 0000000..a860b14
--- /dev/null
+++ b/mojo/public/cpp/bindings/lib/bindings_serialization.h
@@ -0,0 +1,67 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_
+
+#include <vector>
+
+#include "mojo/public/cpp/bindings/buffer.h"
+#include "mojo/public/cpp/bindings/message.h"
+
+namespace mojo {
+namespace internal {
+
+size_t Align(size_t size);
+
+// Pointers are encoded as relative offsets. The offsets are relative to the
+// address of where the offset value is stored, such that the pointer may be
+// recovered with the expression:
+//
+//   ptr = reinterpret_cast<char*>(offset) + *offset
+//
+// A null pointer is encoded as an offset value of 0.
+//
+void EncodePointer(const void* ptr, uint64_t* offset);
+const void* DecodePointerRaw(const uint64_t* offset);
+
+template <typename T>
+inline void DecodePointer(const uint64_t* offset, T** ptr) {
+  *ptr = reinterpret_cast<T*>(const_cast<void*>(DecodePointerRaw(offset)));
+}
+
+// Check that the given pointer references memory contained within the message.
+bool ValidatePointer(const void* ptr, const Message& message);
+
+// Handles are encoded as indices into a vector of handles. These functions
+// manipulate the value of |handle|, mapping it to and from an index.
+void EncodeHandle(Handle* handle, std::vector<Handle>* handles);
+bool DecodeHandle(Handle* handle, std::vector<Handle>* handles);
+
+// The following 2 functions are used to encode/decode all objects (structs and
+// arrays) in a consistent manner.
+
+template <typename T>
+inline void Encode(T* obj, std::vector<Handle>* handles) {
+  if (obj->ptr)
+    obj->ptr->EncodePointersAndHandles(handles);
+  EncodePointer(obj->ptr, &obj->offset);
+}
+
+template <typename T>
+inline bool Decode(T* obj, Message* message) {
+  DecodePointer(&obj->offset, &obj->ptr);
+  if (obj->ptr) {
+    if (!ValidatePointer(obj->ptr, *message))
+      return false;
+    if (!obj->ptr->DecodePointersAndHandles(message))
+      return false;
+  }
+  return true;
+}
+
+}  // namespace internal
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_H_