C++ bindings

mojo/public/bindings/bindings_internal.cc

+// 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.
+
+#include "mojo/public/bindings/bindings_internal.h"
+
+namespace mojo {
+namespace internal {
+
+void EncodePointer(void* address, uint64_t* offset) {
+  if (!address) {
+    *offset = 0;
+    return;
+  }
+  uint8_t* p_obj = reinterpret_cast<uint8_t*>(address);
+  uint8_t* p_slot = reinterpret_cast<uint8_t*>(offset);
+  assert(p_obj > p_slot);
+  *offset = p_obj - p_slot;
+}
+
+uint8_t* DecodePointerRaw(uint64_t* offset) {
+  if (!*offset)
+    return NULL;
+  return reinterpret_cast<uint8_t*>(offset) + *offset;
+}
+
+bool ValidatePointer(const void* ptr, const Message& message) {
+  const uint8_t* data = static_cast<const uint8_t*>(ptr);
+  /* TODO: Enforce alignment
+  if (reinterpret_cast<ptrdiff_t>(data) % 8 != 0)
+    return false;
+  */
+  return data >= message.data_start && data < message.data_end;
+}
+
+void EncodeHandle(Handle* handle, std::vector<Handle>* handles) {
+  handles->push_back(*handle);
+  handle->value = static_cast<MojoHandle>(handles->size() - 1);
+}
+
+bool DecodeHandle(Handle* handle, const std::vector<Handle>& handles) {
+  if (handle->value >= handles.size())
+    return false;
+  *handle = handles[handle->value];
+  return true;
+}
+
+}  // namespace internal
+}  // namespace mojo