Mojo C++ bindings

mojo/public/bindings/lib/bindings_serialization.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/lib/bindings_serialization.h"
+
+#include <assert.h>
+
+namespace mojo {
+namespace internal {
+
+size_t Align(size_t size) {
+  const size_t kAlignment = 8;
+  return size + (kAlignment - (size % kAlignment)) % kAlignment;
+}
+
+void EncodePointer(const void* ptr, uint64_t* offset) {
+  if (!ptr) {
+    *offset = 0;
+    return;
+  }
+
+  const char* p_obj = reinterpret_cast<const char*>(ptr);
+  const char* p_slot = reinterpret_cast<const char*>(offset);
+  assert(p_obj > p_slot);
+
+  *offset = static_cast<uint64_t>(p_obj - p_slot);
+}
+
+const void* DecodePointerRaw(const uint64_t* offset) {
+  if (!*offset)
+    return NULL;
+  return reinterpret_cast<const char*>(offset) + *offset;
+}
+
+bool ValidatePointer(const void* ptr, const Message& message) {
+  const uint8_t* data = static_cast<const uint8_t*>(ptr);
+  if (reinterpret_cast<ptrdiff_t>(data) % 8 != 0)
+    return false;
+
+  const uint8_t* data_start = reinterpret_cast<const uint8_t*>(message.data);
+  const uint8_t* data_end = data_start + message.data->header.num_bytes;
+
+  return data >= data_start && data < 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;
+}
+
+// static
+void ArrayHelper<Handle>::EncodePointersAndHandles(
+    const ArrayHeader* header,
+    ElementType* elements,
+    std::vector<Handle>* handles) {
+  for (uint32_t i = 0; i < header->num_elements; ++i)
+    EncodeHandle(&elements[i], handles);
+}
+
+// static
+bool ArrayHelper<Handle>::DecodePointersAndHandles(
+    const ArrayHeader* header,
+    ElementType* elements,
+    const Message& message) {
+  for (uint32_t i = 0; i < header->num_elements; ++i) {
+    if (!DecodeHandle(&elements[i], message.handles))
+      return false;
+  }
+  return true;
+}
+
+}  // namespace internal
+}  // namespace mojo