| // 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) { |
| if (handle->is_valid()) { |
| handles->push_back(*handle); |
| handle->set_value(static_cast<MojoHandle>(handles->size() - 1)); |
| } else { |
| // Encode -1 to mean the invalid handle. |
| handle->set_value(static_cast<MojoHandle>(-1)); |
| } |
| } |
| |
| bool DecodeHandle(Handle* handle, std::vector<Handle>* handles) { |
| // Decode -1 to mean the invalid handle. |
| if (handle->value() == static_cast<MojoHandle>(-1)) { |
| *handle = Handle(); |
| return true; |
| } |
| if (handle->value() >= handles->size()) |
| return false; |
| // Just leave holes in the vector so we don't screw up other indices. |
| *handle = FetchAndReset(&handles->at(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, |
| 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 |