| // Copyright 2015 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/xhr/xhr_response_data.h" |
| |
| #include <algorithm> |
| |
| #include "cobalt/dom/global_stats.h" |
| |
| namespace cobalt { |
| namespace xhr { |
| |
| namespace { |
| |
| // When we don't have any data, we still want to return a non-null pointer to a |
| // valid memory location. Because even it will never be accessed, a null |
| // pointer may trigger undefined behavior in functions like memcpy. So we |
| // create this dummy value here and return its address when we don't have any |
| // data. |
| uint8 s_dummy; |
| |
| // We are using std::string to store binary data so we want to ensure that char |
| // occupies one byte. |
| COMPILE_ASSERT(sizeof(char) == 1, char_should_occupy_one_byte); |
| |
| } // namespace |
| |
| XhrResponseData::XhrResponseData() { |
| dom::GlobalStats::GetInstance()->IncreaseXHRMemoryUsage(capacity()); |
| } |
| |
| XhrResponseData::~XhrResponseData() { |
| dom::GlobalStats::GetInstance()->DecreaseXHRMemoryUsage(capacity()); |
| } |
| |
| void XhrResponseData::Clear() { |
| dom::GlobalStats::GetInstance()->DecreaseXHRMemoryUsage(capacity()); |
| // Use swap to force free the memory allocated. |
| std::string dummy; |
| data_.swap(dummy); |
| dom::GlobalStats::GetInstance()->IncreaseXHRMemoryUsage(capacity()); |
| } |
| |
| void XhrResponseData::Reserve(size_t new_capacity_bytes) { |
| dom::GlobalStats::GetInstance()->DecreaseXHRMemoryUsage(capacity()); |
| data_.reserve(new_capacity_bytes); |
| dom::GlobalStats::GetInstance()->IncreaseXHRMemoryUsage(capacity()); |
| } |
| |
| void XhrResponseData::Append(const uint8* source_data, size_t size_bytes) { |
| if (size_bytes == 0) { |
| return; |
| } |
| dom::GlobalStats::GetInstance()->DecreaseXHRMemoryUsage(capacity()); |
| data_.resize(data_.size() + size_bytes); |
| memcpy(&data_[data_.size() - size_bytes], source_data, size_bytes); |
| dom::GlobalStats::GetInstance()->IncreaseXHRMemoryUsage(capacity()); |
| } |
| |
| const uint8* XhrResponseData::data() const { |
| return data_.empty() ? &s_dummy : reinterpret_cast<const uint8*>(&data_[0]); |
| } |
| |
| uint8* XhrResponseData::data() { |
| return data_.empty() ? &s_dummy : reinterpret_cast<uint8*>(&data_[0]); |
| } |
| |
| } // namespace xhr |
| } // namespace cobalt |