Tom Cherry | 88ada53 | 2020-06-24 13:51:04 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2020 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #pragma once |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | |
| 21 | #include <algorithm> |
| 22 | #include <memory> |
| 23 | |
| 24 | // This class is used instead of std::string or std::vector because their clear(), erase(), etc |
| 25 | // functions don't actually deallocate. shrink_to_fit() does deallocate but is not guaranteed to |
| 26 | // work and swapping with an empty string/vector is clunky. |
| 27 | class SerializedData { |
| 28 | public: |
| 29 | SerializedData() {} |
| 30 | SerializedData(size_t size) : data_(new uint8_t[size]), size_(size) {} |
| 31 | |
| 32 | void Resize(size_t new_size) { |
| 33 | if (size_ == 0) { |
| 34 | data_.reset(new uint8_t[new_size]); |
| 35 | size_ = new_size; |
| 36 | } else if (new_size == 0) { |
| 37 | data_.reset(); |
| 38 | size_ = 0; |
| 39 | } else if (new_size != size_) { |
| 40 | std::unique_ptr<uint8_t[]> new_data(new uint8_t[new_size]); |
| 41 | size_t copy_size = std::min(size_, new_size); |
| 42 | memcpy(new_data.get(), data_.get(), copy_size); |
| 43 | data_.swap(new_data); |
| 44 | size_ = new_size; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | uint8_t* data() { return data_.get(); } |
| 49 | const uint8_t* data() const { return data_.get(); } |
| 50 | size_t size() const { return size_; } |
| 51 | |
| 52 | private: |
| 53 | std::unique_ptr<uint8_t[]> data_; |
| 54 | size_t size_ = 0; |
| 55 | }; |