| // Copyright 2022 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef SRC_DAWN_NATIVE_BLOB_H_ |
| #define SRC_DAWN_NATIVE_BLOB_H_ |
| |
| #include <cstdint> |
| #include <functional> |
| #include <type_traits> |
| #include <utility> |
| #include <vector> |
| |
| #include "partition_alloc/pointers/raw_ptr.h" |
| |
| namespace dawn::native { |
| |
| // Blob represents a block of bytes. It may be constructed from |
| // various other container types and uses type erasure to take |
| // ownership of the container and release its memory on destruction. |
| class Blob { |
| public: |
| // This function is used to create Blob with actual data. |
| // Make sure the creation and deleter handles the data ownership and lifetime correctly. |
| static Blob UnsafeCreateWithDeleter(uint8_t* data, size_t size, std::function<void()> deleter); |
| |
| Blob(); |
| ~Blob(); |
| |
| Blob(const Blob&) = delete; |
| Blob& operator=(const Blob&) = delete; |
| |
| Blob(Blob&&); |
| Blob& operator=(Blob&&); |
| |
| bool Empty() const; |
| const uint8_t* Data() const; |
| uint8_t* Data(); |
| size_t Size() const; |
| |
| private: |
| // The constructor should be responsible to take ownership of |data| and releases ownership by |
| // calling |deleter|. The deleter function is called at ~Blob() and during std::move. |
| explicit Blob(uint8_t* data, size_t size, std::function<void()> deleter); |
| |
| raw_ptr<uint8_t> mData; |
| size_t mSize; |
| std::function<void()> mDeleter; |
| }; |
| |
| Blob CreateBlob(size_t size); |
| |
| template <typename T, typename = std::enable_if_t<std::is_fundamental_v<T>>> |
| Blob CreateBlob(std::vector<T> vec) { |
| uint8_t* data = reinterpret_cast<uint8_t*>(vec.data()); |
| size_t size = vec.size() * sizeof(T); |
| // Move the vector into a new allocation so we can destruct it in the deleter. |
| auto* wrapped_vec = new std::vector<T>(std::move(vec)); |
| return Blob::UnsafeCreateWithDeleter(data, size, [wrapped_vec] { delete wrapped_vec; }); |
| } |
| |
| } // namespace dawn::native |
| |
| #endif // SRC_DAWN_NATIVE_BLOB_H_ |