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// Copyright 2022 The Dawn Authors
//
// 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.
#ifndef SRC_DAWN_NATIVE_BLOB_H_
#define SRC_DAWN_NATIVE_BLOB_H_
#include <cstdint>
#include <functional>
#include <type_traits>
#include <utility>
#include <vector>
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;
// If the blob data is not aligned to |alignment|, copy it into a new backing store which
// is aligned.
void AlignTo(size_t alignment);
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);
uint8_t* mData;
size_t mSize;
std::function<void()> mDeleter;
};
Blob CreateBlob(size_t size, size_t alignment = 1);
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_