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/*
* Copyright 2020 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.
*/
#ifndef CHRE_PLATFORM_SHARED_FLATBUFFERS_HELPERS_H_
#define CHRE_PLATFORM_SHARED_FLATBUFFERS_HELPERS_H_
#include "chre/util/container_support.h"
#include "chre/util/dynamic_vector.h"
#include "flatbuffers/flatbuffers.h"
namespace chre {
//! CHRE-specific flatbuffers allocator that routes to CHRE's alloc / free
//! functions.
class FlatBufferAllocator : public flatbuffers::Allocator {
public:
uint8_t *allocate(size_t size) override {
return static_cast<uint8_t *>(memoryAlloc(size));
}
void deallocate(uint8_t *p, size_t) override {
memoryFree(p);
}
};
//! CHRE-specific FlatBufferBuilder that utilizes CHRE's allocator and adds
//! additional helper methods that make use of CHRE utilities.
class ChreFlatBufferBuilder : public flatbuffers::FlatBufferBuilder {
public:
explicit ChreFlatBufferBuilder(size_t initialSize = 1024)
: flatbuffers::FlatBufferBuilder(initialSize, &mAllocator) {}
// This is defined in flatbuffers::FlatBufferBuilder, but must be further
// defined here since template functions aren't inherited.
template <typename T>
flatbuffers::Offset<flatbuffers::Vector<T>> CreateVector(const T *v,
size_t len) {
return flatbuffers::FlatBufferBuilder::CreateVector(v, len);
}
/**
* Serialize a DyanmicVector into a FlatBuffer `vector`.
*
* @tparam T The data type of the DynamicVector elements.
* @param v A const reference to the DynamicVector to serialize into the
* buffer as a `vector`.
* @return Returns a typed `Offset` into the serialized data indicating
* where the vector is stored.
*/
template <typename T>
flatbuffers::Offset<flatbuffers::Vector<T>> CreateVector(
const DynamicVector<T> &v) {
return flatbuffers::FlatBufferBuilder::CreateVector(v.data(), v.size());
}
private:
FlatBufferAllocator mAllocator;
};
} // namespace chre
#endif // CHRE_PLATFORM_SHARED_FLATBUFFERS_HELPERS_H_
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