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119 lines
3.8 KiB
119 lines
3.8 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Utility functions for working with FlatBuffers.
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#ifndef LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
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#define LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
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#include <string>
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#include "annotator/model_generated.h"
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#include "flatbuffers/flatbuffers.h"
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namespace libtextclassifier3 {
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// Loads and interprets the buffer as 'FlatbufferMessage' and verifies its
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// integrity.
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template <typename FlatbufferMessage>
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const FlatbufferMessage* LoadAndVerifyFlatbuffer(const void* buffer, int size) {
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const FlatbufferMessage* message =
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flatbuffers::GetRoot<FlatbufferMessage>(buffer);
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if (message == nullptr) {
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return nullptr;
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}
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flatbuffers::Verifier verifier(reinterpret_cast<const uint8_t*>(buffer),
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size);
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if (message->Verify(verifier)) {
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return message;
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} else {
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return nullptr;
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}
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}
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// Same as above but takes string.
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template <typename FlatbufferMessage>
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const FlatbufferMessage* LoadAndVerifyFlatbuffer(const std::string& buffer) {
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return LoadAndVerifyFlatbuffer<FlatbufferMessage>(buffer.c_str(),
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buffer.size());
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}
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// Loads and interprets the buffer as 'FlatbufferMessage', verifies its
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// integrity and returns its mutable version.
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template <typename FlatbufferMessage>
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std::unique_ptr<typename FlatbufferMessage::NativeTableType>
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LoadAndVerifyMutableFlatbuffer(const void* buffer, int size) {
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const FlatbufferMessage* message =
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LoadAndVerifyFlatbuffer<FlatbufferMessage>(buffer, size);
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if (message == nullptr) {
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return nullptr;
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}
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return std::unique_ptr<typename FlatbufferMessage::NativeTableType>(
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message->UnPack());
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}
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// Same as above but takes string.
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template <typename FlatbufferMessage>
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std::unique_ptr<typename FlatbufferMessage::NativeTableType>
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LoadAndVerifyMutableFlatbuffer(const std::string& buffer) {
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return LoadAndVerifyMutableFlatbuffer<FlatbufferMessage>(buffer.c_str(),
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buffer.size());
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}
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template <typename FlatbufferMessage>
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const char* FlatbufferFileIdentifier() {
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return nullptr;
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}
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template <>
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inline const char* FlatbufferFileIdentifier<Model>() {
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return ModelIdentifier();
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}
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// Packs the mutable flatbuffer message to string.
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template <typename FlatbufferMessage>
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std::string PackFlatbuffer(
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const typename FlatbufferMessage::NativeTableType* mutable_message) {
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flatbuffers::FlatBufferBuilder builder;
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builder.Finish(FlatbufferMessage::Pack(builder, mutable_message),
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FlatbufferFileIdentifier<FlatbufferMessage>());
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return std::string(reinterpret_cast<const char*>(builder.GetBufferPointer()),
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builder.GetSize());
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}
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// A convenience flatbuffer object with its underlying buffer.
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template <typename T, typename B = flatbuffers::DetachedBuffer>
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class OwnedFlatbuffer {
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public:
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explicit OwnedFlatbuffer(B&& buffer) : buffer_(std::move(buffer)) {}
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// Cast as flatbuffer type.
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const T* get() const { return flatbuffers::GetRoot<T>(buffer_.data()); }
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const B& buffer() const { return buffer_; }
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const T* operator->() const {
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return flatbuffers::GetRoot<T>(buffer_.data());
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}
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private:
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B buffer_;
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};
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
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