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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*/
// Utility functions for working with FlatBuffers.
#ifndef LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
#define LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
#include <iostream>
#include <string>
#include "annotator/model_generated.h"
#include "flatbuffers/flatbuffers.h"
namespace libtextclassifier3 {
// Loads and interprets the buffer as 'FlatbufferMessage' and verifies its
// integrity.
template <typename FlatbufferMessage>
const FlatbufferMessage* LoadAndVerifyFlatbuffer(const void* buffer, int size) {
if (size == 0) {
return nullptr;
}
const FlatbufferMessage* message =
flatbuffers::GetRoot<FlatbufferMessage>(buffer);
if (message == nullptr) {
return nullptr;
}
flatbuffers::Verifier verifier(reinterpret_cast<const uint8_t*>(buffer),
size);
if (message->Verify(verifier)) {
return message;
} else {
// TODO(217577534): Need to figure out why the verifier is failing.
return message;
}
}
// Same as above but takes string.
template <typename FlatbufferMessage>
const FlatbufferMessage* LoadAndVerifyFlatbuffer(const std::string& buffer) {
return LoadAndVerifyFlatbuffer<FlatbufferMessage>(buffer.c_str(),
buffer.size());
}
// Loads and interprets the buffer as 'FlatbufferMessage', verifies its
// integrity and returns its mutable version.
template <typename FlatbufferMessage>
std::unique_ptr<typename FlatbufferMessage::NativeTableType>
LoadAndVerifyMutableFlatbuffer(const void* buffer, int size) {
const FlatbufferMessage* message =
LoadAndVerifyFlatbuffer<FlatbufferMessage>(buffer, size);
if (message == nullptr) {
return nullptr;
}
return std::unique_ptr<typename FlatbufferMessage::NativeTableType>(
message->UnPack());
}
// Same as above but takes string.
template <typename FlatbufferMessage>
std::unique_ptr<typename FlatbufferMessage::NativeTableType>
LoadAndVerifyMutableFlatbuffer(const std::string& buffer) {
return LoadAndVerifyMutableFlatbuffer<FlatbufferMessage>(buffer.c_str(),
buffer.size());
}
template <typename FlatbufferMessage>
const char* FlatbufferFileIdentifier() {
return nullptr;
}
template <>
inline const char* FlatbufferFileIdentifier<Model>() {
return ModelIdentifier();
}
// Packs the mutable flatbuffer message to string.
template <typename FlatbufferMessage>
std::string PackFlatbuffer(
const typename FlatbufferMessage::NativeTableType* mutable_message) {
flatbuffers::FlatBufferBuilder builder;
builder.Finish(FlatbufferMessage::Pack(builder, mutable_message),
FlatbufferFileIdentifier<FlatbufferMessage>());
return std::string(reinterpret_cast<const char*>(builder.GetBufferPointer()),
builder.GetSize());
}
// A convenience flatbuffer object with its underlying buffer.
template <typename T, typename B = flatbuffers::DetachedBuffer>
class OwnedFlatbuffer {
public:
explicit OwnedFlatbuffer(B&& buffer) : buffer_(std::move(buffer)) {}
// Cast as flatbuffer type.
const T* get() const { return flatbuffers::GetRoot<T>(buffer_.data()); }
const B& buffer() const { return buffer_; }
const T* operator->() const {
return flatbuffers::GetRoot<T>(buffer_.data());
}
private:
B buffer_;
};
} // namespace libtextclassifier3
#endif // LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_FLATBUFFERS_H_
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