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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. 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.
*/
#include "RawModelLoader.h"
#include "cwrap/Fildes.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
namespace
{
class MemoryMappedRawModel final : public RawModel
{
public:
/**
* @require fd and data SHOULD be valid
*/
explicit MemoryMappedRawModel(int fd, void *data, size_t size) : _fd{fd}, _data{data}, _size{size}
{
// DO NOTHING
}
public:
~MemoryMappedRawModel()
{
munmap(_data, _size);
close(_fd);
}
public:
MemoryMappedRawModel(const MemoryMappedRawModel &) = delete;
MemoryMappedRawModel(MemoryMappedRawModel &&) = delete;
public:
const tflite::Model *model(void) const override { return tflite::GetModel(_data); }
private:
int _fd = -1;
void *_data = nullptr;
size_t _size = 0;
};
} // namespace
std::unique_ptr<RawModel> load_from(const std::string &path)
{
cwrap::Fildes fildes{open(path.c_str(), O_RDONLY)};
if (fildes.get() == -1)
{
// Return nullptr on open failure
return nullptr;
}
struct stat st;
if (fstat(fildes.get(), &st) == -1)
{
// Return nullptr on fstat failure
return nullptr;
}
auto size = st.st_size;
auto data = mmap(nullptr, size, PROT_READ, MAP_SHARED, fildes.get(), 0);
if (data == MAP_FAILED)
{
// Return nullptr on mmap failure
return nullptr;
}
return std::unique_ptr<RawModel>{new MemoryMappedRawModel(fildes.release(), data, size)};
}
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