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/*
* Copyright (c) 2019 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 "Model.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
namespace
{
class MemoryMappedModel final : public circleinspect::Model
{
public:
/**
* @require fd and data SHOULD be valid
*/
explicit MemoryMappedModel(int fd, void *data, size_t size) : _fd{fd}, _data{data}, _size{size}
{
// DO NOTHING
}
public:
~MemoryMappedModel()
{
munmap(_data, _size);
close(_fd);
}
public:
MemoryMappedModel(const MemoryMappedModel &) = delete;
MemoryMappedModel(MemoryMappedModel &&) = delete;
public:
const ::circle::Model *model(void) const override { return ::circle::GetModel(_data); }
private:
int _fd = -1;
void *_data = nullptr;
size_t _size = 0;
};
class FileDescriptor final
{
public:
FileDescriptor(int value) : _value{value}
{
// DO NOTHING
}
public:
// NOTE Copy is not allowed
FileDescriptor(const FileDescriptor &) = delete;
public:
// NOTE Move is allowed
FileDescriptor(FileDescriptor &&fd) { _value = fd.release(); }
public:
~FileDescriptor()
{
if (_value != -1)
{
// Close on descturction
close(_value);
}
}
public:
int value(void) const { return _value; }
public:
int release(void)
{
auto res = _value;
_value = -1;
return res;
}
private:
int _value = -1;
};
} // namespace
namespace circleinspect
{
std::unique_ptr<Model> load_circle(const std::string &path)
{
FileDescriptor fd = open(path.c_str(), O_RDONLY);
if (fd.value() == -1)
{
// Return nullptr on open failure
return nullptr;
}
struct stat st;
if (fstat(fd.value(), &st) == -1)
{
// Return nullptr on fstat failure
return nullptr;
}
auto size = st.st_size;
auto data = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd.value(), 0);
if (data == MAP_FAILED)
{
// Return nullptr on mmap failure
return nullptr;
}
// Check if file is a valid Flatbuffer file
const uint8_t *u8data = reinterpret_cast<const uint8_t *>(data);
flatbuffers::Verifier verifier{u8data, static_cast<size_t>(size)};
if (!circle::VerifyModelBuffer(verifier))
{
munmap(data, size);
close(fd.release());
return nullptr;
}
return std::unique_ptr<circleinspect::Model>{new MemoryMappedModel(fd.release(), data, size)};
}
} // namespace circleinspect
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