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123 lines
3.4 KiB
123 lines
3.4 KiB
/*
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* Copyright (c) 2020-2021, NVIDIA CORPORATION. All rights reserved.
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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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* SPDX-FileCopyrightText: Copyright (c) 2020-2021 NVIDIA CORPORATION
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* SPDX-License-Identifier: Apache-2.0
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*/
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/// \nodoc (keyword to exclude this file from automatic README.md generation)
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#pragma once
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#include <cstddef>
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#include <utility>
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namespace nvh {
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class FileMapping
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{
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public:
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FileMapping(FileMapping&& other) noexcept { this->operator=(std::move(other)); };
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FileMapping& operator=(FileMapping&& other) noexcept
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{
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m_isValid = other.m_isValid;
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m_fileSize = other.m_fileSize;
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m_mappingType = other.m_mappingType;
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m_mappingPtr = other.m_mappingPtr;
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m_mappingSize = other.m_mappingSize;
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#ifdef _WIN32
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m_win32.file = other.m_win32.file;
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m_win32.fileMapping = other.m_win32.fileMapping;
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other.m_win32.file = nullptr;
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other.m_win32.fileMapping = nullptr;
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#else
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m_unix.file = other.m_unix.file;
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other.m_unix.file = -1;
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#endif
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other.m_isValid = false;
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other.m_mappingPtr = nullptr;
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return *this;
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}
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FileMapping(const FileMapping&) = delete;
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FileMapping& operator=(const FileMapping& other) = delete;
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FileMapping() {}
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~FileMapping() { close(); }
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enum MappingType
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{
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MAPPING_READONLY, // opens existing file for read-only access
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MAPPING_READOVERWRITE, // creates new file with read/write access, overwriting existing files
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};
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// fileSize only for write access
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bool open(const char* filename, MappingType mappingType, size_t fileSize = 0);
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void close();
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const void* data() const { return m_mappingPtr; }
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void* data() { return m_mappingPtr; }
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size_t size() const { return m_mappingSize; }
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bool valid() const { return m_isValid; }
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protected:
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static size_t g_pageSize;
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#ifdef _WIN32
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struct
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{
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void* file = nullptr;
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void* fileMapping = nullptr;
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} m_win32;
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#else
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struct
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{
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int file = -1;
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} m_unix;
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#endif
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bool m_isValid = false;
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size_t m_fileSize = 0;
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MappingType m_mappingType = MappingType::MAPPING_READONLY;
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void* m_mappingPtr = nullptr;
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size_t m_mappingSize = 0;
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};
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// convenience types
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class FileReadMapping : private FileMapping
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{
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public:
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bool open(const char* filename) { return FileMapping::open(filename, MAPPING_READONLY, 0); }
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void close() { FileMapping::close(); }
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const void* data() const { return m_mappingPtr; }
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size_t size() const { return m_fileSize; }
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bool valid() const { return m_isValid; }
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};
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class FileReadOverWriteMapping : private FileMapping
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{
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public:
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bool open(const char* filename, size_t fileSize)
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{
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return FileMapping::open(filename, MAPPING_READOVERWRITE, fileSize);
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}
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void close() { FileMapping::close(); }
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void* data() { return m_mappingPtr; }
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size_t size() const { return m_fileSize; }
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bool valid() const { return m_isValid; }
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};
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} // namespace nvh
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