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https://github.com/Tencent/MMKV.git
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guoling
75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
/*
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* Tencent is pleased to support the open source community by making
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* MMKV available.
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*
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* Copyright (C) 2018 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use
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* this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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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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#ifndef MMKV_MMAPEDFILE_H
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#define MMKV_MMAPEDFILE_H
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#include "MMKVPredef.h"
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#include <string>
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#include <sys/mman.h>
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namespace mmkv {
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enum SyncFlag : bool { MMAP_SYNC = true, MMAP_ASYNC = false };
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class MemoryFile {
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std::string m_name;
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int m_fd;
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void *m_ptr;
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size_t m_size;
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public:
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explicit MemoryFile(const std::string &path, size_t size);
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~MemoryFile();
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// just forbid it for possibly misuse
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MemoryFile(const MemoryFile &other) = delete;
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MemoryFile &operator=(const MemoryFile &other) = delete;
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size_t getFileSize() { return m_size; }
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void *getMemory() { return m_ptr; }
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std::string &getName() { return m_name; }
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int getFd() { return m_fd; }
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// the newly expanded file content will be zeroed
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bool truncate(size_t size);
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bool msync(SyncFlag syncFlag);
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bool isFileValid() { return m_fd >= 0 && m_size > 0 && m_ptr; }
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};
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class MMBuffer;
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extern bool mkPath(char *path);
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extern bool isFileExist(const std::string &nsFilePath);
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extern bool removeFile(const std::string &nsFilePath);
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extern MMBuffer *readWholeFile(const char *path);
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extern bool zeroFillFile(int fd, size_t startPos, size_t size);
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extern bool createFile(const std::string &filePath);
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} // namespace mmkv
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#endif //MMKV_MMAPEDFILE_H
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