mirror of
https://github.com/Tencent/MMKV.git
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guoling
107 lines
2.8 KiB
C++
107 lines
2.8 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_MAMERYFILE_H
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#define MMKV_MAMERYFILE_H
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#ifdef __cplusplus
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#include "MMKVPredef.h"
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#ifdef MMKV_ANDROID
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MMKVPath_t ashmemMMKVPathWithID(const MMKVPath_t &mmapID);
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namespace mmkv {
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extern int g_android_api;
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enum FileType : bool { MMFILE_TYPE_FILE = false, MMFILE_TYPE_ASHMEM = true };
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} // namespace mmkv
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#endif // MMKV_ANDROID
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namespace mmkv {
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class MemoryFile {
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MMKVPath_t m_name;
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MMKVFileHandle_t m_fd;
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#ifdef MMKV_WIN32
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HANDLE m_fileMapping;
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#endif
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void *m_ptr;
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size_t m_size;
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bool mmap();
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void doCleanMemoryCache(bool forceClean);
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public:
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#ifndef MMKV_ANDROID
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explicit MemoryFile(const MMKVPath_t &path);
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#else
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MemoryFile(const MMKVPath_t &path, size_t size, FileType fileType);
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explicit MemoryFile(MMKVFileHandle_t ashmemFD);
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const FileType m_fileType;
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#endif // MMKV_ANDROID
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~MemoryFile() { doCleanMemoryCache(true); }
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size_t getFileSize() const { return m_size; }
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// get the actual file size on disk
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size_t getActualFileSize();
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void *getMemory() { return m_ptr; }
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const MMKVPath_t &getName() { return m_name; }
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MMKVFileHandle_t 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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// call this if clearMemoryCache() has been called
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void reloadFromFile();
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void clearMemoryCache() { doCleanMemoryCache(false); }
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#ifndef MMKV_WIN32
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bool isFileValid() { return m_fd >= 0 && m_size > 0 && m_ptr; }
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#else
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bool isFileValid() { return m_fd != INVALID_HANDLE_VALUE && m_size > 0 && m_fileMapping && m_ptr; }
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#endif
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// just forbid it for possibly misuse
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explicit MemoryFile(const MemoryFile &other) = delete;
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MemoryFile &operator=(const MemoryFile &other) = delete;
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};
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class MMBuffer;
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extern bool mkPath(const MMKVPath_t &path);
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extern bool isFileExist(const MMKVPath_t &nsFilePath);
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extern MMBuffer *readWholeFile(const MMKVPath_t &path);
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extern bool zeroFillFile(MMKVFileHandle_t fd, size_t startPos, size_t size);
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extern size_t getPageSize();
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} // namespace mmkv
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#endif
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#endif //MMKV_MAMERYFILE_H
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