yyc12345
e72102496b
- move EnumsHelper into YYCC because it is widely used. - rename all calling to EnumsHelper due to this modification. - add version checker in code to make sure that user use correct YYCC library to compile. - modify some include syntax because the include directory layout changes of YYCC. - update CMake script to resolve the bug that we can not export LibCmo (thanks doyaGu and BLumia).
76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
#pragma once
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#include "../VTInternal.hpp"
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#if YYCC_OS == YYCC_OS_WINDOWS
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#include <YYCC/WinImportPrefix.hpp>
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#include <Windows.h>
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#include <YYCC/WinImportSuffix.hpp>
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#else
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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#include <string>
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namespace LibCmo::VxMath {
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/**
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* @brief Utility class for memory mapped file reading.
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* @details The VxMemoryMappedFile can be used have a mapping of a file into a memory buffer for reading purposes.
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* @remarks Due to Virtools limitation, we disallow opening any file whose size exceed the maximum value of CKDWORD.
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*/
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class VxMemoryMappedFile {
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private:
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#if YYCC_OS == YYCC_OS_WINDOWS
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HANDLE m_hFile;
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LARGE_INTEGER m_dwFileSize;
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HANDLE m_hFileMapping;
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LPVOID m_hFileMapView;
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#else
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int m_hFile;
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off_t m_offFileSize;
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void* m_pFileAddr;
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#endif
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std::u8string m_szFilePath;
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void* m_pMemoryMappedFileBase;
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CKDWORD m_cbFile;
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bool m_bIsValid;
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public:
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/**
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* @brief Create a new VxMemoryMappedFile
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* @param[in] u8_filepath The path to file to be opened. nullptr is allowed but not suggested.
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* Because it must create an invalid VxMemoryMappedFile.
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*/
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VxMemoryMappedFile(CKSTRING u8_filepath);
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~VxMemoryMappedFile();
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YYCC_DEL_CLS_COPY_MOVE(VxMemoryMappedFile);
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/**
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* @brief Returns a pointer to the mapped memory buffer.
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* @return The pointer to the mapped memory buffer for reading.
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* @remarks
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* The returned pointer should not be deleted nor should it be used for writing purpose.
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* If you did, it will cause undefined behavior.
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* @exception RuntimeException Raised when calling this on an invalid file mapping.
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*/
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const void* GetBase() const;
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/**
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* @brief Returns the file size in bytes.
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* @return The file size in bytes.
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* @exception RuntimeException Raised when calling this on an invalid file mapping.
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*/
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CKDWORD GetFileSize() const;
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/**
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* @brief Check whether this file mapping is valid to use.
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* @return True if it is, otherwise false.
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*/
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bool IsValid() const;
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};
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}
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