cFileMemMap.h

Go to the documentation of this file.

//
//
 
#ifndef _INC_cFileMemMap_H
#define _INC_cFileMemMap_H
#ifndef NO_PRAGMA_ONCE
#pragma once
#endif
 
#include "../GrayLibBase.h"
#include "GrayCore/include/cOSHandle.h"
#include "GrayCore/include/cStreamProgress.h"
#include "GrayCore/include/FileName.h"
#if defined(__linux__)
#include <sys/mman.h>
static const int FILE_MAP_ALL_ACCESS = 0;       // _WIN32
#endif
 
namespace GrayLib
{
        class GRAYLIB_LINK cFileMemMap
        {
 
        public:
                cOSHandle m_MapFile;    
                cMemBlock m_View;               
 
        public:
                cFileMemMap() noexcept
                {
                }
                ~cFileMemMap()
                {
                        CloseMemMap();
                }
 
                HRESULT OpenView(DWORD dwDesiredAccess, STREAM_OFFSET_t nViewOffset, size_t nViewSize);
                void CloseView();
                size_t get_ViewSize() const;
 
                HRESULT OpenMemMap(const FILECHAR_t* pszName, DWORD dwDesiredAccess, size_t nViewSize, HANDLE hFile = INVALID_HANDLE_VALUE);
                void CloseMemMap()
                {
                        // Close the file as well as the view.
                        CloseView();
                        m_MapFile.CloseHandle();
                }
                HRESULT OpenMemMapV(const FILECHAR_t* pszName, DWORD dwDesiredAccess = FILE_MAP_ALL_ACCESS, size_t nViewSize = 0, HANDLE hFile = INVALID_HANDLE_VALUE)
                {
                        HRESULT hRes = OpenMemMap(pszName, dwDesiredAccess, nViewSize, hFile);
                        if (FAILED(hRes))
                                return hRes;
                        return OpenView(dwDesiredAccess, 0, nViewSize);
                }
 
                UNITTEST_FRIEND(cFileMemMap);
        };
}
#endif // _INC_cFileMemMap_H