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/*
dbx_tree: tree database driver for Miranda IM
Copyright 2007-2010 Michael "Protogenes" Kunz,
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "MappedMemory.h"
#include "Logger.h"
typedef BOOL (WINAPI *TUnmapViewOfFile)(LPCVOID);
typedef BOOL (WINAPI *TFlushViewOfFile)(LPCVOID, SIZE_T);
typedef HANDLE (WINAPI *TCreateFileMappingA)(HANDLE, LPSECURITY_ATTRIBUTES, DWORD, DWORD, DWORD, LPCSTR);
typedef LPVOID (WINAPI *TMapViewOfFile)(HANDLE, DWORD, DWORD, DWORD, SIZE_T);
HMODULE myKernelLib = NULL;
TUnmapViewOfFile myUnmapViewOfFile = NULL;
TFlushViewOfFile myFlushViewOfFile = NULL;
TCreateFileMappingA myCreateFileMappingA = NULL;
TMapViewOfFile myMapViewOfFile = NULL;
bool CMappedMemory::InitMMAP()
{
if (!myKernelLib)
myKernelLib = GetModuleHandleA("kernel32.dll"); // is always loaded
if (myKernelLib)
{
myUnmapViewOfFile = (TUnmapViewOfFile) GetProcAddress(myKernelLib, "UnmapViewOfFile");
myFlushViewOfFile = (TFlushViewOfFile) GetProcAddress(myKernelLib, "FlushViewOfFile");
myCreateFileMappingA = (TCreateFileMappingA) GetProcAddress(myKernelLib, "CreateFileMappingA");
myMapViewOfFile = (TMapViewOfFile) GetProcAddress(myKernelLib, "MapViewOfFile");
}
return myUnmapViewOfFile && myFlushViewOfFile && myCreateFileMappingA && myMapViewOfFile;
}
CMappedMemory::CMappedMemory(const TCHAR* FileName)
: CFileAccess(FileName)
{
SYSTEM_INFO sysinfo;
m_AllocSize = 0;
m_DirectFile = 0;
m_FileMapping = 0;
m_Base = NULL;
GetSystemInfo(&sysinfo);
m_AllocGranularity = sysinfo.dwAllocationGranularity; // usually 64kb
m_MinAllocGranularity = m_AllocGranularity; // must be at least one segment
m_MaxAllocGranularity = m_AllocGranularity << 4; // usually 1mb for fast increasing
m_DirectFile = CreateFile(FileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, 0);
if (m_DirectFile == INVALID_HANDLE_VALUE)
LOGSYS(logCRITICAL, _T("CreateFile failed"));
uint32_t size = GetFileSize(m_DirectFile, NULL);
size = (size + m_AllocGranularity - 1) & ~(m_AllocGranularity - 1);
if (size == 0)
size = m_AllocGranularity;
_SetSize(size);
m_AllocSize = size;
InitJournal();
}
CMappedMemory::~CMappedMemory()
{
if (m_Base)
{
myFlushViewOfFile(m_Base, NULL);
myUnmapViewOfFile(m_Base);
}
if (m_FileMapping)
CloseHandle(m_FileMapping);
if (m_DirectFile)
{
if (INVALID_SET_FILE_POINTER != SetFilePointer(m_DirectFile, m_Size, NULL, FILE_BEGIN))
SetEndOfFile(m_DirectFile);
FlushFileBuffers(m_DirectFile);
CloseHandle(m_DirectFile);
}
}
uint32_t CMappedMemory::_Read(void* Buf, uint32_t Source, uint32_t Size)
{
memcpy(Buf, m_Base + Source, Size);
return Size;
}
uint32_t CMappedMemory::_Write(void* Buf, uint32_t Dest, uint32_t Size)
{
memcpy(m_Base + Dest, Buf, Size);
return Size;
}
uint32_t CMappedMemory::_SetSize(uint32_t Size)
{
if (m_Base)
{
myFlushViewOfFile(m_Base, 0);
myUnmapViewOfFile(m_Base);
}
if (m_FileMapping)
CloseHandle(m_FileMapping);
m_Base = NULL;
m_FileMapping = NULL;
if (INVALID_SET_FILE_POINTER == SetFilePointer(m_DirectFile, Size, NULL, FILE_BEGIN))
{
LOGSYS(logERROR, _T("SetFilePointer failed"));
return 0;
}
if (!SetEndOfFile(m_DirectFile))
{
LOGSYS(logERROR, _T("Cannot set end of file"));
return 0;
}
m_FileMapping = myCreateFileMappingA(m_DirectFile, NULL, PAGE_READWRITE, 0, Size, NULL);
if (!m_FileMapping)
{
LOGSYS(logERROR, _T("CreateFileMapping failed"));
return 0;
}
m_Base = (uint8_t*) myMapViewOfFile(m_FileMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if (!m_Base)
{
LOGSYS(logERROR, _T("MapViewOfFile failed"));
return 0;
}
return Size;
}
void CMappedMemory::_Invalidate(uint32_t Dest, uint32_t Size)
{
memset(m_Base + Dest, 0, Size);
}
void CMappedMemory::_Flush()
{
myFlushViewOfFile(m_Base, NULL);
FlushFileBuffers(m_DirectFile);
}
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