/**----------------------------------------------------------------------------
\brief
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
DTSTATUS
FileIoHelper::FIOWriteToFile(
IN LARGE_INTEGER Offset,
IN DWORD Size,
IN PUCHAR Buffer
)
{
_ASSERTE(NULL != Buffer);
_ASSERTE(0 != Size);
_ASSERTE(NULL != Buffer);
if (NULL == Buffer || 0 == Size || NULL == Buffer) return DTS_INVALID_PARAMETER;
UCHAR* p = NULL;
DTSTATUS status = FIOReference(FALSE, Offset, Size, p);
if (TRUE != DT_SUCCEEDED(status))
{
return status;
}
__try
{
RtlCopyMemory(p, Buffer, Size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
status = DTS_EXCEPTION_RAISED;
}
FIOUnreference();
return status;
}
/**----------------------------------------------------------------------------
\brief
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
DTSTATUS
FileIoHelper::FIOReadFromFile(
IN LARGE_INTEGER Offset,
IN DWORD Size,
IN OUT PUCHAR Buffer
)
{
_ASSERTE(NULL != Buffer);
if (NULL == Buffer) return DTS_INVALID_PARAMETER;
UCHAR* p = NULL;
DTSTATUS status = FIOReference(TRUE, Offset, Size, p);
if (TRUE != DT_SUCCEEDED(status))
{
printf("FIOReference() failed. status=0x%08x", status);
return status;
}
__try
{
RtlCopyMemory(Buffer, p, Size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
printf("exception. code=0x%08x", GetExceptionCode());
status = DTS_EXCEPTION_RAISED;
}
FIOUnreference();
return status;
}
/**----------------------------------------------------------------------------
\brief
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
void
FileIoHelper::FIOClose(
)
{
if (TRUE != Initialized()) return;
FIOUnreference();
CloseHandle(mFileMap); mFileMap = NULL;
CloseHandle(mFileHandle); mFileHandle = INVALID_HANDLE_VALUE;
}
/**----------------------------------------------------------------------------
\brief
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
DTSTATUS
FileIoHelper::FIOReference(
IN BOOL ReadOnly,
IN LARGE_INTEGER Offset,
IN DWORD Size,
IN OUT PUCHAR& ReferencedPointer
)
{
if (TRUE != Initialized()) return DTS_INVALID_OBJECT_STATUS;
if (TRUE == IsReadOnly())
{
if (TRUE != ReadOnly)
{
printf("file handle is read-only!");
return DTS_INVALID_PARAMETER;
}
}
_ASSERTE(NULL == mFileView);
FIOUnreference();
if (Offset.QuadPart + Size > mFileSize.QuadPart)
{
printf(
"invalid offset. file size=%I64d, req offset=%I64d",
mFileSize.QuadPart, Offset.QuadPart
);
return DTS_INVALID_PARAMETER;
}
//
// MapViewOfFile() 함수의 dwFileOffsetLow 파라미터는
// SYSTEM_INFO::dwAllocationGranularity 값의 배수이어야 한다.
//
static DWORD AllocationGranularity = 0;
if (0 == AllocationGranularity)
{
SYSTEM_INFO si = { 0 };
GetSystemInfo(&si);
AllocationGranularity = si.dwAllocationGranularity;
}
DWORD AdjustMask = AllocationGranularity - 1;
LARGE_INTEGER AdjustOffset = { 0 };
AdjustOffset.HighPart = Offset.HighPart;
// AllocationGranularity 이하의 값을 버림
//
AdjustOffset.LowPart = (Offset.LowPart & ~AdjustMask);
// 버려진 값만큼 매핑할 사이즈를 증가
//
DWORD BytesToMap = (Offset.LowPart & AdjustMask) + Size;
mFileView = (PUCHAR)MapViewOfFile(
mFileMap,
(TRUE == ReadOnly) ? FILE_MAP_READ : FILE_MAP_READ | FILE_MAP_WRITE,
AdjustOffset.HighPart,
AdjustOffset.LowPart,
BytesToMap
);
if (NULL == mFileView)
{
printf(
"MapViewOfFile(high=0x%08x, log=0x%08x, bytes to map=%u) failed, gle=0x%08x",
AdjustOffset.HighPart, AdjustOffset.LowPart, BytesToMap, GetLastError()
);
return DTS_WINAPI_FAILED;
}
ReferencedPointer = &mFileView[Offset.LowPart & AdjustMask];
return DTS_SUCCESS;
}
