/**----------------------------------------------------------------------------
\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
-----------------------------------------------------------------------------*/
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;
}
int main(){
StopWatch sw = StopWatch();
create_very_big_file(L"make.bin", 4096);
//create_very_big_file 함수 내부에서 LARGE_INTEGER 다룰때 LL 추가
sw.Start();
LARGE_INTEGER file_size_read = { 0 };
LARGE_INTEGER file_offset = { 0 };
unsigned char buf[BUF_SIZE];
FileIoHelper Fi_read= FileIoHelper();
FileIoHelper Fi_write = FileIoHelper();
Fi_read.FIOpenForRead(L"make.bin");
file_size_read.QuadPart = (1024 * 1024) * 4096LL;
Fi_write.FIOCreateFile(L"copy.bin", file_size_read);
while (DT_SUCCEEDED(Fi_read.FIOReadFromFile(file_offset, BUF_SIZE, buf))){
Fi_write.FIOWriteToFile(file_offset, BUF_SIZE, buf);
file_offset.QuadPart += BUF_SIZE;
//printf("%d", file_offset.QuadPart);
}
Fi_read.FIOClose();
Fi_write.FIOClose();
sw.Stop();
printf("using memory map via FileIoHelperClass %f , bufsize = %d \n\n", sw.GetDurationSecond(),BUF_SIZE);
sw.Start();
file_copy_using_read_write(L"make.bin", L"copy.bin2");
sw.Stop();
printf("using read write %f\n", sw.GetDurationSecond());
system("pause");
return 0;
}
/**----------------------------------------------------------------------------
\brief 파일 IO 를 위해 파일을 오픈한다.
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
DTSTATUS
FileIoHelper::FIOpenForRead(
IN std::wstring FilePath
)
{
if (TRUE == Initialized()) { FIOClose(); }
mReadOnly = TRUE;
if (TRUE != is_file_existsW(FilePath.c_str()))
{
printf(
"no file exists. file=%ws", FilePath.c_str()
);
return DTS_NO_FILE_EXIST;
}
#pragma warning(disable: 4127)
DTSTATUS status = DTS_WINAPI_FAILED;
do
{
mFileHandle = CreateFileW(
FilePath.c_str(),
GENERIC_READ,
NULL,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (INVALID_HANDLE_VALUE == mFileHandle)
{
printf(
"CreateFile(%ws) failed, gle=0x%08x",
FilePath.c_str(),
GetLastError()
);
break;
}
// check file size
//
if (TRUE != GetFileSizeEx(mFileHandle, &mFileSize))
{
printf(
"%ws, can not get file size, gle=0x%08x",
FilePath.c_str(),
GetLastError()
);
break;
}
mFileMap = CreateFileMapping(
mFileHandle,
NULL,
PAGE_READONLY,
0,
0,
NULL
);
if (NULL == mFileMap)
{
printf(
"CreateFileMapping(%ws) failed, gle=0x%08x",
FilePath.c_str(),
GetLastError()
);
break;
}
status = DTS_SUCCESS;
} while (FALSE);
#pragma warning(default: 4127)
if (TRUE != DT_SUCCEEDED(status))
{
if (INVALID_HANDLE_VALUE != mFileHandle)
{
CloseHandle(mFileHandle);
mFileHandle = INVALID_HANDLE_VALUE;
}
if (NULL != mFileMap) CloseHandle(mFileMap);
}
return status;
}
/**----------------------------------------------------------------------------
\brief FileSize 바이트 짜리 파일을 생성한다.
\param
\return
\code
\endcode
-----------------------------------------------------------------------------*/
DTSTATUS
FileIoHelper::FIOCreateFile(
IN std::wstring FilePath,
IN LARGE_INTEGER FileSize
)
{
if (TRUE == Initialized()) { FIOClose(); }
if (FileSize.QuadPart == 0) return DTS_INVALID_PARAMETER;
mReadOnly = FALSE;
#pragma warning(disable: 4127)
DTSTATUS status = DTS_WINAPI_FAILED;
do
{
mFileSize = FileSize;
mFileHandle = CreateFileW(
FilePath.c_str(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ, // write 도중 다른 프로세스에서 읽기가 가능
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (INVALID_HANDLE_VALUE == mFileHandle)
{
printf(
"CreateFile(%ws) failed, gle=0x%08x",
FilePath.c_str(),
GetLastError()
);
break;
}
// increase file size
//
if (TRUE != SetFilePointerEx(mFileHandle, mFileSize, NULL, FILE_BEGIN))
{
printf(
"SetFilePointerEx( move to %I64d ) failed, gle=0x%08x",
FileSize.QuadPart, GetLastError()
);
break;
}
if (TRUE != SetEndOfFile(mFileHandle))
{
printf("SetEndOfFile( ) failed, gle=0x%08x", GetLastError());
break;
}
mFileMap = CreateFileMapping(
mFileHandle,
NULL,
PAGE_READWRITE,
0,
0,
NULL
);
if (NULL == mFileMap)
{
printf(
"CreateFileMapping(%ws) failed, gle=0x%08x",
FilePath.c_str(),
GetLastError()
);
break;
}
status = DTS_SUCCESS;
} while (FALSE);
#pragma warning(default: 4127)
if (TRUE != DT_SUCCEEDED(status))
{
if (INVALID_HANDLE_VALUE != mFileHandle)
{
CloseHandle(mFileHandle);
mFileHandle = INVALID_HANDLE_VALUE;
}
if (NULL != mFileMap) CloseHandle(mFileMap);
}
return status;
}