public bool Read(long pageNumber, byte *buffer, int count) { if (_readHandle == null) { _readHandle = Win32NativeFileMethods.CreateFile(_filename, Win32NativeFileAccess.GenericRead, Win32NativeFileShare.Write | Win32NativeFileShare.Read | Win32NativeFileShare.Delete, IntPtr.Zero, Win32NativeFileCreationDisposition.OpenExisting, Win32NativeFileAttributes.Normal, IntPtr.Zero); } long position = pageNumber * AbstractPager.PageSize; var overlapped = new Overlapped((int)(position & 0xffffffff), (int)(position >> 32), IntPtr.Zero, null); NativeOverlapped *nativeOverlapped = overlapped.Pack(null, null); try { while (count > 0) { int read; if (Win32NativeFileMethods.ReadFile(_readHandle, buffer, count, out read, nativeOverlapped) == false) { int lastWin32Error = Marshal.GetLastWin32Error(); if (lastWin32Error == Win32NativeFileMethods.ErrorHandleEof) { return(false); } throw new Win32Exception(lastWin32Error); } count -= read; buffer += read; position += read; nativeOverlapped->OffsetLow = (int)(position & 0xffffffff); nativeOverlapped->OffsetHigh = (int)(position >> 32); } return(true); } finally { Overlapped.Free(nativeOverlapped); } }