public KeyValuePair<ulong, FileNameAndFrn> GetRootFrn()
{
string driveRoot = string.Concat("\\\\.\\", Drive);
driveRoot = string.Concat(driveRoot, Path.DirectorySeparatorChar);
IntPtr hRoot = PInvokeWin32.CreateFile(driveRoot,
0,
PInvokeWin32.FILE_SHARE_READ | PInvokeWin32.FILE_SHARE_WRITE,
IntPtr.Zero,
PInvokeWin32.OPEN_EXISTING,
PInvokeWin32.FILE_FLAG_BACKUP_SEMANTICS,
IntPtr.Zero);
if (hRoot.ToInt32() != PInvokeWin32.INVALID_HANDLE_VALUE)
{
PInvokeWin32.BY_HANDLE_FILE_INFORMATION fi = new PInvokeWin32.BY_HANDLE_FILE_INFORMATION();
var bRtn = PInvokeWin32.GetFileInformationByHandle(hRoot, out fi);
if (bRtn != false)
{
UInt64 fileIndexHigh = (UInt64)fi.FileIndexHigh;
UInt64 indexRoot = (fileIndexHigh << 32) | fi.FileIndexLow;
FileNameAndFrn f = new FileNameAndFrn(driveRoot, 0);
return new KeyValuePair<ulong,FileNameAndFrn>(indexRoot,f);
}
else
{
throw new IOException("GetFileInformationbyHandle() returned invalid handle",
new Win32Exception(Marshal.GetLastWin32Error()));
}
}
else
{
throw new IOException("Unable to get root frn entry", new Win32Exception(Marshal.GetLastWin32Error()));
}
}
public static unsafe UInt64 GetPathFRN(string FilePath)
{
IntPtr hDir = PInvokeWin32.CreateFile(FilePath,
0,
PInvokeWin32.FILE_SHARE_READ,
IntPtr.Zero,
PInvokeWin32.OPEN_EXISTING,
PInvokeWin32.FILE_FLAG_BACKUP_SEMANTICS,
IntPtr.Zero
);
if(hDir.ToInt32() == PInvokeWin32.INVALID_HANDLE_VALUE)
throw new Exception();
PInvokeWin32.BY_HANDLE_FILE_INFORMATION fi = new PInvokeWin32.BY_HANDLE_FILE_INFORMATION();
PInvokeWin32.GetFileInformationByHandle(hDir, out fi);
PInvokeWin32.CloseHandle(hDir);
return (fi.FileIndexHigh << 32) | fi.FileIndexLow;
}
