private void GetRootFrnEntry()
{
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();
bool bRtn = PInvokeWin32.GetFileInformationByHandle(hRoot, out fi);
if (bRtn)
{
UInt64 fileIndexHigh = (UInt64)fi.FileIndexHigh;
UInt64 indexRoot = (fileIndexHigh << 32) | fi.FileIndexLow;
FileNameAndParentFrn f = new FileNameAndParentFrn(driveRoot, 0);
_directories.Add(indexRoot, f);
}
else
{
throw new IOException("GetFileInformationbyHandle() returned invalid handle",
new Win32Exception(Marshal.GetLastWin32Error()));
}
PInvokeWin32.CloseHandle(hRoot);
}
else
{
throw new IOException("Unable to get root frn entry", new Win32Exception(Marshal.GetLastWin32Error()));
}
}
unsafe public void EnumerateFiles(IntPtr medBuffer, ref Dictionary <ulong, FileNameAndParentFrn> files, string[] fileExtensions)
{
IntPtr pData = Marshal.AllocHGlobal(sizeof(UInt64) + 0x10000);
PInvokeWin32.ZeroMemory(pData, sizeof(UInt64) + 0x10000);
uint outBytesReturned = 0;
uint initfiles = 0;
uint totalfiles = 3000;
while (false != PInvokeWin32.DeviceIoControl(_changeJournalRootHandle, PInvokeWin32.FSCTL_ENUM_USN_DATA, medBuffer,
sizeof(PInvokeWin32.MFT_ENUM_DATA), pData, sizeof(UInt64) + 0x10000, out outBytesReturned,
IntPtr.Zero))
{
IntPtr pUsnRecord = new IntPtr(pData.ToInt32() + sizeof(Int64));
while (outBytesReturned > 60)
{
PInvokeWin32.USN_RECORD usn = new PInvokeWin32.USN_RECORD(pUsnRecord);
if (0 != (usn.FileAttributes & PInvokeWin32.FILE_ATTRIBUTE_DIRECTORY))
{
//
// handle directories
//
if (!_directories.ContainsKey(usn.FileReferenceNumber))
{
_directories.Add(usn.FileReferenceNumber,
new FileNameAndParentFrn(usn.FileName, usn.FileReferenceNumber));
}
else
{ // this is debug code and should be removed when we are certain that
// duplicate frn's don't exist on a given drive. To date, this exception has
// never been thrown. Removing this code improves performance....
throw new Exception(string.Format("Duplicate FRN: {0} for {1}",
usn.FileReferenceNumber, usn.FileName));
}
}
else
{
// if (initfiles > 3000)
// break;
//
// handle files
//
// at this point we could get the * for the extension
bool add = true;
bool fullpath = false;
if (fileExtensions != null && fileExtensions.Length != 0)
{
if (fileExtensions[0].ToString() == "*")
{
add = true;
fullpath = true;
}
else
{
add = false;
string s = Path.GetExtension(usn.FileName);
foreach (string extension in fileExtensions)
{
if (0 == string.Compare(s, extension, true))
{
add = true;
break;
}
}
}
}
if (add)
{
if (fullpath)
{
if (!files.ContainsKey(usn.FileReferenceNumber))
{
initfiles++;
files.Add(usn.FileReferenceNumber,
new FileNameAndParentFrn(usn.FileName, usn.ParentFileReferenceNumber));
}
else
{
FileNameAndParentFrn frn = files[usn.FileReferenceNumber];
if (0 != string.Compare(usn.FileName, frn.Name, true))
{
// Log.InfoFormat(
// "Attempt to add duplicate file reference number: {0} for file {1}, file from index {2}",
// usn.FileReferenceNumber, usn.FileName, frn.Name);
throw new Exception(string.Format("Duplicate FRN: {0} for {1}",
usn.FileReferenceNumber, usn.FileName));
}
}
}
else
{
if (!files.ContainsKey(usn.FileReferenceNumber))
{
initfiles++;
files.Add(usn.FileReferenceNumber,
new FileNameAndParentFrn(usn.FileName, usn.FileReferenceNumber));
}
else
{
FileNameAndParentFrn frn = files[usn.FileReferenceNumber];
if (0 != string.Compare(usn.FileName, frn.Name, true))
{
// Log.InfoFormat(
// "Attempt to add duplicate file reference number: {0} for file {1}, file from index {2}",
// usn.FileReferenceNumber, usn.FileName, frn.Name);
throw new Exception(string.Format("Duplicate FRN: {0} for {1}",
usn.FileReferenceNumber, usn.FileName));
}
}
}
}
}
pUsnRecord = new IntPtr(pUsnRecord.ToInt32() + usn.RecordLength);
outBytesReturned -= usn.RecordLength;
}
Marshal.WriteInt64(medBuffer, Marshal.ReadInt64(pData, 0));
// if (initfiles > 3000)
// break;
}
Marshal.FreeHGlobal(pData);
}
