public void Create(long maximumSize, long allocationDelta)
{
var creationData = new CREATE_USN_JOURNAL_DATA
{
AllocationDelta = allocationDelta,
MaximumSize = maximumSize
};
Win32DeviceControl.ControlWithInput(ChangeJournalHandle, Win32ControlCode.CreateUsnJournal, ref creationData, 0);
ReadJournalData();
}
public void Delete()
{
var deletionData = new DELETE_USN_JOURNAL_DATA
{
UsnJournalID = Data.ID,
DeleteFlags = DeletionFlag.WaitUntilDeleteCompletes,
};
Win32DeviceControl.ControlWithInput(ChangeJournalHandle, Win32ControlCode.CreateUsnJournal, ref deletionData, 0);
ReadJournalData();
}
private JournalData ReadJournalDataImpl()
{
try
{
var journalData = new USN_JOURNAL_DATA();
Win32DeviceControl.ControlWithOutput(ChangeJournalHandle, Win32ControlCode.QueryUsnJournal, ref journalData);
return(new JournalData(journalData));
}
catch (Win32Exception ex) when(ex.NativeErrorCode == (int)Win32ErrorCode.ERROR_JOURNAL_NOT_ACTIVE)
{
return(new JournalData());
}
}
private bool Read()
{
const int CurrentUSNLength = sizeof(long);
var readData = new READ_USN_JOURNAL_DATA_V0
{
StartUsn = _currentUSN,
ReasonMask = Options.ReasonFilter,
UsnJournalID = ChangeJournal.Data.ID,
ReturnOnlyOnClose = Options.ReturnOnlyOnClose ? (uint)1 : 0,
Timeout = (ulong)Options.Timeout.TotalSeconds,
};
var handle = ChangeJournal.ChangeJournalHandle;
var entryData = Win32DeviceControl.ControlWithInput(handle, Win32ControlCode.ReadUsnJournal, ref readData, BufferSize);
if (entryData.Length > CurrentUSNLength) // There are more data than just data currentUSN.
{
var bufferHandle = GCHandle.Alloc(entryData, GCHandleType.Pinned);
var bufferPointer = bufferHandle.AddrOfPinnedObject();
_currentUSN = Marshal.ReadInt64(entryData, 0);
// Enumerate entries
_entries.Clear();
var offset = CurrentUSNLength; // Skip currentUSN field
while (offset < entryData.Length)
{
var entry = GetBufferedEntry(bufferPointer, offset);
offset += entry.Length;
_entries.Add(entry);
}
bufferHandle.Free();
_currentIndex = 0;
return(true);
}
else
{
_eof = true;
return(false);
}
}