/// <summary><see cref="http://msdn.microsoft.com/en-us/library/windows/desktop/aa364563(v=vs.85).aspx"/></summary> public IUSN_RECORD[] FileSystemEnumUsnData() { ulong nextUsn = 0; const int chunkSize = 1 * 1024 * 1024; // 1 MB chunks List <IUSN_RECORD> res = new List <IUSN_RECORD>(); using (UnmanagedMemory mem = new UnmanagedMemory(chunkSize)) { do { MFT_ENUM_DATA_V0 input = new MFT_ENUM_DATA_V0(); input.StartFileReferenceNumber = nextUsn; input.LowUsn = long.MinValue; input.HighUsn = long.MaxValue; int errorCode; byte[] data = DeviceIoControlHelper.InvokeIoControl(Handle, IOControlCode.FsctlEnumUsnData, chunkSize, input, out errorCode); Marshal.Copy(data, 0, mem, data.Length); if (errorCode != 0) { // Exit when theres no more to do break; } nextUsn = BitConverter.ToUInt64(data, 0); int dataOffset = 8; while (dataOffset < data.Length) { int length; IUSN_RECORD rec = ParseUsnRecord(mem, dataOffset, out length); if (length <= 0) { break; } res.Add(rec); // Move to next record dataOffset += length; } // Fetch next chunk } while (true); } return(res.ToArray()); }
/// <summary><see cref="https://msdn.microsoft.com/en-us/library/windows/desktop/aa364586(v=vs.85).aspx"/></summary> public IUSN_RECORD[] FileSystemReadUsnJournal(long volumeJournalId, UsnJournalReasonMask reasonMask, USN firstUsn, int bytesToWaitFor = 0, int timeout = 0) { READ_USN_JOURNAL_DATA_V0 input = new READ_USN_JOURNAL_DATA_V0(); input.StartUsn = firstUsn; input.UsnJournalId = volumeJournalId; input.ReasonMask = reasonMask; input.BytesToWaitFor = bytesToWaitFor; input.Timeout = timeout; int errorCode; byte[] data = DeviceIoControlHelper.InvokeIoControl(Handle, IOControlCode.FsctlReadUsnJournal, 1024 * 1024, input, out errorCode); List <IUSN_RECORD> res = new List <IUSN_RECORD>(); using (UnmanagedMemory mem = new UnmanagedMemory(data)) { int dataOffset = 8; while (dataOffset < data.Length) { int length; IUSN_RECORD rec = ParseUsnRecord(mem, dataOffset, out length); if (length <= 0) { break; } res.Add(rec); // Move to next record dataOffset += length; } } return(res.ToArray()); }