System.IO.File.Open(string, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare)

private void BuildTokenInfoDictionary(string inputDirAbsolutePath, string outputDirAbsolutePath, string encoding, EncodingProvider provider)
        {
            try
            {
                ProgressLog.Begin("compiling tokeninfo dict");
                var tokenInfoCompiler = GetTokenInfoDictionaryCompiler(encoding, provider);

                ProgressLog.Println("replacedyzing dictionary features");                

                using (var stream = tokenInfoCompiler.CombinedSequentialFileInputStream(inputDirAbsolutePath))
                {
                    tokenInfoCompiler.replacedyzeTokenInfo(stream);
                    ProgressLog.Println("reading tokeninfo");
                    tokenInfoCompiler.ReadTokenInfo(stream);
                    tokenInfoCompiler.Compile(stream);
                }

                List<string> surfaces = tokenInfoCompiler.GetSurfaces();

                ProgressLog.Begin("compiling fst");

                FSTCompiler fstCompiler = new FSTCompiler(surfaces);
                using (var stream = File.Open(outputDirAbsolutePath + Path.DirectorySeparatorChar + FST.FST.FST_FILENAME, FileMode.OpenOrCreate))
                {
                    fstCompiler.Compile(stream);
                }

                ProgressLog.Println("validating saved fst");

                FST.FST fst;
                using (var stream = File.OpenRead(outputDirAbsolutePath + Path.DirectorySeparatorChar + FST.FST.FST_FILENAME))
                {
                    fst = new FST.FST(stream);
                }

                foreach (string surface in surfaces)
                {
                    if (fst.Lookup(surface) < 0)
                    {
                        ProgressLog.Println("failed to look up [" + surface + "]");
                    }
                }

                ProgressLog.End();

                ProgressLog.Begin("processing target map");

                for (int i = 0; i < surfaces.Count; i++)
                {
                    int id = fst.Lookup(surfaces[i]);
                    tokenInfoCompiler.AddMapping(id, i);
                }

                tokenInfoCompiler.Write(outputDirAbsolutePath); // TODO: Should be refactored -Christian
                ProgressLog.End();
            }
            catch (Exception ex)
            {
                throw new Exception("DictionaryCompilerBase.BuildTokenInfoDictionary: " + ex.Message);
            }
        }

public void Add(uint val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadUInt(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteUInt(stream, val);
            }
        }

public void WriteSnapshot(Snapshot sshot)
		{
			try
			{
				Debug.replacedert(sshot.EventsData.Length > 0 && sshot.EventsData.Length % 16 == 0);
				if (!string.IsNullOrEmpty(sshot.WindowUrl) && sshot.Url == null)
					TraceLogger.Instance.WriteLineInfo("Url can not be parsed: " + sshot.WindowUrl);

				long imgPos, imgLen;
				string path = Path.Combine(DataPath, sshot.SessionId + ".rdt");
				using (FileStream fs = File.Open(path, FileMode.Append, FileAccess.Write, FileShare.Read))
				{
					if (sshot.ImageData != null && sshot.ImageData.Length > 0)
					{
						imgPos = fs.Position;
						fs.Write(sshot.ImageData, 0, sshot.ImageData.Length);
						fs.Write(sshot.EventsData, 0, sshot.EventsData.Length);
						imgLen = sshot.ImageData.Length;
					}
					else
					{
						imgPos = fs.Position;
						fs.Write(sshot.EventsData, 0, sshot.EventsData.Length);
						imgLen = 0;
					}
				}

				using (Database db = new Database())
				{
					var ss = new
					{
						SessionId = sshot.SessionId,
						SnapshotId = sshot.SnapshotId,
						SnapTime = sshot.SnapTime,
						ProcessId = sshot.ProcessId,
						ProcessName = sshot.ProcessName,
						WindowHandle = sshot.WindowHandle,
						WindowRect = DataConverter.Serialize(sshot.WindowRect),

						Windowreplacedle = sshot.Windowreplacedle,
						WindowUrl = sshot.Url == null ? sshot.WindowUrl : sshot.Url.AbsoluteUri,
						UrlHost = sshot.Url == null ? null : sshot.Url.Host,

						//MouseState = DataConverter.Serialize(sshot.Mouse),
						ImagePos = imgPos,
						ImageLength = imgLen,
						IsGrayScale = sshot.IsGrayScale,

						ControlText = sshot.ControlText,
						InputText = sshot.InputText,
						EventsCount = sshot.EventsCount,
					};

					db.InsertDistinct("Snapshots", ss, new { SnapshotId = sshot.SnapshotId });
					if (!string.IsNullOrEmpty(sshot.ProcessName))
						db.InsertDistinct("ApplicationInfo", new { ProcessName = ss.ProcessName });
					if (!string.IsNullOrEmpty(ss.UrlHost))
					{
						string name = ss.UrlHost.StartsWith("www.") ? ss.UrlHost.Substring(4) : ss.UrlHost;
						name = name.EndsWith(".com") ? name.Substring(0, name.Length - 4) : name;
						db.InsertDistinct("HostInfo", new { HostUrl = ss.UrlHost, HostName = name }, new { HostUrl = ss.UrlHost });
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
		}

private async Task<long> WriteToFileInternal(string path, MemoryStream stream)
        {
            long fileSize;
            await using (FileStream streamToWriteTo = File.Open(path, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
            {
                await stream.CopyToAsync(streamToWriteTo);
                streamToWriteTo.Flush();
                fileSize = streamToWriteTo.Length;
            }

            return fileSize;
        }

public static byte[] GetBytesFromFile(string filePath, int dataLength, long offset = 0)
        {
            if (!File.Exists(filePath))
            {
                throw new FileNotFoundException($"{MessageStrings.Common_FileNotFound} {filePath}.", filePath);
            }

            if (dataLength < 1)
            {
                throw new ArgumentException($"{MessageStrings.Common_InvalidDataLengthError} ({dataLength}).", nameof(dataLength));
            }

            var dataBytes = new byte[dataLength];

            using (var fStream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                fStream.Seek(offset, SeekOrigin.Begin);
                fStream.Read(dataBytes, 0, dataLength);
                fStream.Close();
            }

            return dataBytes;
        }

[Obsolete]
		public byte[] ReadImage(string snapshotId)
		{
			byte[] bsImage = null;
			try
			{
				var sshot = Database.Invoke(db => db.SelectRow("Snapshots", new { SnapshotId = snapshotId },
					"SessionId", "WindowRect", "MouseState", "ImagePos", "ImageLength"));
				if (sshot != null)
				{
					Guid sessionId = new Guid(sshot["SessionId"].ToString());
					string path = Path.Combine(DataPath, sessionId.ToString("n") + ".rdt");
					if (File.Exists(path))
					{
						using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
						using (BinaryReader br = new BinaryReader(fs))
						{
							br.BaseStream.Seek(Convert.ToInt64(sshot["ImagePos"]), SeekOrigin.Begin);
							bsImage = br.ReadBytes(Convert.ToInt32(sshot["ImageLength"]));
						}
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return bsImage;
		}

public void Add(byte val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadByte(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteByte(stream, val);
            }
        }

private async Task<UploadResult> UploadAsync(RunnerActionPluginExecutionContext context, int uploaderId, CancellationToken token)
        {
            List<string> failedFiles = new List<string>();
            long uploadedSize = 0;
            string fileToUpload;
            Stopwatch uploadTimer = new Stopwatch();
            while (_fileUploadQueue.TryDequeue(out fileToUpload))
            {
                token.ThrowIfCancellationRequested();
                try
                {
                    using (FileStream fs = File.Open(fileToUpload, FileMode.Open, FileAccess.Read, FileShare.Read))
                    {
                        string itemPath = (_containerPath.TrimEnd('/') + "/" + fileToUpload.Remove(0, _sourceParentDirectory.Length + 1)).Replace('\\', '/');
                        bool failAndExit = false;
                        try
                        {
                            uploadTimer.Restart();
                            using (HttpResponseMessage response = await _fileContainerHttpClient.UploadFileAsync(_containerId, itemPath, fs, _projectId, cancellationToken: token, chunkSize: 4 * 1024 * 1024))
                            {
                                if (response == null || response.StatusCode != HttpStatusCode.Created)
                                {
                                    context.Output($"Unable to copy file to server StatusCode={response?.StatusCode}: {response?.ReasonPhrase}. Source file path: {fileToUpload}. Target server path: {itemPath}");

                                    if (response?.StatusCode == HttpStatusCode.Conflict)
                                    {
                                        // fail upload task but continue with any other files
                                        context.Error($"Error '{fileToUpload}' has already been uploaded.");
                                    }
                                    else if (_fileContainerHttpClient.IsFastFailResponse(response))
                                    {
                                        // Fast fail: we received an http status code where we should abandon our efforts
                                        context.Output($"Cannot continue uploading files, so draining upload queue of {_fileUploadQueue.Count} items.");
                                        DrainUploadQueue(context);
                                        failedFiles.Clear();
                                        failAndExit = true;
                                        throw new UploadFailedException($"Critical failure uploading '{fileToUpload}'");
                                    }
                                    else
                                    {
                                        context.Debug($"Adding '{fileToUpload}' to retry list.");
                                        failedFiles.Add(fileToUpload);
                                    }
                                    throw new UploadFailedException($"Http failure response '{response?.StatusCode}': '{response?.ReasonPhrase}' while uploading '{fileToUpload}'");
                                }

                                uploadTimer.Stop();
                                context.Debug($"File: '{fileToUpload}' took {uploadTimer.ElapsedMilliseconds} milliseconds to finish upload");
                                uploadedSize += fs.Length;
                                OutputLogForFile(context, fileToUpload, $"Detail upload trace for file: {itemPath}", context.Debug);
                            }
                        }
                        catch (OperationCanceledException) when (token.IsCancellationRequested)
                        {
                            context.Output($"File upload has been cancelled during upload file: '{fileToUpload}'.");
                            throw;
                        }
                        catch (Exception ex)
                        {
                            context.Output($"Fail to upload '{fileToUpload}' due to '{ex.Message}'.");
                            context.Output(ex.ToString());

                            OutputLogForFile(context, fileToUpload, $"Detail upload trace for file that fail to upload: {itemPath}", context.Output);

                            if (failAndExit)
                            {
                                context.Debug("Exiting upload.");
                                throw;
                            }
                        }
                    }

                    Interlocked.Increment(ref _uploadFilesProcessed);
                }
                catch (Exception ex)
                {
                    context.Output($"File error '{ex.Message}' when uploading file '{fileToUpload}'.");
                    throw ex;
                }
            }

            return new UploadResult(failedFiles, uploadedSize);
        }

public void Add(DateTime val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadDateTime(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteDateTime(stream, val);
            }
        }

public virtual byte[] AppendAndSave(Stream newData, string originalPath = null) {
            offset = 0;
            return AppendAndSave(newData, File.Open(originalPath ?? path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
        }

public async Task<DataElement> InsertBinaryData(string instanceId, string dataType, string contentType, string filename, Stream stream)
        {
            Application app = _applicationService.GetApplication();

            Guid dataGuid = Guid.NewGuid();
            string dataPath = GetDataPath(app.Org, app.Id.Split("/")[1], Convert.ToInt32(instanceId.Split("/")[0]), new Guid(instanceId.Split("/")[1]));

            DataElement dataElement = new DataElement() { Id = dataGuid.ToString(), DataType = dataType, ContentType = contentType, };

            if (!Directory.Exists(Path.GetDirectoryName(dataPath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(dataPath));
            }

            Directory.CreateDirectory(dataPath + @"blob");

            long filesize;

            using (Stream streamToWriteTo = File.Open(dataPath + @"blob\" + dataGuid.ToString(), FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                await stream.CopyToAsync(streamToWriteTo);
                streamToWriteTo.Flush();
                filesize = streamToWriteTo.Length;
            }

            dataElement.Size = filesize;
            string jsonData = JsonConvert.SerializeObject(dataElement);
            using StreamWriter sw = new StreamWriter(dataPath + dataGuid.ToString() + @".json");

            sw.Write(jsonData.ToString());
            sw.Close();

            return dataElement;
        }

private void ShowFileSendDialog(string fileName)
        {
            FileStream fileStream = null;
            try
            {
                fileStream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            }
            catch (Exception)
            {
                try
                {
                    // When many files hosted on OneDrive are opened, they are hardlocked
                    // and cannot be opened for reading. Copying them to tmp typically is allowed though.
                    var tempFile = TempFileUtils.GetTempFileName(fileName);
                    File.Copy(fileName, tempFile, true);
                    fileStream = File.Open(tempFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

                    // The copied file will automatically be cleaned up by the temporary storage system.
                }
                catch (Exception)
                {
                }
            }

            var dialog = new SendFileControlViewModel()
            {
                ContentStream = fileStream,
                FileName = Path.GetFileName(fileName),
                MessageContainer = this.MessageContainer,
                TypedMessageContents = this.TypedMessageContents,
                SendMessage = new AsyncRelayCommand<List<Attachment>>(this.SendContentMessageAsync, (a) => !this.IsSending),
            };

            this.SmallDialogManager.OpenPopup(dialog, Guid.Empty);
        }

private void WriteImageData(Snapshot sshot, out long imgPos, out int imgLen)
		{
			try
			{
				switch ((ImageStorageType)Global.Config.ImageStorage)
				{
					case ImageStorageType.TextOnly:
						imgPos = imgLen = 0;
						break;
					case ImageStorageType.GrayScale:
						break;
					case ImageStorageType.RawImage:
						break;
				}
				
				string path = Path.Combine(DataPath, sshot.SessionId + ".rdt");
				using (FileStream fs = File.Open(path, FileMode.Append, FileAccess.Write, FileShare.Read))
				{
					if (sshot.ImageData != null && sshot.ImageData.Length > 0)
					{
						imgPos = fs.Position;
						fs.Write(sshot.ImageData, 0, sshot.ImageData.Length);
						fs.Write(sshot.EventsData, 0, sshot.EventsData.Length);
						imgLen = sshot.ImageData.Length;
					}
					else
					{
						imgPos = fs.Position;
						fs.Write(sshot.EventsData, 0, sshot.EventsData.Length);
						imgLen = 0;
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
		}

private static RSACryptoServiceProvider createRSAFromFile (string filename)
    {
      byte[] pvk = null;
      using (var fs = File.Open (filename, FileMode.Open, FileAccess.Read, FileShare.Read)) {
        pvk = new byte[fs.Length];
        fs.Read (pvk, 0, pvk.Length);
      }

      var rsa = new RSACryptoServiceProvider ();
      rsa.ImportCspBlob (pvk);

      return rsa;
    }

protected FileStream GetStream(string path, FileMode mode, FileAccess access, FileShare share)
        {
            FileStream stream = null;
            TimeSpan interval = new TimeSpan(0, 0, 0, 0, 50);
            TimeSpan totalTime = new TimeSpan();
            while (stream == null)
            {
                try
                {
                    stream = File.Open(path, mode, access, share);
                }
                catch (IOException ex)
                {
                    Thread.Sleep(interval);
                    totalTime += interval;

                    //if we've waited too long, throw the original exception.
                    if (AccessTimeout.Ticks != 0)
                    {
                        if (totalTime > AccessTimeout)
                        {
                            throw ex;
                        }
                    }
                }
            }
            return stream;
        }

public void Add(bool val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadBool(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteBool(stream, val);
            }
        }

public static byte[] ReadImage(string snapshotId)
		{
			byte[] bsImage = null;
			try
			{
				SnapImage sshot;
				string fpath = null;
				using (Database db = new Database())
				{
					sshot = db.SelectObject<SnapImage>("SnapshotData", new { SnapshotId = snapshotId },
						"SessionId", "BackgroundId", "WindowRect", "MouseState", "IsGrayScale", "ImagePos", "ImageLen");
					if (sshot != null)
					{
						var sessionDate = db.SelectSingle<DateTime>("SessionInfo", "CreateTime", new { SessionId = sshot.SessionId });
						fpath = Path.Combine(LocalStorage.DataPath, string.Format(@"{0:yyyy}\{0:MMdd}\{1}.rdt", sessionDate, sshot.SessionId));
						TraceLogger.Instance.WriteLineInfo("Reading session file: " + fpath);
					}
				}
				if (sshot != null && File.Exists(fpath))
				{
					using (FileStream fs = File.Open(fpath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
					using (BinaryReader br = new BinaryReader(fs))
					{
						br.BaseStream.Seek(sshot.ImagePos, SeekOrigin.Begin);
						bsImage = br.ReadBytes(sshot.ImageLen);
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return bsImage;
		}

public void Add(ushort val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadUShort(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteUShort(stream, val);
            }
        }

internal static async Task CheckAsync(List<FileInfo> pkgList, int fnameWidth, int sigWidth, int csumWidth, int allCsumsWidth, CancellationToken cancellationToken)
        {
            TotalFileSize = pkgList.Sum(i => i.Length);

            var buf = new byte[1024 * 1024]; // 1 MB
            foreach (var item in pkgList)
            {
                Write($"{item.Name.Trim(fnameWidth).PadRight(fnameWidth)} ");
                try
                {
                    CurrentPadding = sigWidth;
                    CurrentFileSize = item.Length;
                    if (item.Length < 0xC0 + 0x20) // header + csum at the end
                    {
                        Write("invalid pkg".PadLeft(allCsumsWidth) + Environment.NewLine, ConsoleColor.Red);
                        continue;
                    }

                    using var file = File.Open(item.FullName, FileMode.Open, FileAccess.Read, FileShare.Read);
                    var header = new byte[0xc0];
                    file.ReadExact(header);
                    byte[] sha1Sum = null;
                    using (var sha1 = SHA1.Create())
                        sha1Sum = sha1.ComputeHash(header, 0, 0x80);
                    if (!ValidateCmac(header))
                        Write("cmac".PadLeft(sigWidth) + " ", ConsoleColor.Red);
                    else if (!ValidateHash(header, sha1Sum))
                        Write("sha1".PadLeft(sigWidth) + " ", ConsoleColor.Yellow);
                    else if (!ValidateSigNew(header, sha1Sum))
                    {
                        if (!ValidateSigOld(header, sha1Sum))
                            Write("ecdsa".PadLeft(sigWidth) + " ", ConsoleColor.Red);
                        else
                            Write("ok (old)".PadLeft(sigWidth) + " ", ConsoleColor.Yellow);
                    }
                    else
                        Write("ok".PadLeft(sigWidth) + " ", ConsoleColor.Green);

                    CurrentPadding = csumWidth;
                    file.Seek(0, SeekOrigin.Begin);
                    byte[] hash;
                    using (var sha1 = SHA1.Create())
                    {
                        var dataLengthToHash = CurrentFileSize - 0x20;
                        int read;
                        do
                        {
                            read = await file.ReadAsync(buf, 0, (int)Math.Min(buf.Length, dataLengthToHash - CurrentFileProcessedBytes), cancellationToken).ConfigureAwait(false);
                            CurrentFileProcessedBytes += read;
                            sha1.TransformBlock(buf, 0, read, null, 0);
                        } while (read > 0 && CurrentFileProcessedBytes < dataLengthToHash && !cancellationToken.IsCancellationRequested);
                        sha1.TransformFinalBlock(buf, 0, 0);
                        hash = sha1.Hash;
                    }
                    if (cancellationToken.IsCancellationRequested)
                        return;

                    var expectedHash = new byte[0x14];
                    file.ReadExact(expectedHash);
                    CurrentFileProcessedBytes += 0x20;
                    if (!expectedHash.SequenceEqual(hash))
                        Write("fail".PadLeft(csumWidth) + Environment.NewLine, ConsoleColor.Red);
                    else
                        Write("ok".PadLeft(csumWidth) + Environment.NewLine, ConsoleColor.Green);
                }
                catch (Exception e)
                {
                    Write("Error" + Environment.NewLine + e.Message + Environment.NewLine, ConsoleColor.Red);
                }
                finally
                {
                    ProcessedBytes += CurrentFileSize;
                    CurrentFileProcessedBytes = 0;
                    CurrentPadding = 0;
                }
                if (cancellationToken.IsCancellationRequested)
                    return;
            }
        }

public void Add(ulong val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadULong(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteULong(stream, val);
            }
        }

internal AesDecryptionResult DecryptWithFileStream(string encryptedFilePath, string decryptedFilePath, byte[] key, byte[] IV, CipherMode cipherMode = CipherMode.CBC,
            PaddingMode paddingMode = PaddingMode.PKCS7, bool deleteEncryptedFile = false, int kBbufferSize = 4, long startPosition = 0, long endPosition = 0)
        {
            if (!File.Exists(encryptedFilePath))
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = $"{MessageStrings.Decryption_EncryptedFileNotFound} \"{encryptedFilePath}\"."
                };
            }

            if (string.IsNullOrWhiteSpace(decryptedFilePath))
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = MessageStrings.Decryption_DecryptedFilePathError
                };
            }

            var destinationDirectory = Path.GetDirectoryName(decryptedFilePath);

            if (!Directory.Exists(destinationDirectory))
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = $"{MessageStrings.Encryption_DestinationDirectoryNotFound} \"{destinationDirectory}\"."
                };
            }

            _key = key ?? _key;
            _IV = IV ?? _IV;

            if (_key == null)
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = MessageStrings.Decryption_NullKeyError
                };
            }

            if (_IV == null)
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = MessageStrings.Decryption_NullIVError
                };
            }

            if (endPosition < startPosition)
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = string.Format(MessageStrings.Decryption_EndPositionLessThanStartError, endPosition, startPosition)
                };
            }

            var pathsEqual = decryptedFilePath.Equals(encryptedFilePath, StringComparison.InvariantCultureIgnoreCase);

            try
            {
                using (var aesManaged = new AesManaged())
                {
                    aesManaged.Key = _key;
                    aesManaged.IV = _IV;
                    aesManaged.Mode = cipherMode;
                    aesManaged.Padding = paddingMode;

                    using (var decryptedFs = File.Open((pathsEqual ? decryptedFilePath + "_tmpdecrypt" : decryptedFilePath), FileMode.Create, FileAccess.Write, FileShare.None))
                    {
                        using (var encryptedFs = File.Open(encryptedFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                        {
                            encryptedFs.Position = startPosition;

                            using (var decryptor = aesManaged.CreateDecryptor(_key, _IV))
                            {
                                using (var cs = new CryptoStream(decryptedFs, decryptor, CryptoStreamMode.Write))
                                {
                                    //encrypted.CopyTo(cs);

                                    var buffer = new byte[kBbufferSize * 1024];
                                    var totalBytesToRead = ((endPosition == 0 ? encryptedFs.Length : endPosition) - startPosition);
                                    var totalBytesNotRead = totalBytesToRead;
                                    long totalBytesRead = 0;
                                    var percentageDone = 0;

                                    while (totalBytesNotRead > 0)
                                    {
                                        var bytesRead = encryptedFs.Read(buffer, 0, (int)Math.Min(buffer.Length, totalBytesNotRead));

                                        if (bytesRead > 0)
                                        {
                                            cs.Write(buffer, 0, bytesRead);

                                            totalBytesRead += bytesRead;
                                            totalBytesNotRead -= bytesRead;
                                            var tmpPercentageDone = (int)(totalBytesRead * 100 / totalBytesToRead);

                                            if (tmpPercentageDone != percentageDone)
                                            {
                                                percentageDone = tmpPercentageDone;

                                                RaiseOnDecryptionProgress(percentageDone, (percentageDone != 100 ? $"Decrypting ({percentageDone}%)..." : $"Decrypted ({percentageDone}%)."));
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                if (pathsEqual)
                {
                    CommonMethods.ClearFileAttributes(encryptedFilePath); // set "Normal" FileAttributes to avoid erros while trying to delete the file below
                    File.Delete(encryptedFilePath);
                    File.Move(decryptedFilePath + "_tmpdecrypt", decryptedFilePath);
                }

                if (deleteEncryptedFile && !pathsEqual)
                {
                    CommonMethods.ClearFileAttributes(encryptedFilePath); // set "Normal" FileAttributes to avoid erros while trying to delete the file below
                    File.Delete(encryptedFilePath);
                }

                var message = string.Format(MessageStrings.Decryption_FileDecryptSuccess, encryptedFilePath, decryptedFilePath);
                message += (deleteEncryptedFile && !pathsEqual ? $"\n{string.Format(MessageStrings.Encryption_FileDeleted, encryptedFilePath)}" : "");

                return new AesDecryptionResult()
                {
                    Success = true,
                    Message = message,
                    Key = _key,
                    IV = _IV,
                    AesCipherMode = (AesCipherMode)cipherMode,
                    PaddingMode = paddingMode
                };
            }
            catch (Exception ex)
            {
                return new AesDecryptionResult()
                {
                    Success = false,
                    Message = $"{MessageStrings.Decryption_ExceptionError}\n{ex.ToString()}"
                };
            }
        }

public static void AppendDataBytesToFile(string filePath, byte[] dataBytes)
        {
            using (var fs = File.Open(filePath, FileMode.Append, FileAccess.Write, FileShare.None))
            {
                fs.Write(dataBytes, 0, dataBytes.Length);
            }
        }

private string GetLastLine()
        {
            var reader = new StreamReader(File.Open(_appender.CurrentFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
            string written = null;

            while (!reader.EndOfStream)
            {
                written = reader.ReadLine();
            }

            return written;
        }

void ILogger.Log(LogLevel level, string log)
            {
                var logFilePath = Path.Combine(AppContext.BaseDirectory, "debug.log");
                using var logFileStream = File.Open(logFilePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
                using var logWriter = new StreamWriter(logFileStream);
                logWriter.Write(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
                logWriter.Write(": [");
                logWriter.Write(level);
                logWriter.Write("] ");
                logWriter.WriteLine(log);
                logWriter.Flush();
            }

private async void AllowGameOpen_Click(object sender, RoutedEventArgs e) {
            ggpkContainer.fileStream.Close();
            var fi = new FileInfo(FilePath);
            var t = fi.LastWriteTimeUtc;
            var l = fi.Length;
        loop:
			try {
                MessageBox.Show(this, "GGPK file is now closed, you can open the game!\nClose the game and click OK to reopen the GGPK file and return to VisualGGPK2", "Released File Handle", MessageBoxButton.OK, MessageBoxImage.Information);
                fi = new FileInfo(FilePath);
                if (fi.LastWriteTimeUtc != t || fi.Length != l) {
                    MessageBox.Show(this, "The Content.ggpk has been modified, Now it's going to be reloaded", "GGPK Changed", MessageBoxButton.OK, MessageBoxImage.Warning);

                    Tree.Items.Clear();
                    TextView.Text = "Loading . . .";
                    TextView.Visibility = Visibility.Visible;
                    FilterButton.IsEnabled = false;
                    AllowGameOpen.IsEnabled = false;

                    // Initial GGPK
                    await Task.Run(() => ggpkContainer = new GGPKContainer(FilePath, BundleMode, SteamMode));

                    var root = CreateNode(ggpkContainer.rootDirectory);
                    Tree.Items.Add(root); // Initial TreeView
                    root.IsExpanded = true;

                    FilterButton.IsEnabled = true;
                    if (!SteamMode)
                        AllowGameOpen.IsEnabled = true;

                    TextView.AppendText("\r\n\r\nDone!\r\n");
                } else {
                    ggpkContainer.fileStream = File.Open(FilePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
                    ggpkContainer.Reader = new(ggpkContainer.fileStream);
                    ggpkContainer.Writer = new(ggpkContainer.fileStream);
                }
            } catch (IOException) {
                MessageBox.Show(this, "Cannot access the file, make sure you have closed the game!", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                goto loop;
            }
        }

public async Task<DataElement> InsertBinaryData(string org, string app, int instanceOwnerId, Guid instanceGuid, string dataType, HttpRequest request)
        {
            Guid dataGuid = Guid.NewGuid();
            string dataPath = GetDataPath(org, app, instanceOwnerId, instanceGuid);
            Instance instance = GetTestInstance(app, org, instanceOwnerId, instanceGuid);
            DataElement dataElement = new DataElement() { Id = dataGuid.ToString(), DataType = dataType, ContentType = request.ContentType };

            if (!Directory.Exists(Path.GetDirectoryName(dataPath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(dataPath));
            }

            Directory.CreateDirectory(dataPath + @"blob");

            long filesize;

            using (Stream streamToWriteTo = File.Open(dataPath + @"blob\" + dataGuid.ToString(), FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                await request.Body.CopyToAsync(streamToWriteTo);
                streamToWriteTo.Flush();
                filesize = streamToWriteTo.Length;
                streamToWriteTo.Close();
            }

            dataElement.Size = filesize;
            string jsonData = JsonConvert.SerializeObject(dataElement);
            using StreamWriter sw = new StreamWriter(dataPath + dataGuid.ToString() + @".json");

            sw.Write(jsonData.ToString());
            sw.Close();

            return dataElement;
        }

private void ShowFileSendDialog(string fileName)
        {
            FileStream fileStream = null;
            try
            {
                fileStream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            }
            catch (Exception)
            {
                try
                {
                    // When many files hosted on OneDrive are opened, they are hardlocked
                    // and cannot be opened for reading. Copying them to tmp typically is allowed though.
                    var tempFile = TempFileUtils.GetTempFileName(fileName);
                    File.Copy(fileName, tempFile, true);
                    fileStream = File.Open(tempFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

                    // The copied file will automatically be cleaned up by the temporary storage system.
                }
                catch (Exception)
                {
                }
            }

            var dialog = new SendFileControlViewModel()
            {
                ContentStream = fileStream,
                FileName = Path.GetFileName(fileName),
                MessageContainer = this.MessageContainer,
                TypedMessageContents = this.TypedMessageContents,
                SendMessage = new AsyncRelayCommand<List<Attachment>>(this.SendContentMessageAsync, (a) => !this.IsSending),
            };

            this.SmallDialogManager.OpenPopup(dialog, Guid.Empty);
        }

private static SnapImage LoadSnapshot(string snapshotId, Database db)
		{
			SnapImage snap = null;
			try
			{
				var sshot = db.SelectObject<SnapImage>("SnapshotData", new { SnapshotId = snapshotId },
					"SessionId", "SnapshotId", "BackgroundId", "ScreenWidth", "ScreenHeight", "MouseState", "IsGrayScale", "ImagePos", "ImageLen");
				if (sshot != null)
				{
					var sessionDate = db.SelectSingle<DateTime>("SessionInfo", "CreateTime", new { SessionId = sshot.SessionId });
					string fpath = Path.Combine(LocalStorage.DataPath, string.Format(@"{0:yyyy}\{0:MMdd}\{1}.rdt", sessionDate, sshot.SessionId));

					using (FileStream fs = File.Open(fpath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
					using (BinaryReader br = new BinaryReader(fs))
					{
						br.BaseStream.Seek(sshot.ImagePos, SeekOrigin.Begin);
						byte[] bsData = br.ReadBytes(sshot.ImageLen);

						snap = sshot;
						snap.ImageData = bsData;
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return snap;
		}

private async Task<Response<BlobContentInfo>> WriteStreamToTestDataFolder(string filepath, Stream fileStream)
        {
            string dataPath = GetDataBlobPath() + filepath;

            if (!Directory.Exists(Path.GetDirectoryName(dataPath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(dataPath));
            }

            int filesize;

            using (Stream streamToWriteTo = File.Open(dataPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                await fileStream.CopyToAsync(streamToWriteTo);
                streamToWriteTo.Flush();
                filesize = (int)streamToWriteTo.Length;
            }

            BlobContentInfo mockedBlobInfo = BlobsModelFactory.BlobContentInfo(new ETag("ETagSuccess"), DateTime.Now, new byte[1], DateTime.Now.ToUniversalTime().ToString(), "encryptionKeySha256", "encryptionScope", 1);
            Mock<Response<BlobContentInfo>> mockResponse = new Mock<Response<BlobContentInfo>>();
            mockResponse.SetupGet(r => r.Value).Returns(mockedBlobInfo);

            Mock<Response> responseMock = new Mock<Response>();
            responseMock.SetupGet(r => r.Status).Returns((int)HttpStatusCode.Created);
            mockResponse.Setup(r => r.GetRawResponse()).Returns(responseMock.Object);

            return mockResponse.Object;
        }

private FileStream GetCleaningLock()
        {
            try
            {
                return File.Open(Path.Combine(CacheDir, SemapreplacedFile), FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
            }
            catch (Exception)
            {
                return null;
            }
        }

public override void OnActivate()
        {
            base.OnActivate();

            // Setup self-update.
            var selfUpdate = new BackgroundWorker() { WorkerReportsProgress = true };
            selfUpdate.DoWork += (object sender, DoWorkEventArgs e) =>
            {
                selfUpdate.ReportProgress(0);
                var random = new Random();
                var tempFolder = Path.GetTempPath();
                var workingFolder = tempFolder + Path.GetRandomFileName() + "\\";
                Directory.CreateDirectory(workingFolder);
                try
                {
                    string installerFilename = null;
                    FileStream installerFile = null;

                    // Download installer.
                    while (DownloadUris.Count > 0)
                    {
                        Window.Abort.Token.ThrowIfCancellationRequested();
                        var uriIndex = random.Next(DownloadUris.Count);
                        try
                        {
                            var binaryUri = DownloadUris[uriIndex];
                            Trace.TraceInformation("Downloading installer file from {0}...", binaryUri.AbsoluteUri);
                            var request = WebRequest.Create(binaryUri);
                            request.Proxy = null;
                            using (var response = request.GetResponse())
                            {
                                // 1. Get installer filename from Content-Disposition header.
                                // 2. Get installer filename from the last segment of URI path.
                                // 3. Fallback to a predefined installer filename.
                                try { installerFilename = Path.GetFullPath(workingFolder + new ContentDisposition(request.Headers["Content-Disposition"]).FileName); }
                                catch
                                {
                                    try { installerFilename = Path.GetFullPath(workingFolder + binaryUri.Segments[binaryUri.Segments.Length - 1]); }
                                    catch { installerFilename = Path.GetFullPath(workingFolder + Properties.Settings.Default.Clientreplacedle + " Client Setup.exe"); }
                                }

                                // Save response data to file.
                                installerFile = File.Open(installerFilename, FileMode.CreateNew, FileAccess.Write, FileShare.Read | FileShare.Inheritable);
                                try
                                {
                                    using (var stream = response.GetResponseStream())
                                    {
                                        installerFile.Seek(0, SeekOrigin.Begin);
                                        var hash = new eduEd25519.SHA256();
                                        var buffer = new byte[1048576];
                                        long offset = 0, total = response.ContentLength;

                                        for (; ; )
                                        {
                                            // Wait for the data to arrive.
                                            Window.Abort.Token.ThrowIfCancellationRequested();
                                            var bufferLength = stream.Read(buffer, 0, buffer.Length);
                                            if (bufferLength == 0)
                                                break;
                                            //Window.Abort.Token.WaitHandle.WaitOne(100); // Mock a slow link for testing.

                                            // Append it to the file and hash it.
                                            Window.Abort.Token.ThrowIfCancellationRequested();
                                            installerFile.Write(buffer, 0, bufferLength);
                                            hash.TransformBlock(buffer, 0, bufferLength, buffer, 0);

                                            // Report progress.
                                            offset += bufferLength;
                                            selfUpdate.ReportProgress((int)(offset * 100 / total));
                                        }

                                        hash.TransformFinalBlock(buffer, 0, 0);
                                        if (!hash.Hash.SequenceEqual(Hash))
                                            throw new DownloadedFileCorruptException(string.Format(Resources.Strings.ErrorDownloadedFileCorrupt, binaryUri.AbsoluteUri));

                                        installerFile.SetLength(installerFile.Position);
                                        break;
                                    }
                                }
                                catch
                                {
                                    // Close installer file.
                                    installerFile.Close();
                                    installerFile = null;

                                    // Delete installer file. If possible.
                                    Trace.TraceInformation("Deleting file {0}...", installerFilename);
                                    try { File.Delete(installerFilename); }
                                    catch (Exception ex2) { Trace.TraceWarning("Deleting {0} file failed: {1}", installerFilename, ex2.ToString()); }
                                    installerFilename = null;

                                    throw;
                                }
                            }
                        }
                        catch (OperationCanceledException) { throw; }
                        catch (Exception ex)
                        {
                            Trace.TraceWarning("Error: {0}", ex.ToString());
                            DownloadUris.RemoveAt(uriIndex);
                        }
                    }

                    if (installerFilename == null || installerFile == null)
                    {
                        // The installer file is not ready.
                        throw new InstallerFileUnavailableException();
                    }

                    try
                    {
                        var updaterFilename = Path.GetFullPath(workingFolder + Properties.Settings.Default.Clientreplacedle + " Client Setup and Relaunch.wsf");
                        var updaterFile = File.Open(updaterFilename, FileMode.CreateNew, FileAccess.Write, FileShare.Read | FileShare.Inheritable);
                        try
                        {
                            // Prepare WSF file.
                            var writer = new XmlTextWriter(updaterFile, null);
                            writer.WriteStartDoreplacedent();
                            writer.WriteStartElement("package");
                            writer.WriteStartElement("job");

                            writer.WriteStartElement("reference");
                            writer.WriteAttributeString("object", "WScript.Shell");
                            writer.WriteEndElement(); // reference

                            writer.WriteStartElement("reference");
                            writer.WriteAttributeString("object", "Scripting.FileSystemObject");
                            writer.WriteEndElement(); // reference

                            writer.WriteStartElement("script");
                            writer.WriteAttributeString("language", "JScript");
                            var installerArgumentsEsc = string.IsNullOrEmpty(Arguments) ? "" : " " + HttpUtility.JavaScriptStringEncode(Arguments);
                            var argv = Environment.GetCommandLineArgs();
                            var arguments = new StringBuilder();
                            for (long i = 1, n = argv.LongLength; i < n; i++)
                            {
                                if (i > 1) arguments.Append(" ");
                                arguments.Append("\"");
                                arguments.Append(argv[i].Replace("\"", "\"\""));
                                arguments.Append("\"");
                            }
                            var script = new StringBuilder();
                            script.AppendLine("var wsh = WScript.CreateObject(\"WScript.Shell\");");
                            script.AppendLine("wsh.Run(\"\\\"" + HttpUtility.JavaScriptStringEncode(installerFilename.Replace("\"", "\"\"")) + "\\\"" + installerArgumentsEsc + "\", 0, true);");
                            script.AppendLine("var fso = WScript.CreateObject(\"Scripting.FileSystemObject\");");
                            script.AppendLine("try { fso.DeleteFile(\"" + HttpUtility.JavaScriptStringEncode(installerFilename) + "\", true); } catch (err) {}");
                            script.AppendLine("try { fso.DeleteFile(\"" + HttpUtility.JavaScriptStringEncode(updaterFilename) + "\", true); } catch (err) {}");
                            script.AppendLine("try { fso.DeleteFolder(\"" + HttpUtility.JavaScriptStringEncode(workingFolder.TrimEnd(Path.DirectorySeparatorChar)) + "\", true); } catch (err) {}");
                            writer.WriteCData(script.ToString());
                            writer.WriteEndElement(); // script

                            writer.WriteEndElement(); // job
                            writer.WriteEndElement(); // package
                            writer.WriteEndDoreplacedent();
                            writer.Flush();

                            // Prepare WSF launch parameters.
                            Trace.TraceInformation("Launching update script file {0}...", updaterFilename);
                            var process = new Process();
                            process.StartInfo.FileName = "wscript.exe";
                            process.StartInfo.Arguments = "\"" + updaterFilename + "\"";
                            process.StartInfo.WorkingDirectory = workingFolder;

                            // Close WSF and installer files as late as possible to narrow the attack window.
                            // If Windows supported executing files that are locked for writing, we could leave those files open.
                            updaterFile.Close();
                            installerFile.Close();
                            process.Start();
                        }
                        catch
                        {
                            // Close WSF file.
                            updaterFile.Close();

                            // Delete WSF file. If possible.
                            Trace.TraceInformation("Deleting file {0}...", updaterFilename);
                            try { File.Delete(updaterFilename); }
                            catch (Exception ex2) { Trace.TraceWarning("Deleting {0} file failed: {1}", updaterFilename, ex2.ToString()); }

                            throw;
                        }
                    }
                    catch
                    {
                        // Close installer file.
                        installerFile.Close();

                        // Delete installer file. If possible.
                        Trace.TraceInformation("Deleting file {0}...", installerFilename);
                        try { File.Delete(installerFilename); }
                        catch (Exception ex2) { Trace.TraceWarning("Deleting {0} file failed: {1}", installerFilename, ex2.ToString()); }

                        throw;
                    }
                }
                catch
                {
                    // Delete working folder. If possible.
                    try { Directory.Delete(workingFolder); }
                    catch (Exception ex2) { Trace.TraceWarning("Deleting {0} folder failed: {1}", workingFolder, ex2.ToString()); }

                    throw;
                }
            };

            // Self-update progress.
            selfUpdate.ProgressChanged += (object sender, ProgressChangedEventArgs e) =>
            {
                Progress.Value = e.ProgressPercentage;
            };

            // Self-update complereplacedion.
            selfUpdate.RunWorkerCompleted += (object sender, RunWorkerCompletedEventArgs e) =>
            {
                if (e.Error == null)
                {
                    // Self-updating successfuly launched. Quit to release open files.
                    Wizard.OnQuitApplication(this);
                }
                else
                    Wizard.Error = e.Error;

                // Self-dispose.
                (sender as BackgroundWorker)?.Dispose();
            };

            selfUpdate.RunWorkerAsync();
        }

public long WriteImageData(string sessionId, byte[] imgData, byte[] addData)
		{
			Debug.replacedert(sessionId != null && imgData != null && imgData.Length > 0);
			long pos;
			try
			{
				string path = Path.Combine(DataPath, sessionId + ".rdm");
				using (FileStream fs = File.Open(path, FileMode.Append, FileAccess.Write, FileShare.Read))
				{
					pos = fs.Position;
					fs.Write(imgData, 0, imgData.Length);
					fs.Write(addData, 0, addData.Length);
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return pos;
		}

public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            // If we should not log...
            if (!IsEnabled(logLevel))
                // Return
                return;

            // Get current time
            var currentTime = DateTimeOffset.Now.ToString("yyyy-MM-dd hh:mm:ss");

            // Prepend log level
            var logLevelString = mConfiguration.OutputLogLevel ? $"{logLevel.ToString().ToUpper()}: " : "";

            // Prepend the time to the log if desired
            var timeLogString = mConfiguration.LogTime ? $"[{currentTime}] " : "";

            // Get the formatted message string
            var message = formatter(state, exception);

            // Write the message
            var output = $"{logLevelString}{timeLogString}{message}{Environment.NewLine}";

            // Normalize path
            // TODO: Make use of configuration base path
            var normalizedPath = mFilePath.ToUpper();

            var fileLock = default(object);

            // Double safety even though the FileLocks should be thread safe
            lock (FileLockLock)
            {
                // Get the file lock based on the absolute path
                fileLock = FileLocks.GetOrAdd(normalizedPath, path => new object());
            }

            // Lock the file
            lock (fileLock)
            {
                // Ensure folder
                if (!Directory.Exists(mDirectory))
                    Directory.CreateDirectory(mDirectory);

                // Open the file
                using (var fileStream = new StreamWriter(File.Open(mFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite)))
                {
                    // Go to end
                    fileStream.BaseStream.Seek(0, SeekOrigin.End);

                    // NOTE: Ignore logToTop in configuration as not efficient for files on OS

                    // Write the message to the file
                    fileStream.Write(output);
                }
            }
        }

public async Task DumpAsync(string output)
        {
            // check and create output folder
            var dumpPath = output;
            while (!string.IsNullOrEmpty(dumpPath) && !Directory.Exists(dumpPath))
            {
                var parent = Path.GetDirectoryName(dumpPath);
                if (parent == null || parent == dumpPath)
                    dumpPath = null;
                else
                    dumpPath = parent;
            }
            if (filesystemStructure is null)
                (filesystemStructure, emptyDirStructure) = GetFilesystemStructure();
            var validators = GetValidationInfo();
            if (!string.IsNullOrEmpty(dumpPath))
            {
                var root = Path.GetPathRoot(Path.GetFullPath(output));
                var drive = DriveInfo.GetDrives().FirstOrDefault(d => d?.RootDirectory.FullName.StartsWith(root) ?? false);
                if (drive != null)
                {
                    var spaceAvailable = drive.AvailableFreeSpace;
                    TotalFileSize = filesystemStructure.Sum(f => f.Length);
                    var diff = TotalFileSize + 100 * 1024 - spaceAvailable;
                    if (diff > 0)
                        Log.Warn($"Target drive might require {diff.replacedtorageUnit()} of additional free space");
                }
            }

            foreach (var dir in emptyDirStructure)
                Log.Trace($"Empty dir: {dir}");
            foreach (var file in filesystemStructure)
                Log.Trace($"0x{file.StartSector:x8}: {file.Filename} ({file.Length})");
            var outputPathBase = Path.Combine(output, OutputDir);
            if (!Directory.Exists(outputPathBase))
                Directory.CreateDirectory(outputPathBase);

            TotalFileCount = filesystemStructure.Count;
            TotalSectors = discReader.TotalClusters;
            Log.Debug("Using decryption key: " + allMatchingKeys.First().DecryptedKeyId);
            var decryptionKey = allMatchingKeys.First().DecryptedKey;
            var sectorSize = (int)discReader.ClusterSize;
            var unprotectedRegions = driveStream.GetUnprotectedRegions();
            ValidationStatus = true;

            foreach (var dir in emptyDirStructure)
            {
                try
                {
                    if (Cts.IsCancellationRequested)
                        return;

                    var convertedName = Path.DirectorySeparatorChar == '\\' ? dir : dir.Replace('\\', Path.DirectorySeparatorChar);
                    var outputName = Path.Combine(outputPathBase, convertedName);
                    if (!Directory.Exists(outputName))
                    {
                        Log.Debug("Creating empty directory " + outputName);
                        Directory.CreateDirectory(outputName);
                    }
                }
                catch (Exception ex)
                {
                    Log.Error(ex);
                    BrokenFiles.Add((dir, "Unexpected error: " + ex.Message));
                }
            }
            
            foreach (var file in filesystemStructure)
            {
                try
                {
                    if (Cts.IsCancellationRequested)
                        return;

                    Log.Info($"Reading {file.Filename} ({file.Length.replacedtorageUnit()})");
                    CurrentFileNumber++;
                    var convertedFilename = Path.DirectorySeparatorChar == '\\' ? file.Filename : file.Filename.Replace('\\', Path.DirectorySeparatorChar);
                    var inputFilename = Path.Combine(input, convertedFilename);

                    if (!File.Exists(inputFilename))
                    {
                        Log.Error($"Missing {file.Filename}");
                        BrokenFiles.Add((file.Filename, "missing"));
                        continue;
                    }

                    var outputFilename = Path.Combine(outputPathBase, convertedFilename);
                    var fileDir = Path.GetDirectoryName(outputFilename);
                    if (!Directory.Exists(fileDir))
                    {
                        Log.Debug("Creating directory " + fileDir);
                        Directory.CreateDirectory(fileDir);
                    }

                    var error = false;
                    var expectedHashes = (
                        from v in validators
                        where v.Files.ContainsKey(file.Filename)
                        select v.Files[file.Filename].Hashes
                    ).ToList();
                    var lastHash = "";
                    var tries = 2;
                    do
                    {
                        try
                        {
                            tries--;
                            using var outputStream = File.Open(outputFilename, FileMode.Create, FileAccess.Write, FileShare.Read);
                            using var inputStream = File.Open(inputFilename, FileMode.Open, FileAccess.Read, FileShare.Read);
                            using var decrypter = new Decrypter(inputStream, driveStream, decryptionKey, file.StartSector, sectorSize, unprotectedRegions);
                            Decrypter = decrypter;
                            await decrypter.CopyToAsync(outputStream, 8 * 1024 * 1024, Cts.Token).ConfigureAwait(false);
                            outputStream.Flush();
                            var resultHashes = decrypter.GetHashes();
                            var resultMd5 = resultHashes["MD5"];
                            if (decrypter.WasEncrypted && decrypter.WasUnprotected)
                                Log.Debug("Partially decrypted " + file.Filename);
                            else if (decrypter.WasEncrypted)
                                Log.Debug("Decrypted " + file.Filename);

                            if (!expectedHashes.Any())
                            {
                                if (ValidationStatus == true)
                                    ValidationStatus = null;
                            }
                            else if (!IsMatch(resultHashes, expectedHashes))
                            {
                                error = true;
                                var msg = "Unexpected hash: " + resultMd5;
                                if (resultMd5 == lastHash || decrypter.LastBlockCorrupted)
                                {
                                    Log.Error(msg);
                                    BrokenFiles.Add((file.Filename, "corrupted"));
                                    break;
                                }
                                Log.Warn(msg + ", retrying");
                            }

                            lastHash = resultMd5;
                        }
                        catch (Exception e)
                        {
                            Log.Error(e, e.Message);
                            error = true;
                        }
                    } while (error && tries > 0 && !Cts.IsCancellationRequested);
                }
                catch (Exception ex)
                {
                    Log.Error(ex);
                    BrokenFiles.Add((file.Filename, "Unexpected error: " + ex.Message));
                }
            }
            Log.Info("Completed");
        }

private void Open(string pathfilename)
		{
			FileAccess access;
			FileShare share;
			
			// Determine if opening for read only
			if(isreadonly)
			{
				// Read only
				access = FileAccess.Read;
				share = FileShare.ReadWrite;
			}
			else
			{
				// Private access
				access = FileAccess.ReadWrite;
				share = FileShare.Read;
			}
			
			// Keep filename
			filename = pathfilename;
			
			// Open the file stream
			file = File.Open(pathfilename, FileMode.OpenOrCreate, access, share);

			// Create file handling tools
			reader = new BinaryReader(file, ENCODING);
			if(!isreadonly) writer = new BinaryWriter(file, ENCODING);

			// Is the WAD file zero length?
			if(file.Length == 0)
			{
				// Create the headers in file
				CreateHeaders();
			}
			else
			{
				// Read information from file
				ReadHeaders();
			}
		}

private Image LoadImage(SnapImage sshot)
		{
			byte[] bsImage = null;
			string path = Path.Combine(DataPath, sshot.SessionId + ".rdt");
			if (File.Exists(path))
			{
				using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
				using (BinaryReader br = new BinaryReader(fs))
				{
					br.BaseStream.Seek(sshot.ImagePos, SeekOrigin.Begin);
					bsImage = br.ReadBytes(sshot.ImageLength);
				}
			}

			Image img = null;
			if (bsImage != null && bsImage.Length > 0)
			{
				using (MemoryStream ms = new MemoryStream(bsImage))
					img = Image.FromStream(ms);
			}
			return img;
		}

public void Add(sbyte val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadSByte(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteSByte(stream, val);
            }
        }

private async Task UploadFile(UploadFileInfo file)
        {
            bool uploadSucceed = false;
            try
            {
                if (String.Equals(file.Type, CoreAttachmentType.Log, StringComparison.OrdinalIgnoreCase))
                {
                    // Create the log
                    var taskLog = await _jobServer.CreateLogAsync(_scopeIdentifier, _hubName, _planId, new TaskLog(String.Format(@"logs\{0:D}", file.TimelineRecordId)), default(CancellationToken));

                    // Upload the contents
                    using (FileStream fs = File.Open(file.Path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                    {
                        var logUploaded = await _jobServer.AppendLogContentAsync(_scopeIdentifier, _hubName, _planId, taskLog.Id, fs, default(CancellationToken));
                    }

                    // Create a new record and only set the Log field
                    var attachmentUpdataRecord = new TimelineRecord() { Id = file.TimelineRecordId, Log = taskLog };
                    QueueTimelineRecordUpdate(file.TimelineId, attachmentUpdataRecord);
                }
                else
                {
                    // Create attachment
                    using (FileStream fs = File.Open(file.Path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                    {
                        var result = await _jobServer.CreateAttachmentAsync(_scopeIdentifier, _hubName, _planId, file.TimelineId, file.TimelineRecordId, file.Type, file.Name, fs, default(CancellationToken));
                    }
                }

                uploadSucceed = true;
            }
            finally
            {
                if (uploadSucceed && file.DeleteSource)
                {
                    try
                    {
                        File.Delete(file.Path);
                    }
                    catch (Exception ex)
                    {
                        Trace.Info("Catch exception during delete success uploaded file.");
                        Trace.Error(ex);
                    }
                }
            }
        }

public void Add(short val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadShort(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteShort(stream, val);
            }
        }

public byte[] ReadImageData(string snapshotId)
		{
			byte[] bsImage = null;
			try
			{
				var sshot = Database.Invoke(db => db.SelectRow("Snapshots", new { SnapshotId = snapshotId },
					"SessionId", "WindowRect", "MouseState", "ImagePos", "ImageLength"));
				if (sshot != null)
				{
					Guid sessionId = new Guid(sshot["SessionId"].ToString());
					string path = Path.Combine(DataPath, sessionId.ToString("n") + ".rdm");
					if (File.Exists(path))
					{
						using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
						using (BinaryReader br = new BinaryReader(fs))
						{
							br.BaseStream.Seek(Convert.ToInt64(sshot["ImagePos"]), SeekOrigin.Begin);
							bsImage = br.ReadBytes(Convert.ToInt32(sshot["ImageLength"]));
						}
					}
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return bsImage;
		}

public void Add(int val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadInt(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteInt(stream, val);
            }
        }

public void DetectDisc(string inDir = "", Func<Dumper, string> outputDirFormatter = null)
        {
            outputDirFormatter ??= d => $"[{d.ProductCode}] {d.replacedle}";
            string discSfbPath = null;
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                var drives = DriveInfo.GetDrives().Where(d => d.DriveType == DriveType.CDRom && d.IsReady);
                if (string.IsNullOrEmpty(inDir))
                {
                    foreach (var drive in drives)
                    {
                        discSfbPath = Path.Combine(drive.Name, "PS3_DISC.SFB");
                        if (!File.Exists(discSfbPath))
                            continue;

                        input = drive.Name;
                        Drive = drive.Name[0];
                        break;
                    }
                }
                else
                {
                    discSfbPath = Path.Combine(inDir, "PS3_DISC.SFB");
                    if (File.Exists(discSfbPath))
                    {
                        input = Path.GetPathRoot(discSfbPath);
                        Drive = discSfbPath[0];
                    }
                }
            }
            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
            {
                if (string.IsNullOrEmpty(inDir))
                    inDir = "/media";
                discSfbPath = IOEx.GetFilepaths(inDir, "PS3_DISC.SFB", 2).FirstOrDefault();
                if (!string.IsNullOrEmpty(discSfbPath))
                    input = Path.GetDirectoryName(discSfbPath);
            }
            else
                throw new NotImplementedException("Current OS is not supported");

            if (string.IsNullOrEmpty(input) || string.IsNullOrEmpty(discSfbPath))
                throw new DriveNotFoundException("No valid PS3 disc was detected. Disc must be detected and mounted.");

            Log.Info("Selected disc: " + input);
            discSfbData = File.ReadAllBytes(discSfbPath);
            var replacedleId = CheckDiscSfb(discSfbData);
            var paramSfoPath = Path.Combine(input, "PS3_GAME", "PARAM.SFO");
            if (!File.Exists(paramSfoPath))
                throw new InvalidOperationException($"Specified folder is not a valid PS3 disc root (param.sfo is missing): {input}");

            using (var stream = File.Open(paramSfoPath, FileMode.Open, FileAccess.Read, FileShare.Read))
                ParamSfo = ParamSfo.ReadFrom(stream);
            CheckParamSfo(ParamSfo);
            if (replacedleId != ProductCode)
                Log.Warn($"Product codes in ps3_disc.sfb ({replacedleId}) and in param.sfo ({ProductCode}) do not match");

            // todo: maybe use discutils instead to read TOC as one block
            var files = IOEx.GetFilepaths(input, "*", SearchOption.AllDirectories);
            DiscFilenames = new List<string>();
            var totalFilesize = 0L;
            var rootLength = input.Length;
            foreach (var f in files)
            {
                try { totalFilesize += new FileInfo(f).Length; } catch { }
                DiscFilenames.Add(f.Substring(rootLength));
            }
            TotalFileSize = totalFilesize;
            TotalFileCount = DiscFilenames.Count;

            OutputDir = new string(outputDirFormatter(this).ToCharArray().Where(c => !InvalidChars.Contains(c)).ToArray());
            Log.Debug($"Output: {OutputDir}");
        }

public void Add(long val)
        {
            if (reading)
            {
                var val2 = Hash.StreamSerializer.ReadLong(stream);
                if (val != val2)
                    throw new CsCheckException($"Actual {val} but Expected {val2}. (last string was {lastString})");
            }
            else
            {
                using var stream = File.Open(filename, FileMode.Append, FileAccess.Write, FileShare.None);
                Hash.StreamSerializer.WriteLong(stream, val);
            }
        }

internal AesEncryptionResult EncryptWithFileStream(string sourceFilePath, string encryptedFilePath, byte[] key = null, byte[] IV = null, CipherMode cipherMode = CipherMode.CBC,
            PaddingMode paddingMode = PaddingMode.PKCS7, bool deleteSourceFile = false, int kBbufferSize = 4)
        {
            if (!File.Exists(sourceFilePath))
            {
                return new AesEncryptionResult()
                {
                    Success = false,
                    //Message = $"{MessageStrings.Common_FileNotFound} \"{sourceFilePath}\"."
                    Message = $"{MessageStrings.Common_FileNotFound} \"{sourceFilePath}\"."
                };
            }

            if (string.IsNullOrWhiteSpace(encryptedFilePath))
            {
                return new AesEncryptionResult()
                {
                    Success = false,
                    Message = MessageStrings.Encryption_EncryptedFilePathError
                };
            }

            var destinationDirectory = Path.GetDirectoryName(encryptedFilePath);

            if (!Directory.Exists(destinationDirectory))
            {
                return new AesEncryptionResult()
                {
                    Success = false,
                    Message = $"{MessageStrings.Encryption_DestinationDirectoryNotFound} \"{destinationDirectory}\"."
                };
            }

            _key = key ?? _key;
            _IV = IV ?? _IV;

            var pathsEqual = encryptedFilePath.Equals(sourceFilePath, StringComparison.InvariantCultureIgnoreCase);

            try
            {
                using (var aesManaged = new AesManaged())
                {
                    if (_key == null)
                    {
                        aesManaged.GenerateKey();
                        _key = aesManaged.Key;
                    }
                    else
                    {
                        if (aesManaged.ValidKeySize((_key.Length * 8)))
                        {
                            aesManaged.Key = _key;
                        }
                        else
                        {
                            return new AesEncryptionResult()
                            {
                                Success = false,
                                Message = $"{MessageStrings.Common_InvalidKeySizeError} ({(_key.Length * 8)})."
                            };
                        }
                    }

                    if (_IV == null || _IV.Length == 0)
                    {
                        aesManaged.GenerateIV();
                        _IV = aesManaged.IV;
                    }
                    else
                    {
                        aesManaged.IV = _IV;
                    }

                    aesManaged.Mode = cipherMode;
                    aesManaged.Padding = paddingMode;

                    using (var encryptor = aesManaged.CreateEncryptor(_key, _IV))
                    {
                        using (var sourceFs = File.Open(sourceFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                        {
                            using (var encryptedFs = File.Open((pathsEqual ? encryptedFilePath + "_tmpcrypt" : encryptedFilePath), FileMode.Create, FileAccess.Write, FileShare.None))
                            {
                                using (var cs = new CryptoStream(encryptedFs, encryptor, CryptoStreamMode.Write))
                                {
                                    //plain.CopyTo(cs);

                                    var buffer = new byte[kBbufferSize * 1024];
                                    int read;
                                    var percentageDone = 0;

                                    while ((read = sourceFs.Read(buffer, 0, buffer.Length)) > 0)
                                    {
                                        cs.Write(buffer, 0, read);

                                        var tmpPercentageDone = (int)(sourceFs.Position * 100 / sourceFs.Length);

                                        if (tmpPercentageDone != percentageDone)
                                        {
                                            percentageDone = tmpPercentageDone;

                                            RaiseOnEncryptionProgress(percentageDone, (percentageDone != 100 ? $"Encrypting ({percentageDone}%)..." : $"Encrypted ({percentageDone}%)."));
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                if (pathsEqual)
                {
                    CommonMethods.ClearFileAttributes(sourceFilePath); // set "Normal" FileAttributes to avoid erros while trying to delete the file below
                    File.Delete(sourceFilePath);
                    File.Move(encryptedFilePath + "_tmpcrypt", encryptedFilePath);
                }

                if (deleteSourceFile && !pathsEqual)
                {
                    CommonMethods.ClearFileAttributes(sourceFilePath); // set "Normal" FileAttributes to avoid erros while trying to delete the file below
                    File.Delete(sourceFilePath);
                }

                //var message = $"File \"{sourceFilePath}\" successfully encrypted to \"{encryptedFilePath}\".";
                var message = string.Format(MessageStrings.Encryption_FileEncryptSuccess, sourceFilePath, encryptedFilePath);
                message += (deleteSourceFile && !pathsEqual ? $"\n{string.Format(MessageStrings.Encryption_FileDeleted, sourceFilePath)}" : "");

                return new AesEncryptionResult()
                {
                    Success = true,
                    Message = message,
                    Key = _key,
                    IV = _IV,
                    AesCipherMode = (AesCipherMode)cipherMode,
                    PaddingMode = paddingMode
                };
            }
            catch (Exception ex)
            {
                return new AesEncryptionResult()
                {
                    Success = false,
                    Message = $"{MessageStrings.Encryption_ExceptionError}\n{ex.ToString()}"
                };
            }
        }

private Stream GetFileStream(PackageIdenreplacedy id, Func<string, string, string> pathFunc)
        {
            var versionString = id.Version.ToNormalizedString().ToLowerInvariant();
            var path = pathFunc(id.Id.ToLowerInvariant(), versionString);

            return File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read);
        }

static void Main(string[] args)
        {
            if (args.Length != 1)
            {
                Console.WriteLine("Usage:");
                Console.WriteLine("  gvas-converter path_to_save_file|path_to_json");
                return;
            }

            var ext = Path.GetExtension(args[0]).ToLower();
            if (ext == ".json")
            {
                Console.WriteLine("Not implemented atm");
            }
            else
            {
                Console.WriteLine("Parsing UE4 save file structure...");
                Gvas save;
                using (var stream = File.Open(args[0], FileMode.Open, FileAccess.Read, FileShare.Read))
                    save = UESerializer.Read(stream);

                Console.WriteLine("Converting to json...");
                var json = JsonConvert.SerializeObject(save, new JsonSerializerSettings{Formatting = Formatting.Indented});

                Console.WriteLine("Saving json...");
                using (var stream = File.Open(args[0] + ".json", FileMode.Create, FileAccess.Write, FileShare.Read))
                using (var writer = new StreamWriter(stream, new UTF8Encoding(false)))
                    writer.Write(json);
            }
            Console.WriteLine("Done.");
            Console.ReadKey(true);
        }

public async Task FindDiscKeyAsync(string discKeyCachePath)
        {
            // reload disc keys
            try
            {
                foreach (var keyProvider in DiscKeyProviders)
                {
                    Log.Trace($"Getting keys from {keyProvider.GetType().Name}...");
                    var newKeys = await keyProvider.EnumerateAsync(discKeyCachePath, ProductCode, Cts.Token).ConfigureAwait(false);
                    Log.Trace($"Got {newKeys.Count} keys");
                    lock (AllKnownDiscKeys)
                    {
                        foreach (var keyInfo in newKeys)
                        {
                            try
                            {
                                if (!AllKnownDiscKeys.TryGetValue(keyInfo.DecryptedKeyId, out var duplicates))
                                    AllKnownDiscKeys[keyInfo.DecryptedKeyId] = duplicates = new HashSet<DiscKeyInfo>();
                                duplicates.Add(keyInfo);
                            }
                            catch (Exception e)
                            {
                                Log.Error(e);
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failed to load disc keys");
            }
            // check if user provided something new since the last attempt
            var untestedKeys = new HashSet<string>();
            lock (AllKnownDiscKeys)
                untestedKeys.UnionWith(AllKnownDiscKeys.Keys);
            untestedKeys.ExceptWith(TestedDiscKeys);
            if (untestedKeys.Count == 0)
                throw new KeyNotFoundException("No valid disc decryption key was found");

            // select physical device
            string physicalDevice = null;
            List<string> physicalDrives = new List<string>();
            Log.Trace("Trying to enumerate physical drives...");
            try
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                    physicalDrives = EnumeratePhysicalDrivesWindows();
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                    physicalDrives = EnumeratePhysicalDrivesLinux();
                else
                    throw new NotImplementedException("Current OS is not supported");
            }
            catch (Exception e)
            {
                Log.Error(e);
                throw;
            }
            Log.Debug($"Found {physicalDrives.Count} physical drives");

            if (physicalDrives.Count == 0)
                throw new InvalidOperationException("No optical drives were found");

            foreach (var drive in physicalDrives)
            {
                try
                {
                    Log.Trace($"Checking physical drive {drive}...");
                    using var discStream = File.Open(drive, FileMode.Open, FileAccess.Read, FileShare.Read);
                    var tmpDiscReader = new CDReader(discStream, true, true);
                    if (tmpDiscReader.FileExists("PS3_DISC.SFB"))
                    {
                        Log.Trace("Found PS3_DISC.SFB, getting sector data...");
                        var discSfbInfo = tmpDiscReader.GetFileInfo("PS3_DISC.SFB");
                        if (discSfbInfo.Length == discSfbData.Length)
                        {
                            var buf = new byte[discSfbData.Length];
                            var sector = tmpDiscReader.PathToClusters(discSfbInfo.FullName).First().Offset;
                            Log.Trace($"PS3_DISC.SFB sector number is {sector}, reading content...");
                            discStream.Seek(sector * tmpDiscReader.ClusterSize, SeekOrigin.Begin);
                            discStream.ReadExact(buf, 0, buf.Length);
                            if (buf.SequenceEqual(discSfbData))
                            {
                                physicalDevice = drive;
                                break;
                            }
                            Log.Trace("SFB content check failed, skipping the drive");
                        }
                    }
                }
                catch (Exception e)
                {
                    Log.Debug($"Skipping drive {drive}: {e.Message}");
                }
            }
            if (physicalDevice == null)
                throw new AccessViolationException("Couldn't get physical access to the drive");

            Log.Debug($"Selected physical drive {physicalDevice}");
            driveStream = File.Open(physicalDevice, FileMode.Open, FileAccess.Read, FileShare.Read);

            // find disc license file
            discReader = new CDReader(driveStream, true, true);
            FileRecord detectionRecord = null;
            byte[] expectedBytes = null;
            try
            {
                foreach (var path in Detectors.Keys)
                    if (discReader.FileExists(path))
                    {
                        var clusterRange = discReader.PathToClusters(path);
                        detectionRecord = new FileRecord(path, clusterRange.Min(r => r.Offset), discReader.GetFileLength(path));
                        expectedBytes = Detectors[path];
                        if (detectionRecord.Length == 0)
                            continue;
                        
                        Log.Debug($"Using {path} for disc key detection");
                        break;
                    }
            }
            catch (Exception e)
            {
                Log.Error(e);
            }
            if (detectionRecord == null)
                throw new FileNotFoundException("Couldn't find a single disc key detection file, please report");

            if (Cts.IsCancellationRequested)
                return;

            SectorSize = discReader.ClusterSize;

            // select decryption key
            driveStream.Seek(detectionRecord.StartSector * discReader.ClusterSize, SeekOrigin.Begin);
            detectionSector = new byte[discReader.ClusterSize];
            detectionBytesExpected = expectedBytes;
            sectorIV = Decrypter.GetSectorIV(detectionRecord.StartSector);
            Log.Debug($"Initialized {nameof(sectorIV)} ({sectorIV?.Length * 8} bit) for sector {detectionRecord.StartSector}: {sectorIV?.ToHexString()}");
            driveStream.ReadExact(detectionSector, 0, detectionSector.Length);
            string discKey = null;
            try
            {
                discKey = untestedKeys.AsParallel().FirstOrDefault(k => !Cts.IsCancellationRequested && IsValidDiscKey(k));
            }
            catch (Exception e)
            {
                Log.Error(e);
            }
            if (discKey == null)
                throw new KeyNotFoundException("No valid disc decryption key was found");

            if (Cts.IsCancellationRequested)
                return;

            lock (AllKnownDiscKeys)
                AllKnownDiscKeys.TryGetValue(discKey, out allMatchingKeys);
            var discKeyInfo = allMatchingKeys?.First();
            DiscKeyFilename = Path.GetFileName(discKeyInfo?.FullPath);
            DiscKeyType = discKeyInfo?.KeyType ?? default;
        }

public void Open(string path)
        {
            if (_disposed)
            {
                throw new ObjectDisposedException("Shapefile");
            }

            if (path == null)
            {
                throw new ArgumentNullException("path");
            }
            if (path.Length <= 0)
            {
                throw new ArgumentException("path parameter is empty", "path");
            }

            _shapefileMainPath = Path.ChangeExtension(path, MainPathExtension);
            _shapefileIndexPath = Path.ChangeExtension(path, IndexPathExtension);
            _shapefileDbasePath = Path.ChangeExtension(path, DbasePathExtension);

            if (!File.Exists(_shapefileMainPath))
            {
                throw new FileNotFoundException("Shapefile main file not found", _shapefileMainPath);
            }
            if (!File.Exists(_shapefileIndexPath))
            {
                throw new FileNotFoundException("Shapefile index file not found", _shapefileIndexPath);
            }
            if (!File.Exists(_shapefileDbasePath))
            {
                throw new FileNotFoundException("Shapefile dBase file not found", _shapefileDbasePath);
            }

            _mainStream = File.Open(_shapefileMainPath, FileMode.Open, FileAccess.Read, FileShare.Read);
            _indexStream = File.Open(_shapefileIndexPath, FileMode.Open, FileAccess.Read, FileShare.Read);

            if (_mainStream.Length < Header.HeaderLength)
            {
                throw new InvalidOperationException("Shapefile main file does not contain a valid header");
            }

            if (_indexStream.Length < Header.HeaderLength)
            {
                throw new InvalidOperationException("Shapefile index file does not contain a valid header");
            }

            // read in and parse the headers
            byte[] headerBytes = new byte[Header.HeaderLength];
            _mainStream.Read(headerBytes, 0, Header.HeaderLength);
            _mainHeader = new Header(headerBytes);
            _indexStream.Read(headerBytes, 0, Header.HeaderLength);
            _indexHeader = new Header(headerBytes);

            // set properties from the main header
            _type = _mainHeader.ShapeType;
            _boundingBox = new RectangleD(_mainHeader.XMin, _mainHeader.YMin, _mainHeader.XMax, _mainHeader.YMax);

            // index header length is in 16-bit words, including the header - number of 
            // shapes is the number of records (each 4 workds long) after subtracting the header bytes
            _count = (_indexHeader.FileLength - (Header.HeaderLength / 2)) / 4;

            // open the metadata database
            OpenDb();

            _opened = true;
        }

private long WriteImageData(Snapshot sshot, Database db)
		{
			long position;
			try
			{
				var sessionDate = db.SelectSingle<DateTime>("SessionInfo", "CreateTime", new { SessionId = sshot.SessionId });
				string path = Path.Combine(DataPath, string.Format(@"{0:yyyy}\{0:MMdd}\{1}.rdt", sessionDate, sshot.SessionId));
				if (!Directory.Exists(Path.GetDirectoryName(path)))
					Directory.CreateDirectory(Path.GetDirectoryName(path));
				using (FileStream fs = File.Open(path, FileMode.Append, FileAccess.Write, FileShare.Read))
				{
					position = fs.Position;
					if (sshot.ImageData != null && sshot.ImageData.Length > 0)
					{
						fs.Write(sshot.ImageData, 0, sshot.ImageData.Length);
					}
					Debug.replacedert(sshot.EventsData != null && sshot.EventsData.Length > 0 && sshot.EventsData.Length % 16 == 0);
					fs.Write(sshot.EventsData, 0, sshot.EventsData.Length);
				}
			}
			catch (Exception ex) { TraceLogger.Instance.WriteException(ex); throw; }
			return position;
		}

private void ShowFileSendDialog(string fileName)
        {
            var dialog = new SendFileControlViewModel()
            {
                ContentStream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite),
                FileName = System.IO.Path.GetFileName(fileName),
                MessageContainer = this.MessageContainer,
                TypedMessageContents = this.TypedMessageContents,
                SendMessage = new RelayCommand<GroupMeClientApi.Models.Attachments.Attachment>(async (a) => await this.SendContentMessageAsync(a), (a) => !this.IsSending, true),
            };

            this.PopupManager.PopupDialog = dialog;
        }