Inheritance: IDecompressor, IInputStream, IClosable
Beispiel #1
0
        public async Task LoadCompressed()
        {
            try
            {
                var folder = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("xml");
                var file = await folder.GetFileAsync("world.compressed");
                //var stream = await file.OpenStreamForReadAsync();

                var decompressedFilename = "world.decompressed";
                var decompressedFile = await folder.CreateFileAsync(decompressedFilename, CreationCollisionOption.ReplaceExisting);

                using (var compressedInput = await file.OpenSequentialReadAsync())
                using (var decompressor = new Decompressor(compressedInput))
                using (var decompressedOutput = await decompressedFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    var bytesDecompressed = await RandomAccessStream.CopyAsync(decompressor, decompressedOutput);
                }
            }
            catch (Exception e)
            {
                throw e;
            }

            await Load();
        }
    public async void Open(TextBox display)
    {
        try
        {
            FileOpenPicker picker = new FileOpenPicker();
            picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
            picker.FileTypeFilter.Add(textExt);
            picker.FileTypeFilter.Add(compressedExt);
            StorageFile file = await picker.PickSingleFileAsync();
            switch (file.FileType)
            {
                case textExt:
                    display.Text = await FileIO.ReadTextAsync(file);
                    break;
                case compressedExt:
                    using (MemoryStream stream = new MemoryStream())
                    using (IInputStream input = await file.OpenSequentialReadAsync())
                    using (Decompressor decompressor = new Decompressor(input))
                    using (IRandomAccessStream output = stream.AsRandomAccessStream())
                    {
                        long inputSize = input.AsStreamForRead().Length;
                        ulong outputSize = await RandomAccessStream.CopyAsync(decompressor, output);
                        output.Seek(0);
                        display.Text = await new StreamReader(output.AsStream()).ReadToEndAsync();
                        Show(string.Format("Decompressed {0} bytes to {1} bytes",
                            inputSize, outputSize), "Compression App");
                    }
                    break;
                default:
                    break;
            }
        }
        catch
        {

        }
    }
        private async void CompressFile(CompressAlgorithm? Algorithm, StorageFile originalFile)
        {
            Progress.Text = "";
            
            try
            {
                Progress.Text += String.Format("\"{0}\" has been picked\n", originalFile.Name);

                var compressedFilename = originalFile.Name + ".compressed";
                var compressedFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(compressedFilename, CreationCollisionOption.GenerateUniqueName);
                Progress.Text += String.Format("\"{0}\" has been created to store compressed data\n", compressedFile.Path);

                // ** DO COMPRESSION **
                // Following code actually performs compression from original file to the newly created
                // compressed file. In order to do so it:
                // 1. Opens input for the original file.
                // 2. Opens output stream on the file to be compressed and wraps it into Compressor object.
                // 3. Copies original stream into Compressor wrapper.
                // 4. Finalizes compressor - it puts termination mark into stream and flushes all intermediate
                //    buffers.
                using (var originalInput = await originalFile.OpenReadAsync())
                using (var compressedOutput = await compressedFile.OpenAsync(FileAccessMode.ReadWrite))
                using (var compressor = !Algorithm.HasValue ?
                    new Compressor(compressedOutput.GetOutputStreamAt(0)) :
                    new Compressor(compressedOutput.GetOutputStreamAt(0), Algorithm.Value, 0))
                {
                    Progress.Text += "All streams wired for compression\n";
                    var bytesCompressed = await RandomAccessStream.CopyAsync(originalInput, compressor);
                    var finished = await compressor.FinishAsync();
                    Progress.Text += String.Format("Compressed {0} bytes into {1}\n", bytesCompressed, compressedOutput.Size);
                }

                var decompressedFilename = originalFile.Name + ".decompressed";
                var decompressedFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(decompressedFilename, CreationCollisionOption.GenerateUniqueName);
                Progress.Text += String.Format("\"{0}\" has been created to store decompressed data\n", decompressedFile.Path);

                // ** DO DECOMPRESSION **
                // Following code performs decompression from the just compressed file to the
                // decompressed file. In order to do so it:
                // 1. Opens input stream on compressed file and wraps it into Decompressor object.
                // 2. Opens output stream from the file that will store decompressed data.
                // 3. Copies data from Decompressor stream into decompressed file stream.
                using (var compressedInput = await compressedFile.OpenSequentialReadAsync())
                using (var decompressor = new Decompressor(compressedInput))
                using (var decompressedOutput = await decompressedFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    Progress.Text += "All streams wired for decompression\n";
                    var bytesDecompressed = await RandomAccessStream.CopyAsync(decompressor, decompressedOutput);
                    Progress.Text += String.Format("Decompressed {0} bytes of data\n", bytesDecompressed);
                }

                rootPage.NotifyUser("All done", NotifyType.StatusMessage);
            }
            catch (Exception ex)
            {
                rootPage.NotifyUser(ex.Message, NotifyType.ErrorMessage);
            }
        }