public async Task<BlobFingerprint> GetFingerprintAsync(Stream stream, CancellationToken cancellationToken)
{
using (var sha3 = new Keccak())
using (var sha256 = SHA256.Create())
using (var md5 = MD5.Create())
{
var buffers = new[] { AllocateBuffer(), AllocateBuffer() };
var index = 0;
var totalLength = 0L;
var readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
for (;;)
{
var length = await readTask.ConfigureAwait(false);
if (length < 1)
break;
var buffer = buffers[index];
if (++index >= buffers.Length)
index = 0;
readTask = stream.ReadAsync(buffers[index], 0, buffers[index].Length, cancellationToken);
totalLength += length;
sha3.TransformBlock(buffer, 0, length, null, 0);
sha256.TransformBlock(buffer, 0, length, null, 0);
md5.TransformBlock(buffer, 0, length, null, 0);
}
sha3.TransformFinalBlock(buffers[0], 0, 0);
sha256.TransformFinalBlock(buffers[0], 0, 0);
md5.TransformFinalBlock(buffers[0], 0, 0);
foreach (var buffer in buffers)
FreeBuffer(buffer);
var fingerprint = new BlobFingerprint(totalLength, sha3.Hash, sha256.Hash, md5.Hash);
return fingerprint;
}
}
public static async Task<long> CopyStreamsAsyncParallel(Stream src, Stream dst)
{
long numCopied = 0;
byte[][] buffer = new byte[2][];
buffer[0] = new byte[0x1000];
buffer[1] = new byte[0x1000];
var index = 0;
int numRead = await src.ReadAsync(buffer[index], 0, buffer[index].Length);
while (numRead > 0)
{
var writeAsync = dst.WriteAsync(buffer[index], 0, numRead);
index = index ^= 1;
var readAsync = src.ReadAsync(buffer[index], 0, buffer[index].Length);
Task.WaitAll(writeAsync, readAsync);
numRead = readAsync.Result;
numCopied += numRead;
}
await dst.FlushAsync();
src.Dispose();
dst.Dispose();
return numCopied;
}
public async Task LoadAsync(Stream input, CancellationToken cancellationToken)
{
if (input == null) throw new ArgumentNullException(nameof(input));
var headerSizeBuffer = BitConverter.GetBytes(default(int));
await input.ReadAsync(headerSizeBuffer, 0, headerSizeBuffer.Length, cancellationToken);
var headerSize = BitConverter.ToInt32(headerSizeBuffer, 0);
var headerBuffer = new byte[headerSize];
await input.ReadAsync(headerBuffer, 0, headerBuffer.Length, cancellationToken);
// Clear the files
this.Files.Clear();
using (var sr = new StringReader(Encoding.Unicode.GetString(headerBuffer, 0, headerBuffer.Length)))
{
var separator = new[] { '|' };
string line;
while ((line = await sr.ReadLineAsync()) != null)
{
var values = line.Split(separator);
this.Add(values[0], int.Parse(values[1]));
}
}
}
public override async Task FromStreamAsync(Stream stream, uint tagLength, TagVersion version)
{
long streamStart = stream.Position;
int encoding = stream.ReadByte();
switch (version)
{
case TagVersion.V24:
case TagVersion.V23:
if (encoding == 0x00)
{
MimeType = await stream.ReadAnsiString(streamStart + tagLength).ConfigureAwait(false);
PictureType = (AttachedPictureType)stream.ReadByte();
Description = await stream.ReadAnsiString(streamStart + tagLength).ConfigureAwait(false);
Data = new byte[tagLength - (stream.Position - streamStart)];
await stream.ReadAsync(Data, 0, Data.Length).ConfigureAwait(false);
}
else if (encoding == 0x01)
{
MimeType = await stream.ReadAnsiString(streamStart + tagLength).ConfigureAwait(false);
PictureType = (AttachedPictureType)stream.ReadByte();
Description = await stream.ReadUnicodeStringAsync(streamStart + tagLength).ConfigureAwait(false);
Data = new byte[tagLength - (stream.Position - streamStart)];
await stream.ReadAsync(Data, 0, Data.Length).ConfigureAwait(false);
}
break;
default:
Debug.WriteLine("APIC: Version not implemented - " + version.ToString());
break;
}
}
internal static async Task<TagHeader> ReadTagHeader(Stream stream)
{
var header = new TagHeader();
byte[] headerBytes = ArrayPool<byte>.Shared.Rent(7);
await stream.ReadAsync(headerBytes, 0, 7).ConfigureAwait(false);
switch (Convert.ToInt32(headerBytes[0]))
{
case 2:
header.Version = TagVersion.V22;
break;
case 3:
header.Version = TagVersion.V23;
break;
case 4:
header.Version = TagVersion.V24;
break;
default:
header.Version = TagVersion.Unknown;
break;
}
header.Unsynchronization = ((headerBytes[2] & 0x80) == 0x80);
header.ExtendedHeader = ((headerBytes[2] & 0x40) == 0x40);
header.Experimental = ((headerBytes[2] & 0x20) == 0x20);
header.HasFooter = ((headerBytes[2] & 0x10) == 0x10);
header.TagLength = headerBytes[3] * 128 * 128 * 128 + headerBytes[4] * 128 * 128 + headerBytes[5] * 128 + headerBytes[6];
ArrayPool<byte>.Shared.Return(headerBytes);
return header;
}
public async Task <IChunkValidation> VerifyChunkAsync(System.IO.Stream fileStream, long from, long to, string expectedMd5, IStatus status)
{
if (!fileStream.CanSeek)
{
throw new Exception("Unable to seek in the file stream");
}
var chunkValidation = new ChunkValidation
{
From = from,
To = to,
ExpectedHash = expectedMd5
};
fileStream.Seek(from, SeekOrigin.Begin);
var length = (int)(to - from + 1);
byte[] buffer = new byte[length];
await fileStream.ReadAsync(buffer, 0, length);
chunkValidation.ActualHash = await getBytesHashAsyncDelegate.GetHashAsync(buffer, status);
return(chunkValidation);
}
private async void ReadAsync(Stream stream)
{
byte[] buffer = new byte[100];
while (true)
{
try
{
int length = await stream.ReadAsync(buffer, 0, buffer.Length);
Invoke(new MethodInvoker(delegate
{
outputText.Append(buffer, length);
}));
}
catch
{
if (this.Visible) { // we're not being closed
Invoke(new MethodInvoker(delegate
{
Stop(false);
}));
}
break;
}
}
}
static async Task <int> Reader(System.IO.Stream stream)
{
Console.WriteLine("Reader started");
int r = 0;
for (; ;)
{
byte[] buffer = new byte[1024];
try
{
int read = await stream.ReadAsync(buffer, 0, 1024);
if (read == 0)
{
Console.WriteLine("read == 0");
break;
}
r += read;
}
catch (Exception e)
{
break;
}
}
return(r);
}
// Reads a single FIX messages and returns it. It shall contain
// all fields, including header and trailer. No validation is
// performed.
//
// This method is NOT thread-safe.
//
// Throws MessageTooLargeException if incoming message exceeds
// MaxMessageSize. After that every call to ReadMessage() will throw
// MessageTooLargeException.
//
// Throws EmptyStreamException if nothing can be read from the
// underlying stream.
public async Task<ArraySegment<byte>> ReadMessage(Stream strm)
{
Assert.True(strm != null);
var trailerMatcher = new MessageTrailerMatcher();
int messageEnd = trailerMatcher.FindTrailer(_buf, _startPos, _endPos);
// Keep reading from the underlying stream until we find trailer.
while (messageEnd == 0)
{
EnsureBufferSpace();
Assert.True(_endPos < _buf.Length, "_endPos = {0}, _buf.Length = {1}", _endPos, _buf.Length);
int read = await strm.ReadAsync(_buf, _endPos, _buf.Length - _endPos);
if (read <= 0)
{
var partial = new ArraySegment<byte>(_buf, _startPos, _endPos - _startPos);
throw new EmptyStreamException("Read so far: " + partial.AsAscii());
}
messageEnd = trailerMatcher.FindTrailer(_buf, _endPos, _endPos + read);
_endPos += read;
}
var res = new ArraySegment<byte>(_buf, _startPos, messageEnd - _startPos);
_startPos = messageEnd;
if (_log.IsDebugEnabled) _log.Debug("IN: {0}", res.AsAscii());
else _log.Info("IN: {0}", Truncate(res.AsAscii(), 1024));
return res;
}
// this thing is roughly equivalent to:
//public async Task<string> ReadStreamToEnd(Stream stream)
//{
// ...
// var bytesRead = await steam.ReadAsync(buffer, 0, buffer.Length);
// ...
//}
public static IEnumerable<object> ReadStreamToEnd(Stream stream)
{
StringBuilder sb = new StringBuilder();
var buffer = new byte[1024];
var bytesRead = 0;
do
{
// synchronous example--would work! probably gum up your throughput though
//bytesRead = stream.Read(buffer, 0, buffer.Length);
//var read = stream.ReadAsync(buffer, 0, buffer.Length);
//yield return read;
//bytesRead = read.GetResult<int>();
var read = stream.ReadAsync(buffer, 0, buffer.Length);
yield return read;
Console.WriteLine("read " + read.Result);
bytesRead = read.Result;
// impossible.
//Exception ex = null;
//yield return stream.ReadAsyncC(buffer, 0, buffer.Length)(n => bytesRead = n, e => ex = e);
//var read = stream.ReadAsyncTask(buffer, 0, buffer.Length);
//yield return read;
//bytesRead = read.Result;
sb.Append(Encoding.UTF8.GetString(buffer, 0, bytesRead));
}
while (bytesRead > 0);
yield return sb.ToString();
}
public async Task UnpackAsync(Stream input, DirectoryInfo folder, bool append)
{
if (input == null) throw new ArgumentNullException("input");
if (folder == null) throw new ArgumentNullException("folder");
var mode = FileMode.Create;
if (append)
{
mode = FileMode.Append;
}
foreach (var fileHeader in NetworkHelper.ReadString(input, _buffer).Split(PackageHelper.FileSeparator))
{
var name = fileHeader.Substring(0, fileHeader.IndexOf(PackageHelper.SizeSeparator));
var filePath = Path.Combine(folder.FullName, name);
var folderPath = Path.GetDirectoryName(filePath);
if (!Directory.Exists(folderPath))
{
Directory.CreateDirectory(folderPath);
}
using (var output = new FileStream(filePath, mode))
{
int readBytes;
while ((readBytes = await input.ReadAsync(_buffer, 0, _buffer.Length)) != 0)
{
await output.WriteAsync(_buffer, 0, readBytes);
}
}
}
}
private async Task CopyStream(Stream source, Stream destination)
{
var buffer = new byte[1024];
var totalRead = 0;
var token = cancellationTokenSource.Token;
try
{
while (true)
{
var read = await source.ReadAsync(buffer, 0, 1024, token);
if (read == 0)
{
break;
}
Interlocked.Add(ref totalRead, read);
if (shouldThrow(totalRead, buffer, 0, read))
{
throw new Exception("Connection closed");
}
await destination.WriteAsync(buffer, 0, read, token);
destination.Flush();
}
}
finally
{
source.Close();
destination.Close();
}
}
public async Task Download(Storage storage, Action<int> downloadProgress, Action<int> writeProgressAction, CancellationToken ct, Stream responseStream)
{
using (responseStream)
{
try
{
for (;;)
{
if (!EnoughSpaceInWriteBuffer())
{
FlushBuffer(storage, writeProgressAction);
}
var bytesRead = await responseStream.ReadAsync(_writeBuffer, _writeBufferPosition, MaxPortionSize, ct);
if (bytesRead == 0)
{
FlushBuffer(storage, writeProgressAction);
break;
}
MoveReadBufferPosition(bytesRead);
downloadProgress(bytesRead);
}
}
finally
{
FlushBuffer(storage, writeProgressAction);
}
}
}
public async void TakePhoto()
{
if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
{
await DisplayAlert("No Camera", "No camera available.", "OK");
return;
}
var file = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
{
PhotoSize = PhotoSize.Medium,
CompressionQuality = 95
});
if (file == null)
{
return;
}
imageStream = file.GetStream();
byteStream = new byte[imageStream.Length];
await imageStream.ReadAsync(byteStream, 0, (int)imageStream.Length);
// Store as string
imageStreamBase64 = Convert.ToBase64String(byteStream);
PostImage.Source = ImageSource.FromStream(() => new MemoryStream(byteStream));
}
/// <summary>Standard read/write loop using ReadAsync on the source and WriteAsync on the destination.</summary>
private static async Task ArrayPoolCopyToAsyncCore(Stream source, Stream destination, int bufferSize, CancellationToken cancellationToken)
{
byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
bufferSize = 0; // reuse same field for high water mark to avoid needing another field in the state machine
try
{
while (true)
{
int bytesRead = await source.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
if (bytesRead == 0)
{
break;
}
if (bytesRead > bufferSize)
{
bufferSize = bytesRead;
}
await destination.WriteAsync(buffer, 0, bytesRead, cancellationToken).ConfigureAwait(false);
}
}
finally
{
Array.Clear(buffer, 0, bufferSize); // clear only the most we used
ArrayPool<byte>.Shared.Return(buffer, clearArray: false);
}
}
public async void PickPhoto()
{
if (!CrossMedia.Current.IsPickPhotoSupported)
{
await DisplayAlert("Photos Not Supported", "Permission not granted to photos.", "OK");
return;
}
var file = await CrossMedia.Current.PickPhotoAsync(new Plugin.Media.Abstractions.PickMediaOptions
{
PhotoSize = PhotoSize.Medium,
CompressionQuality = 95
});
if (file == null)
{
return;
}
imageStream = file.GetStream();
byteStream = new byte[imageStream.Length];
await imageStream.ReadAsync(byteStream, 0, (int)imageStream.Length);
// Store as string
imageStreamBase64 = Convert.ToBase64String(byteStream);
PostImage.Source = ImageSource.FromStream(() => new MemoryStream(byteStream));
}
public async Task<BitmapSource> LoadImageAsync(Stream imageStream, Uri uri)
{
if (imageStream == null)
{
return null;
}
var stream = new InMemoryRandomAccessStream();
imageStream.CopyTo(stream.AsStreamForWrite());
stream.Seek(0);
BitmapImage bitmap = new BitmapImage();
await bitmap.SetSourceAsync(stream);
// convert to a writable bitmap so we can get the PixelBuffer back out later...
// in case we need to edit and/or re-encode the image.
WriteableBitmap bmp = new WriteableBitmap(bitmap.PixelHeight, bitmap.PixelWidth);
stream.Seek(0);
bmp.SetSource(stream);
List<Byte> allBytes = new List<byte>();
byte[] buffer = new byte[4000];
int bytesRead = 0;
while ((bytesRead = await imageStream.ReadAsync(buffer, 0, 4000)) > 0)
{
allBytes.AddRange(buffer.Take(bytesRead));
}
DataContainerHelper.Instance.WriteableBitmapToStorageFile(bmp, uri);
return bmp;
}
public async Task<string> ToBase64String(Stream stream)
{
var buffer = new byte[stream.Length];
await stream.ReadAsync(buffer, 0, buffer.Length);
var base64String = ToBase64String(buffer);
return base64String;
}
public static async Task ReadExactly(int length, System.IO.Stream stream, ArraySegment <byte> buffer, CancellationToken cancellationToken)
{
if (length == 0)
{
return;
}
if (buffer.Count < length)
{
// This will happen if the calling function supplied a buffer that was too small to fit the payload of the websocket frame.
// Note that this can happen on the close handshake where the message size can be larger than the regular payload
throw new InternalBufferOverflowException($"Unable to read {length} bytes into buffer (offset: {buffer.Offset} size: {buffer.Count}). Use a larger read buffer");
}
int offset = 0;
do
{
int bytesRead = await stream.ReadAsync(buffer.Array, buffer.Offset + offset, length - offset, cancellationToken);
if (bytesRead == 0)
{
throw new EndOfStreamException(string.Format("Unexpected end of stream encountered whilst attempting to read {0:#,##0} bytes", length));
}
offset += bytesRead;
} while (offset < length);
return;
}
public async Task<long> ReadSegments(
IObserver<RecordSegment> observer,
Stream stream,
CancellationToken cancellationToken) {
var lastOffset = stream.Position;
var buffer = new byte[this.BufferSize];
var kmpStateStart = 0;
var kmpStateEnd = 0;
var lastStartOffesets = new long[0];
while (true) {
var baseOffset = stream.Position;
var count = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken);
if (count == 0)
return lastOffset;
var startOffsets = KmpUtil.GetOccurences(
EventStart,
new ArraySegment<byte>(buffer, 0, count),
cancellationToken,
ref kmpStateStart);
var endOffsets = KmpUtil.GetOccurences(
EventEnd,
new ArraySegment<byte>(buffer, 0, count),
cancellationToken,
ref kmpStateEnd);
if (endOffsets.Count == 0 || (startOffsets.Count + lastStartOffesets.Length) == 0)
return lastOffset;
var segments = endOffsets.Zip(
lastStartOffesets
.Concat(startOffsets.Select(offset => baseOffset + offset))
.Take(endOffsets.Count),
(end, start) =>
new RecordSegment(start, (int) (baseOffset + end + EventEnd.Length - start)));
var empty = true;
foreach (var segment in segments) {
empty = false;
observer.OnNext(segment);
lastOffset = segment.End;
}
if (empty)
return lastOffset;
lastStartOffesets = lastStartOffesets
.Concat(startOffsets.Select(x => baseOffset + x))
.Skip(endOffsets.Count)
.ToArray();
}
}
public async Task<FastCGIPacket> ReadFromAsync(Stream ClientStream)
{
var Header = new byte[8];
await ClientStream.ReadAsync(Header, 0, Header.Length);
var Version = Header[0];
Type = (FastCGI.PacketType)Header[1];
RequestId = (ushort)((Header[2] << 8) | (Header[3] << 0));
var ContentLength = (ushort)((Header[4] << 8) | (Header[5] << 0));
var PaddingLength = Header[6];
Content = new ArraySegment<byte>(new byte[ContentLength]);
if (ContentLength + PaddingLength > 0)
{
await ClientStream.ReadAsync(Content.Array, 0, ContentLength);
await ClientStream.ReadAsync(PaddingRead, 0, PaddingLength);
}
return this;
}
public async Task AddFileAsync(string outputPath, Stream sourceStream)
{
// There could be some problems in this implementation if the
// length is too much. Hopefully for the tests, that's not the case
// and it's mostly ok.
byte[] contents = new byte[sourceStream.Length];
await sourceStream.ReadAsync(contents, 0, contents.Length);
_files[outputPath] = Encoding.UTF8.GetString(contents);
}
public async void StreamCopyTo(Stream destination, int bufferSize)
{
byte[] array = new byte[bufferSize];
int count;
while ((count = await destination.ReadAsync(array, 0, array.Length)) != 0)
{
await destination.WriteAsync(array, 0, count);
}
}
private async Task AssertHeaderAndOpen(Stream stream)
{
var buffer = new byte[2000];
int bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
var head = Encoding.UTF8.GetString(buffer, 0, bytesRead);
Assert.True(head.StartsWith(string.Format(s_head, "callback")));
Assert.True(bytesRead > 1024);
if (head.EndsWith(s_open))
{
Assert.True(head.EndsWith(s_open));
}
else
{
bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
var open = Encoding.UTF8.GetString(buffer, 0, bytesRead);
Assert.Equal(s_open, open);
}
}
public static async Task CopyDataBlocksToStreamAsync(Stream sourceStream, Stream targetStream, CancellationToken cancellationToken = default(CancellationToken))
{
int len;
while ((len = await sourceStream.ReadByteAsync()) > 0)
{
byte[] bytes = new byte[len];
await sourceStream.ReadAsync(bytes, 0, len, cancellationToken).ConfigureAwait(false);
await targetStream.WriteAsync(bytes, 0, len, cancellationToken);
}
}
public async Task<HttpResponseMessage> Save(Stream dataStream, User user, string photoDescription, double? rating, string fileExtension, bool isAvatar)
{
var bufferOriginal = new byte[dataStream.Length];
var maxSize = user.Account.MaxSize;
var photos = user.Photos;
var currentSize = (photos == null ? 0 : photos.Sum(p => p.Size));
// counting in MB
if (maxSize != null && currentSize + (double) bufferOriginal.Length / 1024 / 1024 > maxSize)
{
var response = new HttpResponseMessage(HttpStatusCode.MethodNotAllowed);
response.Content = new StringContent("The file doesn't meet size limit requirements", Encoding.UTF8, "text/plain");
return response;
};
await dataStream.ReadAsync(bufferOriginal, 0, (int)dataStream.Length);
//var prefix = System.Configuration. .ConfigurationManager.AppSettings["pathSave"] ?? "~/images/";
var prefix = "~/images/";
var uploadFolderOriginal = prefix + user.Login + "/original/";
var uploadFolderPreview = prefix + user.Login + "/preview/";
var rootOriginal = HttpContext.Current.Server.MapPath(uploadFolderOriginal);
var rootPreview = HttpContext.Current.Server.MapPath(uploadFolderPreview);
Directory.CreateDirectory(rootOriginal);
Directory.CreateDirectory(rootPreview);
var bufferPreview = PhotoConverter.Resize(bufferOriginal, 100, 100);
var suffix = Guid.NewGuid() + "." + fileExtension;
rootOriginal += suffix;
uploadFolderOriginal += suffix;
rootPreview += suffix;
uploadFolderPreview += suffix;
using (var stream = new FileStream(rootOriginal, FileMode.OpenOrCreate))
{
await stream.WriteAsync(bufferOriginal, 0, bufferOriginal.Length);
}
using (var stream = new FileStream(rootPreview, FileMode.OpenOrCreate))
{
await stream.WriteAsync(bufferPreview, 0, bufferPreview.Length);
}
var photo = new Photo
{
Description = photoDescription,
User = user,
Size = (double)dataStream.Length / 1024 / 1024,
Rating = rating,
SrcOriginal = uploadFolderOriginal,
SrcPreview = uploadFolderPreview,
};
photosDb.Add(photo);
photosDb.Save();
var result = new HttpResponseMessage(HttpStatusCode.OK);
result.Content = new StringContent("Successful upload", Encoding.UTF8, "text/plain");
return result;
}
public override async Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
await _handshaker.EnsureHandshakeCompleteAsync(MultistreamHandshaker.HandshakeDirection.Incoming, cancellationToken).ConfigureAwait(false);
if (count == 0)
{
return(0);
}
return(await _stream.ReadAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false));
}
private static int EndRead(Stream stream, IAsyncResult ar, byte[] buffer)
{
try
{
return stream.EndRead(ar);
}
catch (Exception)
{
return stream.ReadAsync(buffer).Result;
}
}
private async Task<byte[]> ReadBytesAsync(Stream stream, int count, byte[] buffer = null, CancellationToken cancellationToken = default(CancellationToken)) {
buffer = buffer ?? new byte[count];
int bytesRemaining = count;
int totalBytesRead = 0;
while (bytesRemaining > 0) {
int bytesRead = await stream.ReadAsync(buffer, totalBytesRead, bytesRemaining, cancellationToken).ConfigureAwait(false);
bytesRemaining -= bytesRead;
totalBytesRead += bytesRead;
}
return buffer;
}
public static async Task<Message> DeserializeFromStreamAsync(Stream stream)
{
byte[] buffer = new byte[sizeof(uint) + 12 + sizeof(uint) + sizeof(uint)];
await stream.ReadAsync(buffer, 0, buffer.Length);
Message message = new Message();
using (MemoryStream ms = new MemoryStream(buffer, false))
using (BinaryReader reader = new BinaryReader(ms))
{
if (reader.ReadUInt32() != Magic)
throw new FormatException();
message.Command = reader.ReadFixedString(12);
uint length = reader.ReadUInt32();
if (length > 0x02000000)
throw new FormatException();
message.Checksum = reader.ReadUInt32();
message.Payload = new byte[length];
}
await stream.ReadAsync(message.Payload, 0, message.Payload.Length);
return message;
}
public static async Task ReadLoop(Stream stream)
{
var buffer = new byte[4096];
var count = -1;
while (count != 0)
{
count = await stream.ReadAsync(buffer, 0, buffer.Length);
//Console.WriteLine(Encoding.UTF8.GetString(buffer, 0, count) +"->Responsed");
_packetReceived++;
}
}
public async Task<Uri> UploadMessageAsync(Stream encryptedMessageContent, DateTime expiration, string contentType, string contentEncoding, CancellationToken cancellationToken) {
Assert.That(encryptedMessageContent.Length, Is.GreaterThan(0));
Assert.That(encryptedMessageContent.Position, Is.EqualTo(0));
var buffer = new byte[encryptedMessageContent.Length - encryptedMessageContent.Position];
await encryptedMessageContent.ReadAsync(buffer, 0, buffer.Length);
lock (this.blobs) {
var contentUri = new Uri(BaseUploadUri + (this.blobs.Count + 1));
this.blobs[contentUri] = buffer;
return contentUri;
}
}
public async Task<FastcgiPacket> ReadFromAsync(Stream ClientStream)
{
var Header = new byte[8];
await ClientStream.ReadAsync(Header, 0, Header.Length);
var Version = Header[0];
Type = (Fastcgi.PacketType)Header[1];
//BitConverter.ToUInt16()
RequestId = (ushort)((Header[2] << 8) | (Header[3] << 0));
var ContentLength = (ushort)((Header[4] << 8) | (Header[5] << 0));
var PaddingLength = Header[6];
Content = new ArraySegment<byte>(new byte[ContentLength]);
if (ContentLength + PaddingLength > 0)
{
await ClientStream.ReadAsync(Content.Array, 0, ContentLength);
await ClientStream.ReadAsync(PaddingRead, 0, PaddingLength);
}
//await Console.Out.WriteLineAsync(String.Format("READ: Packet({0}): {1}({2}:{3})", RequestId, Type, ContentLength, PaddingLength));
return this;
}
protected override async Task<int> ReadStreamAsync(Stream stream, byte[] buffer, string key)
{
int read = await stream.ReadAsync(buffer, 0, buffer.Length);
// Close stream after download is finished and allow caching of the file
if (read == 0)
{
stream.Dispose();
}
return read;
}
private static async Task ReadResponseStreamAsync(Stream responseStream)
{
byte[] readBuffer = new byte[512];
int bytesRead;
while ((bytesRead = await responseStream.ReadAsync(readBuffer, 0, readBuffer.Length)) != 0)
{
string content = Encoding.UTF8.GetString(readBuffer, 0, bytesRead);
Console.WriteLine("Received: {0}", content);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
#if NETFX_CORE
var task = stream.ReadAsync(buffer, offset, count);
task.Wait();
if (task.IsFaulted)
{
throw task.Exception;
}
return(task.Result);
#else
return(stream.Read(buffer, offset, count));
#endif
}
private async Task copyStreamAsync(System.IO.Stream input, System.IO.Stream output, int bufferSize)
{
byte[] buffer;
int len;
buffer = new byte[bufferSize];
while ((len = await input.ReadAsync(buffer, 0, bufferSize)) > 0)
{
await output.WriteAsync(buffer, 0, len);
}
await output.FlushAsync();
}
/// <summary>
/// Copies potentially large stream, raising event as percent changes
/// </summary>
/// <param name="inStream">still open</param>
/// <param name="outStream">flushed, but still open</param>
/// <param name="inLength"></param>
public static async Task StreamCopyWithProgress(System.IO.Stream inStream, System.IO.Stream outStream, long inLength)
{
byte[] zBuffer = new byte[16384];
int zLen = 0;
int pct = 0;
int lastPct = 0;
double totalToDo = inLength;
if (totalToDo == 0)
{
totalToDo = 1024 * 1024 * 1024;
}
long doneSoFar = 0;
Boolean Copying = true;
while (Copying)
{
zLen = await inStream.ReadAsync(zBuffer, 0, zBuffer.Length);
if (zLen == 0)
{
Copying = false;
}
else
{
await outStream.WriteAsync(zBuffer, 0, zLen);
doneSoFar += zLen;
if (totalToDo < (doneSoFar + zBuffer.Length))
{
totalToDo *= 2;
}
pct = Convert.ToInt32((doneSoFar / totalToDo) * 100);
if (pct > lastPct)
{
if (Progress != null)
{
Progress(inStream, pct);
}
lastPct = pct;
}
}
}
if (Progress != null)
{
Progress(inStream, 100);
}
outStream.Flush();
}
public static async Task <string> ReadNextTokenAsync(System.IO.Stream stream, CancellationToken cancellationToken)
{
var length = await Binary.Varint.ReadUInt64Async(stream).ConfigureAwait(false);
if (length == 0)
{
return(string.Empty);
}
if (length > 64 * 1024)
{
await DelimWriteBufferedAsync(stream, BytesMessageTooLarge, cancellationToken).ConfigureAwait(false);
throw ErrMessageTooLarge;
}
var buffer = new byte[length];
int res = 0;
int total = 0;
while ((res = await stream.ReadAsync(buffer, total, buffer.Length - total, cancellationToken).ConfigureAwait(false)) > 0)
{
total += res;
if (total == (int)length)
{
break;
}
await Task.Delay(1, cancellationToken).ConfigureAwait(false);
}
if (res <= 0)
{
return(string.Empty);
}
if (total != buffer.Length)
{
throw new Exception("could not read token");
}
if ((buffer.Length == 0) || (buffer[length - 1] != Delimiter))
{
throw ErrMessageMissingNewline;
}
return(Encoding.UTF8.GetString(buffer, 0, buffer.Length - 1));
}
/// <summary>
/// Writes a stream to another stream asynchronously
/// </summary>
/// <param name="readStream">the stream you need to read.</param>
/// <param name="writeStream">the stream you want to write to.</param>
/// <param name="onPercentageUpdate">Action to take on write percentage update.</param>
public static async Task ReadWriteStreamAsync(Stream readStream, Stream writeStream, Action <int> onPercentageUpdate)
{
onPercentageUpdate?.Invoke(0);
int Length = 65536;
byte[] buffer = new byte[Length];
long totalBytes = readStream.Length;
long receivedBytes = 0;
int i = 0;
int updateFrequency = 2;
for (;;)
{
int bytesRead;
if (i % updateFrequency == 0)
{
bytesRead = await readStream.ReadAsync(buffer, 0, buffer.Length);
}
else
{
bytesRead = readStream.Read(buffer, 0, buffer.Length);
}
if (bytesRead == 0)
{
await Task.Yield();
break;
}
writeStream.Write(buffer, 0, bytesRead);
receivedBytes += bytesRead;
if (i++ % updateFrequency == 0)
{
onPercentageUpdate?.Invoke((int)(((float)receivedBytes / totalBytes) * 100));
}
}
onPercentageUpdate?.Invoke(100);
readStream.Dispose();
writeStream.Dispose();
}
public static async Task <int> WriteFileAsync(System.IO.Stream stream, string path)
{
const int FILE_WRITE_SIZE = 84975;//写出缓冲区大小
int writeCount = 0;
using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Write, FILE_WRITE_SIZE, true)) {
byte[] byteArr = new byte[FILE_WRITE_SIZE];
int readCount = 0;
while ((readCount = await stream.ReadAsync(byteArr, 0, byteArr.Length)) > 0)
{
await fileStream.WriteAsync(byteArr, 0, readCount);
writeCount += readCount;
}
}
return(writeCount);
}
private static async Task <int> WriteFileAsync(System.IO.Stream stream, string path)
{
int writeCount = 0;
using (FileStream fileStream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Write, UploadConstants.BigFileWriteSize, true))
{
byte[] byteArr = new byte[UploadConstants.BigFileWriteSize];
int readCount = 0;
while ((readCount = await stream.ReadAsync(byteArr, 0, byteArr.Length)) > 0)
{
await fileStream.WriteAsync(byteArr, 0, readCount);
writeCount += readCount;
}
}
return(writeCount);
}
async void OnMessage
(Windows.Networking.Sockets.DatagramSocket sender,
Windows.Networking.Sockets.DatagramSocketMessageReceivedEventArgs args)
{
using (System.IO.Stream stream = args.GetDataStream().AsStreamForRead())
{
// 受信データを取得
byte[] receiveBytes = new byte[MAX_BUFFER_SIZE];
await stream.ReadAsync(receiveBytes, 0, MAX_BUFFER_SIZE);
lock (p_LockObject)
{
// 受信データを処理に引き渡す
UDPReceiveEvent(receiveBytes);
}
}
}
/// <summary>
/// Creates an enumerable to be used with TaskFactoryExtensions.Iterate that copies data from one
/// stream to another.
/// </summary>
/// <param name="input">The input stream.</param>
/// <param name="output">The output stream.</param>
/// <returns>An enumerable containing yielded tasks from the copy operation.</returns>
private static IEnumerable <Task> CopyStreamIteratorUnicodeToUtf8Encoding(System.IO.Stream input, System.IO.Stream output)
{
// Create two buffers. One will be used for the current read operation and one for the current
// write operation. We'll continually swap back and forth between them.
byte[][] buffers = new byte[2][] { new byte[BUFFER_SIZE], new byte[BUFFER_SIZE] };
int filledBufferNum = 0;
Task writeTask = null;
// Until there's no more data to be read
while (true)
{
// Read from the input asynchronously
var readTask = input.ReadAsync(buffers[filledBufferNum], 0, buffers[filledBufferNum].Length);
// If we have no pending write operations, just yield until the read operation has
// completed. If we have both a pending read and a pending write, yield until both the read
// and the write have completed.
if (writeTask == null)
{
yield return(readTask);
readTask.Wait(); // propagate any exception that may have occurred
}
else
{
var tasks = new[] { readTask, writeTask };
yield return(Task.Factory.WhenAll(tasks));
Task.WaitAll(tasks); // propagate any exceptions that may have occurred
}
// If no data was read, nothing more to do.
if (readTask.Result <= 0)
{
break;
}
// Otherwise, write the written data out to the file
writeTask = output.WriteAsyncUnicodeToUtf8Encoding(buffers[filledBufferNum], 0, readTask.Result);
// Swap buffers
filledBufferNum ^= 1;
}
}
/// <summary>
/// Creates an enumerable to be used with TaskFactoryExtensions.Iterate that reads data
/// from an input stream and passes it to a user-provided delegate.
/// </summary>
/// <param name="input">The source stream.</param>
/// <param name="bufferSize">The size of the buffers to be used.</param>
/// <param name="bufferAvailable">
/// A delegate to be invoked when a buffer is available (provided the
/// buffer and the number of bytes in the buffer starting at offset 0.
/// </param>
/// <returns>An enumerable containing yielded tasks from the operation.</returns>
private static IEnumerable <Task> ReadIterator(System.IO.Stream input, int bufferSize, Action <byte[], int> bufferAvailable)
{
// Create a buffer that will be used over and over
var buffer = new byte[bufferSize];
// Until there's no more data
while (true)
{
// Asynchronously read a buffer and yield until the operation completes
var readTask = input.ReadAsync(buffer, 0, buffer.Length);
yield return(readTask);
// If there's no more data in the stream, we're done.
if (readTask.Result <= 0)
{
break;
}
// Otherwise, hand the data off to the delegate
bufferAvailable(buffer, readTask.Result);
}
}
private static async Task VerifyPipeAsync(System.IO.Stream a, System.IO.Stream b)
{
var mes = new byte[1024];
new Random().NextBytes(mes);
mes[0] = 0x01;
var aw = a.WriteAsync(mes, 0, mes.Length);
var bw = b.WriteAsync(mes, 0, mes.Length);
await Task.WhenAll(aw, bw).ConfigureAwait(false);
var buf = new byte[mes.Length];
var n = await a.ReadAsync(buf, 0, buf.Length).ConfigureAwait(false);
Assert.Equal(n, buf.Length);
Assert.Equal(buf, mes);
n = await b.ReadAsync(buf, 0, buf.Length).ConfigureAwait(false);
Assert.Equal(n, buf.Length);
Assert.Equal(buf, mes);
}
public static Task <int> ReadAsync(this Stream stream, byte[] buffer)
{
return(stream.ReadAsync(buffer, 0, buffer.Length));
}
public static async Task <int> ReadAsync(this Stream stream, JasilyBuffer buffer) => await stream.ReadAsync(buffer.Buffer, buffer.Offset, buffer.Count);
public static IAsyncResult BeginRead(this Stream s, byte[] buffer, int offset, int count, AsyncCallback callback, object state)
{
return(s.ReadAsync(buffer, offset, count).ToApm <int>(callback, state));
}
public async Task LoadPreviewImage()
{
// Geting url for download
var httpClient = new System.Net.Http.HttpClient();
string fullPathFrom = AddBackslash(Path);
fullPathFrom += Name;
string url = "https://graph.microsoft.com/v1.0/me" + fullPathFrom + ":/thumbnails/0/medium";
var request = new System.Net.Http.HttpRequestMessage(HttpMethod.Get, url);
request.Version = Version.Parse("1.0");
request.Headers.Authorization =
new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", Account.Token);
System.Net.Http.HttpResponseMessage response = await httpClient.SendAsync(request);
string urlImage = null;
using (System.IO.Stream stream = await response.Content.ReadAsStreamAsync())
{
DeserializedImage deserializedImage = new DeserializedImage();
DataContractJsonSerializer ser = new DataContractJsonSerializer(deserializedImage.GetType());
deserializedImage = ser.ReadObject(stream) as DeserializedImage;
if (deserializedImage == null || String.IsNullOrEmpty(deserializedImage.Url))
{
throw new NullReferenceException("Couldn't deserialized the data");
}
urlImage = deserializedImage.Url;
}
// Download image
httpClient = new System.Net.Http.HttpClient();
request = new System.Net.Http.HttpRequestMessage(HttpMethod.Get, urlImage);
response = await httpClient.SendAsync(request);
using (var streamCopy = new MemoryStream())
{
using (System.IO.Stream stream = await response.Content.ReadAsStreamAsync())
{
Byte[] bytes = new Byte[1024];
int reader = 0;
do
{
reader = await stream.ReadAsync(bytes, 0, bytes.Length);
await streamCopy.WriteAsync(bytes, 0, reader);
} while (reader > 0);
await CoreApplication.MainView.Dispatcher.RunAsync(CoreDispatcherPriority.Low, async() =>
{
PreviewImage = new BitmapImage();
// ReSharper disable AccessToDisposedClosure
streamCopy.Seek(0, SeekOrigin.Begin);
await PreviewImage.SetSourceAsync(streamCopy.AsRandomAccessStream());
// ReSharper restore AccessToDisposedClosure
});
}
}
}
public static Task <int> ReadAsync(this Stream stream, byte[] buffer, CancellationToken cancellationToken)
{
return(stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken));
}
/// <summary>BufferedStream should be as thin a wrapper as possible. We want ReadAsync to delegate to
/// ReadAsync of the underlying _stream rather than calling the base Stream which implements the one in terms of the other.
/// This allows BufferedStream to affect the semantics of the stream it wraps as little as possible. </summary>
/// <returns>-2 if _bufferSize was set to 0 while waiting on the semaphore; otherwise num of bytes read.</returns>
private async Task <int> ReadFromUnderlyingStreamAsync(byte[] array, int offset, int count,
CancellationToken cancellationToken,
int bytesAlreadySatisfied,
Task semaphoreLockTask)
{
// Same conditions validated with exceptions in ReadAsync:
// (These should be Debug.Requires(..) but that method had some issues in async methods; using Assert(..) for now.)
Debug.Assert(array != null);
Debug.Assert(offset >= 0);
Debug.Assert(count >= 0);
Debug.Assert(array.Length - offset >= count);
Debug.Assert(_stream != null);
Debug.Assert(_stream.CanRead);
Debug.Assert(_bufferSize > 0);
Debug.Assert(semaphoreLockTask != null);
// Employ async waiting based on the same synchronization used in BeginRead of the abstract Stream.
await semaphoreLockTask.ConfigureAwait(false);
try
{
// The buffer might have been changed by another async task while we were waiting on the semaphore.
// Check it now again.
int bytesFromBuffer = ReadFromBuffer(array, offset, count);
if (bytesFromBuffer == count)
{
return(bytesAlreadySatisfied + bytesFromBuffer);
}
if (bytesFromBuffer > 0)
{
count -= bytesFromBuffer;
offset += bytesFromBuffer;
bytesAlreadySatisfied += bytesFromBuffer;
}
Debug.Assert(_readLen == _readPos);
_readPos = _readLen = 0;
// If there was anything in the write buffer, clear it.
if (_writePos > 0)
{
await FlushWriteAsync(cancellationToken).ConfigureAwait(false); // no Begin-End read version for Flush. Use Async.
}
// If the requested read is larger than buffer size, avoid the buffer and still use a single read:
if (count >= _bufferSize)
{
return(bytesAlreadySatisfied + await _stream.ReadAsync(array, offset, count, cancellationToken).ConfigureAwait(false));
}
// Ok. We can fill the buffer:
EnsureBufferAllocated();
_readLen = await _stream.ReadAsync(_buffer, 0, _bufferSize, cancellationToken).ConfigureAwait(false);
bytesFromBuffer = ReadFromBuffer(array, offset, count);
return(bytesAlreadySatisfied + bytesFromBuffer);
}
finally
{
SemaphoreSlim sem = LazyEnsureAsyncActiveSemaphoreInitialized();
sem.Release();
}
}
/// <summary>
/// Read remaining buffer from offset
/// </summary>
/// <param name="stream"></param>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="ct"></param>
/// <returns></returns>
public static Task <int> ReadAsync(this Stream stream, byte[] buffer, int offset,
CancellationToken ct)
{
return(stream.ReadAsync(buffer, offset, buffer.Length - offset, ct));
}
public static async Task <int> ReadAsync(this Stream stream, byte[] buffer, CancellationToken cancellationToken) => await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken);
} // ReadAsync_MemoryStream
internal static IAsyncOperationWithProgress <IBuffer, uint> ReadAsync_AbstractStream(Stream stream, IBuffer buffer, uint count,
InputStreamOptions options)
{
Debug.Assert(stream != null);
Debug.Assert(stream.CanRead);
Debug.Assert(buffer != null);
Debug.Assert(buffer is IBufferByteAccess);
Debug.Assert(0 <= count);
Debug.Assert(count <= int.MaxValue);
Debug.Assert(count <= buffer.Capacity);
Debug.Assert(options == InputStreamOptions.None || options == InputStreamOptions.Partial || options == InputStreamOptions.ReadAhead);
int bytesRequested = (int)count;
// Check if the buffer is our implementation.
// IF YES: In that case, we can read directly into its data array.
// IF NO: The buffer is of unknown implementation. It's not backed by a managed array, but the wrapped stream can only
// read into a managed array. If we used the user-supplied buffer we would need to copy data into it after every read.
// The spec allows to return a buffer instance that is not the same as passed by the user. So, we will create an own
// buffer instance, read data *directly* into the array backing it and then return it to the user.
// Note: the allocation costs we are paying for the new buffer are unavoidable anyway, as we we would need to create
// an array to read into either way.
IBuffer dataBuffer = buffer as WindowsRuntimeBuffer;
if (dataBuffer == null)
{
dataBuffer = WindowsRuntimeBuffer.Create((int)Math.Min((uint)int.MaxValue, buffer.Capacity));
}
// This operation delegate will we run inside of the returned IAsyncOperationWithProgress:
Func <CancellationToken, IProgress <uint>, Task <IBuffer> > readOperation = async(cancelToken, progressListener) =>
{
// No bytes read yet:
dataBuffer.Length = 0;
// Get the buffer backing array:
byte[] data;
int offset;
bool managedBufferAssert = dataBuffer.TryGetUnderlyingData(out data, out offset);
Debug.Assert(managedBufferAssert);
// Init tracking values:
bool done = cancelToken.IsCancellationRequested;
int bytesCompleted = 0;
// Loop until EOS, cancelled or read enough data according to options:
while (!done)
{
int bytesRead = 0;
try
{
// Read asynchronously:
bytesRead = await stream.ReadAsync(data, offset + bytesCompleted, bytesRequested - bytesCompleted, cancelToken)
.ConfigureAwait(continueOnCapturedContext: false);
// We will continue here on a different thread when read async completed:
bytesCompleted += bytesRead;
// We will handle a cancelation exception and re-throw all others:
}
catch (OperationCanceledException)
{
// We assume that cancelToken.IsCancellationRequested is has been set and simply proceed.
// (we check cancelToken.IsCancellationRequested later)
Debug.Assert(cancelToken.IsCancellationRequested);
// This is because if the cancellation came after we read some bytes we want to return the results we got instead
// of an empty cancelled task, so if we have not yet read anything at all, then we can throw cancellation:
if (bytesCompleted == 0 && bytesRead == 0)
{
throw;
}
}
// Update target buffer:
dataBuffer.Length = (uint)bytesCompleted;
Debug.Assert(bytesCompleted <= bytesRequested);
// Check if we are done:
done = options == InputStreamOptions.Partial || // If no complete read was requested, any amount of data is OK
bytesRead == 0 || // this implies EndOfStream
bytesCompleted == bytesRequested || // read all requested bytes
cancelToken.IsCancellationRequested; // operation was cancelled
// Call user Progress handler:
if (progressListener != null)
{
progressListener.Report(dataBuffer.Length);
}
} // while (!done)
// If we got here, then no error was detected. Return the results buffer:
return(dataBuffer);
}; // readOperation
return(AsyncInfo.Run <IBuffer, UInt32>(readOperation));
} // ReadAsync_AbstractStream
private Task <int> InternalReadAsync(byte[] buffer, int offset, int count)
{
return(stream.ReadAsync(buffer, offset, count));
}
public async Task DownloadData()
{
using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36");
try
{
const long TimeoutLimit = 10000;
CancellationTokenSource.Token.ThrowIfCancellationRequested();
HttpResponseMessage message = await client.GetAsync(_link, HttpCompletionOption.ResponseHeadersRead);
long? totalLength = message.Content.Headers.ContentLength;
System.IO.Stream stream = await message.Content.ReadAsStreamAsync();
_tempFile = System.IO.Path.GetTempFileName();
AddRollbackOperation(() =>
System.IO.File.Delete(_tempFile));
System.IO.FileStream fsStream = new System.IO.FileStream(_tempFile, System.IO.FileMode.Create);
AddRollbackOperation(() =>
{
if (fsStream.CanRead || fsStream.CanWrite)
{
fsStream.Close();
}
});
byte[] buffer = new byte[8192];
long currentLength = 0;
int len = 0;
bool finished = false;
System.Threading.CancellationTokenSource cancSrc =
new System.Threading.CancellationTokenSource();
DateTime time = DateTime.Now;
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
Task timeoutTask = Task.Run(async() =>
{
while (!finished)
{
if ((DateTime.Now - time).TotalMilliseconds > TimeoutLimit)
{
cancSrc.Cancel();
stream.Close();
break;
}
else
{
await Task.Delay(1);
}
}
});
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
while ((len = await stream.ReadAsync(buffer, 0, buffer.Length, cancSrc.Token)) > 0)
{
if (timeoutTask.IsCompleted)
{
timeoutTask.Start();
}
time = DateTime.Now;
CancellationTokenSource.Token.ThrowIfCancellationRequested();
fsStream.Write(buffer, 0, len);
currentLength += len;
double percentage = (double)currentLength / (totalLength ?? -currentLength) * 5500;
Percentage = _previousPercentage + ((percentage > 0) ? (int)percentage : 0);
}
finished = true;
Percentage = 7500;
fsStream.Close();
}
catch (HttpRequestException)
{
System.Windows.Forms.MessageBox.Show("Cannot download program data. Please, check your internet connection.", "Error", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
await OperationsRollback();
Environment.Exit(-1);
}
catch (ObjectDisposedException)
{
System.Windows.Forms.MessageBox.Show("Cannot download program data. Please, check your internet connection.", "Error", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
await OperationsRollback();
Environment.Exit(-1);
}
catch (System.OperationCanceledException)
{
await OperationsRollback();
Environment.Exit(0);
}
catch (Exception e)
{
System.Windows.Forms.MessageBox.Show("Oops, that's so embarrassing... An error occurred: " + e.ToString(), "Error", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
CurrentDescription = "Operations rollback...";
await OperationsRollback();
Environment.Exit(e.HResult);
}
}
}
/// <summary>
/// 获取Stream的Base64字符串
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static async Task<string> GetBase64StringAsync(Stream stream)
{
byte[] arr = new byte[stream.Length];
stream.Position = 0;
await stream.ReadAsync(arr, 0, (int)stream.Length);
return Convert.ToBase64String(arr, Base64FormattingOptions.None);
}
