2018-09-12 17:26:21 +00:00
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using System.IO;
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using System.Threading;
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using System;
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using System.Threading.Tasks;
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using MediaBrowser.Model.IO;
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namespace Emby.Server.Implementations.IO
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{
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public class StreamHelper : IStreamHelper
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{
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public async Task CopyToAsync(Stream source, Stream destination, int bufferSize, Action onStarted, CancellationToken cancellationToken)
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{
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byte[] buffer = new byte[bufferSize];
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int read;
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while ((read = source.Read(buffer, 0, buffer.Length)) != 0)
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{
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cancellationToken.ThrowIfCancellationRequested();
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await destination.WriteAsync(buffer, 0, read).ConfigureAwait(false);
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if (onStarted != null)
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{
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onStarted();
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onStarted = null;
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}
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}
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}
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public async Task CopyToAsync(Stream source, Stream destination, int bufferSize, int emptyReadLimit, CancellationToken cancellationToken)
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{
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byte[] buffer = new byte[bufferSize];
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if (emptyReadLimit <= 0)
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{
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int read;
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while ((read = source.Read(buffer, 0, buffer.Length)) != 0)
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{
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cancellationToken.ThrowIfCancellationRequested();
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await destination.WriteAsync(buffer, 0, read).ConfigureAwait(false);
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}
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return;
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}
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var eofCount = 0;
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while (eofCount < emptyReadLimit)
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{
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cancellationToken.ThrowIfCancellationRequested();
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var bytesRead = source.Read(buffer, 0, buffer.Length);
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if (bytesRead == 0)
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{
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eofCount++;
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await Task.Delay(50, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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eofCount = 0;
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await destination.WriteAsync(buffer, 0, bytesRead).ConfigureAwait(false);
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}
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}
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}
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const int StreamCopyToBufferSize = 81920;
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public async Task<int> CopyToAsync(Stream source, Stream destination, CancellationToken cancellationToken)
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{
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var array = new byte[StreamCopyToBufferSize];
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int bytesRead;
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int totalBytesRead = 0;
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while ((bytesRead = await source.ReadAsync(array, 0, array.Length, cancellationToken).ConfigureAwait(false)) != 0)
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{
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var bytesToWrite = bytesRead;
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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totalBytesRead += bytesRead;
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}
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}
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return totalBytesRead;
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}
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public async Task<int> CopyToAsyncWithSyncRead(Stream source, Stream destination, CancellationToken cancellationToken)
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{
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var array = new byte[StreamCopyToBufferSize];
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int bytesRead;
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int totalBytesRead = 0;
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while ((bytesRead = source.Read(array, 0, array.Length)) != 0)
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{
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var bytesToWrite = bytesRead;
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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totalBytesRead += bytesRead;
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}
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}
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return totalBytesRead;
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}
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public async Task CopyToAsyncWithSyncRead(Stream source, Stream destination, long copyLength, CancellationToken cancellationToken)
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{
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var array = new byte[StreamCopyToBufferSize];
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int bytesRead;
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while ((bytesRead = source.Read(array, 0, array.Length)) != 0)
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{
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var bytesToWrite = Math.Min(bytesRead, copyLength);
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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}
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copyLength -= bytesToWrite;
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if (copyLength <= 0)
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{
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break;
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}
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}
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}
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public async Task CopyToAsync(Stream source, Stream destination, long copyLength, CancellationToken cancellationToken)
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{
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var array = new byte[StreamCopyToBufferSize];
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int bytesRead;
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while ((bytesRead = await source.ReadAsync(array, 0, array.Length, cancellationToken).ConfigureAwait(false)) != 0)
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{
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var bytesToWrite = Math.Min(bytesRead, copyLength);
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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}
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copyLength -= bytesToWrite;
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if (copyLength <= 0)
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{
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break;
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}
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}
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}
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public async Task CopyUntilCancelled(Stream source, Stream target, int bufferSize, CancellationToken cancellationToken)
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{
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byte[] buffer = new byte[bufferSize];
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while (!cancellationToken.IsCancellationRequested)
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{
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var bytesRead = await CopyToAsyncInternal(source, target, buffer, cancellationToken).ConfigureAwait(false);
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//var position = fs.Position;
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2018-12-13 13:18:25 +00:00
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//_logger.LogDebug("Streamed {0} bytes to position {1} from file {2}", bytesRead, position, path);
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2018-09-12 17:26:21 +00:00
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if (bytesRead == 0)
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{
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await Task.Delay(100).ConfigureAwait(false);
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}
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}
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}
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private static async Task<int> CopyToAsyncInternal(Stream source, Stream destination, byte[] buffer, CancellationToken cancellationToken)
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{
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int bytesRead;
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int totalBytesRead = 0;
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while ((bytesRead = await source.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false)) != 0)
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{
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await destination.WriteAsync(buffer, 0, bytesRead).ConfigureAwait(false);
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totalBytesRead += bytesRead;
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}
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return totalBytesRead;
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}
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}
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}
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