1 files changed, 83 insertions, 1 deletions
diff --git a/SocketHttpListener.Portable/Net/ResponseStream.cs b/SocketHttpListener.Portable/Net/ResponseStream.cs
index a79a18791..3c79f47c2 100644
--- a/SocketHttpListener.Portable/Net/ResponseStream.cs
+++ b/SocketHttpListener.Portable/Net/ResponseStream.cs
@@ -5,6 +5,7 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Model.IO;
+using MediaBrowser.Model.Net;
 using MediaBrowser.Model.Text;
 using SocketHttpListener.Primitives;
 
@@ -22,12 +23,18 @@ namespace SocketHttpListener.Net
         Stream stream;
         private readonly IMemoryStreamFactory _memoryStreamFactory;
         private readonly ITextEncoding _textEncoding;
+        private readonly IFileSystem _fileSystem;
+        private readonly IAcceptSocket _socket;
+        private readonly bool _supportsDirectSocketAccess;
 
-        internal ResponseStream(Stream stream, HttpListenerResponse response, IMemoryStreamFactory memoryStreamFactory, ITextEncoding textEncoding)
+        internal ResponseStream(Stream stream, HttpListenerResponse response, IMemoryStreamFactory memoryStreamFactory, ITextEncoding textEncoding, IFileSystem fileSystem, IAcceptSocket socket, bool supportsDirectSocketAccess)
         {
             this.response = response;
             _memoryStreamFactory = memoryStreamFactory;
             _textEncoding = textEncoding;
+            _fileSystem = fileSystem;
+            _socket = socket;
+            _supportsDirectSocketAccess = supportsDirectSocketAccess;
             this.stream = stream;
         }
 
@@ -299,5 +306,80 @@ namespace SocketHttpListener.Net
         {
             throw new NotSupportedException();
         }
+
+        public Task TransmitFile(string path, long offset, long count, FileShareMode fileShareMode, CancellationToken cancellationToken)
+        {
+            //if (_supportsDirectSocketAccess && offset == 0 && count == 0 && !response.SendChunked)
+            //{
+            //    return TransmitFileOverSocket(path, offset, count, cancellationToken);
+            //}
+            return TransmitFileManaged(path, offset, count, fileShareMode, cancellationToken);
+        }
+
+        private readonly byte[] _emptyBuffer = new byte[] { };
+        private async Task TransmitFileOverSocket(string path, long offset, long count, CancellationToken cancellationToken)
+        {
+            MemoryStream ms = GetHeaders(response, _memoryStreamFactory, false);
+
+            var buffer = new byte[] {};
+            if (ms != null)
+            {
+                ms.Position = 0;
+
+                byte[] msBuffer;
+                _memoryStreamFactory.TryGetBuffer(ms, out msBuffer);
+                buffer = msBuffer;
+            }
+
+            await _socket.SendFile(path, buffer, _emptyBuffer, cancellationToken).ConfigureAwait(false);
+        }
+
+        private async Task TransmitFileManaged(string path, long offset, long count, FileShareMode fileShareMode, CancellationToken cancellationToken)
+        {
+            var chunked = response.SendChunked;
+
+            if (!chunked)
+            {
+                await WriteAsync(_emptyBuffer, 0, 0, cancellationToken).ConfigureAwait(false);
+            }
+
+            using (var fs = _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, fileShareMode, true))
+            {
+                if (offset > 0)
+                {
+                    fs.Position = offset;
+                }
+
+                var targetStream = chunked ? this : stream;
+
+                if (count > 0)
+                {
+                    await CopyToInternalAsync(fs, targetStream, count, cancellationToken).ConfigureAwait(false);
+                }
+                else
+                {
+                    await fs.CopyToAsync(targetStream, 81920, cancellationToken).ConfigureAwait(false);
+                }
+            }
+        }
+
+        private static async Task CopyToInternalAsync(Stream source, Stream destination, long copyLength, CancellationToken cancellationToken)
+        {
+            var array = new byte[81920];
+            int count;
+            while ((count = await source.ReadAsync(array, 0, array.Length, cancellationToken).ConfigureAwait(false)) != 0)
+            {
+                var bytesToCopy = Math.Min(count, copyLength);
+
+                await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToCopy), cancellationToken).ConfigureAwait(false);
+
+                copyLength -= bytesToCopy;
+
+                if (copyLength <= 0)
+                {
+                    break;
+                }
+            }
+        }
     }
 }