Merge pull request #1593 from kumpera/new_suspend
[mono.git] / mcs / class / System.Net.Http / System.Net.Http / StreamContent.cs
1 //
2 // StreamContent.cs
3 //
4 // Authors:
5 //      Marek Safar  <marek.safar@gmail.com>
6 //
7 // Copyright (C) 2011 Xamarin Inc (http://www.xamarin.com)
8 //
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 //
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 //
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28
29 using System.IO;
30 using System.Threading;
31 using System.Threading.Tasks;
32
33 namespace System.Net.Http
34 {
35         public class StreamContent : HttpContent
36         {
37                 readonly Stream content;
38                 readonly int bufferSize;
39                 readonly CancellationToken cancellationToken;
40
41                 public StreamContent (Stream content)
42                         : this (content, 16 * 1024)
43                 {
44                 }
45
46                 public StreamContent (Stream content, int bufferSize)
47                 {
48                         if (content == null)
49                                 throw new ArgumentNullException ("content");
50
51                         if (bufferSize <= 0)
52                                 throw new ArgumentOutOfRangeException ("bufferSize");
53
54                         this.content = content;
55                         this.bufferSize = bufferSize;
56                 }
57
58                 //
59                 // Workarounds for poor .NET API
60                 // Instead of having SerializeToStreamAsync with CancellationToken as public API. Only LoadIntoBufferAsync
61                 // called internally from the send worker can be cancelled and user cannot see/do it
62                 //
63                 internal StreamContent (Stream content, CancellationToken cancellationToken)
64                         : this (content)
65                 {
66                         // We don't own the token so don't worry about disposing it
67                         this.cancellationToken = cancellationToken;
68                 }
69
70                 protected override Task<Stream> CreateContentReadStreamAsync ()
71                 {
72                         return Task.FromResult (content);
73                 }
74
75                 protected override void Dispose (bool disposing)
76                 {
77                         if (disposing) {
78                                 content.Dispose ();
79                         }
80
81                         base.Dispose (disposing);
82                 }
83
84                 protected internal override Task SerializeToStreamAsync (Stream stream, TransportContext context)
85                 {
86                         return content.CopyToAsync (stream, bufferSize, cancellationToken);
87                 }
88
89                 protected internal override bool TryComputeLength (out long length)
90                 {
91                         if (!content.CanSeek) {
92                                 length = 0;
93                                 return false;
94                         }
95                         length = content.Length;
96                         return true;
97                 }
98         }
99 }