1 // Copyright (c) 2016 Sandstorm Development Group, Inc. and contributors
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
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7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 // THE SOFTWARE.
20 
21 use std::io;
22 use futures::future::Future;
23 use futures::stream::Stream;
24 use futures::{Async, Poll};
25 
26 use capnp::{Error, message};
27 
28 #[must_use = "streams do nothing unless polled"]
29 pub struct ReadStream<R> where R: io::Read {
30     options: message::ReaderOptions,
31     read: ::serialize::Read<R>,
32 }
33 
34 impl <R> ReadStream<R> where R: io::Read {
new(reader: R, options: message::ReaderOptions) -> ReadStream<R>35     pub fn new(reader: R, options: message::ReaderOptions) -> ReadStream<R> {
36         ReadStream {
37             read: ::serialize::read_message(reader, options),
38             options: options,
39         }
40     }
41 }
42 
43 impl <R> Stream for ReadStream<R> where R: io::Read {
44     type Item = message::Reader<::serialize::OwnedSegments>;
45     type Error = Error;
46 
poll(&mut self) -> Poll<Option<Self::Item>, Error>47     fn poll(&mut self) -> Poll<Option<Self::Item>, Error> {
48         let (r, m) = try_ready!(Future::poll(&mut self.read));
49         self.read = ::serialize::read_message(r, self.options);
50         Ok(Async::Ready(m))
51     }
52 }
53