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io: implement AsyncBufRead for &[u8] and Cursor (#1397)

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* `impl AsyncRead for &[u8]`
* `impl AsyncBufRead for &[u8]`
* `impl<T: AsRef<[u8]> + Unpin> AsyncRead for Cursor<T>`
* `impl<T: AsRef<[u8]> + Unpin> AsyncBufRead for Cursor<T>`
This commit is contained in:
tmiasko
2019-08-07 12:57:37 -07:00
committed by Carl Lerche
parent 7174c63bf9
commit 53a94c025d
8 changed files with 67 additions and 185 deletions
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tokio-io/src/async_read.rs
+28
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@@ -155,3 +155,31 @@ where
self.get_mut().as_mut().poll_read(cx, buf)
}
}
impl AsyncRead for &[u8] {
unsafe fn prepare_uninitialized_buffer(&self, _buf: &mut [u8]) -> bool {
false
}
fn poll_read(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
Poll::Ready(io::Read::read(self.get_mut(), buf))
}
}
impl<T: AsRef<[u8]> + Unpin> AsyncRead for io::Cursor<T> {
unsafe fn prepare_uninitialized_buffer(&self, _buf: &mut [u8]) -> bool {
false
}
fn poll_read(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
Poll::Ready(io::Read::read(self.get_mut(), buf))
}
}