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io: add ReadBuf::take (#2817)

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Signed-off-by: Zahari Dichev <zaharidichev@gmail.com>
This commit is contained in:
Zahari Dichev 2020-09-05 21:09:54 +03:00 committed by GitHub
parent c9f5bc2915
commit 171cb57fa1
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2 changed files with 9 additions and 4 deletions
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8
tokio/src/io/read_buf.rs
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@ -77,6 +77,14 @@ impl<'a> ReadBuf<'a> {
unsafe { mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(slice) } unsafe { mem::transmute::<&mut [MaybeUninit<u8>], &mut [u8]>(slice) }
} }
/// Returns a new `ReadBuf` comprised of the unfilled section up to `n`.
#[inline]
pub fn take(&mut self, n: usize) -> ReadBuf<'_> {
let max = std::cmp::min(self.remaining(), n);
// Saftey: We don't set any of the `unfilled_mut` with `MaybeUninit::uninit`.
unsafe { ReadBuf::uninit(&mut self.unfilled_mut()[..max]) }
}
/// Returns a shared reference to the initialized portion of the buffer. /// Returns a shared reference to the initialized portion of the buffer.
/// ///
/// This includes the filled portion. /// This includes the filled portion.

5
tokio/src/io/util/take.rs
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@ -85,10 +85,7 @@ impl<R: AsyncRead> AsyncRead for Take<R> {
} }
let me = self.project(); let me = self.project();
let max = std::cmp::min(buf.remaining() as u64, *me.limit_) as usize; let mut b = buf.take(*me.limit_ as usize);
// Make a ReadBuf of the unfulled section up to max
// Saftey: We don't set any of the `unfilled_mut` with `MaybeUninit::uninit`.
let mut b = unsafe { ReadBuf::uninit(&mut buf.unfilled_mut()[..max]) };
ready!(me.inner.poll_read(cx, &mut b))?; ready!(me.inner.poll_read(cx, &mut b))?;
let n = b.filled().len(); let n = b.filled().len();