Sha256: 354507ce95242a735940f0aaa6ef11cc7d6d0505ae148f05277ce6e7537f168a
Contents?: true
Size: 1.77 KB
Versions: 22
Compression:
Stored size: 1.77 KB
Contents
use futures_core::future::Future;
use futures_core::ready;
use futures_core::task::{Context, Poll};
use futures_io::AsyncBufRead;
use std::io;
use std::mem;
use std::pin::Pin;
/// Future for the [`read_until`](super::AsyncBufReadExt::read_until) method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct ReadUntil<'a, R: ?Sized> {
reader: &'a mut R,
byte: u8,
buf: &'a mut Vec<u8>,
read: usize,
}
impl<R: ?Sized + Unpin> Unpin for ReadUntil<'_, R> {}
impl<'a, R: AsyncBufRead + ?Sized + Unpin> ReadUntil<'a, R> {
pub(super) fn new(reader: &'a mut R, byte: u8, buf: &'a mut Vec<u8>) -> Self {
Self { reader, byte, buf, read: 0 }
}
}
pub(super) fn read_until_internal<R: AsyncBufRead + ?Sized>(
mut reader: Pin<&mut R>,
cx: &mut Context<'_>,
byte: u8,
buf: &mut Vec<u8>,
read: &mut usize,
) -> Poll<io::Result<usize>> {
loop {
let (done, used) = {
let available = ready!(reader.as_mut().poll_fill_buf(cx))?;
if let Some(i) = memchr::memchr(byte, available) {
buf.extend_from_slice(&available[..=i]);
(true, i + 1)
} else {
buf.extend_from_slice(available);
(false, available.len())
}
};
reader.as_mut().consume(used);
*read += used;
if done || used == 0 {
return Poll::Ready(Ok(mem::replace(read, 0)));
}
}
}
impl<R: AsyncBufRead + ?Sized + Unpin> Future for ReadUntil<'_, R> {
type Output = io::Result<usize>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let Self { reader, byte, buf, read } = &mut *self;
read_until_internal(Pin::new(reader), cx, *byte, buf, read)
}
}
Version data entries
22 entries across 22 versions & 1 rubygems