108 lines
2.9 KiB
Rust
108 lines
2.9 KiB
Rust
#[cfg_attr(not(feature = "all-implementations"), allow(unused))]
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use std::{
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io::Result,
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pin::Pin,
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task::{Context, Poll},
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};
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pub struct TrackEof<R> {
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inner: R,
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eof: bool,
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}
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impl<R: Unpin> TrackEof<R> {
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pub fn new(inner: R) -> Self {
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Self { inner, eof: false }
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}
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pub fn project(self: Pin<&mut Self>) -> (Pin<&mut R>, &mut bool) {
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let Self { inner, eof } = Pin::into_inner(self);
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(Pin::new(inner), eof)
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}
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}
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#[cfg(feature = "futures-io")]
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impl<R: futures::io::AsyncRead + Unpin> futures::io::AsyncRead for TrackEof<R> {
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fn poll_read(
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self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut [u8],
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) -> Poll<Result<usize>> {
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let (inner, eof) = self.project();
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assert!(!*eof);
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match inner.poll_read(cx, buf) {
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Poll::Ready(Ok(0)) => {
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if !buf.is_empty() {
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*eof = true;
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}
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Poll::Ready(Ok(0))
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}
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other => other,
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}
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}
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}
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#[cfg(feature = "futures-io")]
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impl<R: futures::io::AsyncBufRead + Unpin> futures::io::AsyncBufRead for TrackEof<R> {
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fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<&[u8]>> {
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let (inner, eof) = self.project();
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assert!(!*eof);
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match inner.poll_fill_buf(cx) {
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Poll::Ready(Ok(buf)) => {
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if buf.is_empty() {
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*eof = true;
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}
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Poll::Ready(Ok(buf))
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}
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other => other,
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}
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}
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fn consume(self: Pin<&mut Self>, amt: usize) {
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self.project().0.consume(amt)
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}
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}
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#[cfg(feature = "tokio")]
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impl<R: tokio::io::AsyncRead + Unpin> tokio::io::AsyncRead for TrackEof<R> {
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fn poll_read(
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self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut tokio::io::ReadBuf<'_>,
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) -> Poll<Result<()>> {
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let (inner, eof) = self.project();
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assert!(!*eof);
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let len = buf.filled().len();
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match inner.poll_read(cx, buf) {
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Poll::Ready(Ok(())) => {
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if buf.filled().len() == len && buf.remaining() > 0 {
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*eof = true;
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}
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Poll::Ready(Ok(()))
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}
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other => other,
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}
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}
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}
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#[cfg(feature = "tokio")]
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impl<R: tokio::io::AsyncBufRead + Unpin> tokio::io::AsyncBufRead for TrackEof<R> {
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fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<&[u8]>> {
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let (inner, eof) = self.project();
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assert!(!*eof);
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match inner.poll_fill_buf(cx) {
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Poll::Ready(Ok(buf)) => {
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if buf.is_empty() {
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*eof = true;
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}
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Poll::Ready(Ok(buf))
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}
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other => other,
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}
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}
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fn consume(self: Pin<&mut Self>, amt: usize) {
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self.project().0.consume(amt)
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}
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}
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