chore: add vendor directory

3 files changed, 796 insertions, 0 deletions

diff --git a/vendor/hyper/src/body/incoming.rs b/vendor/hyper/src/body/incoming.rs
new file mode 100644
index 00000000..dcfb71d5
--- /dev/null
+++ b/vendor/hyper/src/body/incoming.rs
@@ -0,0 +1,617 @@
+use std::fmt;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use bytes::Bytes;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+use futures_channel::{mpsc, oneshot};
+#[cfg(all(
+    any(feature = "http1", feature = "http2"),
+    any(feature = "client", feature = "server")
+))]
+use futures_util::ready;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+use futures_util::{stream::FusedStream, Stream}; // for mpsc::Receiver
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+use http::HeaderMap;
+use http_body::{Body, Frame, SizeHint};
+
+#[cfg(all(
+    any(feature = "http1", feature = "http2"),
+    any(feature = "client", feature = "server")
+))]
+use super::DecodedLength;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+use crate::common::watch;
+#[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+use crate::proto::h2::ping;
+
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+type BodySender = mpsc::Sender<Result<Bytes, crate::Error>>;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+type TrailersSender = oneshot::Sender<HeaderMap>;
+
+/// A stream of `Bytes`, used when receiving bodies from the network.
+///
+/// Note that Users should not instantiate this struct directly. When working with the hyper client,
+/// `Incoming` is returned to you in responses. Similarly, when operating with the hyper server,
+/// it is provided within requests.
+///
+/// # Examples
+///
+/// ```rust,ignore
+/// async fn echo(
+///    req: Request<hyper::body::Incoming>,
+/// ) -> Result<Response<BoxBody<Bytes, hyper::Error>>, hyper::Error> {
+///    //Here, you can process `Incoming`
+/// }
+/// ```
+#[must_use = "streams do nothing unless polled"]
+pub struct Incoming {
+    kind: Kind,
+}
+
+enum Kind {
+    Empty,
+    #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+    Chan {
+        content_length: DecodedLength,
+        want_tx: watch::Sender,
+        data_rx: mpsc::Receiver<Result<Bytes, crate::Error>>,
+        trailers_rx: oneshot::Receiver<HeaderMap>,
+    },
+    #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+    H2 {
+        content_length: DecodedLength,
+        data_done: bool,
+        ping: ping::Recorder,
+        recv: h2::RecvStream,
+    },
+    #[cfg(feature = "ffi")]
+    Ffi(crate::ffi::UserBody),
+}
+
+/// A sender half created through [`Body::channel()`].
+///
+/// Useful when wanting to stream chunks from another thread.
+///
+/// ## Body Closing
+///
+/// Note that the request body will always be closed normally when the sender is dropped (meaning
+/// that the empty terminating chunk will be sent to the remote). If you desire to close the
+/// connection with an incomplete response (e.g. in the case of an error during asynchronous
+/// processing), call the [`Sender::abort()`] method to abort the body in an abnormal fashion.
+///
+/// [`Body::channel()`]: struct.Body.html#method.channel
+/// [`Sender::abort()`]: struct.Sender.html#method.abort
+#[must_use = "Sender does nothing unless sent on"]
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+pub(crate) struct Sender {
+    want_rx: watch::Receiver,
+    data_tx: BodySender,
+    trailers_tx: Option<TrailersSender>,
+}
+
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+const WANT_PENDING: usize = 1;
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+const WANT_READY: usize = 2;
+
+impl Incoming {
+    /// Create a `Body` stream with an associated sender half.
+    ///
+    /// Useful when wanting to stream chunks from another thread.
+    #[inline]
+    #[cfg(test)]
+    pub(crate) fn channel() -> (Sender, Incoming) {
+        Self::new_channel(DecodedLength::CHUNKED, /*wanter =*/ false)
+    }
+
+    #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+    pub(crate) fn new_channel(content_length: DecodedLength, wanter: bool) -> (Sender, Incoming) {
+        let (data_tx, data_rx) = mpsc::channel(0);
+        let (trailers_tx, trailers_rx) = oneshot::channel();
+
+        // If wanter is true, `Sender::poll_ready()` won't becoming ready
+        // until the `Body` has been polled for data once.
+        let want = if wanter { WANT_PENDING } else { WANT_READY };
+
+        let (want_tx, want_rx) = watch::channel(want);
+
+        let tx = Sender {
+            want_rx,
+            data_tx,
+            trailers_tx: Some(trailers_tx),
+        };
+        let rx = Incoming::new(Kind::Chan {
+            content_length,
+            want_tx,
+            data_rx,
+            trailers_rx,
+        });
+
+        (tx, rx)
+    }
+
+    fn new(kind: Kind) -> Incoming {
+        Incoming { kind }
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn empty() -> Incoming {
+        Incoming::new(Kind::Empty)
+    }
+
+    #[cfg(feature = "ffi")]
+    pub(crate) fn ffi() -> Incoming {
+        Incoming::new(Kind::Ffi(crate::ffi::UserBody::new()))
+    }
+
+    #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+    pub(crate) fn h2(
+        recv: h2::RecvStream,
+        mut content_length: DecodedLength,
+        ping: ping::Recorder,
+    ) -> Self {
+        // If the stream is already EOS, then the "unknown length" is clearly
+        // actually ZERO.
+        if !content_length.is_exact() && recv.is_end_stream() {
+            content_length = DecodedLength::ZERO;
+        }
+
+        Incoming::new(Kind::H2 {
+            data_done: false,
+            ping,
+            content_length,
+            recv,
+        })
+    }
+
+    #[cfg(feature = "ffi")]
+    pub(crate) fn as_ffi_mut(&mut self) -> &mut crate::ffi::UserBody {
+        match self.kind {
+            Kind::Ffi(ref mut body) => return body,
+            _ => {
+                self.kind = Kind::Ffi(crate::ffi::UserBody::new());
+            }
+        }
+
+        match self.kind {
+            Kind::Ffi(ref mut body) => body,
+            _ => unreachable!(),
+        }
+    }
+}
+
+impl Body for Incoming {
+    type Data = Bytes;
+    type Error = crate::Error;
+
+    fn poll_frame(
+        #[cfg_attr(
+            not(all(
+                any(feature = "http1", feature = "http2"),
+                any(feature = "client", feature = "server")
+            )),
+            allow(unused_mut)
+        )]
+        mut self: Pin<&mut Self>,
+        #[cfg_attr(
+            not(all(
+                any(feature = "http1", feature = "http2"),
+                any(feature = "client", feature = "server")
+            )),
+            allow(unused_variables)
+        )]
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
+        match self.kind {
+            Kind::Empty => Poll::Ready(None),
+            #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+            Kind::Chan {
+                content_length: ref mut len,
+                ref mut data_rx,
+                ref mut want_tx,
+                ref mut trailers_rx,
+            } => {
+                want_tx.send(WANT_READY);
+
+                if !data_rx.is_terminated() {
+                    if let Some(chunk) = ready!(Pin::new(data_rx).poll_next(cx)?) {
+                        len.sub_if(chunk.len() as u64);
+                        return Poll::Ready(Some(Ok(Frame::data(chunk))));
+                    }
+                }
+
+                // check trailers after data is terminated
+                match ready!(Pin::new(trailers_rx).poll(cx)) {
+                    Ok(t) => Poll::Ready(Some(Ok(Frame::trailers(t)))),
+                    Err(_) => Poll::Ready(None),
+                }
+            }
+            #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+            Kind::H2 {
+                ref mut data_done,
+                ref ping,
+                recv: ref mut h2,
+                content_length: ref mut len,
+            } => {
+                if !*data_done {
+                    match ready!(h2.poll_data(cx)) {
+                        Some(Ok(bytes)) => {
+                            let _ = h2.flow_control().release_capacity(bytes.len());
+                            len.sub_if(bytes.len() as u64);
+                            ping.record_data(bytes.len());
+                            return Poll::Ready(Some(Ok(Frame::data(bytes))));
+                        }
+                        Some(Err(e)) => {
+                            return match e.reason() {
+                                // These reasons should cause the body reading to stop, but not fail it.
+                                // The same logic as for `Read for H2Upgraded` is applied here.
+                                Some(h2::Reason::NO_ERROR) | Some(h2::Reason::CANCEL) => {
+                                    Poll::Ready(None)
+                                }
+                                _ => Poll::Ready(Some(Err(crate::Error::new_body(e)))),
+                            };
+                        }
+                        None => {
+                            *data_done = true;
+                            // fall through to trailers
+                        }
+                    }
+                }
+
+                // after data, check trailers
+                match ready!(h2.poll_trailers(cx)) {
+                    Ok(t) => {
+                        ping.record_non_data();
+                        Poll::Ready(Ok(t.map(Frame::trailers)).transpose())
+                    }
+                    Err(e) => Poll::Ready(Some(Err(crate::Error::new_h2(e)))),
+                }
+            }
+
+            #[cfg(feature = "ffi")]
+            Kind::Ffi(ref mut body) => body.poll_data(cx),
+        }
+    }
+
+    fn is_end_stream(&self) -> bool {
+        match self.kind {
+            Kind::Empty => true,
+            #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+            Kind::Chan { content_length, .. } => content_length == DecodedLength::ZERO,
+            #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+            Kind::H2 { recv: ref h2, .. } => h2.is_end_stream(),
+            #[cfg(feature = "ffi")]
+            Kind::Ffi(..) => false,
+        }
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        #[cfg(all(
+            any(feature = "http1", feature = "http2"),
+            any(feature = "client", feature = "server")
+        ))]
+        fn opt_len(decoded_length: DecodedLength) -> SizeHint {
+            if let Some(content_length) = decoded_length.into_opt() {
+                SizeHint::with_exact(content_length)
+            } else {
+                SizeHint::default()
+            }
+        }
+
+        match self.kind {
+            Kind::Empty => SizeHint::with_exact(0),
+            #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+            Kind::Chan { content_length, .. } => opt_len(content_length),
+            #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
+            Kind::H2 { content_length, .. } => opt_len(content_length),
+            #[cfg(feature = "ffi")]
+            Kind::Ffi(..) => SizeHint::default(),
+        }
+    }
+}
+
+impl fmt::Debug for Incoming {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(any(
+            all(
+                any(feature = "http1", feature = "http2"),
+                any(feature = "client", feature = "server")
+            ),
+            feature = "ffi"
+        ))]
+        #[derive(Debug)]
+        struct Streaming;
+        #[derive(Debug)]
+        struct Empty;
+
+        let mut builder = f.debug_tuple("Body");
+        match self.kind {
+            Kind::Empty => builder.field(&Empty),
+            #[cfg(any(
+                all(
+                    any(feature = "http1", feature = "http2"),
+                    any(feature = "client", feature = "server")
+                ),
+                feature = "ffi"
+            ))]
+            _ => builder.field(&Streaming),
+        };
+
+        builder.finish()
+    }
+}
+
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+impl Sender {
+    /// Check to see if this `Sender` can send more data.
+    pub(crate) fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        // Check if the receiver end has tried polling for the body yet
+        ready!(self.poll_want(cx)?);
+        self.data_tx
+            .poll_ready(cx)
+            .map_err(|_| crate::Error::new_closed())
+    }
+
+    fn poll_want(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        match self.want_rx.load(cx) {
+            WANT_READY => Poll::Ready(Ok(())),
+            WANT_PENDING => Poll::Pending,
+            watch::CLOSED => Poll::Ready(Err(crate::Error::new_closed())),
+            unexpected => unreachable!("want_rx value: {}", unexpected),
+        }
+    }
+
+    #[cfg(test)]
+    async fn ready(&mut self) -> crate::Result<()> {
+        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+    }
+
+    /// Send data on data channel when it is ready.
+    #[cfg(test)]
+    #[allow(unused)]
+    pub(crate) async fn send_data(&mut self, chunk: Bytes) -> crate::Result<()> {
+        self.ready().await?;
+        self.data_tx
+            .try_send(Ok(chunk))
+            .map_err(|_| crate::Error::new_closed())
+    }
+
+    /// Send trailers on trailers channel.
+    #[allow(unused)]
+    pub(crate) async fn send_trailers(&mut self, trailers: HeaderMap) -> crate::Result<()> {
+        let tx = match self.trailers_tx.take() {
+            Some(tx) => tx,
+            None => return Err(crate::Error::new_closed()),
+        };
+        tx.send(trailers).map_err(|_| crate::Error::new_closed())
+    }
+
+    /// Try to send data on this channel.
+    ///
+    /// # Errors
+    ///
+    /// Returns `Err(Bytes)` if the channel could not (currently) accept
+    /// another `Bytes`.
+    ///
+    /// # Note
+    ///
+    /// This is mostly useful for when trying to send from some other thread
+    /// that doesn't have an async context. If in an async context, prefer
+    /// `send_data()` instead.
+    #[cfg(feature = "http1")]
+    pub(crate) fn try_send_data(&mut self, chunk: Bytes) -> Result<(), Bytes> {
+        self.data_tx
+            .try_send(Ok(chunk))
+            .map_err(|err| err.into_inner().expect("just sent Ok"))
+    }
+
+    #[cfg(feature = "http1")]
+    pub(crate) fn try_send_trailers(
+        &mut self,
+        trailers: HeaderMap,
+    ) -> Result<(), Option<HeaderMap>> {
+        let tx = match self.trailers_tx.take() {
+            Some(tx) => tx,
+            None => return Err(None),
+        };
+
+        tx.send(trailers).map_err(Some)
+    }
+
+    #[cfg(test)]
+    pub(crate) fn abort(mut self) {
+        self.send_error(crate::Error::new_body_write_aborted());
+    }
+
+    pub(crate) fn send_error(&mut self, err: crate::Error) {
+        let _ = self
+            .data_tx
+            // clone so the send works even if buffer is full
+            .clone()
+            .try_send(Err(err));
+    }
+}
+
+#[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
+impl fmt::Debug for Sender {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[derive(Debug)]
+        struct Open;
+        #[derive(Debug)]
+        struct Closed;
+
+        let mut builder = f.debug_tuple("Sender");
+        match self.want_rx.peek() {
+            watch::CLOSED => builder.field(&Closed),
+            _ => builder.field(&Open),
+        };
+
+        builder.finish()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::mem;
+    use std::task::Poll;
+
+    use super::{Body, DecodedLength, Incoming, Sender, SizeHint};
+    use http_body_util::BodyExt;
+
+    #[test]
+    fn test_size_of() {
+        // These are mostly to help catch *accidentally* increasing
+        // the size by too much.
+
+        let body_size = mem::size_of::<Incoming>();
+        let body_expected_size = mem::size_of::<u64>() * 5;
+        assert!(
+            body_size <= body_expected_size,
+            "Body size = {} <= {}",
+            body_size,
+            body_expected_size,
+        );
+
+        //assert_eq!(body_size, mem::size_of::<Option<Incoming>>(), "Option<Incoming>");
+
+        assert_eq!(
+            mem::size_of::<Sender>(),
+            mem::size_of::<usize>() * 5,
+            "Sender"
+        );
+
+        assert_eq!(
+            mem::size_of::<Sender>(),
+            mem::size_of::<Option<Sender>>(),
+            "Option<Sender>"
+        );
+    }
+
+    #[test]
+    fn size_hint() {
+        fn eq(body: Incoming, b: SizeHint, note: &str) {
+            let a = body.size_hint();
+            assert_eq!(a.lower(), b.lower(), "lower for {:?}", note);
+            assert_eq!(a.upper(), b.upper(), "upper for {:?}", note);
+        }
+
+        eq(Incoming::empty(), SizeHint::with_exact(0), "empty");
+
+        eq(Incoming::channel().1, SizeHint::new(), "channel");
+
+        eq(
+            Incoming::new_channel(DecodedLength::new(4), /*wanter =*/ false).1,
+            SizeHint::with_exact(4),
+            "channel with length",
+        );
+    }
+
+    #[cfg(not(miri))]
+    #[tokio::test]
+    async fn channel_abort() {
+        let (tx, mut rx) = Incoming::channel();
+
+        tx.abort();
+
+        let err = rx.frame().await.unwrap().unwrap_err();
+        assert!(err.is_body_write_aborted(), "{:?}", err);
+    }
+
+    #[cfg(all(not(miri), feature = "http1"))]
+    #[tokio::test]
+    async fn channel_abort_when_buffer_is_full() {
+        let (mut tx, mut rx) = Incoming::channel();
+
+        tx.try_send_data("chunk 1".into()).expect("send 1");
+        // buffer is full, but can still send abort
+        tx.abort();
+
+        let chunk1 = rx
+            .frame()
+            .await
+            .expect("item 1")
+            .expect("chunk 1")
+            .into_data()
+            .unwrap();
+        assert_eq!(chunk1, "chunk 1");
+
+        let err = rx.frame().await.unwrap().unwrap_err();
+        assert!(err.is_body_write_aborted(), "{:?}", err);
+    }
+
+    #[cfg(feature = "http1")]
+    #[test]
+    fn channel_buffers_one() {
+        let (mut tx, _rx) = Incoming::channel();
+
+        tx.try_send_data("chunk 1".into()).expect("send 1");
+
+        // buffer is now full
+        let chunk2 = tx.try_send_data("chunk 2".into()).expect_err("send 2");
+        assert_eq!(chunk2, "chunk 2");
+    }
+
+    #[cfg(not(miri))]
+    #[tokio::test]
+    async fn channel_empty() {
+        let (_, mut rx) = Incoming::channel();
+
+        assert!(rx.frame().await.is_none());
+    }
+
+    #[test]
+    fn channel_ready() {
+        let (mut tx, _rx) = Incoming::new_channel(DecodedLength::CHUNKED, /*wanter = */ false);
+
+        let mut tx_ready = tokio_test::task::spawn(tx.ready());
+
+        assert!(tx_ready.poll().is_ready(), "tx is ready immediately");
+    }
+
+    #[test]
+    fn channel_wanter() {
+        let (mut tx, mut rx) =
+            Incoming::new_channel(DecodedLength::CHUNKED, /*wanter = */ true);
+
+        let mut tx_ready = tokio_test::task::spawn(tx.ready());
+        let mut rx_data = tokio_test::task::spawn(rx.frame());
+
+        assert!(
+            tx_ready.poll().is_pending(),
+            "tx isn't ready before rx has been polled"
+        );
+
+        assert!(rx_data.poll().is_pending(), "poll rx.data");
+        assert!(tx_ready.is_woken(), "rx poll wakes tx");
+
+        assert!(
+            tx_ready.poll().is_ready(),
+            "tx is ready after rx has been polled"
+        );
+    }
+
+    #[test]
+    fn channel_notices_closure() {
+        let (mut tx, rx) = Incoming::new_channel(DecodedLength::CHUNKED, /*wanter = */ true);
+
+        let mut tx_ready = tokio_test::task::spawn(tx.ready());
+
+        assert!(
+            tx_ready.poll().is_pending(),
+            "tx isn't ready before rx has been polled"
+        );
+
+        drop(rx);
+        assert!(tx_ready.is_woken(), "dropping rx wakes tx");
+
+        match tx_ready.poll() {
+            Poll::Ready(Err(ref e)) if e.is_closed() => (),
+            unexpected => panic!("tx poll ready unexpected: {:?}", unexpected),
+        }
+    }
+}
diff --git a/vendor/hyper/src/body/length.rs b/vendor/hyper/src/body/length.rs
new file mode 100644
index 00000000..e5eab744
--- /dev/null
+++ b/vendor/hyper/src/body/length.rs
@@ -0,0 +1,129 @@
+use std::fmt;
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub(crate) struct DecodedLength(u64);
+
+#[cfg(any(feature = "http1", feature = "http2"))]
+impl From<Option<u64>> for DecodedLength {
+    fn from(len: Option<u64>) -> Self {
+        len.and_then(|len| {
+            // If the length is u64::MAX, oh well, just reported chunked.
+            Self::checked_new(len).ok()
+        })
+        .unwrap_or(DecodedLength::CHUNKED)
+    }
+}
+
+#[cfg(any(feature = "http1", feature = "http2", test))]
+const MAX_LEN: u64 = u64::MAX - 2;
+
+impl DecodedLength {
+    pub(crate) const CLOSE_DELIMITED: DecodedLength = DecodedLength(u64::MAX);
+    pub(crate) const CHUNKED: DecodedLength = DecodedLength(u64::MAX - 1);
+    pub(crate) const ZERO: DecodedLength = DecodedLength(0);
+
+    #[cfg(test)]
+    pub(crate) fn new(len: u64) -> Self {
+        debug_assert!(len <= MAX_LEN);
+        DecodedLength(len)
+    }
+
+    /// Takes the length as a content-length without other checks.
+    ///
+    /// Should only be called if previously confirmed this isn't
+    /// CLOSE_DELIMITED or CHUNKED.
+    #[inline]
+    #[cfg(all(any(feature = "client", feature = "server"), feature = "http1"))]
+    pub(crate) fn danger_len(self) -> u64 {
+        debug_assert!(self.0 < Self::CHUNKED.0);
+        self.0
+    }
+
+    /// Converts to an Option<u64> representing a Known or Unknown length.
+    #[cfg(all(
+        any(feature = "http1", feature = "http2"),
+        any(feature = "client", feature = "server")
+    ))]
+    pub(crate) fn into_opt(self) -> Option<u64> {
+        match self {
+            DecodedLength::CHUNKED | DecodedLength::CLOSE_DELIMITED => None,
+            DecodedLength(known) => Some(known),
+        }
+    }
+
+    /// Checks the `u64` is within the maximum allowed for content-length.
+    #[cfg(any(feature = "http1", feature = "http2"))]
+    pub(crate) fn checked_new(len: u64) -> Result<Self, crate::error::Parse> {
+        if len <= MAX_LEN {
+            Ok(DecodedLength(len))
+        } else {
+            warn!("content-length bigger than maximum: {} > {}", len, MAX_LEN);
+            Err(crate::error::Parse::TooLarge)
+        }
+    }
+
+    #[cfg(all(
+        any(feature = "http1", feature = "http2"),
+        any(feature = "client", feature = "server")
+    ))]
+    pub(crate) fn sub_if(&mut self, amt: u64) {
+        match *self {
+            DecodedLength::CHUNKED | DecodedLength::CLOSE_DELIMITED => (),
+            DecodedLength(ref mut known) => {
+                *known -= amt;
+            }
+        }
+    }
+
+    /// Returns whether this represents an exact length.
+    ///
+    /// This includes 0, which of course is an exact known length.
+    ///
+    /// It would return false if "chunked" or otherwise size-unknown.
+    #[cfg(all(any(feature = "client", feature = "server"), feature = "http2"))]
+    pub(crate) fn is_exact(&self) -> bool {
+        self.0 <= MAX_LEN
+    }
+}
+
+impl fmt::Debug for DecodedLength {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            DecodedLength::CLOSE_DELIMITED => f.write_str("CLOSE_DELIMITED"),
+            DecodedLength::CHUNKED => f.write_str("CHUNKED"),
+            DecodedLength(n) => f.debug_tuple("DecodedLength").field(&n).finish(),
+        }
+    }
+}
+
+impl fmt::Display for DecodedLength {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            DecodedLength::CLOSE_DELIMITED => f.write_str("close-delimited"),
+            DecodedLength::CHUNKED => f.write_str("chunked encoding"),
+            DecodedLength::ZERO => f.write_str("empty"),
+            DecodedLength(n) => write!(f, "content-length ({} bytes)", n),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn sub_if_known() {
+        let mut len = DecodedLength::new(30);
+        len.sub_if(20);
+
+        assert_eq!(len.0, 10);
+    }
+
+    #[test]
+    fn sub_if_chunked() {
+        let mut len = DecodedLength::CHUNKED;
+        len.sub_if(20);
+
+        assert_eq!(len, DecodedLength::CHUNKED);
+    }
+}
diff --git a/vendor/hyper/src/body/mod.rs b/vendor/hyper/src/body/mod.rs
new file mode 100644
index 00000000..7b71d98b
--- /dev/null
+++ b/vendor/hyper/src/body/mod.rs
@@ -0,0 +1,50 @@
+//! Streaming bodies for Requests and Responses
+//!
+//! For both [Clients](crate::client) and [Servers](crate::server), requests and
+//! responses use streaming bodies, instead of complete buffering. This
+//! allows applications to not use memory they don't need, and allows exerting
+//! back-pressure on connections by only reading when asked.
+//!
+//! There are two pieces to this in hyper:
+//!
+//! - **The [`Body`] trait** describes all possible bodies.
+//!   hyper allows any body type that implements `Body`, allowing
+//!   applications to have fine-grained control over their streaming.
+//! - **The [`Incoming`] concrete type**, which is an implementation
+//!   of `Body`, and returned by hyper as a "receive stream" (so, for server
+//!   requests and client responses).
+//!
+//! There are additional implementations available in [`http-body-util`][],
+//! such as a `Full` or `Empty` body.
+//!
+//! [`http-body-util`]: https://docs.rs/http-body-util
+
+pub use bytes::{Buf, Bytes};
+pub use http_body::Body;
+pub use http_body::Frame;
+pub use http_body::SizeHint;
+
+pub use self::incoming::Incoming;
+
+#[cfg(all(any(feature = "client", feature = "server"), feature = "http1"))]
+pub(crate) use self::incoming::Sender;
+#[cfg(all(
+    any(feature = "http1", feature = "http2"),
+    any(feature = "client", feature = "server")
+))]
+pub(crate) use self::length::DecodedLength;
+
+mod incoming;
+#[cfg(all(
+    any(feature = "http1", feature = "http2"),
+    any(feature = "client", feature = "server")
+))]
+mod length;
+
+fn _assert_send_sync() {
+    fn _assert_send<T: Send>() {}
+    fn _assert_sync<T: Sync>() {}
+
+    _assert_send::<Incoming>();
+    _assert_sync::<Incoming>();
+}