1 files changed, 432 insertions, 0 deletions
diff --git a/vendor/futures/tests/io_buf_reader.rs b/vendor/futures/tests/io_buf_reader.rs
new file mode 100644
index 000000000..717297cce
--- /dev/null
+++ b/vendor/futures/tests/io_buf_reader.rs
@@ -0,0 +1,432 @@
+use futures::executor::block_on;
+use futures::future::{Future, FutureExt};
+use futures::io::{
+    AllowStdIo, AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt,
+    BufReader, SeekFrom,
+};
+use futures::pin_mut;
+use futures::task::{Context, Poll};
+use futures_test::task::noop_context;
+use pin_project::pin_project;
+use std::cmp;
+use std::io;
+use std::pin::Pin;
+
+// helper for maybe_pending_* tests
+fn run<F: Future + Unpin>(mut f: F) -> F::Output {
+    let mut cx = noop_context();
+    loop {
+        if let Poll::Ready(x) = f.poll_unpin(&mut cx) {
+            return x;
+        }
+    }
+}
+
+// https://github.com/rust-lang/futures-rs/pull/2489#discussion_r697865719
+#[pin_project(!Unpin)]
+struct Cursor<T> {
+    #[pin]
+    inner: futures::io::Cursor<T>,
+}
+
+impl<T> Cursor<T> {
+    fn new(inner: T) -> Self {
+        Self { inner: futures::io::Cursor::new(inner) }
+    }
+}
+
+impl AsyncRead for Cursor<&[u8]> {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<usize>> {
+        self.project().inner.poll_read(cx, buf)
+    }
+}
+
+impl AsyncBufRead for Cursor<&[u8]> {
+    fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
+        self.project().inner.poll_fill_buf(cx)
+    }
+
+    fn consume(self: Pin<&mut Self>, amt: usize) {
+        self.project().inner.consume(amt)
+    }
+}
+
+impl AsyncSeek for Cursor<&[u8]> {
+    fn poll_seek(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        pos: SeekFrom,
+    ) -> Poll<io::Result<u64>> {
+        self.project().inner.poll_seek(cx, pos)
+    }
+}
+
+struct MaybePending<'a> {
+    inner: &'a [u8],
+    ready_read: bool,
+    ready_fill_buf: bool,
+}
+
+impl<'a> MaybePending<'a> {
+    fn new(inner: &'a [u8]) -> Self {
+        Self { inner, ready_read: false, ready_fill_buf: false }
+    }
+}
+
+impl AsyncRead for MaybePending<'_> {
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<usize>> {
+        if self.ready_read {
+            self.ready_read = false;
+            Pin::new(&mut self.inner).poll_read(cx, buf)
+        } else {
+            self.ready_read = true;
+            Poll::Pending
+        }
+    }
+}
+
+impl AsyncBufRead for MaybePending<'_> {
+    fn poll_fill_buf(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
+        if self.ready_fill_buf {
+            self.ready_fill_buf = false;
+            if self.inner.is_empty() {
+                return Poll::Ready(Ok(&[]));
+            }
+            let len = cmp::min(2, self.inner.len());
+            Poll::Ready(Ok(&self.inner[0..len]))
+        } else {
+            self.ready_fill_buf = true;
+            Poll::Pending
+        }
+    }
+
+    fn consume(mut self: Pin<&mut Self>, amt: usize) {
+        self.inner = &self.inner[amt..];
+    }
+}
+
+#[test]
+fn test_buffered_reader() {
+    block_on(async {
+        let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+        let mut reader = BufReader::with_capacity(2, inner);
+
+        let mut buf = [0, 0, 0];
+        let nread = reader.read(&mut buf).await.unwrap();
+        assert_eq!(nread, 3);
+        assert_eq!(buf, [5, 6, 7]);
+        assert_eq!(reader.buffer(), []);
+
+        let mut buf = [0, 0];
+        let nread = reader.read(&mut buf).await.unwrap();
+        assert_eq!(nread, 2);
+        assert_eq!(buf, [0, 1]);
+        assert_eq!(reader.buffer(), []);
+
+        let mut buf = [0];
+        let nread = reader.read(&mut buf).await.unwrap();
+        assert_eq!(nread, 1);
+        assert_eq!(buf, [2]);
+        assert_eq!(reader.buffer(), [3]);
+
+        let mut buf = [0, 0, 0];
+        let nread = reader.read(&mut buf).await.unwrap();
+        assert_eq!(nread, 1);
+        assert_eq!(buf, [3, 0, 0]);
+        assert_eq!(reader.buffer(), []);
+
+        let nread = reader.read(&mut buf).await.unwrap();
+        assert_eq!(nread, 1);
+        assert_eq!(buf, [4, 0, 0]);
+        assert_eq!(reader.buffer(), []);
+
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 0);
+    });
+}
+
+#[test]
+fn test_buffered_reader_seek() {
+    block_on(async {
+        let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+        let reader = BufReader::with_capacity(2, Cursor::new(inner));
+        pin_mut!(reader);
+
+        assert_eq!(reader.seek(SeekFrom::Start(3)).await.unwrap(), 3);
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1][..]);
+        assert!(reader.seek(SeekFrom::Current(i64::MIN)).await.is_err());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1][..]);
+        assert_eq!(reader.seek(SeekFrom::Current(1)).await.unwrap(), 4);
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[1, 2][..]);
+        reader.as_mut().consume(1);
+        assert_eq!(reader.seek(SeekFrom::Current(-2)).await.unwrap(), 3);
+    });
+}
+
+#[test]
+fn test_buffered_reader_seek_relative() {
+    block_on(async {
+        let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+        let reader = BufReader::with_capacity(2, Cursor::new(inner));
+        pin_mut!(reader);
+
+        assert!(reader.as_mut().seek_relative(3).await.is_ok());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1][..]);
+        assert!(reader.as_mut().seek_relative(0).await.is_ok());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1][..]);
+        assert!(reader.as_mut().seek_relative(1).await.is_ok());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[1][..]);
+        assert!(reader.as_mut().seek_relative(-1).await.is_ok());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1][..]);
+        assert!(reader.as_mut().seek_relative(2).await.is_ok());
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[2, 3][..]);
+    });
+}
+
+#[test]
+fn test_buffered_reader_invalidated_after_read() {
+    block_on(async {
+        let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+        let reader = BufReader::with_capacity(3, Cursor::new(inner));
+        pin_mut!(reader);
+
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[5, 6, 7][..]);
+        reader.as_mut().consume(3);
+
+        let mut buffer = [0, 0, 0, 0, 0];
+        assert_eq!(reader.read(&mut buffer).await.unwrap(), 5);
+        assert_eq!(buffer, [0, 1, 2, 3, 4]);
+
+        assert!(reader.as_mut().seek_relative(-2).await.is_ok());
+        let mut buffer = [0, 0];
+        assert_eq!(reader.read(&mut buffer).await.unwrap(), 2);
+        assert_eq!(buffer, [3, 4]);
+    });
+}
+
+#[test]
+fn test_buffered_reader_invalidated_after_seek() {
+    block_on(async {
+        let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+        let reader = BufReader::with_capacity(3, Cursor::new(inner));
+        pin_mut!(reader);
+
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[5, 6, 7][..]);
+        reader.as_mut().consume(3);
+
+        assert!(reader.seek(SeekFrom::Current(5)).await.is_ok());
+
+        assert!(reader.as_mut().seek_relative(-2).await.is_ok());
+        let mut buffer = [0, 0];
+        assert_eq!(reader.read(&mut buffer).await.unwrap(), 2);
+        assert_eq!(buffer, [3, 4]);
+    });
+}
+
+#[test]
+fn test_buffered_reader_seek_underflow() {
+    // gimmick reader that yields its position modulo 256 for each byte
+    struct PositionReader {
+        pos: u64,
+    }
+    impl io::Read for PositionReader {
+        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+            let len = buf.len();
+            for x in buf {
+                *x = self.pos as u8;
+                self.pos = self.pos.wrapping_add(1);
+            }
+            Ok(len)
+        }
+    }
+    impl io::Seek for PositionReader {
+        fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
+            match pos {
+                SeekFrom::Start(n) => {
+                    self.pos = n;
+                }
+                SeekFrom::Current(n) => {
+                    self.pos = self.pos.wrapping_add(n as u64);
+                }
+                SeekFrom::End(n) => {
+                    self.pos = u64::MAX.wrapping_add(n as u64);
+                }
+            }
+            Ok(self.pos)
+        }
+    }
+
+    block_on(async {
+        let reader = BufReader::with_capacity(5, AllowStdIo::new(PositionReader { pos: 0 }));
+        pin_mut!(reader);
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap(), &[0, 1, 2, 3, 4][..]);
+        assert_eq!(reader.seek(SeekFrom::End(-5)).await.unwrap(), u64::MAX - 5);
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap().len(), 5);
+        // the following seek will require two underlying seeks
+        let expected = 9_223_372_036_854_775_802;
+        assert_eq!(reader.seek(SeekFrom::Current(i64::MIN)).await.unwrap(), expected);
+        assert_eq!(reader.as_mut().fill_buf().await.unwrap().len(), 5);
+        // seeking to 0 should empty the buffer.
+        assert_eq!(reader.seek(SeekFrom::Current(0)).await.unwrap(), expected);
+        assert_eq!(reader.get_ref().get_ref().pos, expected);
+    });
+}
+
+#[test]
+fn test_short_reads() {
+    /// A dummy reader intended at testing short-reads propagation.
+    struct ShortReader {
+        lengths: Vec<usize>,
+    }
+
+    impl io::Read for ShortReader {
+        fn read(&mut self, _: &mut [u8]) -> io::Result<usize> {
+            if self.lengths.is_empty() {
+                Ok(0)
+            } else {
+                Ok(self.lengths.remove(0))
+            }
+        }
+    }
+
+    block_on(async {
+        let inner = ShortReader { lengths: vec![0, 1, 2, 0, 1, 0] };
+        let mut reader = BufReader::new(AllowStdIo::new(inner));
+        let mut buf = [0, 0];
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 0);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 1);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 2);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 0);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 1);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 0);
+        assert_eq!(reader.read(&mut buf).await.unwrap(), 0);
+    });
+}
+
+#[test]
+fn maybe_pending() {
+    let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+    let mut reader = BufReader::with_capacity(2, MaybePending::new(inner));
+
+    let mut buf = [0, 0, 0];
+    let nread = run(reader.read(&mut buf));
+    assert_eq!(nread.unwrap(), 3);
+    assert_eq!(buf, [5, 6, 7]);
+    assert_eq!(reader.buffer(), []);
+
+    let mut buf = [0, 0];
+    let nread = run(reader.read(&mut buf));
+    assert_eq!(nread.unwrap(), 2);
+    assert_eq!(buf, [0, 1]);
+    assert_eq!(reader.buffer(), []);
+
+    let mut buf = [0];
+    let nread = run(reader.read(&mut buf));
+    assert_eq!(nread.unwrap(), 1);
+    assert_eq!(buf, [2]);
+    assert_eq!(reader.buffer(), [3]);
+
+    let mut buf = [0, 0, 0];
+    let nread = run(reader.read(&mut buf));
+    assert_eq!(nread.unwrap(), 1);
+    assert_eq!(buf, [3, 0, 0]);
+    assert_eq!(reader.buffer(), []);
+
+    let nread = run(reader.read(&mut buf));
+    assert_eq!(nread.unwrap(), 1);
+    assert_eq!(buf, [4, 0, 0]);
+    assert_eq!(reader.buffer(), []);
+
+    assert_eq!(run(reader.read(&mut buf)).unwrap(), 0);
+}
+
+#[test]
+fn maybe_pending_buf_read() {
+    let inner = MaybePending::new(&[0, 1, 2, 3, 1, 0]);
+    let mut reader = BufReader::with_capacity(2, inner);
+    let mut v = Vec::new();
+    run(reader.read_until(3, &mut v)).unwrap();
+    assert_eq!(v, [0, 1, 2, 3]);
+    v.clear();
+    run(reader.read_until(1, &mut v)).unwrap();
+    assert_eq!(v, [1]);
+    v.clear();
+    run(reader.read_until(8, &mut v)).unwrap();
+    assert_eq!(v, [0]);
+    v.clear();
+    run(reader.read_until(9, &mut v)).unwrap();
+    assert_eq!(v, []);
+}
+
+// https://github.com/rust-lang/futures-rs/pull/1573#discussion_r281162309
+#[test]
+fn maybe_pending_seek() {
+    #[pin_project]
+    struct MaybePendingSeek<'a> {
+        #[pin]
+        inner: Cursor<&'a [u8]>,
+        ready: bool,
+    }
+
+    impl<'a> MaybePendingSeek<'a> {
+        fn new(inner: &'a [u8]) -> Self {
+            Self { inner: Cursor::new(inner), ready: true }
+        }
+    }
+
+    impl AsyncRead for MaybePendingSeek<'_> {
+        fn poll_read(
+            self: Pin<&mut Self>,
+            cx: &mut Context<'_>,
+            buf: &mut [u8],
+        ) -> Poll<io::Result<usize>> {
+            self.project().inner.poll_read(cx, buf)
+        }
+    }
+
+    impl AsyncBufRead for MaybePendingSeek<'_> {
+        fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
+            self.project().inner.poll_fill_buf(cx)
+        }
+
+        fn consume(self: Pin<&mut Self>, amt: usize) {
+            self.project().inner.consume(amt)
+        }
+    }
+
+    impl AsyncSeek for MaybePendingSeek<'_> {
+        fn poll_seek(
+            mut self: Pin<&mut Self>,
+            cx: &mut Context<'_>,
+            pos: SeekFrom,
+        ) -> Poll<io::Result<u64>> {
+            if self.ready {
+                *self.as_mut().project().ready = false;
+                self.project().inner.poll_seek(cx, pos)
+            } else {
+                *self.project().ready = true;
+                Poll::Pending
+            }
+        }
+    }
+
+    let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
+    let reader = BufReader::with_capacity(2, MaybePendingSeek::new(inner));
+    pin_mut!(reader);
+
+    assert_eq!(run(reader.seek(SeekFrom::Current(3))).ok(), Some(3));
+    assert_eq!(run(reader.as_mut().fill_buf()).ok(), Some(&[0, 1][..]));
+    assert_eq!(run(reader.seek(SeekFrom::Current(i64::MIN))).ok(), None);
+    assert_eq!(run(reader.as_mut().fill_buf()).ok(), Some(&[0, 1][..]));
+    assert_eq!(run(reader.seek(SeekFrom::Current(1))).ok(), Some(4));
+    assert_eq!(run(reader.as_mut().fill_buf()).ok(), Some(&[1, 2][..]));
+    Pin::new(&mut reader).consume(1);
+    assert_eq!(run(reader.seek(SeekFrom::Current(-2))).ok(), Some(3));
+}