1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/rust/neqo-http3/src/control_stream_remote.rs b/third_party/rust/neqo-http3/src/control_stream_remote.rs
new file mode 100644
index 0000000000..69ca4712c2
--- /dev/null
+++ b/third_party/rust/neqo-http3/src/control_stream_remote.rs
@@ -0,0 +1,68 @@
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::hframe::{HFrame, HFrameReader};
+use crate::{Error, Res};
+use neqo_common::{qdebug, qinfo};
+use neqo_transport::Connection;
+
+/// The remote control stream is responsible only for reading frames. The frames are handled by `Http3Connection`.
+#[derive(Debug)]
+pub(crate) struct ControlStreamRemote {
+    stream_id: Option<u64>,
+    frame_reader: HFrameReader,
+    fin: bool,
+}
+
+impl ::std::fmt::Display for ControlStreamRemote {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        write!(f, "Http3 remote control stream {:?}", self.stream_id)
+    }
+}
+
+impl ControlStreamRemote {
+    pub fn new() -> Self {
+        Self {
+            stream_id: None,
+            frame_reader: HFrameReader::new(),
+            fin: false,
+        }
+    }
+
+    /// A remote control stream has been received. Inform `ControlStreamRemote`.
+    pub fn add_remote_stream(&mut self, stream_id: u64) -> Res<()> {
+        qinfo!([self], "A new control stream {}.", stream_id);
+        if self.stream_id.is_some() {
+            qdebug!([self], "A control stream already exists");
+            return Err(Error::HttpStreamCreation);
+        }
+        self.stream_id = Some(stream_id);
+        Ok(())
+    }
+
+    /// Check if `stream_id` is the remote control stream.
+    pub fn is_recv_stream(&self, stream_id: u64) -> bool {
+        matches!(self.stream_id, Some(id) if id == stream_id)
+    }
+
+    /// Check if a stream is the control stream and read received data.
+    pub fn receive(&mut self, conn: &mut Connection) -> Res<Option<HFrame>> {
+        assert!(self.stream_id.is_some());
+        qdebug!([self], "Receiving data.");
+        match self.frame_reader.receive(conn, self.stream_id.unwrap())? {
+            (_, true) => {
+                self.fin = true;
+                Err(Error::HttpClosedCriticalStream)
+            }
+            (s, false) => Ok(s),
+        }
+    }
+
+    #[must_use]
+    pub fn stream_id(&self) -> Option<u64> {
+        self.stream_id
+    }
+}