1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/rust/h2/src/frame/head.rs b/third_party/rust/h2/src/frame/head.rs
new file mode 100644
index 0000000000..38be2f6973
--- /dev/null
+++ b/third_party/rust/h2/src/frame/head.rs
@@ -0,0 +1,94 @@
+use super::StreamId;
+
+use bytes::BufMut;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub struct Head {
+    kind: Kind,
+    flag: u8,
+    stream_id: StreamId,
+}
+
+#[repr(u8)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum Kind {
+    Data = 0,
+    Headers = 1,
+    Priority = 2,
+    Reset = 3,
+    Settings = 4,
+    PushPromise = 5,
+    Ping = 6,
+    GoAway = 7,
+    WindowUpdate = 8,
+    Continuation = 9,
+    Unknown,
+}
+
+// ===== impl Head =====
+
+impl Head {
+    pub fn new(kind: Kind, flag: u8, stream_id: StreamId) -> Head {
+        Head {
+            kind,
+            flag,
+            stream_id,
+        }
+    }
+
+    /// Parse an HTTP/2 frame header
+    pub fn parse(header: &[u8]) -> Head {
+        let (stream_id, _) = StreamId::parse(&header[5..]);
+
+        Head {
+            kind: Kind::new(header[3]),
+            flag: header[4],
+            stream_id,
+        }
+    }
+
+    pub fn stream_id(&self) -> StreamId {
+        self.stream_id
+    }
+
+    pub fn kind(&self) -> Kind {
+        self.kind
+    }
+
+    pub fn flag(&self) -> u8 {
+        self.flag
+    }
+
+    pub fn encode_len(&self) -> usize {
+        super::HEADER_LEN
+    }
+
+    pub fn encode<T: BufMut>(&self, payload_len: usize, dst: &mut T) {
+        debug_assert!(self.encode_len() <= dst.remaining_mut());
+
+        dst.put_uint(payload_len as u64, 3);
+        dst.put_u8(self.kind as u8);
+        dst.put_u8(self.flag);
+        dst.put_u32(self.stream_id.into());
+    }
+}
+
+// ===== impl Kind =====
+
+impl Kind {
+    pub fn new(byte: u8) -> Kind {
+        match byte {
+            0 => Kind::Data,
+            1 => Kind::Headers,
+            2 => Kind::Priority,
+            3 => Kind::Reset,
+            4 => Kind::Settings,
+            5 => Kind::PushPromise,
+            6 => Kind::Ping,
+            7 => Kind::GoAway,
+            8 => Kind::WindowUpdate,
+            9 => Kind::Continuation,
+            _ => Kind::Unknown,
+        }
+    }
+}