Initial oss-fuzz integration. (#529)

Signed-off-by: davkor <david@adalogics.com>

src/fuzz_bridge.rs

@@ -0,0 +1,28 @@
+#[cfg(fuzzing)]
+pub mod fuzz_logic {
+    use crate::hpack;
+    use bytes::{BufMut, BytesMut};
+    use http::header::HeaderName;
+    use std::io::Cursor;
+
+    pub fn fuzz_hpack(data_: &[u8]) {
+        let mut decoder_ = hpack::Decoder::new(0);
+        let mut buf = BytesMut::new();
+        buf.extend(data_);
+        let _dec_res = decoder_.decode(&mut Cursor::new(&mut buf), |_h| {});
+
+        if let Ok(s) = std::str::from_utf8(data_) {
+            if let Ok(h) = http::Method::from_bytes(s.as_bytes()) {
+                let m_ = hpack::Header::Method(h);
+                let mut encoder = hpack::Encoder::new(0, 0);
+                let _res = encode(&mut encoder, vec![m_]);
+            }
+        }
+    }
+
+    fn encode(e: &mut hpack::Encoder, hdrs: Vec<hpack::Header<Option<HeaderName>>>) -> BytesMut {
+        let mut dst = BytesMut::with_capacity(1024);
+        e.encode(None, &mut hdrs.into_iter(), &mut (&mut dst).limit(1024));
+        dst
+    }
+}

src/lib.rs

@@ -117,6 +117,10 @@ pub mod client;
 pub mod server;
 mod share;
 
+#[cfg(fuzzing)]
+#[cfg_attr(feature = "unstable", allow(missing_docs))]
+pub mod fuzz_bridge;
+
 pub use crate::error::{Error, Reason};
 pub use crate::share::{FlowControl, Ping, PingPong, Pong, RecvStream, SendStream, StreamId};