src/quiche/h3/stream.rs.html - third_party/rust-mirrors/quiche - Git at Google

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 </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2019, Cloudflare, Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright notice,
 //       this list of conditions and the following disclaimer.
 //
 //     * Redistributions in binary form must reproduce the above copyright
 //       notice, this list of conditions and the following disclaimer in the
 //       documentation and/or other materials provided with the distribution.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 </span><span class="kw">use </span><span class="kw">super</span>::Error;
 <span class="kw">use </span><span class="kw">super</span>::Result;

 <span class="kw">use </span><span class="kw">super</span>::frame;

 <span class="kw">pub const </span>HTTP3_CONTROL_STREAM_TYPE_ID: u64 = <span class="number">0x0</span>;
 <span class="kw">pub const </span>HTTP3_PUSH_STREAM_TYPE_ID: u64 = <span class="number">0x1</span>;
 <span class="kw">pub const </span>QPACK_ENCODER_STREAM_TYPE_ID: u64 = <span class="number">0x2</span>;
 <span class="kw">pub const </span>QPACK_DECODER_STREAM_TYPE_ID: u64 = <span class="number">0x3</span>;

 <span class="kw">const </span>MAX_STATE_BUF_SIZE: usize = (<span class="number">1 </span>&lt;&lt; <span class="number">24</span>) - <span class="number">1</span>;

 <span class="attr">#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 </span><span class="kw">pub enum </span>Type {
     Control,
     Request,
     Push,
     QpackEncoder,
     QpackDecoder,
     Unknown,
 }

 <span class="kw">impl </span>Type {
     <span class="attr">#[cfg(feature = <span class="string">"qlog"</span>)]
     </span><span class="kw">pub fn </span>to_qlog(<span class="self">self</span>) -&gt; qlog::events::h3::H3StreamType {
         <span class="kw">match </span><span class="self">self </span>{
             Type::Control =&gt; qlog::events::h3::H3StreamType::Control,
             Type::Request =&gt; qlog::events::h3::H3StreamType::Request,
             Type::Push =&gt; qlog::events::h3::H3StreamType::Push,
             Type::QpackEncoder =&gt; qlog::events::h3::H3StreamType::QpackEncode,
             Type::QpackDecoder =&gt; qlog::events::h3::H3StreamType::QpackDecode,
             Type::Unknown =&gt; qlog::events::h3::H3StreamType::Unknown,
         }
     }
 }

 <span class="attr">#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 </span><span class="kw">pub enum </span>State {
     <span class="doccomment">/// Reading the stream's type.
     </span>StreamType,

     <span class="doccomment">/// Reading the stream's current frame's type.
     </span>FrameType,

     <span class="doccomment">/// Reading the stream's current frame's payload length.
     </span>FramePayloadLen,

     <span class="doccomment">/// Reading the stream's current frame's payload.
     </span>FramePayload,

     <span class="doccomment">/// Reading DATA payload.
     </span>Data,

     <span class="doccomment">/// Reading the push ID.
     </span>PushId,

     <span class="doccomment">/// Reading a QPACK instruction.
     </span>QpackInstruction,

     <span class="doccomment">/// Reading and discarding data.
     </span>Drain,

     <span class="doccomment">/// All data has been read.
     </span>Finished,
 }

 <span class="kw">impl </span>Type {
     <span class="kw">pub fn </span>deserialize(v: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Type&gt; {
         <span class="kw">match </span>v {
             HTTP3_CONTROL_STREAM_TYPE_ID =&gt; <span class="prelude-val">Ok</span>(Type::Control),
             HTTP3_PUSH_STREAM_TYPE_ID =&gt; <span class="prelude-val">Ok</span>(Type::Push),
             QPACK_ENCODER_STREAM_TYPE_ID =&gt; <span class="prelude-val">Ok</span>(Type::QpackEncoder),
             QPACK_DECODER_STREAM_TYPE_ID =&gt; <span class="prelude-val">Ok</span>(Type::QpackDecoder),

             <span class="kw">_ </span>=&gt; <span class="prelude-val">Ok</span>(Type::Unknown),
         }
     }
 }

 <span class="doccomment">/// An HTTP/3 stream.
 ///
 /// This maintains the HTTP/3 state for streams of any type (control, request,
 /// QPACK, ...).
 ///
 /// A number of bytes, depending on the current stream's state, is read from the
 /// transport stream into the HTTP/3 stream's "state buffer". This intermediate
 /// buffering is required due to the fact that data read from the transport
 /// might not be complete (e.g. a varint might be split across multiple QUIC
 /// packets).
 ///
 /// When enough data to complete the current state has been buffered, it is
 /// consumed from the state buffer and the stream is transitioned to the next
 /// state (see `State` for a list of possible states).
 </span><span class="attr">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Stream {
     <span class="doccomment">/// The corresponding transport stream's ID.
     </span>id: u64,

     <span class="doccomment">/// The stream's type (if known).
     </span>ty: <span class="prelude-ty">Option</span>&lt;Type&gt;,

     <span class="doccomment">/// The current stream state.
     </span>state: State,

     <span class="doccomment">/// The buffer holding partial data for the current state.
     </span>state_buf: Vec&lt;u8&gt;,

     <span class="doccomment">/// The expected amount of bytes required to complete the state.
     </span>state_len: usize,

     <span class="doccomment">/// The write offset in the state buffer, that is, how many bytes have
     /// already been read from the transport for the current state. When
     /// it reaches `stream_len` the state can be completed.
     </span>state_off: usize,

     <span class="doccomment">/// The type of the frame currently being parsed.
     </span>frame_type: <span class="prelude-ty">Option</span>&lt;u64&gt;,

     <span class="doccomment">/// Whether the stream was created locally, or by the peer.
     </span>is_local: bool,

     <span class="doccomment">/// Whether the stream has been remotely initialized.
     </span>remote_initialized: bool,

     <span class="doccomment">/// Whether the stream has been locally initialized.
     </span>local_initialized: bool,

     <span class="doccomment">/// Whether a `Data` event has been triggered for this stream.
     </span>data_event_triggered: bool,

     <span class="doccomment">/// The last `PRIORITY_UPDATE` frame encoded field value, if any.
     </span>last_priority_update: <span class="prelude-ty">Option</span>&lt;Vec&lt;u8&gt;&gt;,
 }

 <span class="kw">impl </span>Stream {
     <span class="doccomment">/// Creates a new HTTP/3 stream.
     ///
     /// The `is_local` parameter indicates whether the stream was created by the
     /// local endpoint, or by the peer.
     </span><span class="kw">pub fn </span>new(id: u64, is_local: bool) -&gt; Stream {
         <span class="kw">let </span>(ty, state) = <span class="kw">if </span><span class="kw">crate</span>::stream::is_bidi(id) {
             <span class="comment">// All bidirectional streams are "request" streams, so we don't
             // need to read the stream type.
             </span>(<span class="prelude-val">Some</span>(Type::Request), State::FrameType)
         } <span class="kw">else </span>{
             <span class="comment">// The stream's type is yet to be determined.
             </span>(<span class="prelude-val">None</span>, State::StreamType)
         };

         Stream {
             id,
             ty,

             state,

             <span class="comment">// Pre-allocate a buffer to avoid multiple tiny early allocations.
             </span>state_buf: <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">16</span>],

             <span class="comment">// Expect one byte for the initial state, to parse the initial
             // varint length.
             </span>state_len: <span class="number">1</span>,
             state_off: <span class="number">0</span>,

             frame_type: <span class="prelude-val">None</span>,

             is_local,
             remote_initialized: <span class="bool-val">false</span>,
             local_initialized: <span class="bool-val">false</span>,

             data_event_triggered: <span class="bool-val">false</span>,

             last_priority_update: <span class="prelude-val">None</span>,
         }
     }

     <span class="kw">pub fn </span>ty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Type&gt; {
         <span class="self">self</span>.ty
     }

     <span class="kw">pub fn </span>state(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; State {
         <span class="self">self</span>.state
     }

     <span class="doccomment">/// Sets the stream's type and transitions to the next state.
     </span><span class="kw">pub fn </span>set_ty(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ty: Type) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.state, State::StreamType);

         <span class="self">self</span>.ty = <span class="prelude-val">Some</span>(ty);

         <span class="kw">let </span>state = <span class="kw">match </span>ty {
             Type::Control | Type::Request =&gt; State::FrameType,

             Type::Push =&gt; State::PushId,

             Type::QpackEncoder | Type::QpackDecoder =&gt; {
                 <span class="self">self</span>.remote_initialized = <span class="bool-val">true</span>;

                 State::QpackInstruction
             },

             Type::Unknown =&gt; State::Drain,
         };

         <span class="self">self</span>.state_transition(state, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Sets the push ID and transitions to the next state.
     </span><span class="kw">pub fn </span>set_push_id(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _id: u64) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.state, State::PushId);

         <span class="comment">// TODO: implement push ID.

         </span><span class="self">self</span>.state_transition(State::FrameType, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Sets the frame type and transitions to the next state.
     </span><span class="kw">pub fn </span>set_frame_type(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ty: u64) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.state, State::FrameType);

         <span class="comment">// Only expect frames on Control, Request and Push streams.
         </span><span class="kw">match </span><span class="self">self</span>.ty {
             <span class="prelude-val">Some</span>(Type::Control) =&gt; {
                 <span class="comment">// Control stream starts uninitialized and only SETTINGS is
                 // accepted in that state. Other frames cause an error. Once
                 // initialized, no more SETTINGS are permitted.
                 </span><span class="kw">match </span>(ty, <span class="self">self</span>.remote_initialized) {
                     <span class="comment">// Initialize control stream.
                     </span>(frame::SETTINGS_FRAME_TYPE_ID, <span class="bool-val">false</span>) =&gt;
                         <span class="self">self</span>.remote_initialized = <span class="bool-val">true</span>,

                     <span class="comment">// Non-SETTINGS frames not allowed on control stream
                     // before initialization.
                     </span>(<span class="kw">_</span>, <span class="bool-val">false</span>) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::MissingSettings),

                     <span class="comment">// Additional SETTINGS frame.
                     </span>(frame::SETTINGS_FRAME_TYPE_ID, <span class="bool-val">true</span>) =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     <span class="comment">// Frames that can't be received on control stream
                     // after initialization.
                     </span>(frame::DATA_FRAME_TYPE_ID, <span class="bool-val">true</span>) =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     (frame::HEADERS_FRAME_TYPE_ID, <span class="bool-val">true</span>) =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     (frame::PUSH_PROMISE_FRAME_TYPE_ID, <span class="bool-val">true</span>) =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     <span class="comment">// All other frames are ignored after initialization.
                     </span>(<span class="kw">_</span>, <span class="bool-val">true</span>) =&gt; (),
                 }
             },

             <span class="prelude-val">Some</span>(Type::Request) =&gt; {
                 <span class="comment">// Request stream starts uninitialized and only HEADERS
                 // is accepted. Other frames cause an error.
                 </span><span class="kw">if </span>!<span class="self">self</span>.is_local {
                     <span class="kw">match </span>(ty, <span class="self">self</span>.remote_initialized) {
                         (frame::HEADERS_FRAME_TYPE_ID, <span class="bool-val">false</span>) =&gt;
                             <span class="self">self</span>.remote_initialized = <span class="bool-val">true</span>,

                         (frame::DATA_FRAME_TYPE_ID, <span class="bool-val">false</span>) =&gt;
                             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                         (frame::CANCEL_PUSH_FRAME_TYPE_ID, <span class="kw">_</span>) =&gt;
                             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                         (frame::SETTINGS_FRAME_TYPE_ID, <span class="kw">_</span>) =&gt;
                             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                         (frame::GOAWAY_FRAME_TYPE_ID, <span class="kw">_</span>) =&gt;
                             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                         (frame::MAX_PUSH_FRAME_TYPE_ID, <span class="kw">_</span>) =&gt;
                             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                         <span class="comment">// All other frames can be ignored regardless of stream
                         // state.
                         </span><span class="kw">_ </span>=&gt; (),
                     }
                 }
             },

             <span class="prelude-val">Some</span>(Type::Push) =&gt; {
                 <span class="kw">match </span>ty {
                     <span class="comment">// Frames that can never be received on request streams.
                     </span>frame::CANCEL_PUSH_FRAME_TYPE_ID =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     frame::SETTINGS_FRAME_TYPE_ID =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     frame::PUSH_PROMISE_FRAME_TYPE_ID =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     frame::GOAWAY_FRAME_TYPE_ID =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     frame::MAX_PUSH_FRAME_TYPE_ID =&gt;
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),

                     <span class="kw">_ </span>=&gt; (),
                 }
             },

             <span class="kw">_ </span>=&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameUnexpected),
         }

         <span class="self">self</span>.frame_type = <span class="prelude-val">Some</span>(ty);

         <span class="self">self</span>.state_transition(State::FramePayloadLen, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }

     <span class="comment">// Returns the stream's current frame type, if any
     </span><span class="kw">pub fn </span>frame_type(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u64&gt; {
         <span class="self">self</span>.frame_type
     }

     <span class="doccomment">/// Sets the frame's payload length and transitions to the next state.
     </span><span class="kw">pub fn </span>set_frame_payload_len(<span class="kw-2">&amp;mut </span><span class="self">self</span>, len: u64) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.state, State::FramePayloadLen);

         <span class="comment">// Only expect frames on Control, Request and Push streams.
         </span><span class="kw">if </span><span class="macro">matches!</span>(<span class="self">self</span>.ty, <span class="prelude-val">Some</span>(Type::Control | Type::Request | Type::Push)) {
             <span class="kw">let </span>(state, resize) = <span class="kw">match </span><span class="self">self</span>.frame_type {
                 <span class="prelude-val">Some</span>(frame::DATA_FRAME_TYPE_ID) =&gt; (State::Data, <span class="bool-val">false</span>),

                 <span class="comment">// These frame types can never have 0 payload length because
                 // they always have fields that must be populated.
                 </span><span class="prelude-val">Some</span>(
                     frame::GOAWAY_FRAME_TYPE_ID |
                     frame::PUSH_PROMISE_FRAME_TYPE_ID |
                     frame::CANCEL_PUSH_FRAME_TYPE_ID |
                     frame::MAX_PUSH_FRAME_TYPE_ID,
                 ) =&gt; {
                     <span class="kw">if </span>len == <span class="number">0 </span>{
                         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FrameError);
                     }

                     (State::FramePayload, <span class="bool-val">true</span>)
                 },

                 <span class="kw">_ </span>=&gt; (State::FramePayload, <span class="bool-val">true</span>),
             };

             <span class="self">self</span>.state_transition(state, len <span class="kw">as </span>usize, resize)<span class="question-mark">?</span>;

             <span class="kw">return </span><span class="prelude-val">Ok</span>(());
         }

         <span class="prelude-val">Err</span>(Error::InternalError)
     }

     <span class="doccomment">/// Tries to fill the state buffer by reading data from the corresponding
     /// transport stream.
     ///
     /// When not enough data can be read to complete the state, this returns
     /// `Error::Done`.
     </span><span class="kw">pub fn </span>try_fill_buffer(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>, conn: <span class="kw-2">&amp;mut </span><span class="kw">crate</span>::Connection,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="comment">// If no bytes are required to be read, return early.
         </span><span class="kw">if </span><span class="self">self</span>.state_buffer_complete() {
             <span class="kw">return </span><span class="prelude-val">Ok</span>(());
         }

         <span class="kw">let </span>buf = <span class="kw-2">&amp;mut </span><span class="self">self</span>.state_buf[<span class="self">self</span>.state_off..<span class="self">self</span>.state_len];

         <span class="kw">let </span>read = <span class="kw">match </span>conn.stream_recv(<span class="self">self</span>.id, buf) {
             <span class="prelude-val">Ok</span>((len, <span class="kw">_</span>)) =&gt; len,

             <span class="prelude-val">Err</span>(e) =&gt; {
                 <span class="comment">// The stream is not readable anymore, so re-arm the Data event.
                 </span><span class="kw">if </span>e == <span class="kw">crate</span>::Error::Done {
                     <span class="self">self</span>.reset_data_event();
                 }

                 <span class="kw">return </span><span class="prelude-val">Err</span>(e.into());
             },
         };

         <span class="macro">trace!</span>(
             <span class="string">"{} read {} bytes on stream {}"</span>,
             conn.trace_id(),
             read,
             <span class="self">self</span>.id,
         );

         <span class="self">self</span>.state_off += read;

         <span class="kw">if </span>!<span class="self">self</span>.state_buffer_complete() {
             <span class="self">self</span>.reset_data_event();

             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done);
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Initialize the local part of the stream.
     </span><span class="kw">pub fn </span>initialize_local(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.local_initialized = <span class="bool-val">true
     </span>}

     <span class="doccomment">/// Whether the stream has been locally initialized.
     </span><span class="kw">pub fn </span>local_initialized(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.local_initialized
     }

     <span class="doccomment">/// Tries to fill the state buffer by reading data from the given cursor.
     ///
     /// This is intended to replace `try_fill_buffer()` in tests, in order to
     /// avoid having to setup a transport connection.
     </span><span class="attr">#[cfg(test)]
     </span><span class="kw">fn </span>try_fill_buffer_for_tests(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>std::io::Cursor&lt;Vec&lt;u8&gt;&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="comment">// If no bytes are required to be read, return early
         </span><span class="kw">if </span><span class="self">self</span>.state_buffer_complete() {
             <span class="kw">return </span><span class="prelude-val">Ok</span>(());
         }

         <span class="kw">let </span>buf = <span class="kw-2">&amp;mut </span><span class="self">self</span>.state_buf[<span class="self">self</span>.state_off..<span class="self">self</span>.state_len];

         <span class="kw">let </span>read = std::io::Read::read(stream, buf).unwrap();

         <span class="self">self</span>.state_off += read;

         <span class="kw">if </span>!<span class="self">self</span>.state_buffer_complete() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done);
         }

         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Tries to parse a varint (including length) from the state buffer.
     </span><span class="kw">pub fn </span>try_consume_varint(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;u64&gt; {
         <span class="kw">if </span><span class="self">self</span>.state_off == <span class="number">1 </span>{
             <span class="self">self</span>.state_len = octets::varint_parse_len(<span class="self">self</span>.state_buf[<span class="number">0</span>]);
             <span class="self">self</span>.state_buf.resize(<span class="self">self</span>.state_len, <span class="number">0</span>);
         }

         <span class="comment">// Return early if we don't have enough data in the state buffer to
         // parse the whole varint.
         </span><span class="kw">if </span>!<span class="self">self</span>.state_buffer_complete() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done);
         }

         <span class="kw">let </span>varint = octets::Octets::with_slice(<span class="kw-2">&amp;</span><span class="self">self</span>.state_buf).get_varint()<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(varint)
     }

     <span class="doccomment">/// Tries to parse a frame from the state buffer.
     ///
     /// If successful, returns the `frame::Frame` and the payload length.
     </span><span class="kw">pub fn </span>try_consume_frame(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(frame::Frame, u64)&gt; {
         <span class="comment">// Processing a frame other than DATA, so re-arm the Data event.
         </span><span class="self">self</span>.reset_data_event();

         <span class="kw">let </span>payload_len = <span class="self">self</span>.state_len <span class="kw">as </span>u64;

         <span class="comment">// TODO: properly propagate frame parsing errors.
         </span><span class="kw">let </span>frame = frame::Frame::from_bytes(
             <span class="self">self</span>.frame_type.unwrap(),
             payload_len,
             <span class="kw-2">&amp;</span><span class="self">self</span>.state_buf,
         )<span class="question-mark">?</span>;

         <span class="self">self</span>.state_transition(State::FrameType, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>((frame, payload_len))
     }

     <span class="doccomment">/// Tries to read DATA payload from the transport stream.
     </span><span class="kw">pub fn </span>try_consume_data(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>, conn: <span class="kw-2">&amp;mut </span><span class="kw">crate</span>::Connection, out: <span class="kw-2">&amp;mut </span>[u8],
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(usize, bool)&gt; {
         <span class="kw">let </span>left = std::cmp::min(out.len(), <span class="self">self</span>.state_len - <span class="self">self</span>.state_off);

         <span class="kw">let </span>(len, fin) = <span class="kw">match </span>conn.stream_recv(<span class="self">self</span>.id, <span class="kw-2">&amp;mut </span>out[..left]) {
             <span class="prelude-val">Ok</span>(v) =&gt; v,

             <span class="prelude-val">Err</span>(e) =&gt; {
                 <span class="comment">// The stream is not readable anymore, so re-arm the Data event.
                 </span><span class="kw">if </span>e == <span class="kw">crate</span>::Error::Done {
                     <span class="self">self</span>.reset_data_event();
                 }

                 <span class="kw">return </span><span class="prelude-val">Err</span>(e.into());
             },
         };

         <span class="self">self</span>.state_off += len;

         <span class="comment">// The stream is not readable anymore, so re-arm the Data event.
         </span><span class="kw">if </span>!conn.stream_readable(<span class="self">self</span>.id) {
             <span class="self">self</span>.reset_data_event();
         }

         <span class="kw">if </span><span class="self">self</span>.state_buffer_complete() {
             <span class="self">self</span>.state_transition(State::FrameType, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>((len, fin))
     }

     <span class="doccomment">/// Marks the stream as finished.
     </span><span class="kw">pub fn </span>finished(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">let _ </span>= <span class="self">self</span>.state_transition(State::Finished, <span class="number">0</span>, <span class="bool-val">false</span>);
     }

     <span class="doccomment">/// Tries to read DATA payload from the given cursor.
     ///
     /// This is intended to replace `try_consume_data()` in tests, in order to
     /// avoid having to setup a transport connection.
     </span><span class="attr">#[cfg(test)]
     </span><span class="kw">fn </span>try_consume_data_for_tests(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>, stream: <span class="kw-2">&amp;mut </span>std::io::Cursor&lt;Vec&lt;u8&gt;&gt;, out: <span class="kw-2">&amp;mut </span>[u8],
     ) -&gt; <span class="prelude-ty">Result</span>&lt;usize&gt; {
         <span class="kw">let </span>left = std::cmp::min(out.len(), <span class="self">self</span>.state_len - <span class="self">self</span>.state_off);

         <span class="kw">let </span>len = std::io::Read::read(stream, <span class="kw-2">&amp;mut </span>out[..left]).unwrap();

         <span class="self">self</span>.state_off += len;

         <span class="kw">if </span><span class="self">self</span>.state_buffer_complete() {
             <span class="self">self</span>.state_transition(State::FrameType, <span class="number">1</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</span>(len)
     }

     <span class="doccomment">/// Tries to update the data triggered state for the stream.
     ///
     /// This returns `true` if a Data event was not already triggered before
     /// the last reset, and updates the state. Returns `false` otherwise.
     </span><span class="kw">pub fn </span>try_trigger_data_event(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; bool {
         <span class="kw">if </span><span class="self">self</span>.data_event_triggered {
             <span class="kw">return </span><span class="bool-val">false</span>;
         }

         <span class="self">self</span>.data_event_triggered = <span class="bool-val">true</span>;

         <span class="bool-val">true
     </span>}

     <span class="doccomment">/// Resets the data triggered state.
     </span><span class="kw">fn </span>reset_data_event(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.data_event_triggered = <span class="bool-val">false</span>;
     }

     <span class="doccomment">/// Set the last priority update for the stream.
     </span><span class="kw">pub fn </span>set_last_priority_update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, priority_update: <span class="prelude-ty">Option</span>&lt;Vec&lt;u8&gt;&gt;) {
         <span class="self">self</span>.last_priority_update = priority_update;
     }

     <span class="doccomment">/// Take the last priority update and leave `None` in its place.
     </span><span class="kw">pub fn </span>take_last_priority_update(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Vec&lt;u8&gt;&gt; {
         <span class="self">self</span>.last_priority_update.take()
     }

     <span class="doccomment">/// Returns `true` if there is a priority update.
     </span><span class="kw">pub fn </span>has_last_priority_update(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.last_priority_update.is_some()
     }

     <span class="doccomment">/// Returns true if the state buffer has enough data to complete the state.
     </span><span class="kw">fn </span>state_buffer_complete(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.state_off == <span class="self">self</span>.state_len
     }

     <span class="doccomment">/// Transitions the stream to a new state, and optionally resets the state
     /// buffer.
     </span><span class="kw">fn </span>state_transition(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>, new_state: State, expected_len: usize, resize: bool,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="comment">// Some states don't need the state buffer, so don't resize it if not
         // necessary.
         </span><span class="kw">if </span>resize {
             <span class="comment">// A peer can influence the size of the state buffer (e.g. with the
             // payload size of a GREASE frame), so we need to limit the maximum
             // size to avoid DoS.
             </span><span class="kw">if </span>expected_len &gt; MAX_STATE_BUF_SIZE {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::ExcessiveLoad);
             }

             <span class="self">self</span>.state_buf.resize(expected_len, <span class="number">0</span>);
         }

         <span class="self">self</span>.state = new_state;
         <span class="self">self</span>.state_off = <span class="number">0</span>;
         <span class="self">self</span>.state_len = expected_len;

         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="attr">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span><span class="kw">crate</span>::h3::frame::<span class="kw-2">*</span>;

     <span class="kw">use super</span>::<span class="kw-2">*</span>;

     <span class="kw">fn </span>open_uni(b: <span class="kw-2">&amp;mut </span>octets::OctetsMut, ty: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Stream&gt; {
         <span class="kw">let </span>stream = Stream::new(<span class="number">2</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(stream.state, State::StreamType);

         b.put_varint(ty)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(stream)
     }

     <span class="kw">fn </span>parse_uni(
         stream: <span class="kw-2">&amp;mut </span>Stream, ty: u64, cursor: <span class="kw-2">&amp;mut </span>std::io::Cursor&lt;Vec&lt;u8&gt;&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         stream.try_fill_buffer_for_tests(cursor)<span class="question-mark">?</span>;

         <span class="kw">let </span>stream_ty = stream.try_consume_varint()<span class="question-mark">?</span>;
         <span class="macro">assert_eq!</span>(stream_ty, ty);
         stream.set_ty(Type::deserialize(stream_ty).unwrap())<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>parse_skip_frame(
         stream: <span class="kw-2">&amp;mut </span>Stream, cursor: <span class="kw-2">&amp;mut </span>std::io::Cursor&lt;Vec&lt;u8&gt;&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
         <span class="comment">// Parse the frame type.
         </span>stream.try_fill_buffer_for_tests(cursor)<span class="question-mark">?</span>;

         <span class="kw">let </span>frame_ty = stream.try_consume_varint()<span class="question-mark">?</span>;

         stream.set_frame_type(frame_ty)<span class="question-mark">?</span>;
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the frame payload length.
         </span>stream.try_fill_buffer_for_tests(cursor)<span class="question-mark">?</span>;

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint()<span class="question-mark">?</span>;
         stream.set_frame_payload_len(frame_payload_len)<span class="question-mark">?</span>;
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the frame payload.
         </span>stream.try_fill_buffer_for_tests(cursor)<span class="question-mark">?</span>;

         stream.try_consume_frame()<span class="question-mark">?</span>;
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="prelude-val">Ok</span>(())
     }

     <span class="attr">#[test]
     </span><span class="doccomment">/// Process incoming SETTINGS frame on control stream.
     </span><span class="kw">fn </span>control_good() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">40</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>raw_settings = <span class="macro">vec!</span>[
             (SETTINGS_MAX_FIELD_SECTION_SIZE, <span class="number">0</span>),
             (SETTINGS_QPACK_MAX_TABLE_CAPACITY, <span class="number">0</span>),
             (SETTINGS_QPACK_BLOCKED_STREAMS, <span class="number">0</span>),
         ];

         <span class="kw">let </span>frame = Frame::Settings {
             max_field_section_size: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_max_table_capacity: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_blocked_streams: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(raw_settings),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the SETTINGS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::SETTINGS_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the SETTINGS frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">6</span>);
         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the SETTINGS frame payload.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert_eq!</span>(stream.try_consume_frame(), <span class="prelude-val">Ok</span>((frame, <span class="number">6</span>)));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);
     }

     <span class="attr">#[test]
     </span><span class="doccomment">/// Process incoming empty SETTINGS frame on control stream.
     </span><span class="kw">fn </span>control_empty_settings() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">40</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>frame = Frame::Settings {
             max_field_section_size: <span class="prelude-val">None</span>,
             qpack_max_table_capacity: <span class="prelude-val">None</span>,
             qpack_blocked_streams: <span class="prelude-val">None</span>,
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[]),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the SETTINGS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::SETTINGS_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the SETTINGS frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">0</span>);
         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the SETTINGS frame payload.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert_eq!</span>(stream.try_consume_frame(), <span class="prelude-val">Ok</span>((frame, <span class="number">0</span>)));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);
     }

     <span class="attr">#[test]
     </span><span class="doccomment">/// Process duplicate SETTINGS frame on control stream.
     </span><span class="kw">fn </span>control_bad_multiple_settings() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">40</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>raw_settings = <span class="macro">vec!</span>[
             (SETTINGS_MAX_FIELD_SECTION_SIZE, <span class="number">0</span>),
             (SETTINGS_QPACK_MAX_TABLE_CAPACITY, <span class="number">0</span>),
             (SETTINGS_QPACK_BLOCKED_STREAMS, <span class="number">0</span>),
         ];

         <span class="kw">let </span>frame = frame::Frame::Settings {
             max_field_section_size: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_max_table_capacity: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_blocked_streams: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(raw_settings),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the SETTINGS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::SETTINGS_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the SETTINGS frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">6</span>);
         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the SETTINGS frame payload.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert_eq!</span>(stream.try_consume_frame(), <span class="prelude-val">Ok</span>((frame, <span class="number">6</span>)));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the second SETTINGS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(stream.set_frame_type(frame_ty), <span class="prelude-val">Err</span>(Error::FrameUnexpected));
     }

     <span class="attr">#[test]
     </span><span class="doccomment">/// Process other frame before SETTINGS frame on control stream.
     </span><span class="kw">fn </span>control_bad_late_settings() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">40</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>goaway = frame::Frame::GoAway { id: <span class="number">0 </span>};

         <span class="kw">let </span>raw_settings = <span class="macro">vec!</span>[
             (SETTINGS_MAX_FIELD_SECTION_SIZE, <span class="number">0</span>),
             (SETTINGS_QPACK_MAX_TABLE_CAPACITY, <span class="number">0</span>),
             (SETTINGS_QPACK_BLOCKED_STREAMS, <span class="number">0</span>),
         ];

         <span class="kw">let </span>settings = frame::Frame::Settings {
             max_field_section_size: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_max_table_capacity: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_blocked_streams: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(raw_settings),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         goaway.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();
         settings.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse GOAWAY.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(stream.set_frame_type(frame_ty), <span class="prelude-val">Err</span>(Error::MissingSettings));
     }

     <span class="attr">#[test]
     </span><span class="doccomment">/// Process not-allowed frame on control stream.
     </span><span class="kw">fn </span>control_bad_frame() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">40</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>header_block = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>];
         <span class="kw">let </span>hdrs = frame::Frame::Headers { header_block };

         <span class="kw">let </span>raw_settings = <span class="macro">vec!</span>[
             (SETTINGS_MAX_FIELD_SECTION_SIZE, <span class="number">0</span>),
             (SETTINGS_QPACK_MAX_TABLE_CAPACITY, <span class="number">0</span>),
             (SETTINGS_QPACK_BLOCKED_STREAMS, <span class="number">0</span>),
             (<span class="number">33</span>, <span class="number">33</span>),
         ];

         <span class="kw">let </span>settings = frame::Frame::Settings {
             max_field_section_size: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_max_table_capacity: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             qpack_blocked_streams: <span class="prelude-val">Some</span>(<span class="number">0</span>),
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(raw_settings),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         settings.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();
         hdrs.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse first SETTINGS frame.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         stream.set_frame_type(frame_ty).unwrap();

         stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         stream.set_frame_payload_len(frame_payload_len).unwrap();

         stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert!</span>(stream.try_consume_frame().is_ok());

         <span class="comment">// Parse HEADERS.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(stream.set_frame_type(frame_ty), <span class="prelude-val">Err</span>(Error::FrameUnexpected));
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>request_no_data() {
         <span class="kw">let </span><span class="kw-2">mut </span>stream = Stream::new(<span class="number">0</span>, <span class="bool-val">false</span>);

         <span class="macro">assert_eq!</span>(stream.ty, <span class="prelude-val">Some</span>(Type::Request));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="macro">assert_eq!</span>(stream.try_consume_varint(), <span class="prelude-val">Err</span>(Error::Done));
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>request_good() {
         <span class="kw">let </span><span class="kw-2">mut </span>stream = Stream::new(<span class="number">0</span>, <span class="bool-val">false</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>header_block = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>];
         <span class="kw">let </span>payload = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>];
         <span class="kw">let </span>hdrs = frame::Frame::Headers { header_block };
         <span class="kw">let </span>data = frame::Frame::Data {
             payload: payload.clone(),
         };

         hdrs.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();
         data.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         <span class="comment">// Parse the HEADERS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::HEADERS_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the HEADERS frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">12</span>);

         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the HEADERS frame.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert_eq!</span>(stream.try_consume_frame(), <span class="prelude-val">Ok</span>((hdrs, <span class="number">12</span>)));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the DATA frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::DATA_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the DATA frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">12</span>);

         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::Data);

         <span class="comment">// Parse the DATA payload.
         </span><span class="kw">let </span><span class="kw-2">mut </span>recv_buf = <span class="macro">vec!</span>[<span class="number">0</span>; payload.len()];
         <span class="macro">assert_eq!</span>(
             stream.try_consume_data_for_tests(<span class="kw-2">&amp;mut </span>cursor, <span class="kw-2">&amp;mut </span>recv_buf),
             <span class="prelude-val">Ok</span>(payload.len())
         );
         <span class="macro">assert_eq!</span>(payload, recv_buf);

         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>push_good() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>header_block = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>];
         <span class="kw">let </span>payload = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>];
         <span class="kw">let </span>hdrs = frame::Frame::Headers { header_block };
         <span class="kw">let </span>data = frame::Frame::Data {
             payload: payload.clone(),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_PUSH_STREAM_TYPE_ID).unwrap();
         b.put_varint(<span class="number">1</span>).unwrap();
         hdrs.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();
         data.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_PUSH_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::PushId);

         <span class="comment">// Parse push ID.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>push_id = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(push_id, <span class="number">1</span>);

         stream.set_push_id(push_id).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the HEADERS frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::HEADERS_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the HEADERS frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">12</span>);

         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayload);

         <span class="comment">// Parse the HEADERS frame.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="macro">assert_eq!</span>(stream.try_consume_frame(), <span class="prelude-val">Ok</span>((hdrs, <span class="number">12</span>)));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Parse the DATA frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::DATA_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse the DATA frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_payload_len, <span class="number">12</span>);

         stream.set_frame_payload_len(frame_payload_len).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::Data);

         <span class="comment">// Parse the DATA payload.
         </span><span class="kw">let </span><span class="kw-2">mut </span>recv_buf = <span class="macro">vec!</span>[<span class="number">0</span>; payload.len()];
         <span class="macro">assert_eq!</span>(
             stream.try_consume_data_for_tests(<span class="kw-2">&amp;mut </span>cursor, <span class="kw-2">&amp;mut </span>recv_buf),
             <span class="prelude-val">Ok</span>(payload.len())
         );
         <span class="macro">assert_eq!</span>(payload, recv_buf);

         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>grease() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">20</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, <span class="number">33</span>).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         <span class="comment">// Parse stream type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>stream_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(stream_ty, <span class="number">33</span>);
         stream
             .set_ty(Type::deserialize(stream_ty).unwrap())
             .unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::Drain);
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>data_before_headers() {
         <span class="kw">let </span><span class="kw-2">mut </span>stream = Stream::new(<span class="number">0</span>, <span class="bool-val">false</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>data = frame::Frame::Data {
             payload: <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>],
         };

         data.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         <span class="comment">// Parse the DATA frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::DATA_FRAME_TYPE_ID);

         <span class="macro">assert_eq!</span>(stream.set_frame_type(frame_ty), <span class="prelude-val">Err</span>(Error::FrameUnexpected));
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>zero_length_goaway() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>frame = Frame::Settings {
             max_field_section_size: <span class="prelude-val">None</span>,
             qpack_max_table_capacity: <span class="prelude-val">None</span>,
             qpack_blocked_streams: <span class="prelude-val">None</span>,
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[]),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="comment">// Write a 0-length payload frame.
         </span>b.put_varint(frame::GOAWAY_FRAME_TYPE_ID).unwrap();
         b.put_varint(<span class="number">0</span>).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();

         <span class="comment">// Skip SETTINGS frame type.
         </span>parse_skip_frame(<span class="kw-2">&amp;mut </span>stream, <span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="comment">// Parse frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::GOAWAY_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(
             <span class="prelude-val">Err</span>(Error::FrameError),
             stream.set_frame_payload_len(frame_payload_len)
         );
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>zero_length_push_promise() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span><span class="kw-2">mut </span>stream = Stream::new(<span class="number">0</span>, <span class="bool-val">false</span>);

         <span class="macro">assert_eq!</span>(stream.ty, <span class="prelude-val">Some</span>(Type::Request));
         <span class="macro">assert_eq!</span>(stream.state, State::FrameType);

         <span class="comment">// Write a 0-length payload frame.
         </span>b.put_varint(frame::PUSH_PROMISE_FRAME_TYPE_ID).unwrap();
         b.put_varint(<span class="number">0</span>).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         <span class="comment">// Parse frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::PUSH_PROMISE_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(
             <span class="prelude-val">Err</span>(Error::FrameError),
             stream.set_frame_payload_len(frame_payload_len)
         );
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>zero_length_cancel_push() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>frame = Frame::Settings {
             max_field_section_size: <span class="prelude-val">None</span>,
             qpack_max_table_capacity: <span class="prelude-val">None</span>,
             qpack_blocked_streams: <span class="prelude-val">None</span>,
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[]),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="comment">// Write a 0-length payload frame.
         </span>b.put_varint(frame::CANCEL_PUSH_FRAME_TYPE_ID).unwrap();
         b.put_varint(<span class="number">0</span>).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();

         <span class="comment">// Skip SETTINGS frame type.
         </span>parse_skip_frame(<span class="kw-2">&amp;mut </span>stream, <span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="comment">// Parse frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::CANCEL_PUSH_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(
             <span class="prelude-val">Err</span>(Error::FrameError),
             stream.set_frame_payload_len(frame_payload_len)
         );
     }

     <span class="attr">#[test]
     </span><span class="kw">fn </span>zero_length_max_push_id() {
         <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="macro">vec!</span>[<span class="number">42</span>; <span class="number">128</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&amp;mut </span>d);

         <span class="kw">let </span>frame = Frame::Settings {
             max_field_section_size: <span class="prelude-val">None</span>,
             qpack_max_table_capacity: <span class="prelude-val">None</span>,
             qpack_blocked_streams: <span class="prelude-val">None</span>,
             connect_protocol_enabled: <span class="prelude-val">None</span>,
             h3_datagram: <span class="prelude-val">None</span>,
             grease: <span class="prelude-val">None</span>,
             additional_settings: <span class="prelude-val">None</span>,
             raw: <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[]),
         };

         <span class="kw">let </span><span class="kw-2">mut </span>stream = open_uni(<span class="kw-2">&amp;mut </span>b, HTTP3_CONTROL_STREAM_TYPE_ID).unwrap();
         frame.to_bytes(<span class="kw-2">&amp;mut </span>b).unwrap();

         <span class="comment">// Write a 0-length payload frame.
         </span>b.put_varint(frame::MAX_PUSH_FRAME_TYPE_ID).unwrap();
         b.put_varint(<span class="number">0</span>).unwrap();

         <span class="kw">let </span><span class="kw-2">mut </span>cursor = std::io::Cursor::new(d);

         parse_uni(<span class="kw-2">&amp;mut </span>stream, HTTP3_CONTROL_STREAM_TYPE_ID, <span class="kw-2">&amp;mut </span>cursor)
             .unwrap();

         <span class="comment">// Skip SETTINGS frame type.
         </span>parse_skip_frame(<span class="kw-2">&amp;mut </span>stream, <span class="kw-2">&amp;mut </span>cursor).unwrap();

         <span class="comment">// Parse frame type.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_ty = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(frame_ty, frame::MAX_PUSH_FRAME_TYPE_ID);

         stream.set_frame_type(frame_ty).unwrap();
         <span class="macro">assert_eq!</span>(stream.state, State::FramePayloadLen);

         <span class="comment">// Parse frame payload length.
         </span>stream.try_fill_buffer_for_tests(<span class="kw-2">&amp;mut </span>cursor).unwrap();
         <span class="kw">let </span>frame_payload_len = stream.try_consume_varint().unwrap();
         <span class="macro">assert_eq!</span>(
             <span class="prelude-val">Err</span>(Error::FrameError),
             stream.set_frame_payload_len(frame_payload_len)
         );
     }
 }
 </code></pre></div></section></main></body></html>