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</pre><pre class='rust '>
<span class='doccomment'>//! The module contains the implementation of the `HEADERS` frame and associated flags.</span>

<span class='kw'>use</span> <span class='ident'>http</span>::<span class='ident'>StreamId</span>;
<span class='kw'>use</span> <span class='ident'>http</span>::<span class='ident'>frame</span>::{
    <span class='ident'>Flag</span>,
    <span class='ident'>Frame</span>,
    <span class='ident'>FrameHeader</span>,
    <span class='ident'>RawFrame</span>,
    <span class='ident'>pack_header</span>,
    <span class='ident'>parse_padded_payload</span>,
};

<span class='doccomment'>/// An enum representing the flags that a `HeadersFrame` can have.</span>
<span class='doccomment'>/// The integer representation associated to each variant is that flag&#39;s</span>
<span class='doccomment'>/// bitmask.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// HTTP/2 spec, section 6.2.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>PartialEq</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>HeadersFlag</span> {
    <span class='ident'>EndStream</span> <span class='op'>=</span> <span class='number'>0x1</span>,
    <span class='ident'>EndHeaders</span> <span class='op'>=</span> <span class='number'>0x4</span>,
    <span class='ident'>Padded</span> <span class='op'>=</span> <span class='number'>0x8</span>,
    <span class='ident'>Priority</span> <span class='op'>=</span> <span class='number'>0x20</span>,
}

<span class='kw'>impl</span> <span class='ident'>Flag</span> <span class='kw'>for</span> <span class='ident'>HeadersFlag</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>bitmask</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>u8</span> {
        <span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>u8</span>
    }
}

<span class='doccomment'>/// The struct represents the dependency information that can be attached to</span>
<span class='doccomment'>/// a stream and sent within a HEADERS frame (one with the Priority flag set).</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>PartialEq</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>StreamDependency</span> {
    <span class='doccomment'>/// The ID of the stream that a particular stream depends on</span>
    <span class='kw'>pub</span> <span class='ident'>stream_id</span>: <span class='ident'>StreamId</span>,
    <span class='doccomment'>/// The weight for the stream. The value exposed (and set) here is always</span>
    <span class='doccomment'>/// in the range [0, 255], instead of [1, 256] \(as defined in section 5.3.2.)</span>
    <span class='doccomment'>/// so that the value fits into a `u8`.</span>
    <span class='kw'>pub</span> <span class='ident'>weight</span>: <span class='ident'>u8</span>,
    <span class='doccomment'>/// A flag indicating whether the stream dependency is exclusive.</span>
    <span class='kw'>pub</span> <span class='ident'>is_exclusive</span>: <span class='ident'>bool</span>,
}

<span class='kw'>impl</span> <span class='ident'>StreamDependency</span> {
    <span class='doccomment'>/// Creates a new `StreamDependency` with the given stream ID, weight, and</span>
    <span class='doccomment'>/// exclusivity.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>stream_id</span>: <span class='ident'>StreamId</span>, <span class='ident'>weight</span>: <span class='ident'>u8</span>, <span class='ident'>is_exclusive</span>: <span class='ident'>bool</span>)
            <span class='op'>-&gt;</span> <span class='ident'>StreamDependency</span> {
        <span class='ident'>StreamDependency</span> {
            <span class='ident'>stream_id</span>: <span class='ident'>stream_id</span>,
            <span class='ident'>weight</span>: <span class='ident'>weight</span>,
            <span class='ident'>is_exclusive</span>: <span class='ident'>is_exclusive</span>,
        }
    }

    <span class='doccomment'>/// Parses the first 5 bytes in the buffer as a `StreamDependency`.</span>
    <span class='doccomment'>/// (Each 5-byte sequence is always decodable into a stream dependency</span>
    <span class='doccomment'>/// structure).</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Panics</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If the given buffer has less than 5 elements, the method will panic.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>buf</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='ident'>StreamDependency</span> {
        <span class='comment'>// The most significant bit of the first byte is the &quot;E&quot; bit indicating</span>
        <span class='comment'>// whether the dependency is exclusive.</span>
        <span class='kw'>let</span> <span class='ident'>is_exclusive</span> <span class='op'>=</span> <span class='ident'>buf</span>[<span class='number'>0</span>] <span class='kw-2'>&amp;</span> <span class='number'>0x80</span> <span class='op'>!=</span> <span class='number'>0</span>;
        <span class='kw'>let</span> <span class='ident'>stream_id</span> <span class='op'>=</span> {
            <span class='comment'>// Parse the first 4 bytes into a u32...</span>
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>id</span> <span class='op'>=</span> <span class='macro'>unpack_octets_4</span><span class='macro'>!</span>(<span class='ident'>buf</span>, <span class='number'>0</span>, <span class='ident'>u32</span>);
            <span class='comment'>// ...clear the first bit since the stream id is only 31 bits.</span>
            <span class='ident'>id</span> <span class='op'>&amp;=</span> <span class='op'>!</span>(<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>31</span>);
            <span class='ident'>id</span>
        };

        <span class='ident'>StreamDependency</span> {
            <span class='ident'>stream_id</span>: <span class='ident'>stream_id</span>,
            <span class='ident'>weight</span>: <span class='ident'>buf</span>[<span class='number'>4</span>],
            <span class='ident'>is_exclusive</span>: <span class='ident'>is_exclusive</span>,
        }
    }

    <span class='doccomment'>/// Serializes the `StreamDependency` into a 5-byte buffer representing the</span>
    <span class='doccomment'>/// dependency description, as described in section 6.2. of the HTTP/2</span>
    <span class='doccomment'>/// spec:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```notest</span>
    <span class='doccomment'>///  0                   1                   2                   3</span>
    <span class='doccomment'>///  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</span>
    <span class='doccomment'>/// +-+-------------+-----------------------------------------------+</span>
    <span class='doccomment'>/// |E|                 Stream Dependency  (31)                     |</span>
    <span class='doccomment'>/// +-+-------------+-----------------------------------------------+</span>
    <span class='doccomment'>/// |  Weight  (8)  |</span>
    <span class='doccomment'>/// +-+-------------+-----------------------------------------------+</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Where &quot;E&quot; is set if the dependency is exclusive.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>serialize</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> [<span class='ident'>u8</span>; <span class='number'>5</span>] {
        <span class='kw'>let</span> <span class='ident'>e_bit</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_exclusive</span> {
            <span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>7</span>
        } <span class='kw'>else</span> {
            <span class='number'>0</span>
        };
        [
            (((<span class='self'>self</span>.<span class='ident'>stream_id</span> <span class='op'>&gt;&gt;</span> <span class='number'>24</span>) <span class='kw-2'>&amp;</span> <span class='number'>0x000000FF</span>) <span class='kw'>as</span> <span class='ident'>u8</span>) <span class='op'>|</span> <span class='ident'>e_bit</span>,
            (((<span class='self'>self</span>.<span class='ident'>stream_id</span> <span class='op'>&gt;&gt;</span> <span class='number'>16</span>) <span class='kw-2'>&amp;</span> <span class='number'>0x000000FF</span>) <span class='kw'>as</span> <span class='ident'>u8</span>),
            (((<span class='self'>self</span>.<span class='ident'>stream_id</span> <span class='op'>&gt;&gt;</span>  <span class='number'>8</span>) <span class='kw-2'>&amp;</span> <span class='number'>0x000000FF</span>) <span class='kw'>as</span> <span class='ident'>u8</span>),
            (((<span class='self'>self</span>.<span class='ident'>stream_id</span> <span class='op'>&gt;&gt;</span>  <span class='number'>0</span>) <span class='kw-2'>&amp;</span> <span class='number'>0x000000FF</span>) <span class='kw'>as</span> <span class='ident'>u8</span>),
            <span class='self'>self</span>.<span class='ident'>weight</span>,
        ]
    }
}

<span class='doccomment'>/// A struct representing the HEADERS frames of HTTP/2, as defined in the</span>
<span class='doccomment'>/// HTTP/2 spec, section 6.2.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>PartialEq</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>HeadersFrame</span> {
    <span class='doccomment'>/// The header fragment bytes stored within the frame.</span>
    <span class='kw'>pub</span> <span class='ident'>header_fragment</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>,
    <span class='doccomment'>/// The ID of the stream with which this frame is associated</span>
    <span class='kw'>pub</span> <span class='ident'>stream_id</span>: <span class='ident'>StreamId</span>,
    <span class='doccomment'>/// The stream dependency information, if any.</span>
    <span class='kw'>pub</span> <span class='ident'>stream_dep</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>StreamDependency</span><span class='op'>&gt;</span>,
    <span class='doccomment'>/// The length of the padding, if any.</span>
    <span class='kw'>pub</span> <span class='ident'>padding_len</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>,
    <span class='doccomment'>/// The set of flags for the frame, packed into a single byte.</span>
    <span class='ident'>flags</span>: <span class='ident'>u8</span>,
}

<span class='kw'>impl</span> <span class='ident'>HeadersFrame</span> {
    <span class='doccomment'>/// Creates a new `HeadersFrame` with the given header fragment and stream</span>
    <span class='doccomment'>/// ID. No padding, no stream dependency, and no flags are set.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>fragment</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>, <span class='ident'>stream_id</span>: <span class='ident'>StreamId</span>) <span class='op'>-&gt;</span> <span class='ident'>HeadersFrame</span> {
        <span class='ident'>HeadersFrame</span> {
            <span class='ident'>header_fragment</span>: <span class='ident'>fragment</span>,
            <span class='ident'>stream_id</span>: <span class='ident'>stream_id</span>,
            <span class='ident'>stream_dep</span>: <span class='prelude-val'>None</span>,
            <span class='ident'>padding_len</span>: <span class='prelude-val'>None</span>,
            <span class='ident'>flags</span>: <span class='number'>0</span>,
        }
    }

    <span class='doccomment'>/// Creates a new `HeadersFrame` with the given header fragment, stream ID</span>
    <span class='doccomment'>/// and stream dependency information. No padding and no flags are set.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_dependency</span>(
            <span class='ident'>fragment</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>,
            <span class='ident'>stream_id</span>: <span class='ident'>StreamId</span>,
            <span class='ident'>stream_dep</span>: <span class='ident'>StreamDependency</span>) <span class='op'>-&gt;</span> <span class='ident'>HeadersFrame</span> {
        <span class='ident'>HeadersFrame</span> {
            <span class='ident'>header_fragment</span>: <span class='ident'>fragment</span>,
            <span class='ident'>stream_id</span>: <span class='ident'>stream_id</span>,
            <span class='ident'>stream_dep</span>: <span class='prelude-val'>Some</span>(<span class='ident'>stream_dep</span>),
            <span class='ident'>padding_len</span>: <span class='prelude-val'>None</span>,
            <span class='ident'>flags</span>: <span class='ident'>HeadersFlag</span>::<span class='ident'>Priority</span>.<span class='ident'>bitmask</span>(),
        }
    }

    <span class='doccomment'>/// Returns whether this frame ends the headers. If not, there MUST be a</span>
    <span class='doccomment'>/// number of follow up CONTINUATION frames that send the rest of the</span>
    <span class='doccomment'>/// header data.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_headers_end</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>EndHeaders</span>)
    }

    <span class='doccomment'>/// Returns whther this frame ends the stream it is associated with.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_end_of_stream</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>EndStream</span>)
    }

    <span class='doccomment'>/// Sets the padding length for the frame, as well as the corresponding</span>
    <span class='doccomment'>/// Padded flag.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_padding</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>padding_len</span>: <span class='ident'>u8</span>) {
        <span class='self'>self</span>.<span class='ident'>padding_len</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>padding_len</span>);
        <span class='self'>self</span>.<span class='ident'>set_flag</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>Padded</span>);
    }

    <span class='doccomment'>/// Returns the length of the payload of the current frame, including any</span>
    <span class='doccomment'>/// possible padding in the number of bytes.</span>
    <span class='kw'>fn</span> <span class='ident'>payload_len</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>u32</span> {
        <span class='kw'>let</span> <span class='ident'>padding</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>Padded</span>) {
            <span class='number'>1</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>padding_len</span>.<span class='ident'>unwrap_or</span>(<span class='number'>0</span>) <span class='kw'>as</span> <span class='ident'>u32</span>
        } <span class='kw'>else</span> {
            <span class='number'>0</span>
        };
        <span class='kw'>let</span> <span class='ident'>priority</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>Priority</span>) {
            <span class='number'>5</span>
        } <span class='kw'>else</span> {
            <span class='number'>0</span>
        };

        <span class='self'>self</span>.<span class='ident'>header_fragment</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='ident'>priority</span> <span class='op'>+</span> <span class='ident'>padding</span>
    }
}

<span class='kw'>impl</span> <span class='ident'>Frame</span> <span class='kw'>for</span> <span class='ident'>HeadersFrame</span> {
    <span class='doccomment'>/// The type that represents the flags that the particular `Frame` can take.</span>
    <span class='doccomment'>/// This makes sure that only valid `Flag`s are used with each `Frame`.</span>
    <span class='kw'>type</span> <span class='ident'>FlagType</span> <span class='op'>=</span> <span class='ident'>HeadersFlag</span>;

    <span class='doccomment'>/// Creates a new `HeadersFrame` with the given `RawFrame` (i.e. header and</span>
    <span class='doccomment'>/// payload), if possible.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Returns</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// `None` if a valid `HeadersFrame` cannot be constructed from the given</span>
    <span class='doccomment'>/// `RawFrame`. The stream ID *must not* be 0.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Otherwise, returns a newly constructed `HeadersFrame`.</span>
    <span class='kw'>fn</span> <span class='ident'>from_raw</span>(<span class='ident'>raw_frame</span>: <span class='ident'>RawFrame</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span> {
        <span class='comment'>// Unpack the header</span>
        <span class='kw'>let</span> (<span class='ident'>len</span>, <span class='ident'>frame_type</span>, <span class='ident'>flags</span>, <span class='ident'>stream_id</span>) <span class='op'>=</span> <span class='ident'>raw_frame</span>.<span class='ident'>header</span>();
        <span class='comment'>// Check that the frame type is correct for this frame implementation</span>
        <span class='kw'>if</span> <span class='ident'>frame_type</span> <span class='op'>!=</span> <span class='number'>0x1</span> {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>;
        }
        <span class='comment'>// Check that the length given in the header matches the payload</span>
        <span class='comment'>// length; if not, something went wrong and we do not consider this a</span>
        <span class='comment'>// valid frame.</span>
        <span class='kw'>if</span> (<span class='ident'>len</span> <span class='kw'>as</span> <span class='ident'>usize</span>) <span class='op'>!=</span> <span class='ident'>raw_frame</span>.<span class='ident'>payload</span>().<span class='ident'>len</span>() {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>;
        }
        <span class='comment'>// Check that the HEADERS frame is not associated to stream 0</span>
        <span class='kw'>if</span> <span class='ident'>stream_id</span> <span class='op'>==</span> <span class='number'>0</span> {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>;
        }

        <span class='comment'>// First, we get a slice containing the actual payload, depending on if</span>
        <span class='comment'>// the frame is padded.</span>
        <span class='kw'>let</span> <span class='ident'>padded</span> <span class='op'>=</span> (<span class='ident'>flags</span> <span class='kw-2'>&amp;</span> <span class='ident'>HeadersFlag</span>::<span class='ident'>Padded</span>.<span class='ident'>bitmask</span>()) <span class='op'>!=</span> <span class='number'>0</span>;
        <span class='kw'>let</span> (<span class='ident'>actual</span>, <span class='ident'>pad_len</span>) <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>padded</span> {
            <span class='kw'>match</span> <span class='ident'>parse_padded_payload</span>(<span class='kw-2'>&amp;</span><span class='ident'>raw_frame</span>.<span class='ident'>payload</span>()) {
                <span class='prelude-val'>Some</span>((<span class='ident'>data</span>, <span class='ident'>pad_len</span>)) <span class='op'>=&gt;</span> (<span class='ident'>data</span>, <span class='prelude-val'>Some</span>(<span class='ident'>pad_len</span>)),
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
            }
        } <span class='kw'>else</span> {
            (<span class='ident'>raw_frame</span>.<span class='ident'>payload</span>(), <span class='prelude-val'>None</span>)
        };

        <span class='comment'>// From the actual payload we extract the stream dependency info, if</span>
        <span class='comment'>// the appropriate flag is set.</span>
        <span class='kw'>let</span> <span class='ident'>priority</span> <span class='op'>=</span> (<span class='ident'>flags</span> <span class='kw-2'>&amp;</span> <span class='ident'>HeadersFlag</span>::<span class='ident'>Priority</span>.<span class='ident'>bitmask</span>()) <span class='op'>!=</span> <span class='number'>0</span>;
        <span class='kw'>let</span> (<span class='ident'>data</span>, <span class='ident'>stream_dep</span>) <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>priority</span> {
            (<span class='kw-2'>&amp;</span><span class='ident'>actual</span>[<span class='number'>5</span>..], <span class='prelude-val'>Some</span>(<span class='ident'>StreamDependency</span>::<span class='ident'>parse</span>(<span class='kw-2'>&amp;</span><span class='ident'>actual</span>[..<span class='number'>5</span>])))
        } <span class='kw'>else</span> {
            (<span class='ident'>actual</span>, <span class='prelude-val'>None</span>)
        };

        <span class='prelude-val'>Some</span>(<span class='ident'>HeadersFrame</span> {
            <span class='ident'>header_fragment</span>: <span class='ident'>data</span>.<span class='ident'>to_vec</span>(),
            <span class='ident'>stream_id</span>: <span class='ident'>stream_id</span>,
            <span class='ident'>stream_dep</span>: <span class='ident'>stream_dep</span>,
            <span class='ident'>padding_len</span>: <span class='ident'>pad_len</span>,
            <span class='ident'>flags</span>: <span class='ident'>flags</span>,
        })
    }

    <span class='doccomment'>/// Tests if the given flag is set for the frame.</span>
    <span class='kw'>fn</span> <span class='ident'>is_set</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>flag</span>: <span class='ident'>HeadersFlag</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        (<span class='self'>self</span>.<span class='ident'>flags</span> <span class='kw-2'>&amp;</span> <span class='ident'>flag</span>.<span class='ident'>bitmask</span>()) <span class='op'>!=</span> <span class='number'>0</span>
    }

    <span class='doccomment'>/// Returns the `StreamId` of the stream to which the frame is associated.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// A `SettingsFrame` always has to be associated to stream `0`.</span>
    <span class='kw'>fn</span> <span class='ident'>get_stream_id</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>StreamId</span> {
        <span class='self'>self</span>.<span class='ident'>stream_id</span>
    }

    <span class='doccomment'>/// Returns a `FrameHeader` based on the current state of the `Frame`.</span>
    <span class='kw'>fn</span> <span class='ident'>get_header</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>FrameHeader</span> {
        (<span class='self'>self</span>.<span class='ident'>payload_len</span>(), <span class='number'>0x1</span>, <span class='self'>self</span>.<span class='ident'>flags</span>, <span class='self'>self</span>.<span class='ident'>stream_id</span>)
    }

    <span class='doccomment'>/// Sets the given flag for the frame.</span>
    <span class='kw'>fn</span> <span class='ident'>set_flag</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>flag</span>: <span class='ident'>HeadersFlag</span>) {
        <span class='self'>self</span>.<span class='ident'>flags</span> <span class='op'>|=</span> <span class='ident'>flag</span>.<span class='ident'>bitmask</span>();
    }

    <span class='doccomment'>/// Returns a `Vec` with the serialized representation of the frame.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Panics</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If the `HeadersFlag::Priority` flag was set, but no stream dependency</span>
    <span class='doccomment'>/// information is given (i.e. `stream_dep` is `None`).</span>
    <span class='kw'>fn</span> <span class='ident'>serialize</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='self'>self</span>.<span class='ident'>payload_len</span>() <span class='kw'>as</span> <span class='ident'>usize</span>);
        <span class='comment'>// First the header...</span>
        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>pack_header</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>get_header</span>()).<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
        <span class='comment'>// Now the length of the padding, if any.</span>
        <span class='kw'>let</span> <span class='ident'>padded</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>Padded</span>);
        <span class='kw'>if</span> <span class='ident'>padded</span> {
            <span class='ident'>buf</span>.<span class='ident'>push</span>(<span class='self'>self</span>.<span class='ident'>padding_len</span>.<span class='ident'>unwrap_or</span>(<span class='number'>0</span>));
        }
        <span class='comment'>// The stream dependency fields follow, if the priority flag is set</span>
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_set</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>Priority</span>) {
            <span class='kw'>let</span> <span class='ident'>dep_buf</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>stream_dep</span> {
                <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>dep</span>) <span class='op'>=&gt;</span> <span class='ident'>dep</span>.<span class='ident'>serialize</span>(),
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>&quot;Priority flag set, but no dependency information given&quot;</span>),
            };
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>dep_buf</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
        }
        <span class='comment'>// Now the actual headers fragment</span>
        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='self'>self</span>.<span class='ident'>header_fragment</span>.<span class='ident'>clone</span>().<span class='ident'>into_iter</span>());
        <span class='comment'>// Finally, add the trailing padding, if required</span>
        <span class='kw'>if</span> <span class='ident'>padded</span> {
            <span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='self'>self</span>.<span class='ident'>padding_len</span>.<span class='ident'>unwrap_or</span>(<span class='number'>0</span>) { <span class='ident'>buf</span>.<span class='ident'>push</span>(<span class='number'>0</span>); }
        }

        <span class='ident'>buf</span>
    }
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
    <span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>HeadersFrame</span>, <span class='ident'>HeadersFlag</span>, <span class='ident'>StreamDependency</span>};
    <span class='kw'>use</span> <span class='ident'>http</span>::<span class='ident'>frame</span>::<span class='ident'>tests</span>::{<span class='ident'>build_test_frame</span>, <span class='ident'>build_padded_frame_payload</span>};
    <span class='kw'>use</span> <span class='ident'>http</span>::<span class='ident'>frame</span>::{<span class='ident'>pack_header</span>, <span class='ident'>Frame</span>, <span class='ident'>RawFrame</span>};

    <span class='doccomment'>/// Tests that a stream dependency structure can be correctly parsed by the</span>
    <span class='doccomment'>/// `StreamDependency::parse` method.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_parse_stream_dependency</span>() {
        {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>5</span>];

            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>parse</span>(<span class='kw-2'>&amp;</span><span class='ident'>buf</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>stream_id</span>, <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>weight</span>, <span class='number'>5</span>);
            <span class='comment'>// This one was not exclusive!</span>
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>dep</span>.<span class='ident'>is_exclusive</span>)
        }
        {
            <span class='comment'>// Most significant bit set =&gt; is exclusive!</span>
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>128</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>5</span>];

            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>parse</span>(<span class='kw-2'>&amp;</span><span class='ident'>buf</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>stream_id</span>, <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>weight</span>, <span class='number'>5</span>);
            <span class='comment'>// This one was indeed exclusive!</span>
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>is_exclusive</span>)
        }
        {
            <span class='comment'>// Most significant bit set =&gt; is exclusive!</span>
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>5</span>];

            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>parse</span>(<span class='kw-2'>&amp;</span><span class='ident'>buf</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>stream_id</span>, (<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>31</span>) <span class='op'>-</span> <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>weight</span>, <span class='number'>5</span>);
            <span class='comment'>// This one was indeed exclusive!</span>
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>is_exclusive</span>);
        }
        {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>127</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>5</span>];

            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>parse</span>(<span class='kw-2'>&amp;</span><span class='ident'>buf</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>stream_id</span>, (<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>31</span>) <span class='op'>-</span> <span class='number'>1</span>);
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>dep</span>.<span class='ident'>weight</span>, <span class='number'>5</span>);
            <span class='comment'>// This one was not exclusive!</span>
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>dep</span>.<span class='ident'>is_exclusive</span>);
        }
    }

    <span class='doccomment'>/// Tests that a stream dependency structure can be correctly serialized by</span>
    <span class='doccomment'>/// the `StreamDependency::serialize` method.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_serialize_stream_dependency</span>() {
        {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>5</span>];
            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>1</span>, <span class='number'>5</span>, <span class='bool-val'>false</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>buf</span>, <span class='ident'>dep</span>.<span class='ident'>serialize</span>());
        }
        {
            <span class='comment'>// Most significant bit set =&gt; is exclusive!</span>
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>128</span>, <span class='number'>0</span>, <span class='number'>0</span>, <span class='number'>1</span>, <span class='number'>5</span>];
            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>1</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>buf</span>, <span class='ident'>dep</span>.<span class='ident'>serialize</span>());
        }
        {
            <span class='comment'>// Most significant bit set =&gt; is exclusive!</span>
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>5</span>];
            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>((<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>31</span>) <span class='op'>-</span> <span class='number'>1</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>buf</span>, <span class='ident'>dep</span>.<span class='ident'>serialize</span>());
        }
        {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>127</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>255</span>, <span class='number'>5</span>];
            <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>((<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>31</span>) <span class='op'>-</span> <span class='number'>1</span>, <span class='number'>5</span>, <span class='bool-val'>false</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>buf</span>, <span class='ident'>dep</span>.<span class='ident'>serialize</span>());
        }
    }

    <span class='doccomment'>/// Tests that a simple HEADERS frame is correctly parsed. The frame does</span>
    <span class='doccomment'>/// not contain any padding nor priority information.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_simple</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>data</span>.<span class='ident'>to_vec</span>();
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0</span>, <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>build_test_frame</span>::<span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>, <span class='kw-2'>&amp;</span><span class='ident'>payload</span>);

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>header_fragment</span>, <span class='ident'>data</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>flags</span>, <span class='number'>0</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>get_stream_id</span>(), <span class='number'>1</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>stream_dep</span>.<span class='ident'>is_none</span>());
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>padding_len</span>.<span class='ident'>is_none</span>());
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with padding is correctly parsed.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_with_padding</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>build_padded_frame_payload</span>(<span class='ident'>data</span>, <span class='number'>6</span>);
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x08</span>, <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>build_test_frame</span>::<span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>, <span class='kw-2'>&amp;</span><span class='ident'>payload</span>);

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>header_fragment</span>, <span class='ident'>data</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>flags</span>, <span class='number'>8</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>get_stream_id</span>(), <span class='number'>1</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>stream_dep</span>.<span class='ident'>is_none</span>());
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>padding_len</span>.<span class='ident'>unwrap</span>(), <span class='number'>6</span>);
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with the priority flag (and necessary fields)</span>
    <span class='doccomment'>/// is correctly parsed.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_with_priority</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>0</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>dep</span>.<span class='ident'>serialize</span>().<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());

            <span class='ident'>buf</span>
        };
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x20</span>, <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>build_test_frame</span>::<span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>, <span class='kw-2'>&amp;</span><span class='ident'>payload</span>);

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>header_fragment</span>, <span class='ident'>data</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>flags</span>, <span class='number'>0x20</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>get_stream_id</span>(), <span class='number'>1</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>stream_dep</span>.<span class='ident'>unwrap</span>(), <span class='ident'>dep</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>padding_len</span>.<span class='ident'>is_none</span>());
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with both padding and priority gets</span>
    <span class='doccomment'>/// correctly parsed.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_padding_and_priority</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>0</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);
        <span class='kw'>let</span> <span class='ident'>full</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>dep</span>.<span class='ident'>serialize</span>().<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());

            <span class='ident'>buf</span>
        };
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>build_padded_frame_payload</span>(<span class='kw-2'>&amp;</span><span class='ident'>full</span>, <span class='number'>4</span>);
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x20</span> <span class='op'>|</span> <span class='number'>0x8</span>, <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>build_test_frame</span>::<span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>, <span class='kw-2'>&amp;</span><span class='ident'>payload</span>);

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>header_fragment</span>, <span class='ident'>data</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>flags</span>, <span class='number'>0x20</span> <span class='op'>|</span> <span class='number'>0x8</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>get_stream_id</span>(), <span class='number'>1</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>stream_dep</span>.<span class='ident'>unwrap</span>(), <span class='ident'>dep</span>);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>padding_len</span>.<span class='ident'>unwrap</span>(), <span class='number'>4</span>);
    }

    <span class='doccomment'>/// Tests that a HEADERS with stream ID 0 is considered invalid.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_invalid_stream_id</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>data</span>.<span class='ident'>to_vec</span>();
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0</span>, <span class='number'>0</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Frame</span>::<span class='ident'>from_raw</span>(
            <span class='ident'>RawFrame</span>::<span class='ident'>with_payload</span>(<span class='ident'>header</span>, <span class='ident'>payload</span>));
        
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>is_none</span>());
    }

    <span class='doccomment'>/// Tests that the `HeadersFrame::parse` method considers any frame with</span>
    <span class='doccomment'>/// a frame ID other than 1 in the frame header invalid.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_parse_invalid_type</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>data</span>.<span class='ident'>to_vec</span>();
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x2</span>, <span class='number'>0</span>, <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>frame</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>HeadersFrame</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Frame</span>::<span class='ident'>from_raw</span>(
            <span class='ident'>RawFrame</span>::<span class='ident'>with_payload</span>(<span class='ident'>header</span>, <span class='ident'>payload</span>));
        
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>is_none</span>());
    }

    <span class='doccomment'>/// Tests that a simple HEADERS frame (no padding, no priority) gets</span>
    <span class='doccomment'>/// correctly serialized.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_serialize_simple</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>data</span>.<span class='ident'>to_vec</span>();
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0</span>, <span class='number'>1</span>);
        <span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>pack_header</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>);
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>res</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>headers</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>payload</span>.<span class='ident'>into_iter</span>());

            <span class='ident'>res</span>
        };
        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>HeadersFrame</span>::<span class='ident'>new</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>(), <span class='number'>1</span>);

        <span class='kw'>let</span> <span class='ident'>actual</span> <span class='op'>=</span> <span class='ident'>frame</span>.<span class='ident'>serialize</span>();

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>actual</span>);
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with padding is correctly serialized.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_serialize_with_padding</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>build_padded_frame_payload</span>(<span class='ident'>data</span>, <span class='number'>6</span>);
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x08</span>, <span class='number'>1</span>);
        <span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>pack_header</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>);
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>res</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>headers</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>payload</span>.<span class='ident'>into_iter</span>());

            <span class='ident'>res</span>
        };
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>HeadersFrame</span>::<span class='ident'>new</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>(), <span class='number'>1</span>);
        <span class='ident'>frame</span>.<span class='ident'>set_padding</span>(<span class='number'>6</span>);

        <span class='kw'>let</span> <span class='ident'>actual</span> <span class='op'>=</span> <span class='ident'>frame</span>.<span class='ident'>serialize</span>();

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>actual</span>);
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with priority gets correctly serialized.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_serialize_with_priority</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>0</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>dep</span>.<span class='ident'>serialize</span>().<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());

            <span class='ident'>buf</span>
        };
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x20</span>, <span class='number'>1</span>);
        <span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>pack_header</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>);
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>res</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>headers</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>payload</span>.<span class='ident'>into_iter</span>());

            <span class='ident'>res</span>
        };
        <span class='kw'>let</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>HeadersFrame</span>::<span class='ident'>with_dependency</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>(), <span class='number'>1</span>, <span class='ident'>dep</span>.<span class='ident'>clone</span>());

        <span class='kw'>let</span> <span class='ident'>actual</span> <span class='op'>=</span> <span class='ident'>frame</span>.<span class='ident'>serialize</span>();

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>actual</span>);
    }

    <span class='doccomment'>/// Tests that a HEADERS frame with both padding and a priority gets correctly</span>
    <span class='doccomment'>/// serialized.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_serialize_padding_and_priority</span>() {
        <span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;123&quot;</span>;
        <span class='kw'>let</span> <span class='ident'>dep</span> <span class='op'>=</span> <span class='ident'>StreamDependency</span>::<span class='ident'>new</span>(<span class='number'>0</span>, <span class='number'>5</span>, <span class='bool-val'>true</span>);
        <span class='kw'>let</span> <span class='ident'>full</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>dep</span>.<span class='ident'>serialize</span>().<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());

            <span class='ident'>buf</span>
        };
        <span class='kw'>let</span> <span class='ident'>payload</span> <span class='op'>=</span> <span class='ident'>build_padded_frame_payload</span>(<span class='kw-2'>&amp;</span><span class='ident'>full</span>, <span class='number'>4</span>);
        <span class='kw'>let</span> <span class='ident'>header</span> <span class='op'>=</span> (<span class='ident'>payload</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='number'>0x1</span>, <span class='number'>0x20</span> <span class='op'>|</span> <span class='number'>0x8</span>, <span class='number'>1</span>);
        <span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> {
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>pack_header</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>);
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>res</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>new</span>();
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>headers</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
            <span class='ident'>res</span>.<span class='ident'>extend</span>(<span class='ident'>payload</span>.<span class='ident'>into_iter</span>());

            <span class='ident'>res</span>
        };
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>HeadersFrame</span>::<span class='ident'>with_dependency</span>(<span class='ident'>data</span>.<span class='ident'>to_vec</span>(), <span class='number'>1</span>, <span class='ident'>dep</span>.<span class='ident'>clone</span>());
        <span class='ident'>frame</span>.<span class='ident'>set_padding</span>(<span class='number'>4</span>);

        <span class='kw'>let</span> <span class='ident'>actual</span> <span class='op'>=</span> <span class='ident'>frame</span>.<span class='ident'>serialize</span>();

        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>actual</span>);
    }

    <span class='doccomment'>/// Tests that the `HeadersFrame::is_headers_end` method returns the correct</span>
    <span class='doccomment'>/// value depending on the `EndHeaders` flag being set or not.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_headers_frame_is_headers_end</span>() {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>frame</span> <span class='op'>=</span> <span class='ident'>HeadersFrame</span>::<span class='ident'>new</span>(<span class='macro'>vec</span><span class='macro'>!</span>[], <span class='number'>1</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>frame</span>.<span class='ident'>is_headers_end</span>());

        <span class='ident'>frame</span>.<span class='ident'>set_flag</span>(<span class='ident'>HeadersFlag</span>::<span class='ident'>EndHeaders</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>frame</span>.<span class='ident'>is_headers_end</span>());
    }
}
</pre>
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