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</pre><pre class='rust '>
<span class='doccomment'>//! Implements all functionality related to encoding header blocks using</span>
<span class='doccomment'>//! HPACK.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Clients should use the `Encoder` struct as the API for performing HPACK</span>
<span class='doccomment'>//! encoding.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Examples</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Encodes a header using a literal encoding.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! use hpack::Encoder;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! let mut encoder = Encoder::new();</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! let headers = vec![</span>
<span class='doccomment'>//!     (b&quot;custom-key&quot;.to_vec(), b&quot;custom-value&quot;.to_vec()),</span>
<span class='doccomment'>//! ];</span>
<span class='doccomment'>//! // First encoding...</span>
<span class='doccomment'>//! let result = encoder.encode(&amp;headers);</span>
<span class='doccomment'>//! // The result is a literal encoding of the header name and value, with an</span>
<span class='doccomment'>//! // initial byte representing the type of the encoding</span>
<span class='doccomment'>//! // (incremental indexing).</span>
<span class='doccomment'>//! assert_eq!(</span>
<span class='doccomment'>//!     vec![0x40,</span>
<span class='doccomment'>//!          10, b&#39;c&#39;, b&#39;u&#39;, b&#39;s&#39;, b&#39;t&#39;, b&#39;o&#39;, b&#39;m&#39;, b&#39;-&#39;, b&#39;k&#39;, b&#39;e&#39;, b&#39;y&#39;,</span>
<span class='doccomment'>//!          12, b&#39;c&#39;, b&#39;u&#39;, b&#39;s&#39;, b&#39;t&#39;, b&#39;o&#39;, b&#39;m&#39;, b&#39;-&#39;, b&#39;v&#39;, b&#39;a&#39;, b&#39;l&#39;,</span>
<span class='doccomment'>//!          b&#39;u&#39;, b&#39;e&#39;],</span>
<span class='doccomment'>//!     result);</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Encodes some pseudo-headers that are already found in the static table.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! use hpack::Encoder;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! let mut encoder = Encoder::new();</span>
<span class='doccomment'>//! let headers = vec![</span>
<span class='doccomment'>//!     (b&quot;:method&quot;.to_vec(), b&quot;GET&quot;.to_vec()),</span>
<span class='doccomment'>//!     (b&quot;:path&quot;.to_vec(), b&quot;/&quot;.to_vec()),</span>
<span class='doccomment'>//! ];</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! // The headers are encoded by providing their index (with a bit flag</span>
<span class='doccomment'>//! // indicating that the indexed representation is used).</span>
<span class='doccomment'>//! assert_eq!(encoder.encode(&amp;headers), vec![2 | 0x80, 4 | 0x80]);</span>
<span class='doccomment'>//! ```</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>num</span>::<span class='ident'>Wrapping</span>;

<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>STATIC_TABLE</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>HeaderTable</span>;


<span class='doccomment'>/// Encode an integer to the representation defined by HPACK.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Returns a newly allocated `Vec` containing the encoded bytes.</span>
<span class='doccomment'>/// Only `prefix_size` lowest-order bits of the first byte in the</span>
<span class='doccomment'>/// array are guaranteed to be used.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>encode_integer</span>(<span class='kw-2'>mut</span> <span class='ident'>value</span>: <span class='ident'>usize</span>, <span class='ident'>prefix_size</span>: <span class='ident'>u8</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='ident'>Wrapping</span>(<span class='ident'>mask</span>) <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>prefix_size</span> <span class='op'>&gt;=</span> <span class='number'>8</span> {
        <span class='ident'>Wrapping</span>(<span class='number'>0xFF</span>)
    } <span class='kw'>else</span> {
        <span class='ident'>Wrapping</span>(<span class='number'>1u8</span> <span class='op'>&lt;&lt;</span> <span class='ident'>prefix_size</span>) <span class='op'>-</span> <span class='ident'>Wrapping</span>(<span class='number'>1</span>)
    };
    <span class='kw'>let</span> <span class='ident'>mask</span> <span class='op'>=</span> <span class='ident'>mask</span> <span class='kw'>as</span> <span class='ident'>usize</span>;
    <span class='kw'>if</span> <span class='ident'>value</span> <span class='op'>&lt;</span> <span class='ident'>mask</span> {
        <span class='comment'>// Right now, the caller would need to be the one to combine</span>
        <span class='comment'>// the other part of the prefix byte (but would know that it&#39;s</span>
        <span class='comment'>// safe to do so using the bit-wise or).</span>
        <span class='kw'>return</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>value</span> <span class='kw'>as</span> <span class='ident'>u8</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'>push</span>(<span class='ident'>mask</span> <span class='kw'>as</span> <span class='ident'>u8</span>);
    <span class='ident'>value</span> <span class='op'>-=</span> <span class='ident'>mask</span>;
    <span class='kw'>while</span> <span class='ident'>value</span> <span class='op'>&gt;=</span> <span class='number'>128</span> {
        <span class='ident'>res</span>.<span class='ident'>push</span>(((<span class='ident'>value</span> <span class='op'>%</span> <span class='number'>128</span>) <span class='op'>+</span> <span class='number'>128</span>) <span class='kw'>as</span> <span class='ident'>u8</span>);
        <span class='ident'>value</span> <span class='op'>=</span> <span class='ident'>value</span> <span class='op'>/</span> <span class='number'>128</span>;
    }
    <span class='ident'>res</span>.<span class='ident'>push</span>(<span class='ident'>value</span> <span class='kw'>as</span> <span class='ident'>u8</span>);

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

<span class='doccomment'>/// Represents an HPACK encoder. Allows clients to encode arbitrary header sets</span>
<span class='doccomment'>/// and tracks the encoding context. That is, encoding subsequent header sets</span>
<span class='doccomment'>/// will use the context built by previous encode calls.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is the main API for performing HPACK encoding of headers.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Examples</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Encoding a header two times in a row produces two different</span>
<span class='doccomment'>/// representations, due to the utilization of HPACK compression.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// use hpack::Encoder;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// let mut encoder = Encoder::new();</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// let headers = vec![</span>
<span class='doccomment'>///     (b&quot;custom-key&quot;.to_vec(), b&quot;custom-value&quot;.to_vec()),</span>
<span class='doccomment'>/// ];</span>
<span class='doccomment'>/// // First encoding...</span>
<span class='doccomment'>/// let result = encoder.encode(&amp;headers);</span>
<span class='doccomment'>/// // The result is a literal encoding of the header name and value, with an</span>
<span class='doccomment'>/// // initial byte representing the type of the encoding</span>
<span class='doccomment'>/// // (incremental indexing).</span>
<span class='doccomment'>/// assert_eq!(</span>
<span class='doccomment'>///     vec![0x40,</span>
<span class='doccomment'>///          10, b&#39;c&#39;, b&#39;u&#39;, b&#39;s&#39;, b&#39;t&#39;, b&#39;o&#39;, b&#39;m&#39;, b&#39;-&#39;, b&#39;k&#39;, b&#39;e&#39;, b&#39;y&#39;,</span>
<span class='doccomment'>///          12, b&#39;c&#39;, b&#39;u&#39;, b&#39;s&#39;, b&#39;t&#39;, b&#39;o&#39;, b&#39;m&#39;, b&#39;-&#39;, b&#39;v&#39;, b&#39;a&#39;, b&#39;l&#39;,</span>
<span class='doccomment'>///          b&#39;u&#39;, b&#39;e&#39;],</span>
<span class='doccomment'>///     result);</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// // Encode the same headers again!</span>
<span class='doccomment'>/// let result = encoder.encode(&amp;headers);</span>
<span class='doccomment'>/// // The result is simply the index of the header in the header table (62),</span>
<span class='doccomment'>/// // with a flag representing that the decoder should use the index.</span>
<span class='doccomment'>/// assert_eq!(vec![0x80 | 62], result);</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Encoder</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='doccomment'>/// The header table represents the encoder&#39;s context</span>
    <span class='ident'>header_table</span>: <span class='ident'>HeaderTable</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Encoder</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='doccomment'>/// Creates a new `Encoder` with a default static table, as defined by the</span>
    <span class='doccomment'>/// HPACK spec (Appendix A).</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='ident'>Encoder</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
        <span class='ident'>Encoder</span> {
            <span class='ident'>header_table</span>: <span class='ident'>HeaderTable</span>::<span class='ident'>with_static_table</span>(<span class='ident'>STATIC_TABLE</span>),
        }
    }

    <span class='doccomment'>/// Encodes the given headers using the HPACK rules and returns a newly</span>
    <span class='doccomment'>/// allocated `Vec` containing the bytes representing the encoded header</span>
    <span class='doccomment'>/// set.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The encoder so far supports only a single, extremely simple encoding</span>
    <span class='doccomment'>/// strategy, whereby each header is represented as an indexed header if</span>
    <span class='doccomment'>/// already found in the header table and a literal otherwise. When a</span>
    <span class='doccomment'>/// header isn&#39;t found in the table, it is added if the header name wasn&#39;t</span>
    <span class='doccomment'>/// found either (i.e. there are never two header names with different</span>
    <span class='doccomment'>/// values in the produced header table). Strings are always encoded as</span>
    <span class='doccomment'>/// literals (Huffman encoding is not used).</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>headers</span>: <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</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='op'>&gt;</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'>encoded</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='kw'>for</span> <span class='ident'>header</span> <span class='kw'>in</span> <span class='ident'>headers</span>.<span class='ident'>iter</span>() {
            <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>header_table</span>.<span class='ident'>find_header</span>((<span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>0</span>, <span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>1</span>)) {
                <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
                    <span class='comment'>// The name of the header is in no tables: need to encode</span>
                    <span class='comment'>// it with both a literal name and value.</span>
                    <span class='self'>self</span>.<span class='ident'>encode_literal</span>(<span class='ident'>header</span>, <span class='bool-val'>true</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>encoded</span>);
                    <span class='self'>self</span>.<span class='ident'>header_table</span>.<span class='ident'>add_header</span>(<span class='ident'>header</span>.<span class='number'>0</span>.<span class='ident'>clone</span>(), <span class='ident'>header</span>.<span class='number'>1</span>.<span class='ident'>clone</span>());
                },
                <span class='prelude-val'>Some</span>((<span class='ident'>index</span>, <span class='bool-val'>false</span>)) <span class='op'>=&gt;</span> {
                    <span class='comment'>// The name of the header is at the given index, but the</span>
                    <span class='comment'>// value does not match the current one: need to encode</span>
                    <span class='comment'>// only the value as a literal.</span>
                    <span class='self'>self</span>.<span class='ident'>encode_indexed_name</span>((<span class='ident'>index</span>, <span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>1</span>), <span class='bool-val'>false</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>encoded</span>);
                },
                <span class='prelude-val'>Some</span>((<span class='ident'>index</span>, <span class='bool-val'>true</span>)) <span class='op'>=&gt;</span> {
                    <span class='comment'>// The full header was found in one of the tables, so we</span>
                    <span class='comment'>// just encode the index.</span>
                    <span class='self'>self</span>.<span class='ident'>encode_indexed</span>(<span class='ident'>index</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>encoded</span>);
                }
            };
        }

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

    <span class='doccomment'>/// Encodes a header as a literal (i.e. both the name and the value are</span>
    <span class='doccomment'>/// encoded as a string literal) and places the result in the given buffer</span>
    <span class='doccomment'>/// `buf`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Parameters</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// - `header` - the header to be encoded</span>
    <span class='doccomment'>/// - `should_index` - indicates whether the given header should be indexed, i.e.</span>
    <span class='doccomment'>///                    inserted into the dynamic table</span>
    <span class='doccomment'>/// - `buf` - The buffer into which the result is placed</span>
    <span class='doccomment'>///</span>
    <span class='kw'>fn</span> <span class='ident'>encode_literal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
                      <span class='ident'>header</span>: <span class='kw-2'>&amp;</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</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='ident'>should_index</span>: <span class='ident'>bool</span>,
                      <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</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='ident'>mask</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>should_index</span> {
            <span class='number'>0x40</span>
        } <span class='kw'>else</span> {
            <span class='number'>0x0</span>
        };

        <span class='ident'>buf</span>.<span class='ident'>push</span>(<span class='ident'>mask</span>);
        <span class='self'>self</span>.<span class='ident'>encode_string_literal</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>0</span>, <span class='ident'>buf</span>);
        <span class='self'>self</span>.<span class='ident'>encode_string_literal</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>1</span>, <span class='ident'>buf</span>);
    }

    <span class='doccomment'>/// Encodes a string literal and places the result in the given buffer</span>
    <span class='doccomment'>/// `buf`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The function does not consider Huffman encoding for now, but always</span>
    <span class='doccomment'>/// produces a string literal representations, according to the HPACK spec</span>
    <span class='doccomment'>/// section 5.2.</span>
    <span class='kw'>fn</span> <span class='ident'>encode_string_literal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>octet_str</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>], <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>) {
        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>encode_integer</span>(<span class='ident'>octet_str</span>.<span class='ident'>len</span>(), <span class='number'>7</span>).<span class='ident'>into_iter</span>());
        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>octet_str</span>.<span class='ident'>to_vec</span>().<span class='ident'>into_iter</span>());
    }

    <span class='doccomment'>/// Encodes a header whose name is indexed and places the result in the</span>
    <span class='doccomment'>/// given buffer `buf`.</span>
    <span class='kw'>fn</span> <span class='ident'>encode_indexed_name</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>header</span>: (<span class='ident'>usize</span>, <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>), <span class='ident'>should_index</span>: <span class='ident'>bool</span>, <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</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='ident'>mask</span>, <span class='ident'>prefix</span>) <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>should_index</span> {
            (<span class='number'>0x40</span>, <span class='number'>6</span>)
        } <span class='kw'>else</span> {
            (<span class='number'>0x0</span>, <span class='number'>4</span>)
        };

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoded_index</span> <span class='op'>=</span> <span class='ident'>encode_integer</span>(<span class='ident'>header</span>.<span class='number'>0</span>, <span class='ident'>prefix</span>);
        <span class='ident'>encoded_index</span>[<span class='number'>0</span>] <span class='op'>|=</span> <span class='ident'>mask</span>;
        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>encoded_index</span>.<span class='ident'>into_iter</span>());
        <span class='comment'>// So far, we rely on just one strategy for encoding string literals.</span>
        <span class='self'>self</span>.<span class='ident'>encode_string_literal</span>(<span class='kw-2'>&amp;</span><span class='ident'>header</span>.<span class='number'>1</span>, <span class='ident'>buf</span>);
    }

    <span class='doccomment'>/// Encodes an indexed header (a header that is fully in the header table)</span>
    <span class='doccomment'>/// and places the result in the given buffer `buf`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The encoding is according to the rules of the HPACK spec, section 6.1.</span>
    <span class='kw'>fn</span> <span class='ident'>encode_indexed</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>index</span>: <span class='ident'>usize</span>, <span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</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'>encoded</span> <span class='op'>=</span> <span class='ident'>encode_integer</span>(<span class='ident'>index</span>, <span class='number'>7</span>);
        <span class='comment'>// We need to set the most significant bit, since the bit-pattern is</span>
        <span class='comment'>// `1xxxxxxx` for indexed headers.</span>
        <span class='ident'>encoded</span>[<span class='number'>0</span>] <span class='op'>|=</span> <span class='number'>0x80</span>;

        <span class='ident'>buf</span>.<span class='ident'>extend</span>(<span class='ident'>encoded</span>.<span class='ident'>into_iter</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'>encode_integer</span>;
    <span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>Encoder</span>;

    <span class='kw'>use</span> <span class='kw'>super</span>::<span class='kw'>super</span>::<span class='ident'>Decoder</span>;

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_encode_integer</span>() {
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>10</span>, <span class='number'>5</span>), [<span class='number'>10</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>1337</span>, <span class='number'>5</span>), [<span class='number'>31</span>, <span class='number'>154</span>, <span class='number'>10</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>127</span>, <span class='number'>7</span>), [<span class='number'>127</span>, <span class='number'>0</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>255</span>, <span class='number'>8</span>), [<span class='number'>255</span>, <span class='number'>0</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>254</span>, <span class='number'>8</span>), [<span class='number'>254</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>1</span>, <span class='number'>8</span>), [<span class='number'>1</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>0</span>, <span class='number'>8</span>), [<span class='number'>0</span>]);
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encode_integer</span>(<span class='number'>255</span>, <span class='number'>7</span>), [<span class='number'>127</span>, <span class='number'>128</span>, <span class='number'>1</span>]);
    }

    <span class='doccomment'>/// A helper function that checks whether the given buffer can be decoded</span>
    <span class='doccomment'>/// into a set of headers that corresponds to the given `headers` list.</span>
    <span class='doccomment'>/// Relies on using the `hpack::decoder::Decoder`` struct for</span>
    <span class='doccomment'>/// performing the decoding.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Returns</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// A `bool` indicating whether such a decoding can be performed.</span>
    <span class='kw'>fn</span> <span class='ident'>is_decodable</span>(<span class='ident'>buf</span>: <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>, <span class='ident'>headers</span>: <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</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='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>decoder</span> <span class='op'>=</span> <span class='ident'>Decoder</span>::<span class='ident'>new</span>();
        <span class='kw'>match</span> <span class='ident'>decoder</span>.<span class='ident'>decode</span>(<span class='ident'>buf</span>).<span class='ident'>ok</span>() {
            <span class='prelude-val'>Some</span>(<span class='ident'>h</span>) <span class='op'>=&gt;</span> <span class='ident'>h</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>headers</span>,
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='bool-val'>false</span>,
        }
    }

    <span class='doccomment'>/// Tests that encoding only the `:method` header works.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_encode_only_method</span>() {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span>: <span class='ident'>Encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
        <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
            (<span class='string'>b&quot;:method&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;GET&quot;</span>.<span class='ident'>to_vec</span>()),
        ];

        <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

        <span class='macro'>debug</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>result</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>is_decodable</span>(<span class='kw-2'>&amp;</span><span class='ident'>result</span>, <span class='kw-2'>&amp;</span><span class='ident'>headers</span>));
    }

    <span class='doccomment'>/// Tests that when a single custom header is sent it gets indexed by the</span>
    <span class='doccomment'>/// coder.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_custom_header_gets_indexed</span>() {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span>: <span class='ident'>Encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
        <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
            (<span class='string'>b&quot;custom-key&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;custom-value&quot;</span>.<span class='ident'>to_vec</span>()),
        ];

        <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>is_decodable</span>(<span class='kw-2'>&amp;</span><span class='ident'>result</span>, <span class='kw-2'>&amp;</span><span class='ident'>headers</span>));
        <span class='comment'>// The header is in the encoder&#39;s dynamic table.</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encoder</span>.<span class='ident'>header_table</span>.<span class='ident'>dynamic_table</span>.<span class='ident'>to_vec</span>(), <span class='ident'>headers</span>);
        <span class='comment'>// ...but also indicated as such in the output.</span>
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='number'>0x40</span> <span class='op'>==</span> (<span class='number'>0x40</span> <span class='kw-2'>&amp;</span> <span class='ident'>result</span>[<span class='number'>0</span>]));
        <span class='macro'>debug</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>result</span>);
    }

    <span class='doccomment'>/// Tests that when a header gets added to the dynamic table, the encoder</span>
    <span class='doccomment'>/// will use the index, instead of the literal representation on the next</span>
    <span class='doccomment'>/// encoding of the same header.</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_uses_index_on_second_iteration</span>() {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span>: <span class='ident'>Encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
        <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
            (<span class='string'>b&quot;custom-key&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;custom-value&quot;</span>.<span class='ident'>to_vec</span>()),
        ];
        <span class='comment'>// First encoding...</span>
        <span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

        <span class='comment'>// Encode the same headers again!</span>
        <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

        <span class='comment'>// The header is in the encoder&#39;s dynamic table.</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>encoder</span>.<span class='ident'>header_table</span>.<span class='ident'>dynamic_table</span>.<span class='ident'>to_vec</span>(), <span class='ident'>headers</span>);
        <span class='comment'>// The output is a single index byte?</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>result</span>.<span class='ident'>len</span>(), <span class='number'>1</span>);
        <span class='comment'>// The index is correctly encoded:</span>
        <span class='comment'>// - The most significant bit is set</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>0x80</span> <span class='kw-2'>&amp;</span> <span class='ident'>result</span>[<span class='number'>0</span>], <span class='number'>0x80</span>);
        <span class='comment'>// - The other 7 bits decode to an integer giving the index in the full</span>
        <span class='comment'>//   header address space.</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>result</span>[<span class='number'>0</span>] <span class='op'>^</span> <span class='number'>0x80</span>, <span class='number'>62</span>);
        <span class='comment'>// The header table actually contains the header at that index?</span>
        <span class='macro'>assert_eq</span><span class='macro'>!</span>(
            <span class='ident'>encoder</span>.<span class='ident'>header_table</span>.<span class='ident'>get_from_table</span>(<span class='number'>62</span>).<span class='ident'>unwrap</span>(),
            (<span class='kw-2'>&amp;</span><span class='ident'>headers</span>[<span class='number'>0</span>].<span class='number'>0</span>[..], <span class='kw-2'>&amp;</span><span class='ident'>headers</span>[<span class='number'>0</span>].<span class='number'>1</span>[..]));
    }

    <span class='doccomment'>/// Tests that when a header name is indexed, but the value isn&#39;t, the</span>
    <span class='doccomment'>/// header is represented by an index (for the name) and a literal (for</span>
    <span class='doccomment'>/// the value).</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_name_indexed_value_not</span>() {
        {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span>: <span class='ident'>Encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
            <span class='comment'>// `:method` is in the static table, but only for GET and POST</span>
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
                (<span class='string'>b&quot;:method&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;PUT&quot;</span>.<span class='ident'>to_vec</span>()),
            ];

            <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

            <span class='comment'>// The first byte represents the index in the header table: last</span>
            <span class='comment'>// occurrence of `:method` is at index 3.</span>
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>result</span>[<span class='number'>0</span>], <span class='number'>3</span>);
            <span class='comment'>// The rest of it correctly represents PUT?</span>
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&amp;</span><span class='ident'>result</span>[<span class='number'>1</span>..], <span class='kw-2'>&amp;</span>[<span class='number'>3</span>, <span class='string'>b&#39;P&#39;</span>, <span class='string'>b&#39;U&#39;</span>, <span class='string'>b&#39;T&#39;</span>]);
        }
        {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span>: <span class='ident'>Encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
            <span class='comment'>// `:method` is in the static table, but only for GET and POST</span>
            <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
                (<span class='string'>b&quot;:authority&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;example.com&quot;</span>.<span class='ident'>to_vec</span>()),
            ];

            <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>result</span>[<span class='number'>0</span>], <span class='number'>1</span>);
            <span class='comment'>// The rest of it correctly represents PUT?</span>
            <span class='macro'>assert_eq</span><span class='macro'>!</span>(
                <span class='kw-2'>&amp;</span><span class='ident'>result</span>[<span class='number'>1</span>..],
                <span class='kw-2'>&amp;</span>[<span class='number'>11</span>, <span class='string'>b&#39;e&#39;</span>, <span class='string'>b&#39;x&#39;</span>, <span class='string'>b&#39;a&#39;</span>, <span class='string'>b&#39;m&#39;</span>, <span class='string'>b&#39;p&#39;</span>, <span class='string'>b&#39;l&#39;</span>, <span class='string'>b&#39;e&#39;</span>, <span class='string'>b&#39;.&#39;</span>, <span class='string'>b&#39;c&#39;</span>, <span class='string'>b&#39;o&#39;</span>, <span class='string'>b&#39;m&#39;</span>])
        }
    }

    <span class='doccomment'>/// Tests that multiple headers are correctly encoded (i.e. can be decoded</span>
    <span class='doccomment'>/// back to their original representation).</span>
    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_multiple_headers_encoded</span>() {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>encoder</span> <span class='op'>=</span> <span class='ident'>Encoder</span>::<span class='ident'>new</span>();
        <span class='kw'>let</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[
            (<span class='string'>b&quot;custom-key&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;custom-value&quot;</span>.<span class='ident'>to_vec</span>()),
            (<span class='string'>b&quot;:method&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;GET&quot;</span>.<span class='ident'>to_vec</span>()),
            (<span class='string'>b&quot;:path&quot;</span>.<span class='ident'>to_vec</span>(), <span class='string'>b&quot;/some/path&quot;</span>.<span class='ident'>to_vec</span>()),
        ];

        <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>encoder</span>.<span class='ident'>encode</span>(<span class='kw-2'>&amp;</span><span class='ident'>headers</span>);

        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>is_decodable</span>(<span class='kw-2'>&amp;</span><span class='ident'>result</span>, <span class='kw-2'>&amp;</span><span class='ident'>headers</span>));
    }
}
</pre>
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