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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
| <span id="2"> 2</span> |
| <span id="3"> 3</span> |
| <span id="4"> 4</span> |
| <span id="5"> 5</span> |
| <span id="6"> 6</span> |
| <span id="7"> 7</span> |
| <span id="8"> 8</span> |
| <span id="9"> 9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
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| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| </pre><pre class="rust "> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; |
| |
| <span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Future</span>, <span class="ident">Poll</span>}; |
| |
| <span class="kw">enum</span> <span class="ident">State</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span> { |
| <span class="ident">Pending</span> { |
| <span class="ident">rd</span>: <span class="ident">R</span>, |
| <span class="ident">buf</span>: <span class="ident">T</span>, |
| }, |
| <span class="ident">Empty</span>, |
| } |
| |
| <span class="doccomment">/// Tries to read some bytes directly into the given `buf` in asynchronous</span> |
| <span class="doccomment">/// manner, returning a future type.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The returned future will resolve to both the I/O stream and the buffer</span> |
| <span class="doccomment">/// as well as the number of bytes read once the read operation is completed.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span>(<span class="ident">rd</span>: <span class="ident">R</span>, <span class="ident">buf</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Read</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>, |
| <span class="ident">T</span>: <span class="ident">AsMut</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> |
| { |
| <span class="ident">Read</span> { <span class="ident">state</span>: <span class="ident">State</span>::<span class="ident">Pending</span> { <span class="ident">rd</span>: <span class="ident">rd</span>, <span class="ident">buf</span>: <span class="ident">buf</span> } } |
| } |
| |
| <span class="doccomment">/// A future which can be used to easily read available number of bytes to fill</span> |
| <span class="doccomment">/// a buffer.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Created by the [`read`] function.</span> |
| <span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"futures do nothing unless polled"</span>]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Read</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span> { |
| <span class="ident">state</span>: <span class="ident">State</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">Read</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>, |
| <span class="ident">T</span>: <span class="ident">AsMut</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> |
| { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">R</span>, <span class="ident">T</span>, <span class="ident">usize</span>); |
| <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span>; |
| |
| <span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span>(<span class="ident">R</span>, <span class="ident">T</span>, <span class="ident">usize</span>), ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">state</span> { |
| <span class="ident">State</span>::<span class="ident">Pending</span> { <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">rd</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">buf</span> } <span class="op">=></span> <span class="macro">try_nb</span><span class="macro">!</span>(<span class="ident">rd</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>.<span class="ident">as_mut</span>()[..])), |
| <span class="ident">State</span>::<span class="ident">Empty</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"poll a Read after it's done"</span>), |
| }; |
| |
| <span class="kw">match</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">state</span>, <span class="ident">State</span>::<span class="ident">Empty</span>) { |
| <span class="ident">State</span>::<span class="ident">Pending</span> { <span class="ident">rd</span>, <span class="ident">buf</span> } <span class="op">=></span> <span class="prelude-val">Ok</span>((<span class="ident">rd</span>, <span class="ident">buf</span>, <span class="ident">nread</span>).<span class="ident">into</span>()), |
| <span class="ident">State</span>::<span class="ident">Empty</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid internal state"</span>), |
| } |
| } |
| } |
| </pre> |
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