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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> |
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| <span id="65">65</span> |
| </pre><pre class="rust "> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Read</span>}; |
| <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">Poll</span>, <span class="ident">Future</span>}; |
| |
| <span class="doccomment">/// A future which can be used to easily read the entire contents of a stream</span> |
| <span class="doccomment">/// into a vector.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Created by the [`read_to_end`] function.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`read_to_end`]: fn.read_to_end.html</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">ReadToEnd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { |
| <span class="ident">state</span>: <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, |
| } |
| |
| <span class="kw">enum</span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { |
| <span class="ident">Reading</span> { |
| <span class="ident">a</span>: <span class="ident">A</span>, |
| <span class="ident">buf</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| }, |
| <span class="ident">Empty</span>, |
| } |
| |
| <span class="doccomment">/// Creates a future which will read all the bytes associated with the I/O</span> |
| <span class="doccomment">/// object `A` into the buffer provided.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// In the case of an error the buffer and the object will be discarded, with</span> |
| <span class="doccomment">/// the error yielded. In the case of success the object will be destroyed and</span> |
| <span class="doccomment">/// the buffer will be returned, with all data read from the stream appended to</span> |
| <span class="doccomment">/// the buffer.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_to_end</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">A</span>, <span class="ident">buf</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">ReadToEnd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Read</span>, |
| { |
| <span class="ident">ReadToEnd</span> { |
| <span class="ident">state</span>: <span class="ident">State</span>::<span class="ident">Reading</span> { |
| <span class="ident">a</span>: <span class="ident">a</span>, |
| <span class="ident">buf</span>: <span class="ident">buf</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">ReadToEnd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Read</span>, |
| { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">A</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>); |
| <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</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">A</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>), <span class="ident">io</span>::<span class="ident">Error</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">Reading</span> { <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">a</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">buf</span> } <span class="op">=></span> { |
| <span class="comment">// If we get `Ok`, then we know the stream hit EOF and we're done. If we</span> |
| <span class="comment">// hit "would block" then all the read data so far is in our buffer, and</span> |
| <span class="comment">// otherwise we propagate errors</span> |
| <span class="macro">try_nb</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">read_to_end</span>(<span class="ident">buf</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 ReadToEnd 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">Reading</span> { <span class="ident">a</span>, <span class="ident">buf</span> } <span class="op">=></span> <span class="prelude-val">Ok</span>((<span class="ident">a</span>, <span class="ident">buf</span>).<span class="ident">into</span>()), |
| <span class="ident">State</span>::<span class="ident">Empty</span> <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(), |
| } |
| } |
| } |
| </pre> |
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