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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| </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="ident">Write</span>}; |
| |
| <span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Future</span>, <span class="ident">Poll</span>}; |
| |
| <span class="doccomment">/// A future which will copy all data from a reader into a writer.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Created by the [`copy`] function, this future will resolve to the number of</span> |
| <span class="doccomment">/// bytes copied or an error if one happens.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`copy`]: fn.copy.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">Copy</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">W</span><span class="op">></span> { |
| <span class="ident">reader</span>: <span class="ident">R</span>, |
| <span class="ident">read_done</span>: <span class="ident">bool</span>, |
| <span class="ident">writer</span>: <span class="ident">W</span>, |
| <span class="ident">pos</span>: <span class="ident">usize</span>, |
| <span class="ident">cap</span>: <span class="ident">usize</span>, |
| <span class="ident">amt</span>: <span class="ident">u64</span>, |
| <span class="ident">buf</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span>, |
| } |
| |
| <span class="doccomment">/// Creates a future which represents copying all the bytes from one object to</span> |
| <span class="doccomment">/// another.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The returned future will copy all the bytes read from `reader` into the</span> |
| <span class="doccomment">/// `writer` specified. This future will only complete once the `reader` has hit</span> |
| <span class="doccomment">/// EOF and all bytes have been written to and flushed from the `writer`</span> |
| <span class="doccomment">/// provided.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// On success the number of bytes is returned and the `reader` and `writer` are</span> |
| <span class="doccomment">/// consumed. On error the error is returned and the I/O objects are consumed as</span> |
| <span class="doccomment">/// well.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copy</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">W</span><span class="op">></span>(<span class="ident">reader</span>: <span class="ident">R</span>, <span class="ident">writer</span>: <span class="ident">W</span>) <span class="op">-></span> <span class="ident">Copy</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">W</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">Read</span>, |
| <span class="ident">W</span>: <span class="ident">Write</span>, |
| { |
| <span class="ident">Copy</span> { |
| <span class="ident">reader</span>: <span class="ident">reader</span>, |
| <span class="ident">read_done</span>: <span class="bool-val">false</span>, |
| <span class="ident">writer</span>: <span class="ident">writer</span>, |
| <span class="ident">amt</span>: <span class="number">0</span>, |
| <span class="ident">pos</span>: <span class="number">0</span>, |
| <span class="ident">cap</span>: <span class="number">0</span>, |
| <span class="ident">buf</span>: <span class="ident">Box</span>::<span class="ident">new</span>([<span class="number">0</span>; <span class="number">2048</span>]), |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">W</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">Copy</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">W</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">Read</span>, |
| <span class="ident">W</span>: <span class="ident">Write</span>, |
| { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">u64</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">u64</span>, <span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">loop</span> { |
| <span class="comment">// If our buffer is empty, then we need to read some data to</span> |
| <span class="comment">// continue.</span> |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">cap</span> <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">read_done</span> { |
| <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="macro">try_nb</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">buf</span>)); |
| <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> { |
| <span class="self">self</span>.<span class="ident">read_done</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="self">self</span>.<span class="ident">cap</span> <span class="op">=</span> <span class="ident">n</span>; |
| } |
| } |
| |
| <span class="comment">// If our buffer has some data, let's write it out!</span> |
| <span class="kw">while</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span> { |
| <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="macro">try_nb</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>[<span class="self">self</span>.<span class="ident">pos</span>..<span class="self">self</span>.<span class="ident">cap</span>])); |
| <span class="self">self</span>.<span class="ident">pos</span> <span class="op">+=</span> <span class="ident">i</span>; |
| <span class="self">self</span>.<span class="ident">amt</span> <span class="op">+=</span> <span class="ident">i</span> <span class="kw">as</span> <span class="ident">u64</span>; |
| } |
| |
| <span class="comment">// If we've written all the data and we've seen EOF, flush out the</span> |
| <span class="comment">// data and finish the transfer.</span> |
| <span class="comment">// done with the entire transfer.</span> |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">cap</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">read_done</span> { |
| <span class="macro">try_nb</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>.<span class="ident">flush</span>()); |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">amt</span>.<span class="ident">into</span>()) |
| } |
| } |
| } |
| } |
| </pre> |
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