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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="doccomment">/// Configuration parameter trait</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Parameter</span><span class="op"><</span><span class="ident">Object</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">set_param</span>(<span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Object</span>);
}
<span class="doccomment">/// Object has parameters</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">HasParameters</span>: <span class="ident">Sized</span> {
<span class="kw">fn</span> <span class="ident">set</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Parameter</span><span class="op"><</span><span class="self">Self</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="ident">value</span>.<span class="ident">set_param</span>(<span class="self">self</span>);
<span class="self">self</span>
}
}
<span class="comment">// Will be replaced by stdlib solution</span>
<span class="kw">fn</span> <span class="ident">read_all</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>, <span class="kw-2">mut</span> <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">total</span> <span class="op"><</span> <span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="kw">match</span> <span class="ident">this</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">total</span>..]) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>,
<span class="string">"failed to read the whole buffer"</span>)),
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">total</span> <span class="op">+=</span> <span class="ident">n</span>,
<span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">kind</span>() <span class="op">==</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> {}
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="comment">// Will be replaced by stdlib solution</span>
<span class="kw">fn</span> <span class="ident">write_all</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Write</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">W</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">total</span> <span class="op"><</span> <span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="kw">match</span> <span class="ident">this</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">total</span>..]) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>,
<span class="string">"failed to write the whole buffer"</span>)),
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">total</span> <span class="op">+=</span> <span class="ident">n</span>,
<span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">kind</span>() <span class="op">==</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> {}
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Read extension to read big endian data</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">ReadBytesExt</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">io</span>::<span class="ident">Read</span> {
<span class="doccomment">/// Read `T` from a bytes stream. Most significant byte first.</span>
<span class="kw">fn</span> <span class="ident">read_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
}
<span class="doccomment">/// Write extension to write big endian data</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">WriteBytesExt</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">io</span>::<span class="ident">Write</span> {
<span class="doccomment">/// Writes `T` to a bytes stream. Most significant byte first.</span>
<span class="kw">fn</span> <span class="ident">write_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">T</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>;
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Read</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">ReadBytesExt</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> <span class="ident">W</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">read_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">byte</span> <span class="op">=</span> [<span class="number">0</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_all</span>(<span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">byte</span>));
<span class="prelude-val">Ok</span>(<span class="ident">byte</span>[<span class="number">0</span>])
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Read</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">ReadBytesExt</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span> <span class="kw">for</span> <span class="ident">W</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">read_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_all</span>(<span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bytes</span>));
<span class="prelude-val">Ok</span>((<span class="ident">bytes</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">u16</span>) <span class="op"><<</span> <span class="number">8</span> <span class="op">|</span> <span class="ident">bytes</span>[<span class="number">1</span>] <span class="kw">as</span> <span class="ident">u16</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Read</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">ReadBytesExt</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">W</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">read_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_all</span>(<span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bytes</span>));
<span class="prelude-val">Ok</span>( (<span class="ident">bytes</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><<</span> <span class="number">24</span>
<span class="op">|</span> (<span class="ident">bytes</span>[<span class="number">1</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><<</span> <span class="number">16</span>
<span class="op">|</span> (<span class="ident">bytes</span>[<span class="number">2</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><<</span> <span class="number">8</span>
<span class="op">|</span> <span class="ident">bytes</span>[<span class="number">3</span>] <span class="kw">as</span> <span class="ident">u32</span>
)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Write</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">WriteBytesExt</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">W</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">write_be</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="ident">write_all</span>(<span class="self">self</span>, <span class="kw-2">&</span>[
(<span class="ident">n</span> <span class="op">>></span> <span class="number">24</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="ident">n</span> <span class="op">>></span> <span class="number">16</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="ident">n</span> <span class="op">>></span> <span class="number">8</span>) <span class="kw">as</span> <span class="ident">u8</span>,
<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u8</span>
])
}
}</pre>
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