151 lines
8.2 KiB
HTML
151 lines
8.2 KiB
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<p class='location'><a href='index.html'>base64</a></p><script>window.sidebarCurrent = {name: 'encode_config_slice', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>base64</a>::<wbr><a class="fn" href=''>encode_config_slice</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/base64/encode.rs.html#123-138' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn encode_config_slice<T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>>(<br> input: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T, <br> config: <a class="struct" href="../base64/struct.Config.html" title="struct base64::Config">Config</a>, <br> output: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a><br>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></pre><div class='docblock'><p>Encode arbitrary octets as base64.
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Writes into the supplied output buffer.</p>
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<p>This is useful if you wish to avoid allocation entirely (e.g. encoding into a stack-resident
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or statically-allocated buffer).</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>If <code>output</code> is too small to hold the encoded version of <code>input</code>, a panic will result.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">base64</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">b"hello internet!"</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
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<span class="comment">// make sure we'll have a slice big enough for base64 + padding</span>
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<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="number">4</span> <span class="op">/</span> <span class="number">3</span> <span class="op">+</span> <span class="number">4</span>, <span class="number">0</span>);
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<span class="kw">let</span> <span class="ident">bytes_written</span> <span class="op">=</span> <span class="ident">base64</span>::<span class="ident">encode_config_slice</span>(<span class="ident">s</span>,
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<span class="ident">base64</span>::<span class="ident">STANDARD</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
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<span class="comment">// shorten our vec down to just what was written</span>
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<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">bytes_written</span>, <span class="number">0</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="ident">base64</span>::<span class="ident">decode</span>(<span class="kw-2">&</span><span class="ident">buf</span>).<span class="ident">unwrap</span>().<span class="ident">as_slice</span>());
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}</pre>
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