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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Encode arbitrary octets as base64. Writes into the supplied output buffer."><meta name="keywords" content="rust, rustlang, rust-lang, encode_config_slice"><title>encode_config_slice in base64 - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">base64</a></h2><div id="sidebar-vars" data-name="encode_config_slice" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../base64/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">base64</a>::<wbr><a class="fn" href="#">encode_config_slice</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/base64/encode.rs.html#117-128" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn encode_config_slice&lt;T:&nbsp;<a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.slice.html">]</a>&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;input: T, <br>&nbsp;&nbsp;&nbsp;&nbsp;config: <a class="struct" href="struct.Config.html" title="struct base64::Config">Config</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;output: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.slice.html">&amp;mut [</a><a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.slice.html">]</a><br>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Encode arbitrary octets as base64.
Writes into the supplied output buffer.</p>
<p>This is useful if you wish to avoid allocation entirely (e.g. encoding into a stack-resident
or statically-allocated buffer).</p>
<h2 id="panics" class="section-header"><a href="#panics">Panics</a></h2>
<p>If <code>output</code> is too small to hold the encoded version of <code>input</code>, a panic will result.</p>
<h2 id="example" class="section-header"><a href="#example">Example</a></h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">base64</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">b&quot;hello internet!&quot;</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
<span class="comment">// make sure we&#39;ll have a slice big enough for base64 + padding</span>
<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>);
<span class="kw">let</span> <span class="ident">bytes_written</span> <span class="op">=</span> <span class="ident">base64::encode_config_slice</span>(<span class="ident">s</span>,
<span class="ident">base64::STANDARD</span>, <span class="kw-2">&amp;mut</span> <span class="ident">buf</span>);
<span class="comment">// shorten our vec down to just what was written</span>
<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">bytes_written</span>, <span class="number">0</span>);
<span class="macro">assert_eq!</span>(<span class="ident">s</span>, <span class="ident">base64::decode</span>(<span class="kw-2">&amp;</span><span class="ident">buf</span>).<span class="ident">unwrap</span>().<span class="ident">as_slice</span>());
}</code></pre></div>
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