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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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/ring-0.16.20/src/io/writer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>writer.rs - source</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" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../ring/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../ring/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="comment">// Copyright 2018 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
</span><span class="kw">use </span>alloc::{boxed::Box, vec::Vec};
<span class="kw">pub trait </span>Accumulator {
<span class="kw">fn </span>write_byte(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u8);
<span class="kw">fn </span>write_bytes(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>[u8]);
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>LengthMeasurement {
len: usize,
}
<span class="kw">impl </span>Into&lt;usize&gt; <span class="kw">for </span>LengthMeasurement {
<span class="kw">fn </span>into(<span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.len
}
}
<span class="kw">impl </span>LengthMeasurement {
<span class="kw">pub fn </span>zero() -&gt; <span class="self">Self </span>{
<span class="self">Self </span>{ len: <span class="number">0 </span>}
}
}
<span class="kw">impl </span>Accumulator <span class="kw">for </span>LengthMeasurement {
<span class="kw">fn </span>write_byte(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _value: u8) {
<span class="self">self</span>.len += <span class="number">1</span>;
}
<span class="kw">fn </span>write_bytes(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>[u8]) {
<span class="self">self</span>.len += value.len();
}
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Writer {
bytes: Vec&lt;u8&gt;,
requested_capacity: usize,
}
<span class="kw">impl </span>Writer {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>with_capacity(capacity: LengthMeasurement) -&gt; <span class="self">Self </span>{
<span class="self">Self </span>{
bytes: Vec::with_capacity(capacity.len),
requested_capacity: capacity.len,
}
}
}
<span class="kw">impl </span>Into&lt;Box&lt;[u8]&gt;&gt; <span class="kw">for </span>Writer {
<span class="kw">fn </span>into(<span class="self">self</span>) -&gt; Box&lt;[u8]&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.requested_capacity, <span class="self">self</span>.bytes.len());
<span class="self">self</span>.bytes.into_boxed_slice()
}
}
<span class="kw">impl </span>Accumulator <span class="kw">for </span>Writer {
<span class="kw">fn </span>write_byte(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: u8) {
<span class="self">self</span>.bytes.push(value);
}
<span class="kw">fn </span>write_bytes(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>[u8]) {
<span class="self">self</span>.bytes.extend(value);
}
}
<span class="kw">pub fn </span>write_copy(accumulator: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>Accumulator, to_copy: untrusted::Input) {
accumulator.write_bytes(to_copy.as_slice_less_safe())
}
</code></pre></div>
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