| <!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/snap-0.2.5/src/varint.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>varint.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="../../snap/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="../../snap/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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| </pre><pre class="rust"><code><span class="doccomment">/// https://developers.google.com/protocol-buffers/docs/encoding#varints |
| </span><span class="kw">pub fn </span>write_varu64(data: <span class="kw-2">&mut </span>[u8], <span class="kw-2">mut </span>n: u64) -> usize { |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">while </span>n >= <span class="number">0b1000_0000 </span>{ |
| data[i] = (n <span class="kw">as </span>u8) | <span class="number">0b1000_0000</span>; |
| n >>= <span class="number">7</span>; |
| i += <span class="number">1</span>; |
| } |
| data[i] = n <span class="kw">as </span>u8; |
| i + <span class="number">1 |
| </span>} |
| |
| <span class="doccomment">/// https://developers.google.com/protocol-buffers/docs/encoding#varints |
| </span><span class="kw">pub fn </span>read_varu64(data: <span class="kw-2">&</span>[u8]) -> (u64, usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>n: u64 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>shift: u32 = <span class="number">0</span>; |
| <span class="kw">for </span>(i, <span class="kw-2">&</span>b) <span class="kw">in </span>data.iter().enumerate() { |
| <span class="kw">if </span>b < <span class="number">0b1000_0000 </span>{ |
| <span class="kw">return match </span>(b <span class="kw">as </span>u64).checked_shl(shift) { |
| <span class="prelude-val">None </span>=> (<span class="number">0</span>, <span class="number">0</span>), |
| <span class="prelude-val">Some</span>(b) => (n | b, i + <span class="number">1</span>), |
| }; |
| } |
| <span class="kw">match </span>((b <span class="kw">as </span>u64) & <span class="number">0b0111_1111</span>).checked_shl(shift) { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span>(<span class="number">0</span>, <span class="number">0</span>), |
| <span class="prelude-val">Some</span>(b) => n |= b, |
| } |
| shift += <span class="number">7</span>; |
| } |
| (<span class="number">0</span>, <span class="number">0</span>) |
| } |
| </code></pre></div> |
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