| <!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/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/rand/rand_core/src/le.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>le.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="icon" href="https://www.rust-lang.org/favicon.ico"></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="../../rand_core/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! Little-Endian utilities |
| //! |
| //! Little-Endian order has been chosen for internal usage; this makes some |
| //! useful functions available. |
| |
| </span><span class="kw">use </span>core::convert::TryInto; |
| |
| <span class="doccomment">/// Reads unsigned 32 bit integers from `src` into `dst`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>read_u32_into(src: <span class="kw-2">&</span>[u8], dst: <span class="kw-2">&mut </span>[u32]) { |
| <span class="macro">assert!</span>(src.len() >= <span class="number">4 </span>* dst.len()); |
| <span class="kw">for </span>(out, chunk) <span class="kw">in </span>dst.iter_mut().zip(src.chunks_exact(<span class="number">4</span>)) { |
| <span class="kw-2">*</span>out = u32::from_le_bytes(chunk.try_into().unwrap()); |
| } |
| } |
| |
| <span class="doccomment">/// Reads unsigned 64 bit integers from `src` into `dst`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>read_u64_into(src: <span class="kw-2">&</span>[u8], dst: <span class="kw-2">&mut </span>[u64]) { |
| <span class="macro">assert!</span>(src.len() >= <span class="number">8 </span>* dst.len()); |
| <span class="kw">for </span>(out, chunk) <span class="kw">in </span>dst.iter_mut().zip(src.chunks_exact(<span class="number">8</span>)) { |
| <span class="kw-2">*</span>out = u64::from_le_bytes(chunk.try_into().unwrap()); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_read() { |
| <span class="kw">let </span>bytes = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">15</span>, <span class="number">16</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u32</span>; <span class="number">4</span>]; |
| read_u32_into(<span class="kw-2">&</span>bytes, <span class="kw-2">&mut </span>buf); |
| <span class="macro">assert_eq!</span>(buf[<span class="number">0</span>], <span class="number">0x04030201</span>); |
| <span class="macro">assert_eq!</span>(buf[<span class="number">3</span>], <span class="number">0x100F0E0D</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u32</span>; <span class="number">3</span>]; |
| read_u32_into(<span class="kw-2">&</span>bytes[<span class="number">1</span>..<span class="number">13</span>], <span class="kw-2">&mut </span>buf); <span class="comment">// unaligned |
| </span><span class="macro">assert_eq!</span>(buf[<span class="number">0</span>], <span class="number">0x05040302</span>); |
| <span class="macro">assert_eq!</span>(buf[<span class="number">2</span>], <span class="number">0x0D0C0B0A</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u64</span>; <span class="number">2</span>]; |
| read_u64_into(<span class="kw-2">&</span>bytes, <span class="kw-2">&mut </span>buf); |
| <span class="macro">assert_eq!</span>(buf[<span class="number">0</span>], <span class="number">0x0807060504030201</span>); |
| <span class="macro">assert_eq!</span>(buf[<span class="number">1</span>], <span class="number">0x100F0E0D0C0B0A09</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u64</span>; <span class="number">1</span>]; |
| read_u64_into(<span class="kw-2">&</span>bytes[<span class="number">7</span>..<span class="number">15</span>], <span class="kw-2">&mut </span>buf); <span class="comment">// unaligned |
| </span><span class="macro">assert_eq!</span>(buf[<span class="number">0</span>], <span class="number">0x0F0E0D0C0B0A0908</span>); |
| } |
| </code></pre></div> |
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