| <!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/sunhe/incubator-teaclave/third_party/rust-sgx-sdk/sgx_rand/src/read.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>read.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="../../sgx_rand/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="../../sgx_rand/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">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| </span><span class="doccomment">//! A wrapper around any Read to treat it as an RNG. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::Rng; |
| <span class="kw">use </span>std::io::{<span class="self">self</span>, Read}; |
| <span class="kw">use </span>std::mem; |
| |
| <span class="doccomment">/// An RNG that reads random bytes straight from a `Read`. This will |
| /// work best with an infinite reader, but this is not required. |
| /// |
| /// # Panics |
| /// |
| /// It will panic if it there is insufficient data to fulfill a request. |
| /// |
| /// # Example |
| /// |
| /// ```rust |
| /// use sgx_rand::{read, Rng}; |
| /// |
| /// let data = vec![1, 2, 3, 4, 5, 6, 7, 8]; |
| /// let mut rng = read::ReadRng::new(&data[..]); |
| /// println!("{:x}", rng.gen::<u32>()); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ReadRng<R> { |
| reader: R, |
| } |
| |
| <span class="kw">impl</span><R: Read> ReadRng<R> { |
| <span class="doccomment">/// Create a new `ReadRng` from a `Read`. |
| </span><span class="kw">pub fn </span>new(r: R) -> ReadRng<R> { |
| ReadRng { reader: r } |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read> Rng <span class="kw">for </span>ReadRng<R> { |
| <span class="kw">fn </span>next_u32(<span class="kw-2">&mut </span><span class="self">self</span>) -> u32 { |
| <span class="comment">// This is designed for speed: reading a LE integer on a LE |
| // platform just involves blitting the bytes into the memory |
| // of the u32, similarly for BE on BE; avoiding byteswapping. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">4</span>]; |
| fill(<span class="kw-2">&mut </span><span class="self">self</span>.reader, <span class="kw-2">&mut </span>buf).unwrap(); |
| <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(buf.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>u32) } |
| } |
| <span class="kw">fn </span>next_u64(<span class="kw-2">&mut </span><span class="self">self</span>) -> u64 { |
| <span class="comment">// see above for explanation. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">8</span>]; |
| fill(<span class="kw-2">&mut </span><span class="self">self</span>.reader, <span class="kw-2">&mut </span>buf).unwrap(); |
| <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(buf.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>u64) } |
| } |
| <span class="kw">fn </span>fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, v: <span class="kw-2">&mut </span>[u8]) { |
| <span class="kw">if </span>v.is_empty() { |
| <span class="kw">return</span>; |
| } |
| fill(<span class="kw-2">&mut </span><span class="self">self</span>.reader, v).unwrap(); |
| } |
| } |
| |
| <span class="attribute">#[allow(clippy::mem_replace_with_default)] |
| </span><span class="kw">fn </span>fill(r: <span class="kw-2">&mut </span><span class="kw">dyn </span>Read, <span class="kw-2">mut </span>buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<()> { |
| <span class="kw">while </span>!buf.is_empty() { |
| <span class="kw">match </span>(r.read(buf))<span class="question-mark">? </span>{ |
| <span class="number">0 </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::new(io::ErrorKind::Other, <span class="string">"end of file reached"</span>)), |
| n => buf = <span class="kw-2">&mut </span>mem::replace(<span class="kw-2">&mut </span>buf, <span class="kw-2">&mut </span>[])[n..], |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="sgx_rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |