| <!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/bytes-1.4.0/src/buf/limit.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>limit.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="../../../bytes/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="../../../bytes/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="kw">use </span><span class="kw">crate</span>::buf::UninitSlice; |
| <span class="kw">use </span><span class="kw">crate</span>::BufMut; |
| |
| <span class="kw">use </span>core::cmp; |
| |
| <span class="doccomment">/// A `BufMut` adapter which limits the amount of bytes that can be written |
| /// to an underlying buffer. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Limit<T> { |
| inner: T, |
| limit: usize, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new<T>(inner: T, limit: usize) -> Limit<T> { |
| Limit { inner, limit } |
| } |
| |
| <span class="kw">impl</span><T> Limit<T> { |
| <span class="doccomment">/// Consumes this `Limit`, returning the underlying value. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Gets a reference to the underlying `BufMut`. |
| /// |
| /// It is inadvisable to directly write to the underlying `BufMut`. |
| </span><span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Gets a mutable reference to the underlying `BufMut`. |
| /// |
| /// It is inadvisable to directly write to the underlying `BufMut`. |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Returns the maximum number of bytes that can be written |
| /// |
| /// # Note |
| /// |
| /// If the inner `BufMut` has fewer bytes than indicated by this method then |
| /// that is the actual number of available bytes. |
| </span><span class="kw">pub fn </span>limit(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.limit |
| } |
| |
| <span class="doccomment">/// Sets the maximum number of bytes that can be written. |
| /// |
| /// # Note |
| /// |
| /// If the inner `BufMut` has fewer bytes than `lim` then that is the actual |
| /// number of available bytes. |
| </span><span class="kw">pub fn </span>set_limit(<span class="kw-2">&mut </span><span class="self">self</span>, lim: usize) { |
| <span class="self">self</span>.limit = lim |
| } |
| } |
| |
| <span class="kw">unsafe impl</span><T: BufMut> BufMut <span class="kw">for </span>Limit<T> { |
| <span class="kw">fn </span>remaining_mut(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| cmp::min(<span class="self">self</span>.inner.remaining_mut(), <span class="self">self</span>.limit) |
| } |
| |
| <span class="kw">fn </span>chunk_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>UninitSlice { |
| <span class="kw">let </span>bytes = <span class="self">self</span>.inner.chunk_mut(); |
| <span class="kw">let </span>end = cmp::min(bytes.len(), <span class="self">self</span>.limit); |
| <span class="kw-2">&mut </span>bytes[..end] |
| } |
| |
| <span class="kw">unsafe fn </span>advance_mut(<span class="kw-2">&mut </span><span class="self">self</span>, cnt: usize) { |
| <span class="macro">assert!</span>(cnt <= <span class="self">self</span>.limit); |
| <span class="self">self</span>.inner.advance_mut(cnt); |
| <span class="self">self</span>.limit -= cnt; |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="bytes" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
