| <!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/hyper-0.14.26/src/common/buf.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>buf.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="../../../hyper/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="../../../hyper/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>std::collections::VecDeque; |
| <span class="kw">use </span>std::io::IoSlice; |
| |
| <span class="kw">use </span>bytes::{Buf, BufMut, Bytes, BytesMut}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>BufList<T> { |
| bufs: VecDeque<T>, |
| } |
| |
| <span class="kw">impl</span><T: Buf> BufList<T> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -> BufList<T> { |
| BufList { |
| bufs: VecDeque::new(), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, buf: T) { |
| <span class="macro">debug_assert!</span>(buf.has_remaining()); |
| <span class="self">self</span>.bufs.push_back(buf); |
| } |
| |
| <span class="attribute">#[inline] |
| #[cfg(feature = <span class="string">"http1"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>bufs_cnt(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.bufs.len() |
| } |
| } |
| |
| <span class="kw">impl</span><T: Buf> Buf <span class="kw">for </span>BufList<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>remaining(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.bufs.iter().map(|buf| buf.remaining()).sum() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>chunk(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.bufs.front().map(Buf::chunk).unwrap_or_default() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>advance(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>cnt: usize) { |
| <span class="kw">while </span>cnt > <span class="number">0 </span>{ |
| { |
| <span class="kw">let </span>front = <span class="kw-2">&mut </span><span class="self">self</span>.bufs[<span class="number">0</span>]; |
| <span class="kw">let </span>rem = front.remaining(); |
| <span class="kw">if </span>rem > cnt { |
| front.advance(cnt); |
| <span class="kw">return</span>; |
| } <span class="kw">else </span>{ |
| front.advance(rem); |
| cnt -= rem; |
| } |
| } |
| <span class="self">self</span>.bufs.pop_front(); |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>chunks_vectored<<span class="lifetime">'t</span>>(<span class="kw-2">&</span><span class="lifetime">'t </span><span class="self">self</span>, dst: <span class="kw-2">&mut </span>[IoSlice<<span class="lifetime">'t</span>>]) -> usize { |
| <span class="kw">if </span>dst.is_empty() { |
| <span class="kw">return </span><span class="number">0</span>; |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>vecs = <span class="number">0</span>; |
| <span class="kw">for </span>buf <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.bufs { |
| vecs += buf.chunks_vectored(<span class="kw-2">&mut </span>dst[vecs..]); |
| <span class="kw">if </span>vecs == dst.len() { |
| <span class="kw">break</span>; |
| } |
| } |
| vecs |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>copy_to_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> Bytes { |
| <span class="comment">// Our inner buffer may have an optimized version of copy_to_bytes, and if the whole |
| // request can be fulfilled by the front buffer, we can take advantage. |
| </span><span class="kw">match </span><span class="self">self</span>.bufs.front_mut() { |
| <span class="prelude-val">Some</span>(front) <span class="kw">if </span>front.remaining() == len => { |
| <span class="kw">let </span>b = front.copy_to_bytes(len); |
| <span class="self">self</span>.bufs.pop_front(); |
| b |
| } |
| <span class="prelude-val">Some</span>(front) <span class="kw">if </span>front.remaining() > len => front.copy_to_bytes(len), |
| <span class="kw">_ </span>=> { |
| <span class="macro">assert!</span>(len <= <span class="self">self</span>.remaining(), <span class="string">"`len` greater than remaining"</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>bm = BytesMut::with_capacity(len); |
| bm.put(<span class="self">self</span>.take(len)); |
| bm.freeze() |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>std::ptr; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn </span>hello_world_buf() -> BufList<Bytes> { |
| BufList { |
| bufs: <span class="macro">vec!</span>[Bytes::from(<span class="string">"Hello"</span>), Bytes::from(<span class="string">" "</span>), Bytes::from(<span class="string">"World"</span>)].into(), |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>to_bytes_shorter() { |
| <span class="kw">let </span><span class="kw-2">mut </span>bufs = hello_world_buf(); |
| <span class="kw">let </span>old_ptr = bufs.chunk().as_ptr(); |
| <span class="kw">let </span>start = bufs.copy_to_bytes(<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(start, <span class="string">"Hell"</span>); |
| <span class="macro">assert!</span>(ptr::eq(old_ptr, start.as_ptr())); |
| <span class="macro">assert_eq!</span>(bufs.chunk(), <span class="string">b"o"</span>); |
| <span class="macro">assert!</span>(ptr::eq(old_ptr.wrapping_add(<span class="number">4</span>), bufs.chunk().as_ptr())); |
| <span class="macro">assert_eq!</span>(bufs.remaining(), <span class="number">7</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>to_bytes_eq() { |
| <span class="kw">let </span><span class="kw-2">mut </span>bufs = hello_world_buf(); |
| <span class="kw">let </span>old_ptr = bufs.chunk().as_ptr(); |
| <span class="kw">let </span>start = bufs.copy_to_bytes(<span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(start, <span class="string">"Hello"</span>); |
| <span class="macro">assert!</span>(ptr::eq(old_ptr, start.as_ptr())); |
| <span class="macro">assert_eq!</span>(bufs.chunk(), <span class="string">b" "</span>); |
| <span class="macro">assert_eq!</span>(bufs.remaining(), <span class="number">6</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>to_bytes_longer() { |
| <span class="kw">let </span><span class="kw-2">mut </span>bufs = hello_world_buf(); |
| <span class="kw">let </span>start = bufs.copy_to_bytes(<span class="number">7</span>); |
| <span class="macro">assert_eq!</span>(start, <span class="string">"Hello W"</span>); |
| <span class="macro">assert_eq!</span>(bufs.remaining(), <span class="number">4</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>one_long_buf_to_bytes() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = BufList::new(); |
| buf.push(<span class="string">b"Hello World" </span><span class="kw">as </span><span class="kw-2">&</span>[<span class="kw">_</span>]); |
| <span class="macro">assert_eq!</span>(buf.copy_to_bytes(<span class="number">5</span>), <span class="string">"Hello"</span>); |
| <span class="macro">assert_eq!</span>(buf.chunk(), <span class="string">b" World"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"`len` greater than remaining"</span>)] |
| </span><span class="kw">fn </span>buf_to_bytes_too_many() { |
| hello_world_buf().copy_to_bytes(<span class="number">42</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="hyper" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
