| <!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/chain.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>chain.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::{IntoIter, UninitSlice}; |
| <span class="kw">use crate</span>::{Buf, BufMut, Bytes}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">use </span>std::io::IoSlice; |
| |
| <span class="doccomment">/// A `Chain` sequences two buffers. |
| /// |
| /// `Chain` is an adapter that links two underlying buffers and provides a |
| /// continuous view across both buffers. It is able to sequence either immutable |
| /// buffers ([`Buf`] values) or mutable buffers ([`BufMut`] values). |
| /// |
| /// This struct is generally created by calling [`Buf::chain`]. Please see that |
| /// function's documentation for more detail. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::{Bytes, Buf}; |
| /// |
| /// let mut buf = (&b"hello "[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// let full: Bytes = buf.copy_to_bytes(11); |
| /// assert_eq!(full[..], b"hello world"[..]); |
| /// ``` |
| /// |
| /// [`Buf::chain`]: trait.Buf.html#method.chain |
| /// [`Buf`]: trait.Buf.html |
| /// [`BufMut`]: trait.BufMut.html |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Chain<T, U> { |
| a: T, |
| b: U, |
| } |
| |
| <span class="kw">impl</span><T, U> Chain<T, U> { |
| <span class="doccomment">/// Creates a new `Chain` sequencing the provided values. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(a: T, b: U) -> Chain<T, U> { |
| Chain { a, b } |
| } |
| |
| <span class="doccomment">/// Gets a reference to the first underlying `Buf`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::Buf; |
| /// |
| /// let buf = (&b"hello"[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// assert_eq!(buf.first_ref()[..], b"hello"[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>first_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>.a |
| } |
| |
| <span class="doccomment">/// Gets a mutable reference to the first underlying `Buf`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::Buf; |
| /// |
| /// let mut buf = (&b"hello"[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// buf.first_mut().advance(1); |
| /// |
| /// let full = buf.copy_to_bytes(9); |
| /// assert_eq!(full, b"elloworld"[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>first_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>.a |
| } |
| |
| <span class="doccomment">/// Gets a reference to the last underlying `Buf`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::Buf; |
| /// |
| /// let buf = (&b"hello"[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// assert_eq!(buf.last_ref()[..], b"world"[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>last_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>U { |
| <span class="kw-2">&</span><span class="self">self</span>.b |
| } |
| |
| <span class="doccomment">/// Gets a mutable reference to the last underlying `Buf`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::Buf; |
| /// |
| /// let mut buf = (&b"hello "[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// buf.last_mut().advance(1); |
| /// |
| /// let full = buf.copy_to_bytes(10); |
| /// assert_eq!(full, b"hello orld"[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>last_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>U { |
| <span class="kw-2">&mut </span><span class="self">self</span>.b |
| } |
| |
| <span class="doccomment">/// Consumes this `Chain`, returning the underlying values. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use bytes::Buf; |
| /// |
| /// let chain = (&b"hello"[..]) |
| /// .chain(&b"world"[..]); |
| /// |
| /// let (first, last) = chain.into_inner(); |
| /// assert_eq!(first[..], b"hello"[..]); |
| /// assert_eq!(last[..], b"world"[..]); |
| /// ``` |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> (T, U) { |
| (<span class="self">self</span>.a, <span class="self">self</span>.b) |
| } |
| } |
| |
| <span class="kw">impl</span><T, U> Buf <span class="kw">for </span>Chain<T, U> |
| <span class="kw">where |
| </span>T: Buf, |
| U: Buf, |
| { |
| <span class="kw">fn </span>remaining(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.a.remaining().checked_add(<span class="self">self</span>.b.remaining()).unwrap() |
| } |
| |
| <span class="kw">fn </span>chunk(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw">if </span><span class="self">self</span>.a.has_remaining() { |
| <span class="self">self</span>.a.chunk() |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.b.chunk() |
| } |
| } |
| |
| <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">let </span>a_rem = <span class="self">self</span>.a.remaining(); |
| |
| <span class="kw">if </span>a_rem != <span class="number">0 </span>{ |
| <span class="kw">if </span>a_rem >= cnt { |
| <span class="self">self</span>.a.advance(cnt); |
| <span class="kw">return</span>; |
| } |
| |
| <span class="comment">// Consume what is left of a |
| </span><span class="self">self</span>.a.advance(a_rem); |
| |
| cnt -= a_rem; |
| } |
| |
| <span class="self">self</span>.b.advance(cnt); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">fn </span>chunks_vectored<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, dst: <span class="kw-2">&mut </span>[IoSlice<<span class="lifetime">'a</span>>]) -> usize { |
| <span class="kw">let </span><span class="kw-2">mut </span>n = <span class="self">self</span>.a.chunks_vectored(dst); |
| n += <span class="self">self</span>.b.chunks_vectored(<span class="kw-2">&mut </span>dst[n..]); |
| n |
| } |
| |
| <span class="kw">fn </span>copy_to_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> Bytes { |
| <span class="kw">let </span>a_rem = <span class="self">self</span>.a.remaining(); |
| <span class="kw">if </span>a_rem >= len { |
| <span class="self">self</span>.a.copy_to_bytes(len) |
| } <span class="kw">else if </span>a_rem == <span class="number">0 </span>{ |
| <span class="self">self</span>.b.copy_to_bytes(len) |
| } <span class="kw">else </span>{ |
| <span class="macro">assert!</span>( |
| len - a_rem <= <span class="self">self</span>.b.remaining(), |
| <span class="string">"`len` greater than remaining" |
| </span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = <span class="kw">crate</span>::BytesMut::with_capacity(len); |
| ret.put(<span class="kw-2">&mut </span><span class="self">self</span>.a); |
| ret.put((<span class="kw-2">&mut </span><span class="self">self</span>.b).take(len - a_rem)); |
| ret.freeze() |
| } |
| } |
| } |
| |
| <span class="kw">unsafe impl</span><T, U> BufMut <span class="kw">for </span>Chain<T, U> |
| <span class="kw">where |
| </span>T: BufMut, |
| U: BufMut, |
| { |
| <span class="kw">fn </span>remaining_mut(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.a |
| .remaining_mut() |
| .saturating_add(<span class="self">self</span>.b.remaining_mut()) |
| } |
| |
| <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">if </span><span class="self">self</span>.a.has_remaining_mut() { |
| <span class="self">self</span>.a.chunk_mut() |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.b.chunk_mut() |
| } |
| } |
| |
| <span class="kw">unsafe fn </span>advance_mut(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>cnt: usize) { |
| <span class="kw">let </span>a_rem = <span class="self">self</span>.a.remaining_mut(); |
| |
| <span class="kw">if </span>a_rem != <span class="number">0 </span>{ |
| <span class="kw">if </span>a_rem >= cnt { |
| <span class="self">self</span>.a.advance_mut(cnt); |
| <span class="kw">return</span>; |
| } |
| |
| <span class="comment">// Consume what is left of a |
| </span><span class="self">self</span>.a.advance_mut(a_rem); |
| |
| cnt -= a_rem; |
| } |
| |
| <span class="self">self</span>.b.advance_mut(cnt); |
| } |
| } |
| |
| <span class="kw">impl</span><T, U> IntoIterator <span class="kw">for </span>Chain<T, U> |
| <span class="kw">where |
| </span>T: Buf, |
| U: Buf, |
| { |
| <span class="kw">type </span>Item = u8; |
| <span class="kw">type </span>IntoIter = IntoIter<Chain<T, U>>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| IntoIter::new(<span class="self">self</span>) |
| } |
| } |
| </code></pre></div> |
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