| <!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/rustls-0.19.1/rustls/src/msgs/codec.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>codec.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="../../../rustls/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="../../../rustls/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::fmt::Debug; |
| |
| <span class="doccomment">/// Read from a byte slice. |
| </span><span class="kw">pub struct </span>Reader<<span class="lifetime">'a</span>> { |
| buf: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8], |
| offs: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Reader<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>init(bytes: <span class="kw-2">&</span>[u8]) -> Reader { |
| Reader { |
| buf: bytes, |
| offs: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>rest(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw">let </span>ret = <span class="kw-2">&</span><span class="self">self</span>.buf[<span class="self">self</span>.offs..]; |
| <span class="self">self</span>.offs = <span class="self">self</span>.buf.len(); |
| ret |
| } |
| |
| <span class="kw">pub fn </span>take(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]> { |
| <span class="kw">if </span><span class="self">self</span>.left() < len { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>current = <span class="self">self</span>.offs; |
| <span class="self">self</span>.offs += len; |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.buf[current..current + len]) |
| } |
| |
| <span class="kw">pub fn </span>any_left(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.offs < <span class="self">self</span>.buf.len() |
| } |
| |
| <span class="kw">pub fn </span>left(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.buf.len() - <span class="self">self</span>.offs |
| } |
| |
| <span class="kw">pub fn </span>used(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.offs |
| } |
| |
| <span class="kw">pub fn </span>sub(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) -> <span class="prelude-ty">Option</span><Reader> { |
| <span class="self">self</span>.take(len).map(Reader::init) |
| } |
| } |
| |
| <span class="doccomment">/// Things we can encode and read from a Reader. |
| </span><span class="kw">pub trait </span>Codec: Debug + Sized { |
| <span class="doccomment">/// Encode yourself by appending onto `bytes`. |
| </span><span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>); |
| |
| <span class="doccomment">/// Decode yourself by fiddling with the `Reader`. |
| /// Return Some if it worked, None if not. |
| </span><span class="kw">fn </span>read(<span class="kw">_</span>: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Convenience function to get the results of `encode()`. |
| </span><span class="kw">fn </span>get_encoding(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<u8> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = Vec::new(); |
| <span class="self">self</span>.encode(<span class="kw-2">&mut </span>ret); |
| ret |
| } |
| |
| <span class="doccomment">/// Read one of these from the front of `bytes` and |
| /// return it. |
| </span><span class="kw">fn </span>read_bytes(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>rd = Reader::init(bytes); |
| <span class="self">Self</span>::read(<span class="kw-2">&mut </span>rd) |
| } |
| } |
| |
| <span class="comment">// Encoding functions. |
| </span><span class="kw">pub fn </span>decode_u8(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><u8> { |
| <span class="prelude-val">Some</span>(bytes[<span class="number">0</span>]) |
| } |
| |
| <span class="kw">impl </span>Codec <span class="kw">for </span>u8 { |
| <span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>) { |
| bytes.push(<span class="kw-2">*</span><span class="self">self</span>); |
| } |
| <span class="kw">fn </span>read(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><u8> { |
| r.take(<span class="number">1</span>).and_then(decode_u8) |
| } |
| } |
| |
| <span class="kw">pub fn </span>put_u16(v: u16, out: <span class="kw-2">&mut </span>[u8]) { |
| out[<span class="number">0</span>] = (v >> <span class="number">8</span>) <span class="kw">as </span>u8; |
| out[<span class="number">1</span>] = v <span class="kw">as </span>u8; |
| } |
| |
| <span class="kw">pub fn </span>decode_u16(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><u16> { |
| <span class="prelude-val">Some</span>((u16::from(bytes[<span class="number">0</span>]) << <span class="number">8</span>) | u16::from(bytes[<span class="number">1</span>])) |
| } |
| |
| <span class="kw">impl </span>Codec <span class="kw">for </span>u16 { |
| <span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>b16 = [<span class="number">0u8</span>; <span class="number">2</span>]; |
| put_u16(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">&mut </span>b16); |
| bytes.extend_from_slice(<span class="kw-2">&</span>b16); |
| } |
| |
| <span class="kw">fn </span>read(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><u16> { |
| r.take(<span class="number">2</span>).and_then(decode_u16) |
| } |
| } |
| |
| <span class="comment">// Make a distinct type for u24, even though it's a u32 underneath |
| </span><span class="attribute">#[allow(non_camel_case_types)] |
| #[derive(Debug)] |
| </span><span class="kw">pub struct </span>u24(<span class="kw">pub </span>u32); |
| |
| <span class="kw">impl </span>u24 { |
| <span class="kw">pub fn </span>decode(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><u24> { |
| <span class="prelude-val">Some</span>(u24((u32::from(bytes[<span class="number">0</span>]) << <span class="number">16</span>) |
| | (u32::from(bytes[<span class="number">1</span>]) << <span class="number">8</span>) |
| | u32::from(bytes[<span class="number">2</span>]))) |
| } |
| } |
| |
| <span class="kw">impl </span>Codec <span class="kw">for </span>u24 { |
| <span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>) { |
| bytes.push((<span class="self">self</span>.<span class="number">0 </span>>> <span class="number">16</span>) <span class="kw">as </span>u8); |
| bytes.push((<span class="self">self</span>.<span class="number">0 </span>>> <span class="number">8</span>) <span class="kw">as </span>u8); |
| bytes.push(<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>u8); |
| } |
| |
| <span class="kw">fn </span>read(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><u24> { |
| r.take(<span class="number">3</span>).and_then(u24::decode) |
| } |
| } |
| |
| <span class="kw">pub fn </span>decode_u32(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><u32> { |
| <span class="prelude-val">Some</span>( |
| (u32::from(bytes[<span class="number">0</span>]) << <span class="number">24</span>) |
| | (u32::from(bytes[<span class="number">1</span>]) << <span class="number">16</span>) |
| | (u32::from(bytes[<span class="number">2</span>]) << <span class="number">8</span>) |
| | u32::from(bytes[<span class="number">3</span>]), |
| ) |
| } |
| |
| <span class="kw">impl </span>Codec <span class="kw">for </span>u32 { |
| <span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>) { |
| bytes.push((<span class="kw-2">*</span><span class="self">self </span>>> <span class="number">24</span>) <span class="kw">as </span>u8); |
| bytes.push((<span class="kw-2">*</span><span class="self">self </span>>> <span class="number">16</span>) <span class="kw">as </span>u8); |
| bytes.push((<span class="kw-2">*</span><span class="self">self </span>>> <span class="number">8</span>) <span class="kw">as </span>u8); |
| bytes.push(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8); |
| } |
| |
| <span class="kw">fn </span>read(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><u32> { |
| r.take(<span class="number">4</span>).and_then(decode_u32) |
| } |
| } |
| |
| <span class="kw">pub fn </span>put_u64(v: u64, bytes: <span class="kw-2">&mut </span>[u8]) { |
| bytes[<span class="number">0</span>] = (v >> <span class="number">56</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">1</span>] = (v >> <span class="number">48</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">2</span>] = (v >> <span class="number">40</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">3</span>] = (v >> <span class="number">32</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">4</span>] = (v >> <span class="number">24</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">5</span>] = (v >> <span class="number">16</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">6</span>] = (v >> <span class="number">8</span>) <span class="kw">as </span>u8; |
| bytes[<span class="number">7</span>] = v <span class="kw">as </span>u8; |
| } |
| |
| <span class="kw">pub fn </span>decode_u64(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><u64> { |
| <span class="prelude-val">Some</span>( |
| (u64::from(bytes[<span class="number">0</span>]) << <span class="number">56</span>) |
| | (u64::from(bytes[<span class="number">1</span>]) << <span class="number">48</span>) |
| | (u64::from(bytes[<span class="number">2</span>]) << <span class="number">40</span>) |
| | (u64::from(bytes[<span class="number">3</span>]) << <span class="number">32</span>) |
| | (u64::from(bytes[<span class="number">4</span>]) << <span class="number">24</span>) |
| | (u64::from(bytes[<span class="number">5</span>]) << <span class="number">16</span>) |
| | (u64::from(bytes[<span class="number">6</span>]) << <span class="number">8</span>) |
| | u64::from(bytes[<span class="number">7</span>]), |
| ) |
| } |
| |
| <span class="kw">impl </span>Codec <span class="kw">for </span>u64 { |
| <span class="kw">fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&mut </span>Vec<u8>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>b64 = [<span class="number">0u8</span>; <span class="number">8</span>]; |
| put_u64(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">&mut </span>b64); |
| bytes.extend_from_slice(<span class="kw-2">&</span>b64); |
| } |
| |
| <span class="kw">fn </span>read(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><u64> { |
| r.take(<span class="number">8</span>).and_then(decode_u64) |
| } |
| } |
| |
| <span class="kw">pub fn </span>encode_vec_u8<T: Codec>(bytes: <span class="kw-2">&mut </span>Vec<u8>, items: <span class="kw-2">&</span>[T]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>sub: Vec<u8> = Vec::new(); |
| <span class="kw">for </span>i <span class="kw">in </span>items { |
| i.encode(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="macro">debug_assert!</span>(sub.len() <= <span class="number">0xff</span>); |
| (sub.len() <span class="kw">as </span>u8).encode(bytes); |
| bytes.append(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="kw">pub fn </span>encode_vec_u16<T: Codec>(bytes: <span class="kw-2">&mut </span>Vec<u8>, items: <span class="kw-2">&</span>[T]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>sub: Vec<u8> = Vec::new(); |
| <span class="kw">for </span>i <span class="kw">in </span>items { |
| i.encode(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="macro">debug_assert!</span>(sub.len() <= <span class="number">0xffff</span>); |
| (sub.len() <span class="kw">as </span>u16).encode(bytes); |
| bytes.append(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="kw">pub fn </span>encode_vec_u24<T: Codec>(bytes: <span class="kw-2">&mut </span>Vec<u8>, items: <span class="kw-2">&</span>[T]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>sub: Vec<u8> = Vec::new(); |
| <span class="kw">for </span>i <span class="kw">in </span>items { |
| i.encode(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="macro">debug_assert!</span>(sub.len() <= <span class="number">0xff_ffff</span>); |
| u24(sub.len() <span class="kw">as </span>u32).encode(bytes); |
| bytes.append(<span class="kw-2">&mut </span>sub); |
| } |
| |
| <span class="kw">pub fn </span>read_vec_u8<T: Codec>(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><Vec<T>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: Vec<T> = Vec::new(); |
| <span class="kw">let </span>len = usize::from(u8::read(r)<span class="question-mark">?</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>sub = r.sub(len)<span class="question-mark">?</span>; |
| |
| <span class="kw">while </span>sub.any_left() { |
| ret.push(T::read(<span class="kw-2">&mut </span>sub)<span class="question-mark">?</span>); |
| } |
| |
| <span class="prelude-val">Some</span>(ret) |
| } |
| |
| <span class="kw">pub fn </span>read_vec_u16<T: Codec>(r: <span class="kw-2">&mut </span>Reader) -> <span class="prelude-ty">Option</span><Vec<T>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: Vec<T> = Vec::new(); |
| <span class="kw">let </span>len = usize::from(u16::read(r)<span class="question-mark">?</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>sub = r.sub(len)<span class="question-mark">?</span>; |
| |
| <span class="kw">while </span>sub.any_left() { |
| ret.push(T::read(<span class="kw-2">&mut </span>sub)<span class="question-mark">?</span>); |
| } |
| |
| <span class="prelude-val">Some</span>(ret) |
| } |
| |
| <span class="kw">pub fn </span>read_vec_u24_limited<T: Codec>(r: <span class="kw-2">&mut </span>Reader, max_bytes: usize) -> <span class="prelude-ty">Option</span><Vec<T>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: Vec<T> = Vec::new(); |
| <span class="kw">let </span>len = u24::read(r)<span class="question-mark">?</span>.<span class="number">0 </span><span class="kw">as </span>usize; |
| <span class="kw">if </span>len > max_bytes { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>sub = r.sub(len)<span class="question-mark">?</span>; |
| |
| <span class="kw">while </span>sub.any_left() { |
| ret.push(T::read(<span class="kw-2">&mut </span>sub)<span class="question-mark">?</span>); |
| } |
| |
| <span class="prelude-val">Some</span>(ret) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rustls" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
