| <!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/body/length.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>length.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::fmt; |
| |
| <span class="attribute">#[derive(Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>DecodedLength(u64); |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"http1"</span>, feature = <span class="string">"http2"</span>))] |
| </span><span class="kw">impl </span>From<<span class="prelude-ty">Option</span><u64>> <span class="kw">for </span>DecodedLength { |
| <span class="kw">fn </span>from(len: <span class="prelude-ty">Option</span><u64>) -> <span class="self">Self </span>{ |
| len.and_then(|len| { |
| <span class="comment">// If the length is u64::MAX, oh well, just reported chunked. |
| </span><span class="self">Self</span>::checked_new(len).ok() |
| }) |
| .unwrap_or(DecodedLength::CHUNKED) |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"http1"</span>, feature = <span class="string">"http2"</span>, test))] |
| </span><span class="kw">const </span>MAX_LEN: u64 = std::u64::MAX - <span class="number">2</span>; |
| |
| <span class="kw">impl </span>DecodedLength { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>CLOSE_DELIMITED: DecodedLength = DecodedLength(::std::u64::MAX); |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>CHUNKED: DecodedLength = DecodedLength(::std::u64::MAX - <span class="number">1</span>); |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>ZERO: DecodedLength = DecodedLength(<span class="number">0</span>); |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(len: u64) -> <span class="self">Self </span>{ |
| <span class="macro">debug_assert!</span>(len <= MAX_LEN); |
| DecodedLength(len) |
| } |
| |
| <span class="doccomment">/// Takes the length as a content-length without other checks. |
| /// |
| /// Should only be called if previously confirmed this isn't |
| /// CLOSE_DELIMITED or CHUNKED. |
| </span><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>danger_len(<span class="self">self</span>) -> u64 { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.<span class="number">0 </span>< <span class="self">Self</span>::CHUNKED.<span class="number">0</span>); |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Converts to an Option<u64> representing a Known or Unknown length. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>into_opt(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><u64> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| DecodedLength::CHUNKED | DecodedLength::CLOSE_DELIMITED => <span class="prelude-val">None</span>, |
| DecodedLength(known) => <span class="prelude-val">Some</span>(known), |
| } |
| } |
| |
| <span class="doccomment">/// Checks the `u64` is within the maximum allowed for content-length. |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"http1"</span>, feature = <span class="string">"http2"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>checked_new(len: u64) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="kw">crate</span>::error::Parse> { |
| <span class="kw">use </span>tracing::warn; |
| |
| <span class="kw">if </span>len <= MAX_LEN { |
| <span class="prelude-val">Ok</span>(DecodedLength(len)) |
| } <span class="kw">else </span>{ |
| <span class="macro">warn!</span>(<span class="string">"content-length bigger than maximum: {} > {}"</span>, len, MAX_LEN); |
| <span class="prelude-val">Err</span>(<span class="kw">crate</span>::error::Parse::TooLarge) |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>sub_if(<span class="kw-2">&mut </span><span class="self">self</span>, amt: u64) { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| DecodedLength::CHUNKED | DecodedLength::CLOSE_DELIMITED => (), |
| DecodedLength(<span class="kw-2">ref mut </span>known) => { |
| <span class="kw-2">*</span>known -= amt; |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns whether this represents an exact length. |
| /// |
| /// This includes 0, which of course is an exact known length. |
| /// |
| /// It would return false if "chunked" or otherwise size-unknown. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"http2"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_exact(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0 </span><= MAX_LEN |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>DecodedLength { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| DecodedLength::CLOSE_DELIMITED => f.write_str(<span class="string">"CLOSE_DELIMITED"</span>), |
| DecodedLength::CHUNKED => f.write_str(<span class="string">"CHUNKED"</span>), |
| DecodedLength(n) => f.debug_tuple(<span class="string">"DecodedLength"</span>).field(<span class="kw-2">&</span>n).finish(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>DecodedLength { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| DecodedLength::CLOSE_DELIMITED => f.write_str(<span class="string">"close-delimited"</span>), |
| DecodedLength::CHUNKED => f.write_str(<span class="string">"chunked encoding"</span>), |
| DecodedLength::ZERO => f.write_str(<span class="string">"empty"</span>), |
| DecodedLength(n) => <span class="macro">write!</span>(f, <span class="string">"content-length ({} bytes)"</span>, n), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>sub_if_known() { |
| <span class="kw">let </span><span class="kw-2">mut </span>len = DecodedLength::new(<span class="number">30</span>); |
| len.sub_if(<span class="number">20</span>); |
| |
| <span class="macro">assert_eq!</span>(len.<span class="number">0</span>, <span class="number">10</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>sub_if_chunked() { |
| <span class="kw">let </span><span class="kw-2">mut </span>len = DecodedLength::CHUNKED; |
| len.sub_if(<span class="number">20</span>); |
| |
| <span class="macro">assert_eq!</span>(len, DecodedLength::CHUNKED); |
| } |
| } |
| </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> |
