| <!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/h2-0.3.19/src/hpack/table.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>table.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="../../../h2/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="../../../h2/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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| <span id="764">764</span> |
| <span id="765">765</span> |
| <span id="766">766</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::Header; |
| |
| <span class="kw">use </span>fnv::FnvHasher; |
| <span class="kw">use </span>http::header; |
| <span class="kw">use </span>http::method::Method; |
| |
| <span class="kw">use </span>std::collections::VecDeque; |
| <span class="kw">use </span>std::hash::{Hash, Hasher}; |
| <span class="kw">use </span>std::{cmp, mem, usize}; |
| |
| <span class="doccomment">/// HPACK encoder table |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Table { |
| mask: usize, |
| indices: Vec<<span class="prelude-ty">Option</span><Pos>>, |
| slots: VecDeque<Slot>, |
| inserted: usize, |
| <span class="comment">// Size is in bytes |
| </span>size: usize, |
| max_size: usize, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub enum </span>Index { |
| <span class="comment">// The header is already fully indexed |
| </span>Indexed(usize, Header), |
| |
| <span class="comment">// The name is indexed, but not the value |
| </span>Name(usize, Header), |
| |
| <span class="comment">// The full header has been inserted into the table. |
| </span>Inserted(usize), |
| |
| <span class="comment">// Only the value has been inserted (hpack table idx, slots idx) |
| </span>InsertedValue(usize, usize), |
| |
| <span class="comment">// The header is not indexed by this table |
| </span>NotIndexed(Header), |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Slot { |
| hash: HashValue, |
| header: Header, |
| next: <span class="prelude-ty">Option</span><usize>, |
| } |
| |
| <span class="attribute">#[derive(Debug, Clone, Copy, Eq, PartialEq)] |
| </span><span class="kw">struct </span>Pos { |
| index: usize, |
| hash: HashValue, |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Eq, PartialEq)] |
| </span><span class="kw">struct </span>HashValue(usize); |
| |
| <span class="kw">const </span>MAX_SIZE: usize = <span class="number">1 </span><< <span class="number">16</span>; |
| <span class="kw">const </span>DYN_OFFSET: usize = <span class="number">62</span>; |
| |
| <span class="macro">macro_rules! </span>probe_loop { |
| (<span class="macro-nonterminal">$probe_var</span>: ident < <span class="macro-nonterminal">$len</span>: expr, <span class="macro-nonterminal">$body</span>: expr) => { |
| <span class="macro">debug_assert!</span>(<span class="macro-nonterminal">$len </span>> <span class="number">0</span>); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span><span class="macro-nonterminal">$probe_var </span>< <span class="macro-nonterminal">$len </span>{ |
| <span class="macro-nonterminal">$body |
| $probe_var </span>+= <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| <span class="macro-nonterminal">$probe_var </span>= <span class="number">0</span>; |
| } |
| } |
| }; |
| } |
| |
| <span class="kw">impl </span>Table { |
| <span class="kw">pub fn </span>new(max_size: usize, capacity: usize) -> Table { |
| <span class="kw">if </span>capacity == <span class="number">0 </span>{ |
| Table { |
| mask: <span class="number">0</span>, |
| indices: <span class="macro">vec!</span>[], |
| slots: VecDeque::new(), |
| inserted: <span class="number">0</span>, |
| size: <span class="number">0</span>, |
| max_size, |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>capacity = cmp::max(to_raw_capacity(capacity).next_power_of_two(), <span class="number">8</span>); |
| |
| Table { |
| mask: capacity.wrapping_sub(<span class="number">1</span>), |
| indices: <span class="macro">vec!</span>[<span class="prelude-val">None</span>; capacity], |
| slots: VecDeque::with_capacity(usable_capacity(capacity)), |
| inserted: <span class="number">0</span>, |
| size: <span class="number">0</span>, |
| max_size, |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| usable_capacity(<span class="self">self</span>.indices.len()) |
| } |
| |
| <span class="kw">pub fn </span>max_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.max_size |
| } |
| |
| <span class="doccomment">/// Gets the header stored in the table |
| </span><span class="kw">pub fn </span>resolve<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, index: <span class="kw-2">&</span><span class="lifetime">'a </span>Index) -> <span class="kw-2">&</span><span class="lifetime">'a </span>Header { |
| <span class="kw">use </span><span class="self">self</span>::Index::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="kw-2">*</span>index { |
| Indexed(<span class="kw">_</span>, <span class="kw-2">ref </span>h) => h, |
| Name(<span class="kw">_</span>, <span class="kw-2">ref </span>h) => h, |
| Inserted(idx) => <span class="kw-2">&</span><span class="self">self</span>.slots[idx].header, |
| InsertedValue(<span class="kw">_</span>, idx) => <span class="kw-2">&</span><span class="self">self</span>.slots[idx].header, |
| NotIndexed(<span class="kw-2">ref </span>h) => h, |
| } |
| } |
| |
| <span class="kw">pub fn </span>resolve_idx(<span class="kw-2">&</span><span class="self">self</span>, index: <span class="kw-2">&</span>Index) -> usize { |
| <span class="kw">use </span><span class="self">self</span>::Index::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="kw-2">*</span>index { |
| Indexed(idx, ..) => idx, |
| Name(idx, ..) => idx, |
| Inserted(idx) => idx + DYN_OFFSET, |
| InsertedValue(_name_idx, slot_idx) => slot_idx + DYN_OFFSET, |
| NotIndexed(<span class="kw">_</span>) => <span class="macro">panic!</span>(<span class="string">"cannot resolve index"</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Index the header in the HPACK table. |
| </span><span class="kw">pub fn </span>index(<span class="kw-2">&mut </span><span class="self">self</span>, header: Header) -> Index { |
| <span class="comment">// Check the static table |
| </span><span class="kw">let </span>statik = index_static(<span class="kw-2">&</span>header); |
| |
| <span class="comment">// Don't index certain headers. This logic is borrowed from nghttp2. |
| </span><span class="kw">if </span>header.skip_value_index() { |
| <span class="comment">// Right now, if this is true, the header name is always in the |
| // static table. At some point in the future, this might not be true |
| // and this logic will need to be updated. |
| </span><span class="macro">debug_assert!</span>(statik.is_some(), <span class="string">"skip_value_index requires a static name"</span>,); |
| <span class="kw">return </span>Index::new(statik, header); |
| } |
| |
| <span class="comment">// If the header is already indexed by the static table, return that |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>((n, <span class="bool-val">true</span>)) = statik { |
| <span class="kw">return </span>Index::Indexed(n, header); |
| } |
| |
| <span class="comment">// Don't index large headers |
| </span><span class="kw">if </span>header.len() * <span class="number">4 </span>> <span class="self">self</span>.max_size * <span class="number">3 </span>{ |
| <span class="kw">return </span>Index::new(statik, header); |
| } |
| |
| <span class="self">self</span>.index_dynamic(header, statik) |
| } |
| |
| <span class="kw">fn </span>index_dynamic(<span class="kw-2">&mut </span><span class="self">self</span>, header: Header, statik: <span class="prelude-ty">Option</span><(usize, bool)>) -> Index { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"one"</span>)); |
| |
| <span class="kw">if </span>header.len() + <span class="self">self</span>.size < <span class="self">self</span>.max_size || !header.is_sensitive() { |
| <span class="comment">// Only grow internal storage if needed |
| </span><span class="self">self</span>.reserve_one(); |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.indices.is_empty() { |
| <span class="comment">// If `indices` is not empty, then it is impossible for all |
| // `indices` entries to be `Some`. So, we only need to check for the |
| // empty case. |
| </span><span class="kw">return </span>Index::new(statik, header); |
| } |
| |
| <span class="kw">let </span>hash = hash_header(<span class="kw-2">&</span>header); |
| |
| <span class="kw">let </span>desired_pos = desired_pos(<span class="self">self</span>.mask, hash); |
| <span class="kw">let </span><span class="kw-2">mut </span>probe = desired_pos; |
| <span class="kw">let </span><span class="kw-2">mut </span>dist = <span class="number">0</span>; |
| |
| <span class="comment">// Start at the ideal position, checking all slots |
| </span><span class="macro">probe_loop!</span>(probe < <span class="self">self</span>.indices.len(), { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pos) = <span class="self">self</span>.indices[probe] { |
| <span class="comment">// The slot is already occupied, but check if it has a lower |
| // displacement. |
| </span><span class="kw">let </span>their_dist = probe_distance(<span class="self">self</span>.mask, pos.hash, probe); |
| |
| <span class="kw">let </span>slot_idx = pos.index.wrapping_add(<span class="self">self</span>.inserted); |
| |
| <span class="kw">if </span>their_dist < dist { |
| <span class="comment">// Index robinhood |
| </span><span class="kw">return </span><span class="self">self</span>.index_vacant(header, hash, dist, probe, statik); |
| } <span class="kw">else if </span>pos.hash == hash && <span class="self">self</span>.slots[slot_idx].header.name() == header.name() { |
| <span class="comment">// Matching name, check values |
| </span><span class="kw">return </span><span class="self">self</span>.index_occupied(header, hash, pos.index, statik.map(|(n, <span class="kw">_</span>)| n)); |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="self">self</span>.index_vacant(header, hash, dist, probe, statik); |
| } |
| |
| dist += <span class="number">1</span>; |
| }); |
| } |
| |
| <span class="kw">fn </span>index_occupied( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| header: Header, |
| hash: HashValue, |
| <span class="kw-2">mut </span>index: usize, |
| statik: <span class="prelude-ty">Option</span><usize>, |
| ) -> Index { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"top"</span>)); |
| |
| <span class="comment">// There already is a match for the given header name. Check if a value |
| // matches. The header will also only be inserted if the table is not at |
| // capacity. |
| </span><span class="kw">loop </span>{ |
| <span class="comment">// Compute the real index into the VecDeque |
| </span><span class="kw">let </span>real_idx = index.wrapping_add(<span class="self">self</span>.inserted); |
| |
| <span class="kw">if </span><span class="self">self</span>.slots[real_idx].header.value_eq(<span class="kw-2">&</span>header) { |
| <span class="comment">// We have a full match! |
| </span><span class="kw">return </span>Index::Indexed(real_idx + DYN_OFFSET, header); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(next) = <span class="self">self</span>.slots[real_idx].next { |
| index = next; |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">if </span>header.is_sensitive() { |
| <span class="comment">// Should we assert this? |
| // debug_assert!(statik.is_none()); |
| </span><span class="kw">return </span>Index::Name(real_idx + DYN_OFFSET, header); |
| } |
| |
| <span class="self">self</span>.update_size(header.len(), <span class="prelude-val">Some</span>(index)); |
| |
| <span class="comment">// Insert the new header |
| </span><span class="self">self</span>.insert(header, hash); |
| |
| <span class="comment">// Recompute real_idx as it just changed. |
| </span><span class="kw">let </span>new_real_idx = index.wrapping_add(<span class="self">self</span>.inserted); |
| |
| <span class="comment">// The previous node in the linked list may have gotten evicted |
| // while making room for this header. |
| </span><span class="kw">if </span>new_real_idx < <span class="self">self</span>.slots.len() { |
| <span class="kw">let </span>idx = <span class="number">0usize</span>.wrapping_sub(<span class="self">self</span>.inserted); |
| |
| <span class="self">self</span>.slots[new_real_idx].next = <span class="prelude-val">Some</span>(idx); |
| } |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"bottom"</span>)); |
| |
| <span class="comment">// Even if the previous header was evicted, we can still reference |
| // it when inserting the new one... |
| </span><span class="kw">return if let </span><span class="prelude-val">Some</span>(n) = statik { |
| <span class="comment">// If name is in static table, use it instead |
| </span>Index::InsertedValue(n, <span class="number">0</span>) |
| } <span class="kw">else </span>{ |
| Index::InsertedValue(real_idx + DYN_OFFSET, <span class="number">0</span>) |
| }; |
| } |
| } |
| |
| <span class="kw">fn </span>index_vacant( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| header: Header, |
| hash: HashValue, |
| <span class="kw-2">mut </span>dist: usize, |
| <span class="kw-2">mut </span>probe: usize, |
| statik: <span class="prelude-ty">Option</span><(usize, bool)>, |
| ) -> Index { |
| <span class="kw">if </span>header.is_sensitive() { |
| <span class="kw">return </span>Index::new(statik, header); |
| } |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"top"</span>)); |
| <span class="macro">debug_assert!</span>(dist == <span class="number">0 </span>|| <span class="self">self</span>.indices[probe.wrapping_sub(<span class="number">1</span>) & <span class="self">self</span>.mask].is_some()); |
| |
| <span class="comment">// Passing in `usize::MAX` for prev_idx since there is no previous |
| // header in this case. |
| </span><span class="kw">if </span><span class="self">self</span>.update_size(header.len(), <span class="prelude-val">None</span>) { |
| <span class="kw">while </span>dist != <span class="number">0 </span>{ |
| <span class="kw">let </span>back = probe.wrapping_sub(<span class="number">1</span>) & <span class="self">self</span>.mask; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pos) = <span class="self">self</span>.indices[back] { |
| <span class="kw">let </span>their_dist = probe_distance(<span class="self">self</span>.mask, pos.hash, back); |
| |
| <span class="kw">if </span>their_dist < (dist - <span class="number">1</span>) { |
| probe = back; |
| dist -= <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } <span class="kw">else </span>{ |
| probe = back; |
| dist -= <span class="number">1</span>; |
| } |
| } |
| } |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"after update"</span>)); |
| |
| <span class="self">self</span>.insert(header, hash); |
| |
| <span class="kw">let </span>pos_idx = <span class="number">0usize</span>.wrapping_sub(<span class="self">self</span>.inserted); |
| |
| <span class="kw">let </span>prev = mem::replace( |
| <span class="kw-2">&mut </span><span class="self">self</span>.indices[probe], |
| <span class="prelude-val">Some</span>(Pos { |
| index: pos_idx, |
| hash, |
| }), |
| ); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>prev) = prev { |
| <span class="comment">// Shift forward |
| </span><span class="kw">let </span><span class="kw-2">mut </span>probe = probe + <span class="number">1</span>; |
| |
| <span class="macro">probe_loop!</span>(probe < <span class="self">self</span>.indices.len(), { |
| <span class="kw">let </span>pos = <span class="kw-2">&mut </span><span class="self">self</span>.indices[probe <span class="kw">as </span>usize]; |
| |
| prev = <span class="kw">match </span>mem::replace(pos, <span class="prelude-val">Some</span>(prev)) { |
| <span class="prelude-val">Some</span>(p) => p, |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| }; |
| }); |
| } |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"bottom"</span>)); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((n, <span class="kw">_</span>)) = statik { |
| Index::InsertedValue(n, <span class="number">0</span>) |
| } <span class="kw">else </span>{ |
| Index::Inserted(<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, header: Header, hash: HashValue) { |
| <span class="self">self</span>.inserted = <span class="self">self</span>.inserted.wrapping_add(<span class="number">1</span>); |
| |
| <span class="self">self</span>.slots.push_front(Slot { |
| hash, |
| header, |
| next: <span class="prelude-val">None</span>, |
| }); |
| } |
| |
| <span class="kw">pub fn </span>resize(<span class="kw-2">&mut </span><span class="self">self</span>, size: usize) { |
| <span class="self">self</span>.max_size = size; |
| |
| <span class="kw">if </span>size == <span class="number">0 </span>{ |
| <span class="self">self</span>.size = <span class="number">0</span>; |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.indices { |
| <span class="kw-2">*</span>i = <span class="prelude-val">None</span>; |
| } |
| |
| <span class="self">self</span>.slots.clear(); |
| <span class="self">self</span>.inserted = <span class="number">0</span>; |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.converge(<span class="prelude-val">None</span>); |
| } |
| } |
| |
| <span class="kw">fn </span>update_size(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize, prev_idx: <span class="prelude-ty">Option</span><usize>) -> bool { |
| <span class="self">self</span>.size += len; |
| <span class="self">self</span>.converge(prev_idx) |
| } |
| |
| <span class="kw">fn </span>converge(<span class="kw-2">&mut </span><span class="self">self</span>, prev_idx: <span class="prelude-ty">Option</span><usize>) -> bool { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = <span class="bool-val">false</span>; |
| |
| <span class="kw">while </span><span class="self">self</span>.size > <span class="self">self</span>.max_size { |
| ret = <span class="bool-val">true</span>; |
| <span class="self">self</span>.evict(prev_idx); |
| } |
| |
| ret |
| } |
| |
| <span class="kw">fn </span>evict(<span class="kw-2">&mut </span><span class="self">self</span>, prev_idx: <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>pos_idx = (<span class="self">self</span>.slots.len() - <span class="number">1</span>).wrapping_sub(<span class="self">self</span>.inserted); |
| |
| <span class="macro">debug_assert!</span>(!<span class="self">self</span>.slots.is_empty()); |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"one"</span>)); |
| |
| <span class="comment">// Remove the header |
| </span><span class="kw">let </span>slot = <span class="self">self</span>.slots.pop_back().unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>probe = desired_pos(<span class="self">self</span>.mask, slot.hash); |
| |
| <span class="comment">// Update the size |
| </span><span class="self">self</span>.size -= slot.header.len(); |
| |
| <span class="macro">debug_assert_eq!</span>( |
| <span class="self">self</span>.indices |
| .iter() |
| .filter_map(|p| <span class="kw-2">*</span>p) |
| .filter(|p| p.index == pos_idx) |
| .count(), |
| <span class="number">1 |
| </span>); |
| |
| <span class="comment">// Find the associated position |
| </span><span class="macro">probe_loop!</span>(probe < <span class="self">self</span>.indices.len(), { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.indices[probe].is_some()); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pos = <span class="self">self</span>.indices[probe].unwrap(); |
| |
| <span class="kw">if </span>pos.index == pos_idx { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(idx) = slot.next { |
| pos.index = idx; |
| <span class="self">self</span>.indices[probe] = <span class="prelude-val">Some</span>(pos); |
| } <span class="kw">else if </span><span class="prelude-val">Some</span>(pos.index) == prev_idx { |
| pos.index = <span class="number">0usize</span>.wrapping_sub(<span class="self">self</span>.inserted + <span class="number">1</span>); |
| <span class="self">self</span>.indices[probe] = <span class="prelude-val">Some</span>(pos); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.indices[probe] = <span class="prelude-val">None</span>; |
| <span class="self">self</span>.remove_phase_two(probe); |
| } |
| |
| <span class="kw">break</span>; |
| } |
| }); |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"two"</span>)); |
| } |
| |
| <span class="comment">// Shifts all indices that were displaced by the header that has just been |
| // removed. |
| </span><span class="kw">fn </span>remove_phase_two(<span class="kw-2">&mut </span><span class="self">self</span>, probe: usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>last_probe = probe; |
| <span class="kw">let </span><span class="kw-2">mut </span>probe = probe + <span class="number">1</span>; |
| |
| <span class="macro">probe_loop!</span>(probe < <span class="self">self</span>.indices.len(), { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pos) = <span class="self">self</span>.indices[probe] { |
| <span class="kw">if </span>probe_distance(<span class="self">self</span>.mask, pos.hash, probe) > <span class="number">0 </span>{ |
| <span class="self">self</span>.indices[last_probe] = <span class="self">self</span>.indices[probe].take(); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| |
| last_probe = probe; |
| }); |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"two"</span>)); |
| } |
| |
| <span class="kw">fn </span>reserve_one(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span>len = <span class="self">self</span>.slots.len(); |
| |
| <span class="kw">if </span>len == <span class="self">self</span>.capacity() { |
| <span class="kw">if </span>len == <span class="number">0 </span>{ |
| <span class="kw">let </span>new_raw_cap = <span class="number">8</span>; |
| <span class="self">self</span>.mask = <span class="number">8 </span>- <span class="number">1</span>; |
| <span class="self">self</span>.indices = <span class="macro">vec!</span>[<span class="prelude-val">None</span>; new_raw_cap]; |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>raw_cap = <span class="self">self</span>.indices.len(); |
| <span class="self">self</span>.grow(raw_cap << <span class="number">1</span>); |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>grow(<span class="kw-2">&mut </span><span class="self">self</span>, new_raw_cap: usize) { |
| <span class="comment">// This path can never be reached when handling the first allocation in |
| // the map. |
| |
| </span><span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"top"</span>)); |
| |
| <span class="comment">// find first ideally placed element -- start of cluster |
| </span><span class="kw">let </span><span class="kw-2">mut </span>first_ideal = <span class="number">0</span>; |
| |
| <span class="kw">for </span>(i, pos) <span class="kw">in </span><span class="self">self</span>.indices.iter().enumerate() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pos) = <span class="kw-2">*</span>pos { |
| <span class="kw">if </span><span class="number">0 </span>== probe_distance(<span class="self">self</span>.mask, pos.hash, i) { |
| first_ideal = i; |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| |
| <span class="comment">// visit the entries in an order where we can simply reinsert them |
| // into self.indices without any bucket stealing. |
| </span><span class="kw">let </span>old_indices = mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.indices, <span class="macro">vec!</span>[<span class="prelude-val">None</span>; new_raw_cap]); |
| <span class="self">self</span>.mask = new_raw_cap.wrapping_sub(<span class="number">1</span>); |
| |
| <span class="kw">for </span><span class="kw-2">&</span>pos <span class="kw">in </span><span class="kw-2">&</span>old_indices[first_ideal..] { |
| <span class="self">self</span>.reinsert_entry_in_order(pos); |
| } |
| |
| <span class="kw">for </span><span class="kw-2">&</span>pos <span class="kw">in </span><span class="kw-2">&</span>old_indices[..first_ideal] { |
| <span class="self">self</span>.reinsert_entry_in_order(pos); |
| } |
| |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.assert_valid_state(<span class="string">"bottom"</span>)); |
| } |
| |
| <span class="kw">fn </span>reinsert_entry_in_order(<span class="kw-2">&mut </span><span class="self">self</span>, pos: <span class="prelude-ty">Option</span><Pos>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pos) = pos { |
| <span class="comment">// Find first empty bucket and insert there |
| </span><span class="kw">let </span><span class="kw-2">mut </span>probe = desired_pos(<span class="self">self</span>.mask, pos.hash); |
| |
| <span class="macro">probe_loop!</span>(probe < <span class="self">self</span>.indices.len(), { |
| <span class="kw">if </span><span class="self">self</span>.indices[probe].is_none() { |
| <span class="comment">// empty bucket, insert here |
| </span><span class="self">self</span>.indices[probe] = <span class="prelude-val">Some</span>(pos); |
| <span class="kw">return</span>; |
| } |
| |
| <span class="macro">debug_assert!</span>({ |
| <span class="kw">let </span>them = <span class="self">self</span>.indices[probe].unwrap(); |
| <span class="kw">let </span>their_distance = probe_distance(<span class="self">self</span>.mask, them.hash, probe); |
| <span class="kw">let </span>our_distance = probe_distance(<span class="self">self</span>.mask, pos.hash, probe); |
| |
| their_distance >= our_distance |
| }); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(test))] |
| </span><span class="kw">fn </span>assert_valid_state(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> bool { |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">fn </span>assert_valid_state(<span class="kw-2">&</span><span class="self">self</span>, _msg: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> bool { |
| <span class="comment">/* |
| // Checks that the internal map structure is valid |
| // |
| // Ensure all hash codes in indices match the associated slot |
| for pos in &self.indices { |
| if let Some(pos) = *pos { |
| let real_idx = pos.index.wrapping_add(self.inserted); |
| |
| if real_idx.wrapping_add(1) != 0 { |
| assert!(real_idx < self.slots.len(), |
| "out of index; real={}; len={}, msg={}", |
| real_idx, self.slots.len(), msg); |
| |
| assert_eq!(pos.hash, self.slots[real_idx].hash, |
| "index hash does not match slot; msg={}", msg); |
| } |
| } |
| } |
| |
| // Every index is only available once |
| for i in 0..self.indices.len() { |
| if self.indices[i].is_none() { |
| continue; |
| } |
| |
| for j in i+1..self.indices.len() { |
| assert_ne!(self.indices[i], self.indices[j], |
| "duplicate indices; msg={}", msg); |
| } |
| } |
| |
| for (index, slot) in self.slots.iter().enumerate() { |
| let mut indexed = None; |
| |
| // First, see if the slot is indexed |
| for (i, pos) in self.indices.iter().enumerate() { |
| if let Some(pos) = *pos { |
| let real_idx = pos.index.wrapping_add(self.inserted); |
| if real_idx == index { |
| indexed = Some(i); |
| // Already know that there is no dup, so break |
| break; |
| } |
| } |
| } |
| |
| if let Some(actual) = indexed { |
| // Ensure that it is accessible.. |
| let desired = desired_pos(self.mask, slot.hash); |
| let mut probe = desired; |
| let mut dist = 0; |
| |
| probe_loop!(probe < self.indices.len(), { |
| assert!(self.indices[probe].is_some(), |
| "unexpected empty slot; probe={}; hash={:?}; msg={}", |
| probe, slot.hash, msg); |
| |
| let pos = self.indices[probe].unwrap(); |
| |
| let their_dist = probe_distance(self.mask, pos.hash, probe); |
| let real_idx = pos.index.wrapping_add(self.inserted); |
| |
| if real_idx == index { |
| break; |
| } |
| |
| assert!(dist <= their_dist, |
| "could not find entry; actual={}; desired={}" + |
| "probe={}, dist={}; their_dist={}; index={}; msg={}", |
| actual, desired, probe, dist, their_dist, |
| index.wrapping_sub(self.inserted), msg); |
| |
| dist += 1; |
| }); |
| } else { |
| // There is exactly one next link |
| let cnt = self.slots.iter().map(|s| s.next) |
| .filter(|n| *n == Some(index.wrapping_sub(self.inserted))) |
| .count(); |
| |
| assert_eq!(1, cnt, "more than one node pointing here; msg={}", msg); |
| } |
| } |
| */ |
| |
| // TODO: Ensure linked lists are correct: no cycles, etc... |
| |
| </span><span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">impl </span>Table { |
| <span class="doccomment">/// Returns the number of headers in the table |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.slots.len() |
| } |
| |
| <span class="doccomment">/// Returns the table size |
| </span><span class="kw">pub fn </span>size(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.size |
| } |
| } |
| |
| <span class="kw">impl </span>Index { |
| <span class="kw">fn </span>new(v: <span class="prelude-ty">Option</span><(usize, bool)>, e: Header) -> Index { |
| <span class="kw">match </span>v { |
| <span class="prelude-val">None </span>=> Index::NotIndexed(e), |
| <span class="prelude-val">Some</span>((n, <span class="bool-val">true</span>)) => Index::Indexed(n, e), |
| <span class="prelude-val">Some</span>((n, <span class="bool-val">false</span>)) => Index::Name(n, e), |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>usable_capacity(cap: usize) -> usize { |
| cap - cap / <span class="number">4 |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_raw_capacity(n: usize) -> usize { |
| n + n / <span class="number">3 |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>desired_pos(mask: usize, hash: HashValue) -> usize { |
| (hash.<span class="number">0 </span>& mask) <span class="kw">as </span>usize |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>probe_distance(mask: usize, hash: HashValue, current: usize) -> usize { |
| current.wrapping_sub(desired_pos(mask, hash)) & mask <span class="kw">as </span>usize |
| } |
| |
| <span class="kw">fn </span>hash_header(header: <span class="kw-2">&</span>Header) -> HashValue { |
| <span class="kw">const </span>MASK: u64 = (MAX_SIZE <span class="kw">as </span>u64) - <span class="number">1</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>h = FnvHasher::default(); |
| header.name().hash(<span class="kw-2">&mut </span>h); |
| HashValue((h.finish() & MASK) <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Checks the static table for the header. If found, returns the index and a |
| /// boolean representing if the value matched as well. |
| </span><span class="kw">fn </span>index_static(header: <span class="kw-2">&</span>Header) -> <span class="prelude-ty">Option</span><(usize, bool)> { |
| <span class="kw">match </span><span class="kw-2">*</span>header { |
| Header::Field { |
| <span class="kw-2">ref </span>name, |
| <span class="kw-2">ref </span>value, |
| } => <span class="kw">match </span><span class="kw-2">*</span>name { |
| header::ACCEPT_CHARSET => <span class="prelude-val">Some</span>((<span class="number">15</span>, <span class="bool-val">false</span>)), |
| header::ACCEPT_ENCODING => { |
| <span class="kw">if </span>value == <span class="string">"gzip, deflate" </span>{ |
| <span class="prelude-val">Some</span>((<span class="number">16</span>, <span class="bool-val">true</span>)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>((<span class="number">16</span>, <span class="bool-val">false</span>)) |
| } |
| } |
| header::ACCEPT_LANGUAGE => <span class="prelude-val">Some</span>((<span class="number">17</span>, <span class="bool-val">false</span>)), |
| header::ACCEPT_RANGES => <span class="prelude-val">Some</span>((<span class="number">18</span>, <span class="bool-val">false</span>)), |
| header::ACCEPT => <span class="prelude-val">Some</span>((<span class="number">19</span>, <span class="bool-val">false</span>)), |
| header::ACCESS_CONTROL_ALLOW_ORIGIN => <span class="prelude-val">Some</span>((<span class="number">20</span>, <span class="bool-val">false</span>)), |
| header::AGE => <span class="prelude-val">Some</span>((<span class="number">21</span>, <span class="bool-val">false</span>)), |
| header::ALLOW => <span class="prelude-val">Some</span>((<span class="number">22</span>, <span class="bool-val">false</span>)), |
| header::AUTHORIZATION => <span class="prelude-val">Some</span>((<span class="number">23</span>, <span class="bool-val">false</span>)), |
| header::CACHE_CONTROL => <span class="prelude-val">Some</span>((<span class="number">24</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_DISPOSITION => <span class="prelude-val">Some</span>((<span class="number">25</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_ENCODING => <span class="prelude-val">Some</span>((<span class="number">26</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_LANGUAGE => <span class="prelude-val">Some</span>((<span class="number">27</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_LENGTH => <span class="prelude-val">Some</span>((<span class="number">28</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_LOCATION => <span class="prelude-val">Some</span>((<span class="number">29</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_RANGE => <span class="prelude-val">Some</span>((<span class="number">30</span>, <span class="bool-val">false</span>)), |
| header::CONTENT_TYPE => <span class="prelude-val">Some</span>((<span class="number">31</span>, <span class="bool-val">false</span>)), |
| header::COOKIE => <span class="prelude-val">Some</span>((<span class="number">32</span>, <span class="bool-val">false</span>)), |
| header::DATE => <span class="prelude-val">Some</span>((<span class="number">33</span>, <span class="bool-val">false</span>)), |
| header::ETAG => <span class="prelude-val">Some</span>((<span class="number">34</span>, <span class="bool-val">false</span>)), |
| header::EXPECT => <span class="prelude-val">Some</span>((<span class="number">35</span>, <span class="bool-val">false</span>)), |
| header::EXPIRES => <span class="prelude-val">Some</span>((<span class="number">36</span>, <span class="bool-val">false</span>)), |
| header::FROM => <span class="prelude-val">Some</span>((<span class="number">37</span>, <span class="bool-val">false</span>)), |
| header::HOST => <span class="prelude-val">Some</span>((<span class="number">38</span>, <span class="bool-val">false</span>)), |
| header::IF_MATCH => <span class="prelude-val">Some</span>((<span class="number">39</span>, <span class="bool-val">false</span>)), |
| header::IF_MODIFIED_SINCE => <span class="prelude-val">Some</span>((<span class="number">40</span>, <span class="bool-val">false</span>)), |
| header::IF_NONE_MATCH => <span class="prelude-val">Some</span>((<span class="number">41</span>, <span class="bool-val">false</span>)), |
| header::IF_RANGE => <span class="prelude-val">Some</span>((<span class="number">42</span>, <span class="bool-val">false</span>)), |
| header::IF_UNMODIFIED_SINCE => <span class="prelude-val">Some</span>((<span class="number">43</span>, <span class="bool-val">false</span>)), |
| header::LAST_MODIFIED => <span class="prelude-val">Some</span>((<span class="number">44</span>, <span class="bool-val">false</span>)), |
| header::LINK => <span class="prelude-val">Some</span>((<span class="number">45</span>, <span class="bool-val">false</span>)), |
| header::LOCATION => <span class="prelude-val">Some</span>((<span class="number">46</span>, <span class="bool-val">false</span>)), |
| header::MAX_FORWARDS => <span class="prelude-val">Some</span>((<span class="number">47</span>, <span class="bool-val">false</span>)), |
| header::PROXY_AUTHENTICATE => <span class="prelude-val">Some</span>((<span class="number">48</span>, <span class="bool-val">false</span>)), |
| header::PROXY_AUTHORIZATION => <span class="prelude-val">Some</span>((<span class="number">49</span>, <span class="bool-val">false</span>)), |
| header::RANGE => <span class="prelude-val">Some</span>((<span class="number">50</span>, <span class="bool-val">false</span>)), |
| header::REFERER => <span class="prelude-val">Some</span>((<span class="number">51</span>, <span class="bool-val">false</span>)), |
| header::REFRESH => <span class="prelude-val">Some</span>((<span class="number">52</span>, <span class="bool-val">false</span>)), |
| header::RETRY_AFTER => <span class="prelude-val">Some</span>((<span class="number">53</span>, <span class="bool-val">false</span>)), |
| header::SERVER => <span class="prelude-val">Some</span>((<span class="number">54</span>, <span class="bool-val">false</span>)), |
| header::SET_COOKIE => <span class="prelude-val">Some</span>((<span class="number">55</span>, <span class="bool-val">false</span>)), |
| header::STRICT_TRANSPORT_SECURITY => <span class="prelude-val">Some</span>((<span class="number">56</span>, <span class="bool-val">false</span>)), |
| header::TRANSFER_ENCODING => <span class="prelude-val">Some</span>((<span class="number">57</span>, <span class="bool-val">false</span>)), |
| header::USER_AGENT => <span class="prelude-val">Some</span>((<span class="number">58</span>, <span class="bool-val">false</span>)), |
| header::VARY => <span class="prelude-val">Some</span>((<span class="number">59</span>, <span class="bool-val">false</span>)), |
| header::VIA => <span class="prelude-val">Some</span>((<span class="number">60</span>, <span class="bool-val">false</span>)), |
| header::WWW_AUTHENTICATE => <span class="prelude-val">Some</span>((<span class="number">61</span>, <span class="bool-val">false</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| }, |
| Header::Authority(<span class="kw">_</span>) => <span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="bool-val">false</span>)), |
| Header::Method(<span class="kw-2">ref </span>v) => <span class="kw">match </span><span class="kw-2">*</span>v { |
| Method::GET => <span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="bool-val">true</span>)), |
| Method::POST => <span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="bool-val">true</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="bool-val">false</span>)), |
| }, |
| Header::Scheme(<span class="kw-2">ref </span>v) => <span class="kw">match </span><span class="kw-2">&**</span>v { |
| <span class="string">"http" </span>=> <span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="bool-val">true</span>)), |
| <span class="string">"https" </span>=> <span class="prelude-val">Some</span>((<span class="number">7</span>, <span class="bool-val">true</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="bool-val">false</span>)), |
| }, |
| Header::Path(<span class="kw-2">ref </span>v) => <span class="kw">match </span><span class="kw-2">&**</span>v { |
| <span class="string">"/" </span>=> <span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="bool-val">true</span>)), |
| <span class="string">"/index.html" </span>=> <span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="bool-val">true</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="bool-val">false</span>)), |
| }, |
| Header::Protocol(..) => <span class="prelude-val">None</span>, |
| Header::Status(<span class="kw-2">ref </span>v) => <span class="kw">match </span>u16::from(<span class="kw-2">*</span>v) { |
| <span class="number">200 </span>=> <span class="prelude-val">Some</span>((<span class="number">8</span>, <span class="bool-val">true</span>)), |
| <span class="number">204 </span>=> <span class="prelude-val">Some</span>((<span class="number">9</span>, <span class="bool-val">true</span>)), |
| <span class="number">206 </span>=> <span class="prelude-val">Some</span>((<span class="number">10</span>, <span class="bool-val">true</span>)), |
| <span class="number">304 </span>=> <span class="prelude-val">Some</span>((<span class="number">11</span>, <span class="bool-val">true</span>)), |
| <span class="number">400 </span>=> <span class="prelude-val">Some</span>((<span class="number">12</span>, <span class="bool-val">true</span>)), |
| <span class="number">404 </span>=> <span class="prelude-val">Some</span>((<span class="number">13</span>, <span class="bool-val">true</span>)), |
| <span class="number">500 </span>=> <span class="prelude-val">Some</span>((<span class="number">14</span>, <span class="bool-val">true</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Some</span>((<span class="number">8</span>, <span class="bool-val">false</span>)), |
| }, |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="h2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |