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all FX functions are now safe wrapped and I added the crate to the docs also it is added to the prelude

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ZennDev1337 2023-10-04 14:55:54 +02:00
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<!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 `C:\Users\zenn\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hash32-0.2.1\src\fnv.rs`."><title>fnv.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-cb6f1f67f1bcd037.css" id="mainThemeStyle"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="hash32" data-themes="" data-resource-suffix="" data-rustdoc-version="1.73.0-nightly (8131b9774 2023-08-02)" data-channel="nightly" data-search-js="search-6dfdfced5eff6596.js" data-settings-js="settings-de11bff964e9d4e5.js" data-settings-css="settings-8c76f75bfb6bd192.css" data-theme-light-css="light-6d2c9675f3d09c26.css" data-theme-dark-css="dark-45ceb8f2e522f4d1.css" data-theme-ayu-css="ayu-fd19013d6ce078bf.css" ><script src="../../static.files/storage-db41da1a38ea3cb8.js"></script><script defer src="../../static.files/src-script-3280b574d94e47b4.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-0795b7d26be81095.js"></script><noscript><link rel="stylesheet" media="(prefers-color-scheme:light)" href="../../static.files/light-6d2c9675f3d09c26.css"><link rel="stylesheet" media="(prefers-color-scheme:dark)" href="../../static.files/dark-45ceb8f2e522f4d1.css"><link rel="stylesheet" href="../../static.files/noscript-cffde32267a19fd6.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../hash32/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="kw">const </span>BASIS: u32 = <span class="number">0x811c9dc5</span>;
<span class="kw">const </span>PRIME: u32 = <span class="number">0x1000193</span>;
<span class="doccomment">/// 32-bit Fowler-Noll-Vo hasher
</span><span class="kw">pub struct </span>Hasher {
state: u32,
}
<span class="kw">impl </span>Default <span class="kw">for </span>Hasher {
<span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
Hasher { state: BASIS }
}
}
<span class="kw">impl </span>::Hasher <span class="kw">for </span>Hasher {
<span class="attr">#[inline]
</span><span class="kw">fn </span>finish(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<span class="self">self</span>.state
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8]) {
<span class="kw">for </span>byte <span class="kw">in </span>bytes {
<span class="self">self</span>.state ^= u32::from(<span class="kw-2">*</span>byte);
<span class="self">self</span>.state = <span class="self">self</span>.state.wrapping_mul(PRIME);
}
}
}
</code></pre></div></section></main></body></html>

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</pre></div><pre class="rust"><code><span class="doccomment">//! 32-bit hashing machinery
//!
//! # Why?
//!
//! Because 32-bit architectures are a thing (e.g. ARM Cortex-M) and you don&#39;t want your hashing
//! function to pull in a bunch of slow 64-bit compiler intrinsics (software implementations of
//! 64-bit operations).
//!
//! # Relationship to `core::hash`
//!
//! This crate exposes the same interfaces you&#39;ll find in [`core::hash`]: `Hash`, `Hasher`,
//! `BuildHasher` and `BuildHasherDefault`. The main difference is that `hash32::Hasher::finish`
//! returns a `u32` instead of `u64`, and the contract of `hash32::Hasher` forbids the implementer
//! from performing 64-bit (or 128-bit) operations while computing the hash.
//!
//! [`core::hash`]: https://doc.rust-lang.org/std/hash/index.html
//!
//! # `#[derive(Hash32)]`
//!
//! The easiest way to implement `hash32::Hash` for a `struct` is to use the `#[derive(Hash32)]`.
//!
//! Note that you need to *explicitly* depend on both `hash32` *and* `hash32_derive`; both crates
//! must appear in your `Cargo.toml`.
//!
//! ``` ignore
//! use hash32_derive::Hash32;
//!
//! #[derive(Hash32)]
//! struct Ipv4Addr([u8; 4]);
//!
//! # fn main() {}
//!
//! ```
//! # Hashers
//!
//! This crate provides implementations of the following 32-bit hashing algorithms:
//!
//! - [Fowler-Noll-Vo](struct.FnvHasher.html)
//! - [MurmurHash3](struct.Murmur3Hasher.html)
//!
//! # MSRV
//!
//! This crate is guaranteed to compile on latest stable Rust. It *might* compile on older
//! versions but that may change in any new patch release.
//!
//! # Future
//!
//! In the future we&#39;d like to deprecate this crate in favor of making `core::hash::Hasher` generic
//! over the size of the computed hash. Below is shown the planned change (but it doesn&#39;t work due
//! to limitations in the `associated_type_defaults` feature):
//!
//! ``` ignore
//! #![feature(associated_type_defaults)]
//!
//! trait Hasher {
//! type Hash = u64; // default type for backwards compatibility
//!
//! fn finish(&amp;self) -&gt; Self::Hash; // changed
//! fn write(&amp;mut self, bytes: &amp;[u8]);
//! }
//! ```
//!
//! With this change a single `#[derive(Hash)]` would enough to make a type hashable with 32-bit and
//! 64-bit hashers.
</span><span class="attr">#![deny(missing_docs)]
#![deny(warnings)]
#![no_std]
</span><span class="kw">extern crate </span>byteorder;
<span class="kw">use </span>core::marker::PhantomData;
<span class="kw">use </span>core::{mem, slice, fmt};
<span class="kw">pub use </span>fnv::Hasher <span class="kw">as </span>FnvHasher;
<span class="kw">pub use </span>murmur3::Hasher <span class="kw">as </span>Murmur3Hasher;
<span class="kw">mod </span>fnv;
<span class="kw">mod </span>murmur3;
<span class="doccomment">/// See [`core::hash::BuildHasherDefault`][0] for details
///
/// [0]: https://doc.rust-lang.org/core/hash/struct.BuildHasherDefault.html
</span><span class="kw">pub struct </span>BuildHasherDefault&lt;H&gt;
{
_marker: PhantomData&lt;H&gt;,
}
<span class="kw">impl</span>&lt;H&gt; Default <span class="kw">for </span>BuildHasherDefault&lt;H&gt;
<span class="kw">where
</span>H: Default + Hasher,
{
<span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
BuildHasherDefault {
_marker: PhantomData,
}
}
}
<span class="kw">impl</span>&lt;H&gt; Clone <span class="kw">for </span>BuildHasherDefault&lt;H&gt;
<span class="kw">where
</span>H: Default + Hasher,
{
<span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
BuildHasherDefault::default()
}
}
<span class="kw">impl</span>&lt;H&gt; PartialEq <span class="kw">for </span>BuildHasherDefault&lt;H&gt;
<span class="kw">where
</span>H: Default + Hasher,
{
<span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, _other: <span class="kw-2">&amp;</span>BuildHasherDefault&lt;H&gt;) -&gt; bool {
<span class="bool-val">true
</span>}
}
<span class="kw">impl</span>&lt;H: Default + Hasher&gt; Eq <span class="kw">for </span>BuildHasherDefault&lt;H&gt; {}
<span class="kw">impl</span>&lt;H: Default + Hasher&gt; fmt::Debug <span class="kw">for </span>BuildHasherDefault&lt;H&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
f.pad(<span class="string">&quot;BuildHasherDefault&quot;</span>)
}
}
<span class="kw">impl</span>&lt;H&gt; BuildHasherDefault&lt;H&gt;
{
<span class="doccomment">/// `const` constructor
</span><span class="kw">pub const fn </span>new() -&gt; <span class="self">Self </span>{
BuildHasherDefault {
_marker: PhantomData,
}
}
}
<span class="kw">impl</span>&lt;H&gt; BuildHasher <span class="kw">for </span>BuildHasherDefault&lt;H&gt;
<span class="kw">where
</span>H: Default + Hasher,
{
<span class="kw">type </span>Hasher = H;
<span class="kw">fn </span>build_hasher(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Hasher {
H::default()
}
}
<span class="doccomment">/// See [`core::hash::BuildHasher`][0] for details
///
/// [0]: https://doc.rust-lang.org/core/hash/trait.BuildHasher.html
</span><span class="kw">pub trait </span>BuildHasher {
<span class="doccomment">/// See [`core::hash::BuildHasher::Hasher`][0]
///
/// [0]: https://doc.rust-lang.org/std/hash/trait.BuildHasher.html#associatedtype.Hasher
</span><span class="kw">type </span>Hasher: Hasher;
<span class="doccomment">/// See [`core::hash::BuildHasher.build_hasher`][0]
///
/// [0]: https://doc.rust-lang.org/std/hash/trait.BuildHasher.html#tymethod.build_hasher
</span><span class="kw">fn </span>build_hasher(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Hasher;
}
<span class="doccomment">/// See [`core::hash::Hasher`][0] for details
///
/// [0]: https://doc.rust-lang.org/core/hash/trait.Hasher.html
///
/// # Contract
///
/// Implementers of this trait must *not* perform any 64-bit (or 128-bit) operation while computing
/// the hash.
</span><span class="kw">pub trait </span>Hasher {
<span class="doccomment">/// See [`core::hash::Hasher.finish`][0]
///
/// [0]: https://doc.rust-lang.org/std/hash/trait.Hasher.html#tymethod.finish
</span><span class="kw">fn </span>finish(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32;
<span class="doccomment">/// See [`core::hash::Hasher.write`][0]
///
/// [0]: https://doc.rust-lang.org/std/hash/trait.Hasher.html#tymethod.write
</span><span class="kw">fn </span>write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8]);
}
<span class="doccomment">/// See [`core::hash::Hash`][0] for details
///
/// [0]: https://doc.rust-lang.org/core/hash/trait.Hash.html
</span><span class="kw">pub trait </span>Hash {
<span class="doccomment">/// Feeds this value into the given `Hasher`.
</span><span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher;
<span class="doccomment">/// Feeds a slice of this type into the given `Hasher`.
</span><span class="kw">fn </span>hash_slice&lt;H&gt;(data: <span class="kw-2">&amp;</span>[<span class="self">Self</span>], state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
<span class="self">Self</span>: Sized,
{
<span class="kw">for </span>piece <span class="kw">in </span>data {
piece.hash(state);
}
}
}
<span class="macro">macro_rules! </span>int {
(<span class="macro-nonterminal">$ty</span>:ident) =&gt; {
<span class="kw">impl </span>Hash <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
<span class="kw">unsafe </span>{ state.write(<span class="kw-2">&amp;</span>mem::transmute::&lt;<span class="macro-nonterminal">$ty</span>, [u8; mem::size_of::&lt;<span class="macro-nonterminal">$ty</span>&gt;()]&gt;(<span class="kw-2">*</span><span class="self">self</span>)) }
}
<span class="kw">fn </span>hash_slice&lt;H&gt;(data: <span class="kw-2">&amp;</span>[<span class="self">Self</span>], state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
<span class="kw">let </span>newlen = data.len() * mem::size_of::&lt;<span class="macro-nonterminal">$ty</span>&gt;();
<span class="kw">let </span>ptr = data.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>u8;
<span class="kw">unsafe </span>{ state.write(slice::from_raw_parts(ptr, newlen)) }
}
}
};
}
<span class="macro">int!</span>(i16);
<span class="macro">int!</span>(i32);
<span class="macro">int!</span>(i64);
<span class="macro">int!</span>(i8);
<span class="macro">int!</span>(isize);
<span class="macro">int!</span>(u16);
<span class="macro">int!</span>(u32);
<span class="macro">int!</span>(u64);
<span class="macro">int!</span>(u8);
<span class="macro">int!</span>(usize);
<span class="kw">impl </span>Hash <span class="kw">for </span>bool {
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8).hash(state)
}
}
<span class="kw">impl </span>Hash <span class="kw">for </span>char {
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u32).hash(state)
}
}
<span class="kw">impl </span>Hash <span class="kw">for </span>str {
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
state.write(<span class="self">self</span>.as_bytes());
state.write(<span class="kw-2">&amp;</span>[<span class="number">0xff</span>]);
}
}
<span class="kw">impl</span>&lt;T&gt; Hash <span class="kw">for </span>[T]
<span class="kw">where
</span>T: Hash,
{
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
<span class="self">self</span>.len().hash(state);
T::hash_slice(<span class="self">self</span>, state);
}
}
<span class="macro">macro_rules! </span>array {
($(<span class="macro-nonterminal">$n</span>:expr),+) =&gt; {
$(
<span class="kw">impl</span>&lt;T&gt; Hash <span class="kw">for </span>[T; <span class="macro-nonterminal">$n</span>]
<span class="kw">where
</span>T: Hash,
{
<span class="kw">fn </span>hash&lt;H&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H)
<span class="kw">where
</span>H: Hasher,
{
Hash::hash(<span class="kw-2">&amp;</span><span class="self">self</span>[..], state)
}
}
)+
};
}
<span class="macro">array!</span>(
<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">15</span>, <span class="number">16</span>, <span class="number">17</span>, <span class="number">18</span>, <span class="number">19</span>, <span class="number">20</span>, <span class="number">21</span>, <span class="number">22</span>, <span class="number">23</span>, <span class="number">24</span>, <span class="number">25</span>,
<span class="number">26</span>, <span class="number">27</span>, <span class="number">28</span>, <span class="number">29</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">32
</span>);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="question-mark">?</span>Sized + Hash&gt; Hash <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T {
<span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
(<span class="kw-2">**</span><span class="self">self</span>).hash(state);
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: <span class="question-mark">?</span>Sized + Hash&gt; Hash <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>T {
<span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
(<span class="kw-2">**</span><span class="self">self</span>).hash(state);
}
}
<span class="kw">impl </span>Hash <span class="kw">for </span>() {
<span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, _state: <span class="kw-2">&amp;mut </span>H) {}
}
<span class="macro">macro_rules! </span>tuple {
( $(<span class="macro-nonterminal">$name</span>:ident)+) =&gt; (
<span class="kw">impl</span>&lt;$(<span class="macro-nonterminal">$name</span>: Hash),<span class="kw-2">*</span>&gt; Hash <span class="kw">for </span>($(<span class="macro-nonterminal">$name</span>,)<span class="kw-2">*</span>)
<span class="kw">where
</span><span class="macro">last_type!</span>($(<span class="macro-nonterminal">$name</span>,)+): <span class="question-mark">?</span>Sized
{
<span class="attr">#[allow(non_snake_case)]
</span><span class="kw">fn </span>hash&lt;S: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>S) {
<span class="kw">let </span>($(<span class="kw-2">ref </span><span class="macro-nonterminal">$name</span>,)<span class="kw-2">*</span>) = <span class="kw-2">*</span><span class="self">self</span>;
$(<span class="macro-nonterminal">$name</span>.hash(state);)*
}
}
);
}
<span class="macro">macro_rules! </span>last_type {
(<span class="macro-nonterminal">$a</span>:ident,) =&gt; { <span class="macro-nonterminal">$a </span>};
(<span class="macro-nonterminal">$a</span>:ident, $(<span class="macro-nonterminal">$rest_a</span>:ident,)+) =&gt; { <span class="macro">last_type!</span>($(<span class="macro-nonterminal">$rest_a</span>,)+) };
}
<span class="macro">tuple! </span>{ A }
<span class="macro">tuple! </span>{ A B }
<span class="macro">tuple! </span>{ A B C }
<span class="macro">tuple! </span>{ A B C D }
<span class="macro">tuple! </span>{ A B C D E }
<span class="macro">tuple! </span>{ A B C D E F }
<span class="macro">tuple! </span>{ A B C D E F G }
<span class="macro">tuple! </span>{ A B C D E F G H }
<span class="macro">tuple! </span>{ A B C D E F G H I }
<span class="macro">tuple! </span>{ A B C D E F G H I J }
<span class="macro">tuple! </span>{ A B C D E F G H I J K }
<span class="macro">tuple! </span>{ A B C D E F G H I J K L }
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>test {
<span class="kw">use super</span>::{FnvHasher, Hash, Hasher};
<span class="attr">#[test]
</span><span class="kw">fn </span>hashes_tuples() {
<span class="kw">let </span><span class="kw-2">mut </span>h = FnvHasher::default();
().hash(<span class="kw-2">&amp;mut </span>h);
(<span class="number">1_usize</span>,).hash(<span class="kw-2">&amp;mut </span>h);
(<span class="number">1_u8</span>, <span class="number">2_i8</span>).hash(<span class="kw-2">&amp;mut </span>h);
(<span class="number">1_u16</span>, <span class="number">2_i16</span>, <span class="number">3_u32</span>).hash(<span class="kw-2">&amp;mut </span>h);
(<span class="number">1_i32</span>, <span class="number">2_u64</span>, <span class="number">3_i64</span>, <span class="bool-val">true</span>).hash(<span class="kw-2">&amp;mut </span>h);
(<span class="number">1_isize</span>, <span class="string">&#39;a&#39;</span>, <span class="string">&quot;abc&quot;</span>, [<span class="number">1u32</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>], <span class="bool-val">false</span>).hash(<span class="kw-2">&amp;mut </span>h);
h.finish();
}
}
</code></pre></div></section></main></body></html>

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</pre></div><pre class="rust"><code><span class="kw">use </span>core::{mem, slice};
<span class="kw">use </span>byteorder::{ByteOrder, LE};
<span class="doccomment">/// 32-bit MurmurHash3 hasher
</span><span class="kw">pub struct </span>Hasher {
buf: Buffer,
index: Index,
processed: u32,
state: State,
}
<span class="kw">struct </span>State(u32);
<span class="attr">#[derive(Clone, Copy)]
#[repr(align(<span class="number">4</span>))]
</span><span class="kw">struct </span>Buffer {
bytes: [u8; <span class="number">4</span>],
}
<span class="attr">#[derive(Clone, Copy, PartialEq)]
</span><span class="kw">enum </span>Index {
_0,
_1,
_2,
_3,
}
<span class="kw">impl </span>Index {
<span class="kw">fn </span>usize(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Index::_0 =&gt; <span class="number">0</span>,
Index::_1 =&gt; <span class="number">1</span>,
Index::_2 =&gt; <span class="number">2</span>,
Index::_3 =&gt; <span class="number">3</span>,
}
}
}
<span class="kw">impl </span>From&lt;usize&gt; <span class="kw">for </span>Index {
<span class="kw">fn </span>from(x: usize) -&gt; <span class="self">Self </span>{
<span class="kw">match </span>x % <span class="number">4 </span>{
<span class="number">0 </span>=&gt; Index::_0,
<span class="number">1 </span>=&gt; Index::_1,
<span class="number">2 </span>=&gt; Index::_2,
<span class="number">3 </span>=&gt; Index::_3,
<span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(),
}
}
}
<span class="kw">impl </span>Hasher {
<span class="kw">fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8]) {
<span class="kw">let </span>start = <span class="self">self</span>.index.usize();
<span class="kw">let </span>len = buf.len();
<span class="comment">// NOTE(unsafe) avoid calling `memcpy` on a 0-3 byte copy
// self.buf.bytes[start..start+len].copy_from(buf);
</span><span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..len {
<span class="kw">unsafe </span>{
<span class="kw-2">*</span><span class="self">self</span>.buf.bytes.get_unchecked_mut(start + i) = <span class="kw-2">*</span>buf.get_unchecked(i);
}
}
<span class="self">self</span>.index = Index::from(start + len);
}
}
<span class="kw">impl </span>Default <span class="kw">for </span>Hasher {
<span class="attr">#[allow(deprecated)]
</span><span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
Hasher {
buf: <span class="kw">unsafe </span>{ mem::uninitialized() },
index: Index::_0,
processed: <span class="number">0</span>,
state: State(<span class="number">0</span>),
}
}
}
<span class="kw">impl </span>::Hasher <span class="kw">for </span>Hasher {
<span class="kw">fn </span>finish(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<span class="comment">// tail
</span><span class="kw">let </span><span class="kw-2">mut </span>state = <span class="kw">match </span><span class="self">self</span>.index {
Index::_3 =&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>block = <span class="number">0</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">2</span>]) &lt;&lt; <span class="number">16</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">1</span>]) &lt;&lt; <span class="number">8</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">0</span>]);
<span class="self">self</span>.state.<span class="number">0 </span>^ pre_mix(block)
}
Index::_2 =&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>block = <span class="number">0</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">1</span>]) &lt;&lt; <span class="number">8</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">0</span>]);
<span class="self">self</span>.state.<span class="number">0 </span>^ pre_mix(block)
}
Index::_1 =&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>block = <span class="number">0</span>;
block ^= u32::from(<span class="self">self</span>.buf.bytes[<span class="number">0</span>]);
<span class="self">self</span>.state.<span class="number">0 </span>^ pre_mix(block)
}
Index::_0 =&gt; <span class="self">self</span>.state.<span class="number">0</span>,
};
<span class="comment">// finalization mix
</span>state ^= <span class="self">self</span>.processed;
state ^= state &gt;&gt; <span class="number">16</span>;
state = state.wrapping_mul(<span class="number">0x85ebca6b</span>);
state ^= state &gt;&gt; <span class="number">13</span>;
state = state.wrapping_mul(<span class="number">0xc2b2ae35</span>);
state ^= state &gt;&gt; <span class="number">16</span>;
state
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8]) {
<span class="kw">let </span>len = bytes.len();
<span class="self">self</span>.processed += len <span class="kw">as </span>u32;
<span class="kw">let </span>body = <span class="kw">if </span><span class="self">self</span>.index == Index::_0 {
bytes
} <span class="kw">else </span>{
<span class="kw">let </span>index = <span class="self">self</span>.index.usize();
<span class="kw">if </span>len + index &gt;= <span class="number">4 </span>{
<span class="comment">// we can complete a block using the data left in the buffer
// NOTE(unsafe) avoid panicking branch (`slice_index_len_fail`)
// let (head, body) = bytes.split_at(4 - index);
</span><span class="kw">let </span>mid = <span class="number">4 </span>- index;
<span class="kw">let </span>head = <span class="kw">unsafe </span>{ slice::from_raw_parts(bytes.as_ptr(), mid) };
<span class="kw">let </span>body = <span class="kw">unsafe </span>{
slice::from_raw_parts(bytes.as_ptr().offset(mid <span class="kw">as </span>isize), len - mid)
};
<span class="comment">// NOTE(unsafe) avoid calling `memcpy` on a 0-3 byte copy
// self.buf.bytes[index..].copy_from_slice(head);
</span><span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">4 </span>- index {
<span class="kw">unsafe </span>{
<span class="kw-2">*</span><span class="self">self</span>.buf.bytes.get_unchecked_mut(index + i) = <span class="kw-2">*</span>head.get_unchecked(i);
}
}
<span class="self">self</span>.index = Index::_0;
<span class="self">self</span>.state.process_block(<span class="kw-2">&amp;</span><span class="self">self</span>.buf.bytes);
body
} <span class="kw">else </span>{
bytes
}
};
<span class="kw">for </span>block <span class="kw">in </span>body.chunks(<span class="number">4</span>) {
<span class="kw">if </span>block.len() == <span class="number">4 </span>{
<span class="self">self</span>.state
.process_block(<span class="kw">unsafe </span>{ <span class="kw-2">&amp;*</span>(block.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_</span>) });
} <span class="kw">else </span>{
<span class="self">self</span>.push(block);
}
}
<span class="comment">// XXX is this faster?
// for block in body.exact_chunks(4) {
// self.state
// .process_block(unsafe { &amp;*(block.as_ptr() as *const _) });
// }
// let tail = body.split_at(body.len() / 4 * 4).1;
// self.push(tail);
</span>}
}
<span class="kw">const </span>C1: u32 = <span class="number">0xcc9e2d51</span>;
<span class="kw">const </span>C2: u32 = <span class="number">0x1b873593</span>;
<span class="kw">const </span>R1: u32 = <span class="number">15</span>;
<span class="kw">impl </span>State {
<span class="kw">fn </span>process_block(<span class="kw-2">&amp;mut </span><span class="self">self</span>, block: <span class="kw-2">&amp;</span>[u8; <span class="number">4</span>]) {
<span class="self">self</span>.<span class="number">0 </span>^= pre_mix(LE::read_u32(block));
<span class="self">self</span>.<span class="number">0 </span>= <span class="self">self</span>.<span class="number">0</span>.rotate_left(<span class="number">13</span>);
<span class="self">self</span>.<span class="number">0 </span>= <span class="number">5u32</span>.wrapping_mul(<span class="self">self</span>.<span class="number">0</span>).wrapping_add(<span class="number">0xe6546b64</span>);
}
}
<span class="kw">fn </span>pre_mix(<span class="kw-2">mut </span>block: u32) -&gt; u32 {
block = block.wrapping_mul(C1);
block = block.rotate_left(R1);
block = block.wrapping_mul(C2);
block
}
</code></pre></div></section></main></body></html>