288 lines
27 KiB
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288 lines
27 KiB
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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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/adler2-2.0.1/src/lib.rs`."><title>lib.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="adler2" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.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"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">adler2/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Adler-32 checksum implementation.
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<a href=#2 id=2 data-nosnippet>2</a>//!
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<a href=#3 id=3 data-nosnippet>3</a>//! This implementation features:
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<a href=#4 id=4 data-nosnippet>4</a>//!
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<a href=#5 id=5 data-nosnippet>5</a>//! - Permissively licensed (0BSD) clean-room implementation.
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<a href=#6 id=6 data-nosnippet>6</a>//! - Zero dependencies.
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<a href=#7 id=7 data-nosnippet>7</a>//! - Zero `unsafe`.
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<a href=#8 id=8 data-nosnippet>8</a>//! - Decent performance (3-4 GB/s).
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<a href=#9 id=9 data-nosnippet>9</a>//! - `#![no_std]` support (with `default-features = false`).
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<a href=#10 id=10 data-nosnippet>10</a>
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<a href=#11 id=11 data-nosnippet>11</a></span><span class="attr">#![doc(html_root_url = <span class="string">"https://docs.rs/adler2/2.0.0"</span>)]
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<a href=#12 id=12 data-nosnippet>12</a></span><span class="comment">// Deny a few warnings in doctests, since rustdoc `allow`s many warnings by default
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<a href=#13 id=13 data-nosnippet>13</a></span><span class="attr">#![doc(test(attr(deny(unused_imports, unused_must_use))))]
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<a href=#14 id=14 data-nosnippet>14</a>#![cfg_attr(docsrs, feature(doc_cfg))]
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<a href=#15 id=15 data-nosnippet>15</a>#![warn(missing_debug_implementations)]
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<a href=#16 id=16 data-nosnippet>16</a>#![forbid(unsafe_code)]
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<a href=#17 id=17 data-nosnippet>17</a>#![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)]
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<a href=#18 id=18 data-nosnippet>18</a>
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<a href=#19 id=19 data-nosnippet>19</a>#[cfg(not(feature = <span class="string">"std"</span>))]
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<a href=#20 id=20 data-nosnippet>20</a></span><span class="kw">extern crate </span>core <span class="kw">as </span>std;
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<a href=#21 id=21 data-nosnippet>21</a>
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<a href=#22 id=22 data-nosnippet>22</a><span class="kw">mod </span>algo;
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<a href=#23 id=23 data-nosnippet>23</a>
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<a href=#24 id=24 data-nosnippet>24</a><span class="kw">use </span>std::hash::Hasher;
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<a href=#25 id=25 data-nosnippet>25</a>
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<a href=#26 id=26 data-nosnippet>26</a><span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
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<a href=#27 id=27 data-nosnippet>27</a></span><span class="kw">use </span>std::io::{<span class="self">self</span>, BufRead};
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<a href=#28 id=28 data-nosnippet>28</a>
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<a href=#29 id=29 data-nosnippet>29</a><span class="doccomment">/// Adler-32 checksum calculator.
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<a href=#30 id=30 data-nosnippet>30</a>///
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<a href=#31 id=31 data-nosnippet>31</a>/// An instance of this type is equivalent to an Adler-32 checksum: It can be created in the default
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<a href=#32 id=32 data-nosnippet>32</a>/// state via [`new`] (or the provided `Default` impl), or from a precalculated checksum via
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<a href=#33 id=33 data-nosnippet>33</a>/// [`from_checksum`], and the currently stored checksum can be fetched via [`checksum`].
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<a href=#34 id=34 data-nosnippet>34</a>///
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<a href=#35 id=35 data-nosnippet>35</a>/// This type also implements `Hasher`, which makes it easy to calculate Adler-32 checksums of any
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<a href=#36 id=36 data-nosnippet>36</a>/// type that implements or derives `Hash`. This also allows using Adler-32 in a `HashMap`, although
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<a href=#37 id=37 data-nosnippet>37</a>/// that is not recommended (while every checksum is a hash function, they are not necessarily a
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<a href=#38 id=38 data-nosnippet>38</a>/// good one).
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<a href=#39 id=39 data-nosnippet>39</a>///
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<a href=#40 id=40 data-nosnippet>40</a>/// # Examples
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<a href=#41 id=41 data-nosnippet>41</a>///
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<a href=#42 id=42 data-nosnippet>42</a>/// Basic, piecewise checksum calculation:
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<a href=#43 id=43 data-nosnippet>43</a>///
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<a href=#44 id=44 data-nosnippet>44</a>/// ```
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<a href=#45 id=45 data-nosnippet>45</a>/// use adler2::Adler32;
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<a href=#46 id=46 data-nosnippet>46</a>///
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<a href=#47 id=47 data-nosnippet>47</a>/// let mut adler = Adler32::new();
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<a href=#48 id=48 data-nosnippet>48</a>///
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<a href=#49 id=49 data-nosnippet>49</a>/// adler.write_slice(&[0, 1, 2]);
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<a href=#50 id=50 data-nosnippet>50</a>/// adler.write_slice(&[3, 4, 5]);
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<a href=#51 id=51 data-nosnippet>51</a>///
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<a href=#52 id=52 data-nosnippet>52</a>/// assert_eq!(adler.checksum(), 0x00290010);
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<a href=#53 id=53 data-nosnippet>53</a>/// ```
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<a href=#54 id=54 data-nosnippet>54</a>///
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<a href=#55 id=55 data-nosnippet>55</a>/// Using `Hash` to process structures:
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<a href=#56 id=56 data-nosnippet>56</a>///
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<a href=#57 id=57 data-nosnippet>57</a>/// ```
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<a href=#58 id=58 data-nosnippet>58</a>/// use std::hash::Hash;
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<a href=#59 id=59 data-nosnippet>59</a>/// use adler2::Adler32;
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<a href=#60 id=60 data-nosnippet>60</a>///
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<a href=#61 id=61 data-nosnippet>61</a>/// #[derive(Hash)]
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<a href=#62 id=62 data-nosnippet>62</a>/// struct Data {
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<a href=#63 id=63 data-nosnippet>63</a>/// byte: u8,
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<a href=#64 id=64 data-nosnippet>64</a>/// word: u16,
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<a href=#65 id=65 data-nosnippet>65</a>/// big: u64,
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<a href=#66 id=66 data-nosnippet>66</a>/// }
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<a href=#67 id=67 data-nosnippet>67</a>///
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<a href=#68 id=68 data-nosnippet>68</a>/// let mut adler = Adler32::new();
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<a href=#69 id=69 data-nosnippet>69</a>///
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<a href=#70 id=70 data-nosnippet>70</a>/// let data = Data { byte: 0x1F, word: 0xABCD, big: !0 };
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<a href=#71 id=71 data-nosnippet>71</a>/// data.hash(&mut adler);
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<a href=#72 id=72 data-nosnippet>72</a>///
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<a href=#73 id=73 data-nosnippet>73</a>/// // hash value depends on architecture endianness
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<a href=#74 id=74 data-nosnippet>74</a>/// if cfg!(target_endian = "little") {
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<a href=#75 id=75 data-nosnippet>75</a>/// assert_eq!(adler.checksum(), 0x33410990);
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<a href=#76 id=76 data-nosnippet>76</a>/// }
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<a href=#77 id=77 data-nosnippet>77</a>/// if cfg!(target_endian = "big") {
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<a href=#78 id=78 data-nosnippet>78</a>/// assert_eq!(adler.checksum(), 0x331F0990);
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<a href=#79 id=79 data-nosnippet>79</a>/// }
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<a href=#80 id=80 data-nosnippet>80</a>///
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<a href=#81 id=81 data-nosnippet>81</a>/// ```
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<a href=#82 id=82 data-nosnippet>82</a>///
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<a href=#83 id=83 data-nosnippet>83</a>/// [`new`]: #method.new
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<a href=#84 id=84 data-nosnippet>84</a>/// [`from_checksum`]: #method.from_checksum
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<a href=#85 id=85 data-nosnippet>85</a>/// [`checksum`]: #method.checksum
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<a href=#86 id=86 data-nosnippet>86</a></span><span class="attr">#[derive(Debug, Copy, Clone)]
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<a href=#87 id=87 data-nosnippet>87</a></span><span class="kw">pub struct </span>Adler32 {
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<a href=#88 id=88 data-nosnippet>88</a> a: u16,
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<a href=#89 id=89 data-nosnippet>89</a> b: u16,
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<a href=#90 id=90 data-nosnippet>90</a>}
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<a href=#91 id=91 data-nosnippet>91</a>
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<a href=#92 id=92 data-nosnippet>92</a><span class="kw">impl </span>Adler32 {
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<a href=#93 id=93 data-nosnippet>93</a> <span class="doccomment">/// Creates a new Adler-32 instance with default state.
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<a href=#94 id=94 data-nosnippet>94</a> </span><span class="attr">#[inline]
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<a href=#95 id=95 data-nosnippet>95</a> </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{
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<a href=#96 id=96 data-nosnippet>96</a> <span class="self">Self</span>::default()
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<a href=#97 id=97 data-nosnippet>97</a> }
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<a href=#98 id=98 data-nosnippet>98</a>
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<a href=#99 id=99 data-nosnippet>99</a> <span class="doccomment">/// Creates an `Adler32` instance from a precomputed Adler-32 checksum.
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<a href=#100 id=100 data-nosnippet>100</a> ///
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<a href=#101 id=101 data-nosnippet>101</a> /// This allows resuming checksum calculation without having to keep the `Adler32` instance
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<a href=#102 id=102 data-nosnippet>102</a> /// around.
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<a href=#103 id=103 data-nosnippet>103</a> ///
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<a href=#104 id=104 data-nosnippet>104</a> /// # Example
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<a href=#105 id=105 data-nosnippet>105</a> ///
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<a href=#106 id=106 data-nosnippet>106</a> /// ```
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<a href=#107 id=107 data-nosnippet>107</a> /// # use adler2::Adler32;
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<a href=#108 id=108 data-nosnippet>108</a> /// let parts = [
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<a href=#109 id=109 data-nosnippet>109</a> /// "rust",
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<a href=#110 id=110 data-nosnippet>110</a> /// "acean",
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<a href=#111 id=111 data-nosnippet>111</a> /// ];
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<a href=#112 id=112 data-nosnippet>112</a> /// let whole = adler2::adler32_slice(b"rustacean");
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<a href=#113 id=113 data-nosnippet>113</a> ///
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<a href=#114 id=114 data-nosnippet>114</a> /// let mut sum = Adler32::new();
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<a href=#115 id=115 data-nosnippet>115</a> /// sum.write_slice(parts[0].as_bytes());
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<a href=#116 id=116 data-nosnippet>116</a> /// let partial = sum.checksum();
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<a href=#117 id=117 data-nosnippet>117</a> ///
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<a href=#118 id=118 data-nosnippet>118</a> /// // ...later
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<a href=#119 id=119 data-nosnippet>119</a> ///
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<a href=#120 id=120 data-nosnippet>120</a> /// let mut sum = Adler32::from_checksum(partial);
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<a href=#121 id=121 data-nosnippet>121</a> /// sum.write_slice(parts[1].as_bytes());
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<a href=#122 id=122 data-nosnippet>122</a> /// assert_eq!(sum.checksum(), whole);
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<a href=#123 id=123 data-nosnippet>123</a> /// ```
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<a href=#124 id=124 data-nosnippet>124</a> </span><span class="attr">#[inline]
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<a href=#125 id=125 data-nosnippet>125</a> </span><span class="kw">pub const fn </span>from_checksum(sum: u32) -> <span class="self">Self </span>{
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<a href=#126 id=126 data-nosnippet>126</a> Adler32 {
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<a href=#127 id=127 data-nosnippet>127</a> a: sum <span class="kw">as </span>u16,
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<a href=#128 id=128 data-nosnippet>128</a> b: (sum >> <span class="number">16</span>) <span class="kw">as </span>u16,
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<a href=#129 id=129 data-nosnippet>129</a> }
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<a href=#130 id=130 data-nosnippet>130</a> }
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<a href=#131 id=131 data-nosnippet>131</a>
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<a href=#132 id=132 data-nosnippet>132</a> <span class="doccomment">/// Returns the calculated checksum at this point in time.
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<a href=#133 id=133 data-nosnippet>133</a> </span><span class="attr">#[inline]
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<a href=#134 id=134 data-nosnippet>134</a> </span><span class="kw">pub fn </span>checksum(<span class="kw-2">&</span><span class="self">self</span>) -> u32 {
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<a href=#135 id=135 data-nosnippet>135</a> (u32::from(<span class="self">self</span>.b) << <span class="number">16</span>) | u32::from(<span class="self">self</span>.a)
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<a href=#136 id=136 data-nosnippet>136</a> }
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<a href=#137 id=137 data-nosnippet>137</a>
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<a href=#138 id=138 data-nosnippet>138</a> <span class="doccomment">/// Adds `bytes` to the checksum calculation.
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<a href=#139 id=139 data-nosnippet>139</a> ///
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<a href=#140 id=140 data-nosnippet>140</a> /// If efficiency matters, this should be called with Byte slices that contain at least a few
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<a href=#141 id=141 data-nosnippet>141</a> /// thousand Bytes.
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<a href=#142 id=142 data-nosnippet>142</a> </span><span class="kw">pub fn </span>write_slice(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8]) {
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<a href=#143 id=143 data-nosnippet>143</a> <span class="self">self</span>.compute(bytes);
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<a href=#144 id=144 data-nosnippet>144</a> }
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<a href=#145 id=145 data-nosnippet>145</a>}
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<a href=#146 id=146 data-nosnippet>146</a>
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<a href=#147 id=147 data-nosnippet>147</a><span class="kw">impl </span>Default <span class="kw">for </span>Adler32 {
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<a href=#148 id=148 data-nosnippet>148</a> <span class="attr">#[inline]
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<a href=#149 id=149 data-nosnippet>149</a> </span><span class="kw">fn </span>default() -> <span class="self">Self </span>{
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<a href=#150 id=150 data-nosnippet>150</a> Adler32 { a: <span class="number">1</span>, b: <span class="number">0 </span>}
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<a href=#151 id=151 data-nosnippet>151</a> }
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<a href=#152 id=152 data-nosnippet>152</a>}
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<a href=#153 id=153 data-nosnippet>153</a>
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<a href=#154 id=154 data-nosnippet>154</a><span class="kw">impl </span>Hasher <span class="kw">for </span>Adler32 {
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<a href=#155 id=155 data-nosnippet>155</a> <span class="attr">#[inline]
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<a href=#156 id=156 data-nosnippet>156</a> </span><span class="kw">fn </span>finish(<span class="kw-2">&</span><span class="self">self</span>) -> u64 {
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<a href=#157 id=157 data-nosnippet>157</a> u64::from(<span class="self">self</span>.checksum())
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<a href=#158 id=158 data-nosnippet>158</a> }
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<a href=#159 id=159 data-nosnippet>159</a>
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<a href=#160 id=160 data-nosnippet>160</a> <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8]) {
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<a href=#161 id=161 data-nosnippet>161</a> <span class="self">self</span>.write_slice(bytes);
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<a href=#162 id=162 data-nosnippet>162</a> }
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<a href=#163 id=163 data-nosnippet>163</a>}
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<a href=#164 id=164 data-nosnippet>164</a>
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<a href=#165 id=165 data-nosnippet>165</a><span class="doccomment">/// Calculates the Adler-32 checksum of a byte slice.
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<a href=#166 id=166 data-nosnippet>166</a>///
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<a href=#167 id=167 data-nosnippet>167</a>/// This is a convenience function around the [`Adler32`] type.
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<a href=#168 id=168 data-nosnippet>168</a>///
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<a href=#169 id=169 data-nosnippet>169</a>/// [`Adler32`]: struct.Adler32.html
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<a href=#170 id=170 data-nosnippet>170</a></span><span class="kw">pub fn </span>adler32_slice(data: <span class="kw-2">&</span>[u8]) -> u32 {
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<a href=#171 id=171 data-nosnippet>171</a> <span class="kw">let </span><span class="kw-2">mut </span>h = Adler32::new();
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<a href=#172 id=172 data-nosnippet>172</a> h.write_slice(data);
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<a href=#173 id=173 data-nosnippet>173</a> h.checksum()
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<a href=#174 id=174 data-nosnippet>174</a>}
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<a href=#175 id=175 data-nosnippet>175</a>
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<a href=#176 id=176 data-nosnippet>176</a><span class="doccomment">/// Calculates the Adler-32 checksum of a `BufRead`'s contents.
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<a href=#177 id=177 data-nosnippet>177</a>///
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<a href=#178 id=178 data-nosnippet>178</a>/// The passed `BufRead` implementor will be read until it reaches EOF (or until it reports an
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<a href=#179 id=179 data-nosnippet>179</a>/// error).
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<a href=#180 id=180 data-nosnippet>180</a>///
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<a href=#181 id=181 data-nosnippet>181</a>/// If you only have a `Read` implementor, you can wrap it in `std::io::BufReader` before calling
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<a href=#182 id=182 data-nosnippet>182</a>/// this function.
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<a href=#183 id=183 data-nosnippet>183</a>///
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<a href=#184 id=184 data-nosnippet>184</a>/// # Errors
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<a href=#185 id=185 data-nosnippet>185</a>///
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<a href=#186 id=186 data-nosnippet>186</a>/// Any error returned by the reader are bubbled up by this function.
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<a href=#187 id=187 data-nosnippet>187</a>///
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<a href=#188 id=188 data-nosnippet>188</a>/// # Examples
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<a href=#189 id=189 data-nosnippet>189</a>///
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<a href=#190 id=190 data-nosnippet>190</a>/// ```no_run
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<a href=#191 id=191 data-nosnippet>191</a>/// # fn run() -> Result<(), Box<dyn std::error::Error>> {
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<a href=#192 id=192 data-nosnippet>192</a>/// use adler2::adler32;
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<a href=#193 id=193 data-nosnippet>193</a>///
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<a href=#194 id=194 data-nosnippet>194</a>/// use std::fs::File;
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<a href=#195 id=195 data-nosnippet>195</a>/// use std::io::BufReader;
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<a href=#196 id=196 data-nosnippet>196</a>///
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<a href=#197 id=197 data-nosnippet>197</a>/// let file = File::open("input.txt")?;
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<a href=#198 id=198 data-nosnippet>198</a>/// let mut file = BufReader::new(file);
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<a href=#199 id=199 data-nosnippet>199</a>///
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<a href=#200 id=200 data-nosnippet>200</a>/// adler32(&mut file)?;
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<a href=#201 id=201 data-nosnippet>201</a>/// # Ok(()) }
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<a href=#202 id=202 data-nosnippet>202</a>/// # fn main() { run().unwrap() }
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<a href=#203 id=203 data-nosnippet>203</a>/// ```
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<a href=#204 id=204 data-nosnippet>204</a></span><span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
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<a href=#205 id=205 data-nosnippet>205</a>#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))]
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<a href=#206 id=206 data-nosnippet>206</a></span><span class="kw">pub fn </span>adler32<R: BufRead>(<span class="kw-2">mut </span>reader: R) -> io::Result<u32> {
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<a href=#207 id=207 data-nosnippet>207</a> <span class="kw">let </span><span class="kw-2">mut </span>h = Adler32::new();
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<a href=#208 id=208 data-nosnippet>208</a> <span class="kw">loop </span>{
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<a href=#209 id=209 data-nosnippet>209</a> <span class="kw">let </span>len = {
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<a href=#210 id=210 data-nosnippet>210</a> <span class="kw">let </span>buf = reader.fill_buf()<span class="question-mark">?</span>;
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<a href=#211 id=211 data-nosnippet>211</a> <span class="kw">if </span>buf.is_empty() {
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<a href=#212 id=212 data-nosnippet>212</a> <span class="kw">return </span><span class="prelude-val">Ok</span>(h.checksum());
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<a href=#213 id=213 data-nosnippet>213</a> }
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<a href=#214 id=214 data-nosnippet>214</a>
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<a href=#215 id=215 data-nosnippet>215</a> h.write_slice(buf);
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<a href=#216 id=216 data-nosnippet>216</a> buf.len()
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<a href=#217 id=217 data-nosnippet>217</a> };
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<a href=#218 id=218 data-nosnippet>218</a> reader.consume(len);
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<a href=#219 id=219 data-nosnippet>219</a> }
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<a href=#220 id=220 data-nosnippet>220</a>}
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<a href=#221 id=221 data-nosnippet>221</a>
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<a href=#222 id=222 data-nosnippet>222</a><span class="attr">#[cfg(test)]
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<a href=#223 id=223 data-nosnippet>223</a></span><span class="kw">mod </span>tests {
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<a href=#224 id=224 data-nosnippet>224</a> <span class="kw">use super</span>::<span class="kw-2">*</span>;
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<a href=#225 id=225 data-nosnippet>225</a>
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<a href=#226 id=226 data-nosnippet>226</a> <span class="attr">#[test]
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<a href=#227 id=227 data-nosnippet>227</a> </span><span class="kw">fn </span>zeroes() {
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<a href=#228 id=228 data-nosnippet>228</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[]), <span class="number">1</span>);
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<a href=#229 id=229 data-nosnippet>229</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0</span>]), <span class="number">1 </span>| <span class="number">1 </span><< <span class="number">16</span>);
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<a href=#230 id=230 data-nosnippet>230</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">0</span>]), <span class="number">1 </span>| <span class="number">2 </span><< <span class="number">16</span>);
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<a href=#231 id=231 data-nosnippet>231</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">100</span>]), <span class="number">0x00640001</span>);
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<a href=#232 id=232 data-nosnippet>232</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">1024</span>]), <span class="number">0x04000001</span>);
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<a href=#233 id=233 data-nosnippet>233</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">1024 </span>* <span class="number">1024</span>]), <span class="number">0x00f00001</span>);
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<a href=#234 id=234 data-nosnippet>234</a> }
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<a href=#235 id=235 data-nosnippet>235</a>
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<a href=#236 id=236 data-nosnippet>236</a> <span class="attr">#[test]
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<a href=#237 id=237 data-nosnippet>237</a> </span><span class="kw">fn </span>ones() {
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<a href=#238 id=238 data-nosnippet>238</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0xff</span>; <span class="number">1024</span>]), <span class="number">0x79a6fc2e</span>);
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<a href=#239 id=239 data-nosnippet>239</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0xff</span>; <span class="number">1024 </span>* <span class="number">1024</span>]), <span class="number">0x8e88ef11</span>);
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<a href=#240 id=240 data-nosnippet>240</a> }
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<a href=#241 id=241 data-nosnippet>241</a>
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<a href=#242 id=242 data-nosnippet>242</a> <span class="attr">#[test]
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<a href=#243 id=243 data-nosnippet>243</a> </span><span class="kw">fn </span>mixed() {
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<a href=#244 id=244 data-nosnippet>244</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">1</span>]), <span class="number">2 </span>| <span class="number">2 </span><< <span class="number">16</span>);
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<a href=#245 id=245 data-nosnippet>245</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">40</span>]), <span class="number">41 </span>| <span class="number">41 </span><< <span class="number">16</span>);
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<a href=#246 id=246 data-nosnippet>246</a>
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<a href=#247 id=247 data-nosnippet>247</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="kw-2">&</span>[<span class="number">0xA5</span>; <span class="number">1024 </span>* <span class="number">1024</span>]), <span class="number">0xd5009ab1</span>);
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<a href=#248 id=248 data-nosnippet>248</a> }
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<a href=#249 id=249 data-nosnippet>249</a>
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<a href=#250 id=250 data-nosnippet>250</a> <span class="doccomment">/// Example calculation from https://en.wikipedia.org/wiki/Adler-32.
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<a href=#251 id=251 data-nosnippet>251</a> </span><span class="attr">#[test]
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<a href=#252 id=252 data-nosnippet>252</a> </span><span class="kw">fn </span>wiki() {
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<a href=#253 id=253 data-nosnippet>253</a> <span class="macro">assert_eq!</span>(adler32_slice(<span class="string">b"Wikipedia"</span>), <span class="number">0x11E60398</span>);
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<a href=#254 id=254 data-nosnippet>254</a> }
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<a href=#255 id=255 data-nosnippet>255</a>
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<a href=#256 id=256 data-nosnippet>256</a> <span class="attr">#[test]
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<a href=#257 id=257 data-nosnippet>257</a> </span><span class="kw">fn </span>resume() {
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<a href=#258 id=258 data-nosnippet>258</a> <span class="kw">let </span><span class="kw-2">mut </span>adler = Adler32::new();
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<a href=#259 id=259 data-nosnippet>259</a> adler.write_slice(<span class="kw-2">&</span>[<span class="number">0xff</span>; <span class="number">1024</span>]);
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<a href=#260 id=260 data-nosnippet>260</a> <span class="kw">let </span>partial = adler.checksum();
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<a href=#261 id=261 data-nosnippet>261</a> <span class="macro">assert_eq!</span>(partial, <span class="number">0x79a6fc2e</span>); <span class="comment">// from above
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<a href=#262 id=262 data-nosnippet>262</a> </span>adler.write_slice(<span class="kw-2">&</span>[<span class="number">0xff</span>; <span class="number">1024 </span>* <span class="number">1024 </span>- <span class="number">1024</span>]);
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<a href=#263 id=263 data-nosnippet>263</a> <span class="macro">assert_eq!</span>(adler.checksum(), <span class="number">0x8e88ef11</span>); <span class="comment">// from above
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<a href=#264 id=264 data-nosnippet>264</a>
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<a href=#265 id=265 data-nosnippet>265</a> // Make sure that we can resume computing from the partial checksum via `from_checksum`.
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<a href=#266 id=266 data-nosnippet>266</a> </span><span class="kw">let </span><span class="kw-2">mut </span>adler = Adler32::from_checksum(partial);
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<a href=#267 id=267 data-nosnippet>267</a> adler.write_slice(<span class="kw-2">&</span>[<span class="number">0xff</span>; <span class="number">1024 </span>* <span class="number">1024 </span>- <span class="number">1024</span>]);
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<a href=#268 id=268 data-nosnippet>268</a> <span class="macro">assert_eq!</span>(adler.checksum(), <span class="number">0x8e88ef11</span>); <span class="comment">// from above
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<a href=#269 id=269 data-nosnippet>269</a> </span>}
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<a href=#270 id=270 data-nosnippet>270</a>
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<a href=#271 id=271 data-nosnippet>271</a> <span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
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<a href=#272 id=272 data-nosnippet>272</a> #[test]
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<a href=#273 id=273 data-nosnippet>273</a> </span><span class="kw">fn </span>bufread() {
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<a href=#274 id=274 data-nosnippet>274</a> <span class="kw">use </span>std::io::BufReader;
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<a href=#275 id=275 data-nosnippet>275</a> <span class="kw">fn </span>test(data: <span class="kw-2">&</span>[u8], checksum: u32) {
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<a href=#276 id=276 data-nosnippet>276</a> <span class="comment">// `BufReader` uses an 8 KB buffer, so this will test buffer refilling.
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<a href=#277 id=277 data-nosnippet>277</a> </span><span class="kw">let </span><span class="kw-2">mut </span>buf = BufReader::new(data);
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<a href=#278 id=278 data-nosnippet>278</a> <span class="kw">let </span>real_sum = adler32(<span class="kw-2">&mut </span>buf).unwrap();
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<a href=#279 id=279 data-nosnippet>279</a> <span class="macro">assert_eq!</span>(checksum, real_sum);
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<a href=#280 id=280 data-nosnippet>280</a> }
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<a href=#281 id=281 data-nosnippet>281</a>
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<a href=#282 id=282 data-nosnippet>282</a> test(<span class="kw-2">&</span>[], <span class="number">1</span>);
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<a href=#283 id=283 data-nosnippet>283</a> test(<span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">1024</span>], <span class="number">0x04000001</span>);
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<a href=#284 id=284 data-nosnippet>284</a> test(<span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">1024 </span>* <span class="number">1024</span>], <span class="number">0x00f00001</span>);
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<a href=#285 id=285 data-nosnippet>285</a> test(<span class="kw-2">&</span>[<span class="number">0xA5</span>; <span class="number">1024 </span>* <span class="number">1024</span>], <span class="number">0xd5009ab1</span>);
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<a href=#286 id=286 data-nosnippet>286</a> }
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<a href=#287 id=287 data-nosnippet>287</a>}
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</code></pre></div></section></main></body></html> |