122 lines
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122 lines
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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/brotli-8.0.2/src/enc/ir_interpret.rs`."><title>ir_interpret.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="brotli" 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">brotli/enc/</div>ir_interpret.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="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::alloc::SliceWrapper;
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<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span><span class="kw">super</span>::constants::{kSigned3BitContextLookup, kUTF8ContextLookup};
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<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span><span class="kw">super</span>::histogram::ContextType;
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<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span><span class="kw">super</span>::input_pair::InputReference;
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<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span><span class="kw">super</span>::interface;
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<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span><span class="kw">super</span>::interface::LiteralPredictionModeNibble;
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<a href=#7 id=7 data-nosnippet>7</a><span class="kw">pub trait </span>IRInterpreter {
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<a href=#8 id=8 data-nosnippet>8</a> <span class="kw">fn </span>inc_local_byte_offset(<span class="kw-2">&mut </span><span class="self">self</span>, inc: usize);
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<a href=#9 id=9 data-nosnippet>9</a> <span class="kw">fn </span>local_byte_offset(<span class="kw-2">&</span><span class="self">self</span>) -> usize;
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<a href=#10 id=10 data-nosnippet>10</a> <span class="kw">fn </span>update_block_type(<span class="kw-2">&mut </span><span class="self">self</span>, new_type: u8, new_stride: u8);
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<a href=#11 id=11 data-nosnippet>11</a> <span class="kw">fn </span>block_type(<span class="kw-2">&</span><span class="self">self</span>) -> u8;
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<a href=#12 id=12 data-nosnippet>12</a> <span class="kw">fn </span>literal_data_at_offset(<span class="kw-2">&</span><span class="self">self</span>, index: usize) -> u8;
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<a href=#13 id=13 data-nosnippet>13</a> <span class="kw">fn </span>literal_context_map(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8];
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<a href=#14 id=14 data-nosnippet>14</a> <span class="kw">fn </span>prediction_mode(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw">crate</span>::interface::LiteralPredictionModeNibble;
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<a href=#15 id=15 data-nosnippet>15</a> <span class="kw">fn </span>update_cost(
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<a href=#16 id=16 data-nosnippet>16</a> <span class="kw-2">&mut </span><span class="self">self</span>,
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<a href=#17 id=17 data-nosnippet>17</a> stride_prior: [u8; <span class="number">8</span>],
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<a href=#18 id=18 data-nosnippet>18</a> stride_byte_offset: usize,
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<a href=#19 id=19 data-nosnippet>19</a> selected_bits: u8,
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<a href=#20 id=20 data-nosnippet>20</a> cm_prior: usize,
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<a href=#21 id=21 data-nosnippet>21</a> literal: u8,
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<a href=#22 id=22 data-nosnippet>22</a> );
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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>
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<a href=#25 id=25 data-nosnippet>25</a><span class="kw">pub fn </span>push_base<Interpreter: IRInterpreter>(
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<a href=#26 id=26 data-nosnippet>26</a> xself: <span class="kw-2">&mut </span>Interpreter,
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<a href=#27 id=27 data-nosnippet>27</a> val: interface::Command<InputReference<<span class="lifetime">'_</span>>>,
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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="kw">match </span>val {
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<a href=#30 id=30 data-nosnippet>30</a> interface::Command::BlockSwitchCommand(<span class="kw">_</span>)
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<a href=#31 id=31 data-nosnippet>31</a> | interface::Command::BlockSwitchDistance(<span class="kw">_</span>)
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<a href=#32 id=32 data-nosnippet>32</a> | interface::Command::PredictionMode(<span class="kw">_</span>) => {}
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<a href=#33 id=33 data-nosnippet>33</a> interface::Command::Copy(<span class="kw-2">ref </span>copy) => {
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<a href=#34 id=34 data-nosnippet>34</a> xself.inc_local_byte_offset(copy.num_bytes <span class="kw">as </span>usize);
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<a href=#35 id=35 data-nosnippet>35</a> }
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<a href=#36 id=36 data-nosnippet>36</a> interface::Command::Dict(<span class="kw-2">ref </span>dict) => {
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<a href=#37 id=37 data-nosnippet>37</a> xself.inc_local_byte_offset(dict.final_size <span class="kw">as </span>usize);
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<a href=#38 id=38 data-nosnippet>38</a> }
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<a href=#39 id=39 data-nosnippet>39</a> interface::Command::BlockSwitchLiteral(block_type) => {
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<a href=#40 id=40 data-nosnippet>40</a> xself.update_block_type(block_type.block_type(), block_type.stride())
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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> interface::Command::Literal(<span class="kw-2">ref </span>lit) => {
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<a href=#43 id=43 data-nosnippet>43</a> <span class="comment">//let stride = xself.get_stride(xself.local_byte_offset()) as usize;
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<a href=#44 id=44 data-nosnippet>44</a> </span><span class="kw">let </span><span class="kw-2">mut </span>priors = [<span class="number">0u8</span>; <span class="number">8</span>];
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<a href=#45 id=45 data-nosnippet>45</a> <span class="kw">for </span>poffset <span class="kw">in </span><span class="number">0</span>..<span class="number">8 </span>{
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<a href=#46 id=46 data-nosnippet>46</a> <span class="kw">if </span>xself.local_byte_offset() > poffset {
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<a href=#47 id=47 data-nosnippet>47</a> <span class="kw">let </span>input_offset = xself.local_byte_offset() - poffset - <span class="number">1</span>;
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<a href=#48 id=48 data-nosnippet>48</a> priors[<span class="number">7 </span>- poffset] = xself.literal_data_at_offset(input_offset);
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<a href=#49 id=49 data-nosnippet>49</a> }
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<a href=#50 id=50 data-nosnippet>50</a> }
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<a href=#51 id=51 data-nosnippet>51</a> <span class="kw">let </span><span class="kw-2">mut </span>cur = <span class="number">0usize</span>;
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<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">for </span>literal <span class="kw">in </span>lit.data.slice().iter() {
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<a href=#53 id=53 data-nosnippet>53</a> <span class="kw">let </span>(huffman_table_index, selected_bits) =
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<a href=#54 id=54 data-nosnippet>54</a> compute_huffman_table_index_for_context_map(
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<a href=#55 id=55 data-nosnippet>55</a> priors[(cur + <span class="number">7</span>) & <span class="number">7</span>],
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<a href=#56 id=56 data-nosnippet>56</a> priors[(cur + <span class="number">6</span>) & <span class="number">7</span>],
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<a href=#57 id=57 data-nosnippet>57</a> xself.literal_context_map(),
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<a href=#58 id=58 data-nosnippet>58</a> xself.prediction_mode(),
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<a href=#59 id=59 data-nosnippet>59</a> xself.block_type(),
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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> xself.update_cost(
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<a href=#62 id=62 data-nosnippet>62</a> priors,
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<a href=#63 id=63 data-nosnippet>63</a> (cur + <span class="number">7</span>) & <span class="number">7</span>,
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<a href=#64 id=64 data-nosnippet>64</a> selected_bits,
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<a href=#65 id=65 data-nosnippet>65</a> huffman_table_index,
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<a href=#66 id=66 data-nosnippet>66</a> <span class="kw-2">*</span>literal,
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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> priors[cur & <span class="number">7</span>] = <span class="kw-2">*</span>literal;
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<a href=#69 id=69 data-nosnippet>69</a> cur += <span class="number">1</span>;
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<a href=#70 id=70 data-nosnippet>70</a> cur &= <span class="number">7</span>;
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<a href=#71 id=71 data-nosnippet>71</a> }
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<a href=#72 id=72 data-nosnippet>72</a> xself.inc_local_byte_offset(lit.data.slice().len());
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<a href=#73 id=73 data-nosnippet>73</a> }
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<a href=#74 id=74 data-nosnippet>74</a> }
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<a href=#75 id=75 data-nosnippet>75</a>}
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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><span class="comment">// not sure why this fails
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<a href=#78 id=78 data-nosnippet>78</a>//impl<'a> interface::CommandProcessor<'a> for IRInterpreter {
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<a href=#79 id=79 data-nosnippet>79</a>// fn push<Cb: FnMut(&[interface::Command<InputReference>])>(&mut self,
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<a href=#80 id=80 data-nosnippet>80</a>// val: interface::Command<InputReference<'a>>,
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<a href=#81 id=81 data-nosnippet>81</a>// callback: &mut Cb) {
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<a href=#82 id=82 data-nosnippet>82</a>// push_base(self, val, callback)
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<a href=#83 id=83 data-nosnippet>83</a>// }
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<a href=#84 id=84 data-nosnippet>84</a>//}
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<a href=#85 id=85 data-nosnippet>85</a>
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<a href=#86 id=86 data-nosnippet>86</a></span><span class="kw">fn </span>compute_huffman_table_index_for_context_map(
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<a href=#87 id=87 data-nosnippet>87</a> prev_byte: u8,
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<a href=#88 id=88 data-nosnippet>88</a> prev_prev_byte: u8,
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<a href=#89 id=89 data-nosnippet>89</a> literal_context_map: <span class="kw-2">&</span>[u8], <span class="comment">//interface::PredictionModeContextMap<SliceType>,
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<a href=#90 id=90 data-nosnippet>90</a> </span>prediction_mode: LiteralPredictionModeNibble,
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<a href=#91 id=91 data-nosnippet>91</a> block_type: u8,
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<a href=#92 id=92 data-nosnippet>92</a>) -> (usize, u8) {
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<a href=#93 id=93 data-nosnippet>93</a> <span class="kw">let </span>prior = Context(
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<a href=#94 id=94 data-nosnippet>94</a> prev_byte,
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<a href=#95 id=95 data-nosnippet>95</a> prev_prev_byte,
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<a href=#96 id=96 data-nosnippet>96</a> prediction_mode.to_context_enum().unwrap(),
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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> <span class="macro">assert!</span>(prior < <span class="number">64</span>);
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<a href=#99 id=99 data-nosnippet>99</a> <span class="kw">let </span>context_map_index = ((block_type <span class="kw">as </span>usize) << <span class="number">6</span>) | prior <span class="kw">as </span>usize;
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<a href=#100 id=100 data-nosnippet>100</a> <span class="kw">if </span>context_map_index < literal_context_map.len() {
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<a href=#101 id=101 data-nosnippet>101</a> (literal_context_map[context_map_index] <span class="kw">as </span>usize, prior)
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<a href=#102 id=102 data-nosnippet>102</a> } <span class="kw">else </span>{
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<a href=#103 id=103 data-nosnippet>103</a> (prior <span class="kw">as </span>usize, prior)
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<a href=#104 id=104 data-nosnippet>104</a> }
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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><span class="kw">pub fn </span>Context(p1: u8, p2: u8, mode: ContextType) -> u8 {
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<a href=#108 id=108 data-nosnippet>108</a> <span class="kw">match </span>mode {
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<a href=#109 id=109 data-nosnippet>109</a> ContextType::CONTEXT_LSB6 => p1 & <span class="number">0x3f</span>,
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<a href=#110 id=110 data-nosnippet>110</a> ContextType::CONTEXT_MSB6 => (p1 <span class="kw">as </span>i32 >> <span class="number">2</span>) <span class="kw">as </span>u8,
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<a href=#111 id=111 data-nosnippet>111</a> ContextType::CONTEXT_UTF8 => {
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<a href=#112 id=112 data-nosnippet>112</a> (kUTF8ContextLookup[p1 <span class="kw">as </span>usize] <span class="kw">as </span>i32
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<a href=#113 id=113 data-nosnippet>113</a> | kUTF8ContextLookup[(p2 <span class="kw">as </span>i32 + <span class="number">256i32</span>) <span class="kw">as </span>usize] <span class="kw">as </span>i32) <span class="kw">as </span>u8
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<a href=#114 id=114 data-nosnippet>114</a> }
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<a href=#115 id=115 data-nosnippet>115</a> ContextType::CONTEXT_SIGNED => {
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<a href=#116 id=116 data-nosnippet>116</a> (((kSigned3BitContextLookup[p1 <span class="kw">as </span>usize] <span class="kw">as </span>i32) << <span class="number">3</span>)
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<a href=#117 id=117 data-nosnippet>117</a> + kSigned3BitContextLookup[p2 <span class="kw">as </span>usize] <span class="kw">as </span>i32) <span class="kw">as </span>u8
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<a href=#118 id=118 data-nosnippet>118</a> }
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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> <span class="comment">// 0u8
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<a href=#121 id=121 data-nosnippet>121</a></span>}
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</code></pre></div></section></main></body></html> |