152 lines
16 KiB
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152 lines
16 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/zstd-0.13.3/src/bulk/decompressor.rs`."><title>decompressor.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="zstd" 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">zstd/bulk/</div>decompressor.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">crate</span>::map_error_code;
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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><span class="attr">#[cfg(feature = <span class="string">"experimental"</span>)]
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<a href=#4 id=4 data-nosnippet>4</a></span><span class="kw">use </span>std::convert::TryInto;
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<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>std::io;
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<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>zstd_safe;
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<a href=#7 id=7 data-nosnippet>7</a>
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<a href=#8 id=8 data-nosnippet>8</a><span class="doccomment">/// Allows to decompress independently multiple blocks of data.
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<a href=#9 id=9 data-nosnippet>9</a>///
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<a href=#10 id=10 data-nosnippet>10</a>/// This reduces memory usage compared to calling `decompress` multiple times.
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<a href=#11 id=11 data-nosnippet>11</a></span><span class="attr">#[derive(Default)]
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<a href=#12 id=12 data-nosnippet>12</a></span><span class="kw">pub struct </span>Decompressor<<span class="lifetime">'a</span>> {
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<a href=#13 id=13 data-nosnippet>13</a> context: zstd_safe::DCtx<<span class="lifetime">'a</span>>,
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<a href=#14 id=14 data-nosnippet>14</a>}
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<a href=#15 id=15 data-nosnippet>15</a>
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<a href=#16 id=16 data-nosnippet>16</a><span class="kw">impl </span>Decompressor<<span class="lifetime">'static</span>> {
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<a href=#17 id=17 data-nosnippet>17</a> <span class="doccomment">/// Creates a new zstd decompressor.
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<a href=#18 id=18 data-nosnippet>18</a> </span><span class="kw">pub fn </span>new() -> io::Result<<span class="self">Self</span>> {
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<a href=#19 id=19 data-nosnippet>19</a> <span class="self">Self</span>::with_dictionary(<span class="kw-2">&</span>[])
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<a href=#20 id=20 data-nosnippet>20</a> }
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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="doccomment">/// Creates a new zstd decompressor, using the given dictionary.
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<a href=#23 id=23 data-nosnippet>23</a> </span><span class="kw">pub fn </span>with_dictionary(dictionary: <span class="kw-2">&</span>[u8]) -> io::Result<<span class="self">Self</span>> {
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<a href=#24 id=24 data-nosnippet>24</a> <span class="kw">let </span><span class="kw-2">mut </span>decompressor = <span class="self">Self</span>::default();
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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> decompressor.set_dictionary(dictionary)<span class="question-mark">?</span>;
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<a href=#27 id=27 data-nosnippet>27</a>
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<a href=#28 id=28 data-nosnippet>28</a> <span class="prelude-val">Ok</span>(decompressor)
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<a href=#29 id=29 data-nosnippet>29</a> }
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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>
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<a href=#32 id=32 data-nosnippet>32</a><span class="kw">impl</span><<span class="lifetime">'a</span>> Decompressor<<span class="lifetime">'a</span>> {
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<a href=#33 id=33 data-nosnippet>33</a> <span class="doccomment">/// Creates a new decompressor using an existing `DecoderDictionary`.
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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> /// Note that using a dictionary means that compression will need to use
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<a href=#36 id=36 data-nosnippet>36</a> /// the same dictionary.
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<a href=#37 id=37 data-nosnippet>37</a> </span><span class="kw">pub fn </span>with_prepared_dictionary<<span class="lifetime">'b</span>>(
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<a href=#38 id=38 data-nosnippet>38</a> dictionary: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw">crate</span>::dict::DecoderDictionary<<span class="lifetime">'b</span>>,
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<a href=#39 id=39 data-nosnippet>39</a> ) -> io::Result<<span class="self">Self</span>>
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<a href=#40 id=40 data-nosnippet>40</a> <span class="kw">where
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<a href=#41 id=41 data-nosnippet>41</a> </span><span class="lifetime">'b</span>: <span class="lifetime">'a</span>,
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<a href=#42 id=42 data-nosnippet>42</a> {
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<a href=#43 id=43 data-nosnippet>43</a> <span class="kw">let </span><span class="kw-2">mut </span>decompressor = <span class="self">Self</span>::default();
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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> decompressor.set_prepared_dictionary(dictionary)<span class="question-mark">?</span>;
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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> <span class="prelude-val">Ok</span>(decompressor)
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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>
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<a href=#50 id=50 data-nosnippet>50</a> <span class="doccomment">/// Changes the dictionary used by this decompressor.
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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> /// Will affect future compression jobs.
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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> /// Note that using a dictionary means that compression will need to use
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<a href=#55 id=55 data-nosnippet>55</a> /// the same dictionary.
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<a href=#56 id=56 data-nosnippet>56</a> </span><span class="kw">pub fn </span>set_dictionary(<span class="kw-2">&mut </span><span class="self">self</span>, dictionary: <span class="kw-2">&</span>[u8]) -> io::Result<()> {
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<a href=#57 id=57 data-nosnippet>57</a> <span class="self">self</span>.context
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<a href=#58 id=58 data-nosnippet>58</a> .load_dictionary(dictionary)
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<a href=#59 id=59 data-nosnippet>59</a> .map_err(map_error_code)<span class="question-mark">?</span>;
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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> <span class="prelude-val">Ok</span>(())
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<a href=#62 id=62 data-nosnippet>62</a> }
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<a href=#63 id=63 data-nosnippet>63</a>
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<a href=#64 id=64 data-nosnippet>64</a> <span class="doccomment">/// Changes the dictionary used by this decompressor.
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<a href=#65 id=65 data-nosnippet>65</a> ///
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<a href=#66 id=66 data-nosnippet>66</a> /// Note that using a dictionary means that compression will need to use
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<a href=#67 id=67 data-nosnippet>67</a> /// the same dictionary.
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<a href=#68 id=68 data-nosnippet>68</a> </span><span class="kw">pub fn </span>set_prepared_dictionary<<span class="lifetime">'b</span>>(
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<a href=#69 id=69 data-nosnippet>69</a> <span class="kw-2">&mut </span><span class="self">self</span>,
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<a href=#70 id=70 data-nosnippet>70</a> dictionary: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw">crate</span>::dict::DecoderDictionary<<span class="lifetime">'b</span>>,
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<a href=#71 id=71 data-nosnippet>71</a> ) -> io::Result<()>
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<a href=#72 id=72 data-nosnippet>72</a> <span class="kw">where
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<a href=#73 id=73 data-nosnippet>73</a> </span><span class="lifetime">'b</span>: <span class="lifetime">'a</span>,
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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> <span class="self">self</span>.context
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<a href=#76 id=76 data-nosnippet>76</a> .ref_ddict(dictionary.as_ddict())
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<a href=#77 id=77 data-nosnippet>77</a> .map_err(map_error_code)<span class="question-mark">?</span>;
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<a href=#78 id=78 data-nosnippet>78</a>
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<a href=#79 id=79 data-nosnippet>79</a> <span class="prelude-val">Ok</span>(())
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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> <span class="doccomment">/// Deompress a single block of data to the given destination buffer.
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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> /// Returns the number of bytes written, or an error if something happened
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<a href=#85 id=85 data-nosnippet>85</a> /// (for instance if the destination buffer was too small).
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<a href=#86 id=86 data-nosnippet>86</a> </span><span class="kw">pub fn </span>decompress_to_buffer<C: zstd_safe::WriteBuf + <span class="question-mark">?</span>Sized>(
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<a href=#87 id=87 data-nosnippet>87</a> <span class="kw-2">&mut </span><span class="self">self</span>,
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<a href=#88 id=88 data-nosnippet>88</a> source: <span class="kw-2">&</span>[u8],
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<a href=#89 id=89 data-nosnippet>89</a> destination: <span class="kw-2">&mut </span>C,
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<a href=#90 id=90 data-nosnippet>90</a> ) -> io::Result<usize> {
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<a href=#91 id=91 data-nosnippet>91</a> <span class="self">self</span>.context
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<a href=#92 id=92 data-nosnippet>92</a> .decompress(destination, source)
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<a href=#93 id=93 data-nosnippet>93</a> .map_err(map_error_code)
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<a href=#94 id=94 data-nosnippet>94</a> }
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<a href=#95 id=95 data-nosnippet>95</a>
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<a href=#96 id=96 data-nosnippet>96</a> <span class="doccomment">/// Decompress a block of data, and return the result in a `Vec<u8>`.
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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> /// The decompressed data should be at most `capacity` bytes,
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<a href=#99 id=99 data-nosnippet>99</a> /// or an error will be returned.
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<a href=#100 id=100 data-nosnippet>100</a> </span><span class="kw">pub fn </span>decompress(
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<a href=#101 id=101 data-nosnippet>101</a> <span class="kw-2">&mut </span><span class="self">self</span>,
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<a href=#102 id=102 data-nosnippet>102</a> data: <span class="kw-2">&</span>[u8],
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<a href=#103 id=103 data-nosnippet>103</a> capacity: usize,
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<a href=#104 id=104 data-nosnippet>104</a> ) -> io::Result<Vec<u8>> {
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<a href=#105 id=105 data-nosnippet>105</a> <span class="kw">let </span>capacity =
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<a href=#106 id=106 data-nosnippet>106</a> <span class="self">Self</span>::upper_bound(data).unwrap_or(capacity).min(capacity);
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<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">let </span><span class="kw-2">mut </span>buffer = Vec::with_capacity(capacity);
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<a href=#108 id=108 data-nosnippet>108</a> <span class="self">self</span>.decompress_to_buffer(data, <span class="kw-2">&mut </span>buffer)<span class="question-mark">?</span>;
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<a href=#109 id=109 data-nosnippet>109</a> <span class="prelude-val">Ok</span>(buffer)
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<a href=#110 id=110 data-nosnippet>110</a> }
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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> <span class="doccomment">/// Sets a decompression parameter for this decompressor.
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<a href=#113 id=113 data-nosnippet>113</a> </span><span class="kw">pub fn </span>set_parameter(
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<a href=#114 id=114 data-nosnippet>114</a> <span class="kw-2">&mut </span><span class="self">self</span>,
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<a href=#115 id=115 data-nosnippet>115</a> parameter: zstd_safe::DParameter,
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<a href=#116 id=116 data-nosnippet>116</a> ) -> io::Result<()> {
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<a href=#117 id=117 data-nosnippet>117</a> <span class="self">self</span>.context
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<a href=#118 id=118 data-nosnippet>118</a> .set_parameter(parameter)
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<a href=#119 id=119 data-nosnippet>119</a> .map_err(map_error_code)<span class="question-mark">?</span>;
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<a href=#120 id=120 data-nosnippet>120</a> <span class="prelude-val">Ok</span>(())
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<a href=#121 id=121 data-nosnippet>121</a> }
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<a href=#122 id=122 data-nosnippet>122</a>
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<a href=#123 id=123 data-nosnippet>123</a> <span class="macro">crate::decoder_parameters!</span>();
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<a href=#124 id=124 data-nosnippet>124</a>
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<a href=#125 id=125 data-nosnippet>125</a> <span class="doccomment">/// Get an upper bound on the decompressed size of data, if available
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<a href=#126 id=126 data-nosnippet>126</a> ///
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<a href=#127 id=127 data-nosnippet>127</a> /// This can be used to pre-allocate enough capacity for `decompress_to_buffer`
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<a href=#128 id=128 data-nosnippet>128</a> /// and is used by `decompress` to ensure that it does not over-allocate if
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<a href=#129 id=129 data-nosnippet>129</a> /// you supply a large `capacity`.
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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> /// Will return `None` if the upper bound cannot be determined or is larger than `usize::MAX`
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<a href=#132 id=132 data-nosnippet>132</a> ///
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<a href=#133 id=133 data-nosnippet>133</a> /// Note that unless the `experimental` feature is enabled, this will always return `None`.
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<a href=#134 id=134 data-nosnippet>134</a> </span><span class="kw">pub fn </span>upper_bound(_data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> {
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<a href=#135 id=135 data-nosnippet>135</a> <span class="attr">#[cfg(feature = <span class="string">"experimental"</span>)]
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<a href=#136 id=136 data-nosnippet>136</a> </span>{
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<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">let </span>bound = zstd_safe::decompress_bound(_data).ok()<span class="question-mark">?</span>;
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<a href=#138 id=138 data-nosnippet>138</a> bound.try_into().ok()
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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> <span class="attr">#[cfg(not(feature = <span class="string">"experimental"</span>))]
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<a href=#141 id=141 data-nosnippet>141</a> </span>{
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<a href=#142 id=142 data-nosnippet>142</a> <span class="prelude-val">None
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<a href=#143 id=143 data-nosnippet>143</a> </span>}
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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">fn </span>_assert_traits() {
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<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">fn </span>_assert_send<T: Send>(<span class="kw">_</span>: T) {}
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<a href=#149 id=149 data-nosnippet>149</a>
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<a href=#150 id=150 data-nosnippet>150</a> _assert_send(Decompressor::new());
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<a href=#151 id=151 data-nosnippet>151</a>}
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</code></pre></div></section></main></body></html> |