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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/num-bigint-0.4.6/src/bigint/convert.rs`."><title>convert.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="num_bigint" 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">num_bigint/bigint/</div>convert.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>::Sign::{<span class="self">self</span>, Minus, NoSign, Plus};
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use super</span>::{BigInt, ToBigInt};
<a href=#3 id=3 data-nosnippet>3</a>
<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span><span class="kw">crate</span>::TryFromBigIntError;
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use crate</span>::{BigUint, ParseBigIntError, ToBigUint};
<a href=#6 id=6 data-nosnippet>6</a>
<a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>alloc::vec::Vec;
<a href=#8 id=8 data-nosnippet>8</a><span class="kw">use </span>core::cmp::Ordering::{Equal, Greater, Less};
<a href=#9 id=9 data-nosnippet>9</a><span class="kw">use </span>core::convert::TryFrom;
<a href=#10 id=10 data-nosnippet>10</a><span class="kw">use </span>core::str::{<span class="self">self</span>, FromStr};
<a href=#11 id=11 data-nosnippet>11</a><span class="kw">use </span>num_traits::{FromPrimitive, Num, One, ToPrimitive, Zero};
<a href=#12 id=12 data-nosnippet>12</a>
<a href=#13 id=13 data-nosnippet>13</a><span class="kw">impl </span>FromStr <span class="kw">for </span>BigInt {
<a href=#14 id=14 data-nosnippet>14</a> <span class="kw">type </span><span class="prelude-val">Err </span>= ParseBigIntError;
<a href=#15 id=15 data-nosnippet>15</a>
<a href=#16 id=16 data-nosnippet>16</a> <span class="attr">#[inline]
<a href=#17 id=17 data-nosnippet>17</a> </span><span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;BigInt, ParseBigIntError&gt; {
<a href=#18 id=18 data-nosnippet>18</a> BigInt::from_str_radix(s, <span class="number">10</span>)
<a href=#19 id=19 data-nosnippet>19</a> }
<a href=#20 id=20 data-nosnippet>20</a>}
<a href=#21 id=21 data-nosnippet>21</a>
<a href=#22 id=22 data-nosnippet>22</a><span class="kw">impl </span>Num <span class="kw">for </span>BigInt {
<a href=#23 id=23 data-nosnippet>23</a> <span class="kw">type </span>FromStrRadixErr = ParseBigIntError;
<a href=#24 id=24 data-nosnippet>24</a>
<a href=#25 id=25 data-nosnippet>25</a> <span class="doccomment">/// Creates and initializes a [`BigInt`].
<a href=#26 id=26 data-nosnippet>26</a> </span><span class="attr">#[inline]
<a href=#27 id=27 data-nosnippet>27</a> </span><span class="kw">fn </span>from_str_radix(<span class="kw-2">mut </span>s: <span class="kw-2">&amp;</span>str, radix: u32) -&gt; <span class="prelude-ty">Result</span>&lt;BigInt, ParseBigIntError&gt; {
<a href=#28 id=28 data-nosnippet>28</a> <span class="kw">let </span>sign = <span class="kw">if let </span><span class="prelude-val">Some</span>(tail) = s.strip_prefix(<span class="string">'-'</span>) {
<a href=#29 id=29 data-nosnippet>29</a> <span class="kw">if </span>!tail.starts_with(<span class="string">'+'</span>) {
<a href=#30 id=30 data-nosnippet>30</a> s = tail
<a href=#31 id=31 data-nosnippet>31</a> }
<a href=#32 id=32 data-nosnippet>32</a> Minus
<a href=#33 id=33 data-nosnippet>33</a> } <span class="kw">else </span>{
<a href=#34 id=34 data-nosnippet>34</a> Plus
<a href=#35 id=35 data-nosnippet>35</a> };
<a href=#36 id=36 data-nosnippet>36</a> <span class="kw">let </span>bu = BigUint::from_str_radix(s, radix)<span class="question-mark">?</span>;
<a href=#37 id=37 data-nosnippet>37</a> <span class="prelude-val">Ok</span>(BigInt::from_biguint(sign, bu))
<a href=#38 id=38 data-nosnippet>38</a> }
<a href=#39 id=39 data-nosnippet>39</a>}
<a href=#40 id=40 data-nosnippet>40</a>
<a href=#41 id=41 data-nosnippet>41</a><span class="kw">impl </span>ToPrimitive <span class="kw">for </span>BigInt {
<a href=#42 id=42 data-nosnippet>42</a> <span class="attr">#[inline]
<a href=#43 id=43 data-nosnippet>43</a> </span><span class="kw">fn </span>to_i64(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;i64&gt; {
<a href=#44 id=44 data-nosnippet>44</a> <span class="kw">match </span><span class="self">self</span>.sign {
<a href=#45 id=45 data-nosnippet>45</a> Plus =&gt; <span class="self">self</span>.data.to_i64(),
<a href=#46 id=46 data-nosnippet>46</a> NoSign =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
<a href=#47 id=47 data-nosnippet>47</a> Minus =&gt; {
<a href=#48 id=48 data-nosnippet>48</a> <span class="kw">let </span>n = <span class="self">self</span>.data.to_u64()<span class="question-mark">?</span>;
<a href=#49 id=49 data-nosnippet>49</a> <span class="kw">let </span>m: u64 = <span class="number">1 </span>&lt;&lt; <span class="number">63</span>;
<a href=#50 id=50 data-nosnippet>50</a> <span class="kw">match </span>n.cmp(<span class="kw-2">&amp;</span>m) {
<a href=#51 id=51 data-nosnippet>51</a> Less =&gt; <span class="prelude-val">Some</span>(-(n <span class="kw">as </span>i64)),
<a href=#52 id=52 data-nosnippet>52</a> Equal =&gt; <span class="prelude-val">Some</span>(i64::MIN),
<a href=#53 id=53 data-nosnippet>53</a> Greater =&gt; <span class="prelude-val">None</span>,
<a href=#54 id=54 data-nosnippet>54</a> }
<a href=#55 id=55 data-nosnippet>55</a> }
<a href=#56 id=56 data-nosnippet>56</a> }
<a href=#57 id=57 data-nosnippet>57</a> }
<a href=#58 id=58 data-nosnippet>58</a>
<a href=#59 id=59 data-nosnippet>59</a> <span class="attr">#[inline]
<a href=#60 id=60 data-nosnippet>60</a> </span><span class="kw">fn </span>to_i128(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;i128&gt; {
<a href=#61 id=61 data-nosnippet>61</a> <span class="kw">match </span><span class="self">self</span>.sign {
<a href=#62 id=62 data-nosnippet>62</a> Plus =&gt; <span class="self">self</span>.data.to_i128(),
<a href=#63 id=63 data-nosnippet>63</a> NoSign =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
<a href=#64 id=64 data-nosnippet>64</a> Minus =&gt; {
<a href=#65 id=65 data-nosnippet>65</a> <span class="kw">let </span>n = <span class="self">self</span>.data.to_u128()<span class="question-mark">?</span>;
<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">let </span>m: u128 = <span class="number">1 </span>&lt;&lt; <span class="number">127</span>;
<a href=#67 id=67 data-nosnippet>67</a> <span class="kw">match </span>n.cmp(<span class="kw-2">&amp;</span>m) {
<a href=#68 id=68 data-nosnippet>68</a> Less =&gt; <span class="prelude-val">Some</span>(-(n <span class="kw">as </span>i128)),
<a href=#69 id=69 data-nosnippet>69</a> Equal =&gt; <span class="prelude-val">Some</span>(i128::MIN),
<a href=#70 id=70 data-nosnippet>70</a> Greater =&gt; <span class="prelude-val">None</span>,
<a href=#71 id=71 data-nosnippet>71</a> }
<a href=#72 id=72 data-nosnippet>72</a> }
<a href=#73 id=73 data-nosnippet>73</a> }
<a href=#74 id=74 data-nosnippet>74</a> }
<a href=#75 id=75 data-nosnippet>75</a>
<a href=#76 id=76 data-nosnippet>76</a> <span class="attr">#[inline]
<a href=#77 id=77 data-nosnippet>77</a> </span><span class="kw">fn </span>to_u64(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u64&gt; {
<a href=#78 id=78 data-nosnippet>78</a> <span class="kw">match </span><span class="self">self</span>.sign {
<a href=#79 id=79 data-nosnippet>79</a> Plus =&gt; <span class="self">self</span>.data.to_u64(),
<a href=#80 id=80 data-nosnippet>80</a> NoSign =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
<a href=#81 id=81 data-nosnippet>81</a> Minus =&gt; <span class="prelude-val">None</span>,
<a href=#82 id=82 data-nosnippet>82</a> }
<a href=#83 id=83 data-nosnippet>83</a> }
<a href=#84 id=84 data-nosnippet>84</a>
<a href=#85 id=85 data-nosnippet>85</a> <span class="attr">#[inline]
<a href=#86 id=86 data-nosnippet>86</a> </span><span class="kw">fn </span>to_u128(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u128&gt; {
<a href=#87 id=87 data-nosnippet>87</a> <span class="kw">match </span><span class="self">self</span>.sign {
<a href=#88 id=88 data-nosnippet>88</a> Plus =&gt; <span class="self">self</span>.data.to_u128(),
<a href=#89 id=89 data-nosnippet>89</a> NoSign =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
<a href=#90 id=90 data-nosnippet>90</a> Minus =&gt; <span class="prelude-val">None</span>,
<a href=#91 id=91 data-nosnippet>91</a> }
<a href=#92 id=92 data-nosnippet>92</a> }
<a href=#93 id=93 data-nosnippet>93</a>
<a href=#94 id=94 data-nosnippet>94</a> <span class="attr">#[inline]
<a href=#95 id=95 data-nosnippet>95</a> </span><span class="kw">fn </span>to_f32(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;f32&gt; {
<a href=#96 id=96 data-nosnippet>96</a> <span class="kw">let </span>n = <span class="self">self</span>.data.to_f32()<span class="question-mark">?</span>;
<a href=#97 id=97 data-nosnippet>97</a> <span class="prelude-val">Some</span>(<span class="kw">if </span><span class="self">self</span>.sign == Minus { -n } <span class="kw">else </span>{ n })
<a href=#98 id=98 data-nosnippet>98</a> }
<a href=#99 id=99 data-nosnippet>99</a>
<a href=#100 id=100 data-nosnippet>100</a> <span class="attr">#[inline]
<a href=#101 id=101 data-nosnippet>101</a> </span><span class="kw">fn </span>to_f64(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;f64&gt; {
<a href=#102 id=102 data-nosnippet>102</a> <span class="kw">let </span>n = <span class="self">self</span>.data.to_f64()<span class="question-mark">?</span>;
<a href=#103 id=103 data-nosnippet>103</a> <span class="prelude-val">Some</span>(<span class="kw">if </span><span class="self">self</span>.sign == Minus { -n } <span class="kw">else </span>{ n })
<a href=#104 id=104 data-nosnippet>104</a> }
<a href=#105 id=105 data-nosnippet>105</a>}
<a href=#106 id=106 data-nosnippet>106</a>
<a href=#107 id=107 data-nosnippet>107</a><span class="macro">macro_rules!</span> impl_try_from_bigint {
<a href=#108 id=108 data-nosnippet>108</a> (<span class="macro-nonterminal">$T</span>:ty, <span class="macro-nonterminal">$to_ty</span>:path) =&gt; {
<a href=#109 id=109 data-nosnippet>109</a> <span class="kw">impl </span>TryFrom&lt;<span class="kw-2">&amp;</span>BigInt&gt; <span class="kw">for </span><span class="macro-nonterminal">$T </span>{
<a href=#110 id=110 data-nosnippet>110</a> <span class="kw">type </span>Error = TryFromBigIntError&lt;()&gt;;
<a href=#111 id=111 data-nosnippet>111</a>
<a href=#112 id=112 data-nosnippet>112</a> <span class="attr">#[inline]
<a href=#113 id=113 data-nosnippet>113</a> </span><span class="kw">fn </span>try_from(value: <span class="kw-2">&amp;</span>BigInt) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="macro-nonterminal">$T</span>, TryFromBigIntError&lt;()&gt;&gt; {
<a href=#114 id=114 data-nosnippet>114</a> <span class="macro-nonterminal">$to_ty</span>(value).ok_or(TryFromBigIntError::new(()))
<a href=#115 id=115 data-nosnippet>115</a> }
<a href=#116 id=116 data-nosnippet>116</a> }
<a href=#117 id=117 data-nosnippet>117</a>
<a href=#118 id=118 data-nosnippet>118</a> <span class="kw">impl </span>TryFrom&lt;BigInt&gt; <span class="kw">for </span><span class="macro-nonterminal">$T </span>{
<a href=#119 id=119 data-nosnippet>119</a> <span class="kw">type </span>Error = TryFromBigIntError&lt;BigInt&gt;;
<a href=#120 id=120 data-nosnippet>120</a>
<a href=#121 id=121 data-nosnippet>121</a> <span class="attr">#[inline]
<a href=#122 id=122 data-nosnippet>122</a> </span><span class="kw">fn </span>try_from(value: BigInt) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="macro-nonterminal">$T</span>, TryFromBigIntError&lt;BigInt&gt;&gt; {
<a href=#123 id=123 data-nosnippet>123</a> &lt;<span class="macro-nonterminal">$T</span>&gt;::try_from(<span class="kw-2">&amp;</span>value).map_err(|<span class="kw">_</span>| TryFromBigIntError::new(value))
<a href=#124 id=124 data-nosnippet>124</a> }
<a href=#125 id=125 data-nosnippet>125</a> }
<a href=#126 id=126 data-nosnippet>126</a> };
<a href=#127 id=127 data-nosnippet>127</a>}
<a href=#128 id=128 data-nosnippet>128</a>
<a href=#129 id=129 data-nosnippet>129</a><span class="macro">impl_try_from_bigint!</span>(u8, ToPrimitive::to_u8);
<a href=#130 id=130 data-nosnippet>130</a><span class="macro">impl_try_from_bigint!</span>(u16, ToPrimitive::to_u16);
<a href=#131 id=131 data-nosnippet>131</a><span class="macro">impl_try_from_bigint!</span>(u32, ToPrimitive::to_u32);
<a href=#132 id=132 data-nosnippet>132</a><span class="macro">impl_try_from_bigint!</span>(u64, ToPrimitive::to_u64);
<a href=#133 id=133 data-nosnippet>133</a><span class="macro">impl_try_from_bigint!</span>(usize, ToPrimitive::to_usize);
<a href=#134 id=134 data-nosnippet>134</a><span class="macro">impl_try_from_bigint!</span>(u128, ToPrimitive::to_u128);
<a href=#135 id=135 data-nosnippet>135</a>
<a href=#136 id=136 data-nosnippet>136</a><span class="macro">impl_try_from_bigint!</span>(i8, ToPrimitive::to_i8);
<a href=#137 id=137 data-nosnippet>137</a><span class="macro">impl_try_from_bigint!</span>(i16, ToPrimitive::to_i16);
<a href=#138 id=138 data-nosnippet>138</a><span class="macro">impl_try_from_bigint!</span>(i32, ToPrimitive::to_i32);
<a href=#139 id=139 data-nosnippet>139</a><span class="macro">impl_try_from_bigint!</span>(i64, ToPrimitive::to_i64);
<a href=#140 id=140 data-nosnippet>140</a><span class="macro">impl_try_from_bigint!</span>(isize, ToPrimitive::to_isize);
<a href=#141 id=141 data-nosnippet>141</a><span class="macro">impl_try_from_bigint!</span>(i128, ToPrimitive::to_i128);
<a href=#142 id=142 data-nosnippet>142</a>
<a href=#143 id=143 data-nosnippet>143</a><span class="kw">impl </span>FromPrimitive <span class="kw">for </span>BigInt {
<a href=#144 id=144 data-nosnippet>144</a> <span class="attr">#[inline]
<a href=#145 id=145 data-nosnippet>145</a> </span><span class="kw">fn </span>from_i64(n: i64) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#146 id=146 data-nosnippet>146</a> <span class="prelude-val">Some</span>(BigInt::from(n))
<a href=#147 id=147 data-nosnippet>147</a> }
<a href=#148 id=148 data-nosnippet>148</a>
<a href=#149 id=149 data-nosnippet>149</a> <span class="attr">#[inline]
<a href=#150 id=150 data-nosnippet>150</a> </span><span class="kw">fn </span>from_i128(n: i128) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#151 id=151 data-nosnippet>151</a> <span class="prelude-val">Some</span>(BigInt::from(n))
<a href=#152 id=152 data-nosnippet>152</a> }
<a href=#153 id=153 data-nosnippet>153</a>
<a href=#154 id=154 data-nosnippet>154</a> <span class="attr">#[inline]
<a href=#155 id=155 data-nosnippet>155</a> </span><span class="kw">fn </span>from_u64(n: u64) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#156 id=156 data-nosnippet>156</a> <span class="prelude-val">Some</span>(BigInt::from(n))
<a href=#157 id=157 data-nosnippet>157</a> }
<a href=#158 id=158 data-nosnippet>158</a>
<a href=#159 id=159 data-nosnippet>159</a> <span class="attr">#[inline]
<a href=#160 id=160 data-nosnippet>160</a> </span><span class="kw">fn </span>from_u128(n: u128) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#161 id=161 data-nosnippet>161</a> <span class="prelude-val">Some</span>(BigInt::from(n))
<a href=#162 id=162 data-nosnippet>162</a> }
<a href=#163 id=163 data-nosnippet>163</a>
<a href=#164 id=164 data-nosnippet>164</a> <span class="attr">#[inline]
<a href=#165 id=165 data-nosnippet>165</a> </span><span class="kw">fn </span>from_f64(n: f64) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#166 id=166 data-nosnippet>166</a> <span class="kw">if </span>n &gt;= <span class="number">0.0 </span>{
<a href=#167 id=167 data-nosnippet>167</a> BigUint::from_f64(n).map(BigInt::from)
<a href=#168 id=168 data-nosnippet>168</a> } <span class="kw">else </span>{
<a href=#169 id=169 data-nosnippet>169</a> <span class="kw">let </span>x = BigUint::from_f64(-n)<span class="question-mark">?</span>;
<a href=#170 id=170 data-nosnippet>170</a> <span class="prelude-val">Some</span>(-BigInt::from(x))
<a href=#171 id=171 data-nosnippet>171</a> }
<a href=#172 id=172 data-nosnippet>172</a> }
<a href=#173 id=173 data-nosnippet>173</a>}
<a href=#174 id=174 data-nosnippet>174</a>
<a href=#175 id=175 data-nosnippet>175</a><span class="kw">impl </span>From&lt;i64&gt; <span class="kw">for </span>BigInt {
<a href=#176 id=176 data-nosnippet>176</a> <span class="attr">#[inline]
<a href=#177 id=177 data-nosnippet>177</a> </span><span class="kw">fn </span>from(n: i64) -&gt; <span class="self">Self </span>{
<a href=#178 id=178 data-nosnippet>178</a> <span class="kw">if </span>n &gt;= <span class="number">0 </span>{
<a href=#179 id=179 data-nosnippet>179</a> BigInt::from(n <span class="kw">as </span>u64)
<a href=#180 id=180 data-nosnippet>180</a> } <span class="kw">else </span>{
<a href=#181 id=181 data-nosnippet>181</a> <span class="kw">let </span>u = u64::MAX - (n <span class="kw">as </span>u64) + <span class="number">1</span>;
<a href=#182 id=182 data-nosnippet>182</a> BigInt {
<a href=#183 id=183 data-nosnippet>183</a> sign: Minus,
<a href=#184 id=184 data-nosnippet>184</a> data: BigUint::from(u),
<a href=#185 id=185 data-nosnippet>185</a> }
<a href=#186 id=186 data-nosnippet>186</a> }
<a href=#187 id=187 data-nosnippet>187</a> }
<a href=#188 id=188 data-nosnippet>188</a>}
<a href=#189 id=189 data-nosnippet>189</a>
<a href=#190 id=190 data-nosnippet>190</a><span class="kw">impl </span>From&lt;i128&gt; <span class="kw">for </span>BigInt {
<a href=#191 id=191 data-nosnippet>191</a> <span class="attr">#[inline]
<a href=#192 id=192 data-nosnippet>192</a> </span><span class="kw">fn </span>from(n: i128) -&gt; <span class="self">Self </span>{
<a href=#193 id=193 data-nosnippet>193</a> <span class="kw">if </span>n &gt;= <span class="number">0 </span>{
<a href=#194 id=194 data-nosnippet>194</a> BigInt::from(n <span class="kw">as </span>u128)
<a href=#195 id=195 data-nosnippet>195</a> } <span class="kw">else </span>{
<a href=#196 id=196 data-nosnippet>196</a> <span class="kw">let </span>u = u128::MAX - (n <span class="kw">as </span>u128) + <span class="number">1</span>;
<a href=#197 id=197 data-nosnippet>197</a> BigInt {
<a href=#198 id=198 data-nosnippet>198</a> sign: Minus,
<a href=#199 id=199 data-nosnippet>199</a> data: BigUint::from(u),
<a href=#200 id=200 data-nosnippet>200</a> }
<a href=#201 id=201 data-nosnippet>201</a> }
<a href=#202 id=202 data-nosnippet>202</a> }
<a href=#203 id=203 data-nosnippet>203</a>}
<a href=#204 id=204 data-nosnippet>204</a>
<a href=#205 id=205 data-nosnippet>205</a><span class="macro">macro_rules!</span> impl_bigint_from_int {
<a href=#206 id=206 data-nosnippet>206</a> (<span class="macro-nonterminal">$T</span>:ty) =&gt; {
<a href=#207 id=207 data-nosnippet>207</a> <span class="kw">impl </span>From&lt;<span class="macro-nonterminal">$T</span>&gt; <span class="kw">for </span>BigInt {
<a href=#208 id=208 data-nosnippet>208</a> <span class="attr">#[inline]
<a href=#209 id=209 data-nosnippet>209</a> </span><span class="kw">fn </span>from(n: <span class="macro-nonterminal">$T</span>) -&gt; <span class="self">Self </span>{
<a href=#210 id=210 data-nosnippet>210</a> BigInt::from(n <span class="kw">as </span>i64)
<a href=#211 id=211 data-nosnippet>211</a> }
<a href=#212 id=212 data-nosnippet>212</a> }
<a href=#213 id=213 data-nosnippet>213</a> };
<a href=#214 id=214 data-nosnippet>214</a>}
<a href=#215 id=215 data-nosnippet>215</a>
<a href=#216 id=216 data-nosnippet>216</a><span class="macro">impl_bigint_from_int!</span>(i8);
<a href=#217 id=217 data-nosnippet>217</a><span class="macro">impl_bigint_from_int!</span>(i16);
<a href=#218 id=218 data-nosnippet>218</a><span class="macro">impl_bigint_from_int!</span>(i32);
<a href=#219 id=219 data-nosnippet>219</a><span class="macro">impl_bigint_from_int!</span>(isize);
<a href=#220 id=220 data-nosnippet>220</a>
<a href=#221 id=221 data-nosnippet>221</a><span class="kw">impl </span>From&lt;u64&gt; <span class="kw">for </span>BigInt {
<a href=#222 id=222 data-nosnippet>222</a> <span class="attr">#[inline]
<a href=#223 id=223 data-nosnippet>223</a> </span><span class="kw">fn </span>from(n: u64) -&gt; <span class="self">Self </span>{
<a href=#224 id=224 data-nosnippet>224</a> <span class="kw">if </span>n &gt; <span class="number">0 </span>{
<a href=#225 id=225 data-nosnippet>225</a> BigInt {
<a href=#226 id=226 data-nosnippet>226</a> sign: Plus,
<a href=#227 id=227 data-nosnippet>227</a> data: BigUint::from(n),
<a href=#228 id=228 data-nosnippet>228</a> }
<a href=#229 id=229 data-nosnippet>229</a> } <span class="kw">else </span>{
<a href=#230 id=230 data-nosnippet>230</a> <span class="self">Self</span>::ZERO
<a href=#231 id=231 data-nosnippet>231</a> }
<a href=#232 id=232 data-nosnippet>232</a> }
<a href=#233 id=233 data-nosnippet>233</a>}
<a href=#234 id=234 data-nosnippet>234</a>
<a href=#235 id=235 data-nosnippet>235</a><span class="kw">impl </span>From&lt;u128&gt; <span class="kw">for </span>BigInt {
<a href=#236 id=236 data-nosnippet>236</a> <span class="attr">#[inline]
<a href=#237 id=237 data-nosnippet>237</a> </span><span class="kw">fn </span>from(n: u128) -&gt; <span class="self">Self </span>{
<a href=#238 id=238 data-nosnippet>238</a> <span class="kw">if </span>n &gt; <span class="number">0 </span>{
<a href=#239 id=239 data-nosnippet>239</a> BigInt {
<a href=#240 id=240 data-nosnippet>240</a> sign: Plus,
<a href=#241 id=241 data-nosnippet>241</a> data: BigUint::from(n),
<a href=#242 id=242 data-nosnippet>242</a> }
<a href=#243 id=243 data-nosnippet>243</a> } <span class="kw">else </span>{
<a href=#244 id=244 data-nosnippet>244</a> <span class="self">Self</span>::ZERO
<a href=#245 id=245 data-nosnippet>245</a> }
<a href=#246 id=246 data-nosnippet>246</a> }
<a href=#247 id=247 data-nosnippet>247</a>}
<a href=#248 id=248 data-nosnippet>248</a>
<a href=#249 id=249 data-nosnippet>249</a><span class="macro">macro_rules!</span> impl_bigint_from_uint {
<a href=#250 id=250 data-nosnippet>250</a> (<span class="macro-nonterminal">$T</span>:ty) =&gt; {
<a href=#251 id=251 data-nosnippet>251</a> <span class="kw">impl </span>From&lt;<span class="macro-nonterminal">$T</span>&gt; <span class="kw">for </span>BigInt {
<a href=#252 id=252 data-nosnippet>252</a> <span class="attr">#[inline]
<a href=#253 id=253 data-nosnippet>253</a> </span><span class="kw">fn </span>from(n: <span class="macro-nonterminal">$T</span>) -&gt; <span class="self">Self </span>{
<a href=#254 id=254 data-nosnippet>254</a> BigInt::from(n <span class="kw">as </span>u64)
<a href=#255 id=255 data-nosnippet>255</a> }
<a href=#256 id=256 data-nosnippet>256</a> }
<a href=#257 id=257 data-nosnippet>257</a> };
<a href=#258 id=258 data-nosnippet>258</a>}
<a href=#259 id=259 data-nosnippet>259</a>
<a href=#260 id=260 data-nosnippet>260</a><span class="macro">impl_bigint_from_uint!</span>(u8);
<a href=#261 id=261 data-nosnippet>261</a><span class="macro">impl_bigint_from_uint!</span>(u16);
<a href=#262 id=262 data-nosnippet>262</a><span class="macro">impl_bigint_from_uint!</span>(u32);
<a href=#263 id=263 data-nosnippet>263</a><span class="macro">impl_bigint_from_uint!</span>(usize);
<a href=#264 id=264 data-nosnippet>264</a>
<a href=#265 id=265 data-nosnippet>265</a><span class="kw">impl </span>From&lt;BigUint&gt; <span class="kw">for </span>BigInt {
<a href=#266 id=266 data-nosnippet>266</a> <span class="attr">#[inline]
<a href=#267 id=267 data-nosnippet>267</a> </span><span class="kw">fn </span>from(n: BigUint) -&gt; <span class="self">Self </span>{
<a href=#268 id=268 data-nosnippet>268</a> <span class="kw">if </span>n.is_zero() {
<a href=#269 id=269 data-nosnippet>269</a> <span class="self">Self</span>::ZERO
<a href=#270 id=270 data-nosnippet>270</a> } <span class="kw">else </span>{
<a href=#271 id=271 data-nosnippet>271</a> BigInt {
<a href=#272 id=272 data-nosnippet>272</a> sign: Plus,
<a href=#273 id=273 data-nosnippet>273</a> data: n,
<a href=#274 id=274 data-nosnippet>274</a> }
<a href=#275 id=275 data-nosnippet>275</a> }
<a href=#276 id=276 data-nosnippet>276</a> }
<a href=#277 id=277 data-nosnippet>277</a>}
<a href=#278 id=278 data-nosnippet>278</a>
<a href=#279 id=279 data-nosnippet>279</a><span class="kw">impl </span>ToBigInt <span class="kw">for </span>BigInt {
<a href=#280 id=280 data-nosnippet>280</a> <span class="attr">#[inline]
<a href=#281 id=281 data-nosnippet>281</a> </span><span class="kw">fn </span>to_bigint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#282 id=282 data-nosnippet>282</a> <span class="prelude-val">Some</span>(<span class="self">self</span>.clone())
<a href=#283 id=283 data-nosnippet>283</a> }
<a href=#284 id=284 data-nosnippet>284</a>}
<a href=#285 id=285 data-nosnippet>285</a>
<a href=#286 id=286 data-nosnippet>286</a><span class="kw">impl </span>ToBigInt <span class="kw">for </span>BigUint {
<a href=#287 id=287 data-nosnippet>287</a> <span class="attr">#[inline]
<a href=#288 id=288 data-nosnippet>288</a> </span><span class="kw">fn </span>to_bigint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#289 id=289 data-nosnippet>289</a> <span class="kw">if </span><span class="self">self</span>.is_zero() {
<a href=#290 id=290 data-nosnippet>290</a> <span class="prelude-val">Some</span>(BigInt::ZERO)
<a href=#291 id=291 data-nosnippet>291</a> } <span class="kw">else </span>{
<a href=#292 id=292 data-nosnippet>292</a> <span class="prelude-val">Some</span>(BigInt {
<a href=#293 id=293 data-nosnippet>293</a> sign: Plus,
<a href=#294 id=294 data-nosnippet>294</a> data: <span class="self">self</span>.clone(),
<a href=#295 id=295 data-nosnippet>295</a> })
<a href=#296 id=296 data-nosnippet>296</a> }
<a href=#297 id=297 data-nosnippet>297</a> }
<a href=#298 id=298 data-nosnippet>298</a>}
<a href=#299 id=299 data-nosnippet>299</a>
<a href=#300 id=300 data-nosnippet>300</a><span class="kw">impl </span>ToBigUint <span class="kw">for </span>BigInt {
<a href=#301 id=301 data-nosnippet>301</a> <span class="attr">#[inline]
<a href=#302 id=302 data-nosnippet>302</a> </span><span class="kw">fn </span>to_biguint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;BigUint&gt; {
<a href=#303 id=303 data-nosnippet>303</a> <span class="kw">match </span><span class="self">self</span>.sign() {
<a href=#304 id=304 data-nosnippet>304</a> Plus =&gt; <span class="prelude-val">Some</span>(<span class="self">self</span>.data.clone()),
<a href=#305 id=305 data-nosnippet>305</a> NoSign =&gt; <span class="prelude-val">Some</span>(BigUint::ZERO),
<a href=#306 id=306 data-nosnippet>306</a> Minus =&gt; <span class="prelude-val">None</span>,
<a href=#307 id=307 data-nosnippet>307</a> }
<a href=#308 id=308 data-nosnippet>308</a> }
<a href=#309 id=309 data-nosnippet>309</a>}
<a href=#310 id=310 data-nosnippet>310</a>
<a href=#311 id=311 data-nosnippet>311</a><span class="kw">impl </span>TryFrom&lt;<span class="kw-2">&amp;</span>BigInt&gt; <span class="kw">for </span>BigUint {
<a href=#312 id=312 data-nosnippet>312</a> <span class="kw">type </span>Error = TryFromBigIntError&lt;()&gt;;
<a href=#313 id=313 data-nosnippet>313</a>
<a href=#314 id=314 data-nosnippet>314</a> <span class="attr">#[inline]
<a href=#315 id=315 data-nosnippet>315</a> </span><span class="kw">fn </span>try_from(value: <span class="kw-2">&amp;</span>BigInt) -&gt; <span class="prelude-ty">Result</span>&lt;BigUint, TryFromBigIntError&lt;()&gt;&gt; {
<a href=#316 id=316 data-nosnippet>316</a> value
<a href=#317 id=317 data-nosnippet>317</a> .to_biguint()
<a href=#318 id=318 data-nosnippet>318</a> .ok_or_else(|| TryFromBigIntError::new(()))
<a href=#319 id=319 data-nosnippet>319</a> }
<a href=#320 id=320 data-nosnippet>320</a>}
<a href=#321 id=321 data-nosnippet>321</a>
<a href=#322 id=322 data-nosnippet>322</a><span class="kw">impl </span>TryFrom&lt;BigInt&gt; <span class="kw">for </span>BigUint {
<a href=#323 id=323 data-nosnippet>323</a> <span class="kw">type </span>Error = TryFromBigIntError&lt;BigInt&gt;;
<a href=#324 id=324 data-nosnippet>324</a>
<a href=#325 id=325 data-nosnippet>325</a> <span class="attr">#[inline]
<a href=#326 id=326 data-nosnippet>326</a> </span><span class="kw">fn </span>try_from(value: BigInt) -&gt; <span class="prelude-ty">Result</span>&lt;BigUint, TryFromBigIntError&lt;BigInt&gt;&gt; {
<a href=#327 id=327 data-nosnippet>327</a> <span class="kw">if </span>value.sign() == Sign::Minus {
<a href=#328 id=328 data-nosnippet>328</a> <span class="prelude-val">Err</span>(TryFromBigIntError::new(value))
<a href=#329 id=329 data-nosnippet>329</a> } <span class="kw">else </span>{
<a href=#330 id=330 data-nosnippet>330</a> <span class="prelude-val">Ok</span>(value.data)
<a href=#331 id=331 data-nosnippet>331</a> }
<a href=#332 id=332 data-nosnippet>332</a> }
<a href=#333 id=333 data-nosnippet>333</a>}
<a href=#334 id=334 data-nosnippet>334</a>
<a href=#335 id=335 data-nosnippet>335</a><span class="macro">macro_rules!</span> impl_to_bigint {
<a href=#336 id=336 data-nosnippet>336</a> (<span class="macro-nonterminal">$T</span>:ty, <span class="macro-nonterminal">$from_ty</span>:path) =&gt; {
<a href=#337 id=337 data-nosnippet>337</a> <span class="kw">impl </span>ToBigInt <span class="kw">for </span><span class="macro-nonterminal">$T </span>{
<a href=#338 id=338 data-nosnippet>338</a> <span class="attr">#[inline]
<a href=#339 id=339 data-nosnippet>339</a> </span><span class="kw">fn </span>to_bigint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;BigInt&gt; {
<a href=#340 id=340 data-nosnippet>340</a> <span class="macro-nonterminal">$from_ty</span>(<span class="kw-2">*</span><span class="self">self</span>)
<a href=#341 id=341 data-nosnippet>341</a> }
<a href=#342 id=342 data-nosnippet>342</a> }
<a href=#343 id=343 data-nosnippet>343</a> };
<a href=#344 id=344 data-nosnippet>344</a>}
<a href=#345 id=345 data-nosnippet>345</a>
<a href=#346 id=346 data-nosnippet>346</a><span class="macro">impl_to_bigint!</span>(isize, FromPrimitive::from_isize);
<a href=#347 id=347 data-nosnippet>347</a><span class="macro">impl_to_bigint!</span>(i8, FromPrimitive::from_i8);
<a href=#348 id=348 data-nosnippet>348</a><span class="macro">impl_to_bigint!</span>(i16, FromPrimitive::from_i16);
<a href=#349 id=349 data-nosnippet>349</a><span class="macro">impl_to_bigint!</span>(i32, FromPrimitive::from_i32);
<a href=#350 id=350 data-nosnippet>350</a><span class="macro">impl_to_bigint!</span>(i64, FromPrimitive::from_i64);
<a href=#351 id=351 data-nosnippet>351</a><span class="macro">impl_to_bigint!</span>(i128, FromPrimitive::from_i128);
<a href=#352 id=352 data-nosnippet>352</a>
<a href=#353 id=353 data-nosnippet>353</a><span class="macro">impl_to_bigint!</span>(usize, FromPrimitive::from_usize);
<a href=#354 id=354 data-nosnippet>354</a><span class="macro">impl_to_bigint!</span>(u8, FromPrimitive::from_u8);
<a href=#355 id=355 data-nosnippet>355</a><span class="macro">impl_to_bigint!</span>(u16, FromPrimitive::from_u16);
<a href=#356 id=356 data-nosnippet>356</a><span class="macro">impl_to_bigint!</span>(u32, FromPrimitive::from_u32);
<a href=#357 id=357 data-nosnippet>357</a><span class="macro">impl_to_bigint!</span>(u64, FromPrimitive::from_u64);
<a href=#358 id=358 data-nosnippet>358</a><span class="macro">impl_to_bigint!</span>(u128, FromPrimitive::from_u128);
<a href=#359 id=359 data-nosnippet>359</a>
<a href=#360 id=360 data-nosnippet>360</a><span class="macro">impl_to_bigint!</span>(f32, FromPrimitive::from_f32);
<a href=#361 id=361 data-nosnippet>361</a><span class="macro">impl_to_bigint!</span>(f64, FromPrimitive::from_f64);
<a href=#362 id=362 data-nosnippet>362</a>
<a href=#363 id=363 data-nosnippet>363</a><span class="kw">impl </span>From&lt;bool&gt; <span class="kw">for </span>BigInt {
<a href=#364 id=364 data-nosnippet>364</a> <span class="kw">fn </span>from(x: bool) -&gt; <span class="self">Self </span>{
<a href=#365 id=365 data-nosnippet>365</a> <span class="kw">if </span>x {
<a href=#366 id=366 data-nosnippet>366</a> One::one()
<a href=#367 id=367 data-nosnippet>367</a> } <span class="kw">else </span>{
<a href=#368 id=368 data-nosnippet>368</a> <span class="self">Self</span>::ZERO
<a href=#369 id=369 data-nosnippet>369</a> }
<a href=#370 id=370 data-nosnippet>370</a> }
<a href=#371 id=371 data-nosnippet>371</a>}
<a href=#372 id=372 data-nosnippet>372</a>
<a href=#373 id=373 data-nosnippet>373</a><span class="attr">#[inline]
<a href=#374 id=374 data-nosnippet>374</a></span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_signed_bytes_be(digits: <span class="kw-2">&amp;</span>[u8]) -&gt; BigInt {
<a href=#375 id=375 data-nosnippet>375</a> <span class="kw">let </span>sign = <span class="kw">match </span>digits.first() {
<a href=#376 id=376 data-nosnippet>376</a> <span class="prelude-val">Some</span>(v) <span class="kw">if </span><span class="kw-2">*</span>v &gt; <span class="number">0x7f </span>=&gt; Sign::Minus,
<a href=#377 id=377 data-nosnippet>377</a> <span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; Sign::Plus,
<a href=#378 id=378 data-nosnippet>378</a> <span class="prelude-val">None </span>=&gt; <span class="kw">return </span>BigInt::ZERO,
<a href=#379 id=379 data-nosnippet>379</a> };
<a href=#380 id=380 data-nosnippet>380</a>
<a href=#381 id=381 data-nosnippet>381</a> <span class="kw">if </span>sign == Sign::Minus {
<a href=#382 id=382 data-nosnippet>382</a> <span class="comment">// two's-complement the content to retrieve the magnitude
<a href=#383 id=383 data-nosnippet>383</a> </span><span class="kw">let </span><span class="kw-2">mut </span>digits = Vec::from(digits);
<a href=#384 id=384 data-nosnippet>384</a> twos_complement_be(<span class="kw-2">&amp;mut </span>digits);
<a href=#385 id=385 data-nosnippet>385</a> BigInt::from_biguint(sign, BigUint::from_bytes_be(<span class="kw-2">&amp;</span>digits))
<a href=#386 id=386 data-nosnippet>386</a> } <span class="kw">else </span>{
<a href=#387 id=387 data-nosnippet>387</a> BigInt::from_biguint(sign, BigUint::from_bytes_be(digits))
<a href=#388 id=388 data-nosnippet>388</a> }
<a href=#389 id=389 data-nosnippet>389</a>}
<a href=#390 id=390 data-nosnippet>390</a>
<a href=#391 id=391 data-nosnippet>391</a><span class="attr">#[inline]
<a href=#392 id=392 data-nosnippet>392</a></span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_signed_bytes_le(digits: <span class="kw-2">&amp;</span>[u8]) -&gt; BigInt {
<a href=#393 id=393 data-nosnippet>393</a> <span class="kw">let </span>sign = <span class="kw">match </span>digits.last() {
<a href=#394 id=394 data-nosnippet>394</a> <span class="prelude-val">Some</span>(v) <span class="kw">if </span><span class="kw-2">*</span>v &gt; <span class="number">0x7f </span>=&gt; Sign::Minus,
<a href=#395 id=395 data-nosnippet>395</a> <span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; Sign::Plus,
<a href=#396 id=396 data-nosnippet>396</a> <span class="prelude-val">None </span>=&gt; <span class="kw">return </span>BigInt::ZERO,
<a href=#397 id=397 data-nosnippet>397</a> };
<a href=#398 id=398 data-nosnippet>398</a>
<a href=#399 id=399 data-nosnippet>399</a> <span class="kw">if </span>sign == Sign::Minus {
<a href=#400 id=400 data-nosnippet>400</a> <span class="comment">// two's-complement the content to retrieve the magnitude
<a href=#401 id=401 data-nosnippet>401</a> </span><span class="kw">let </span><span class="kw-2">mut </span>digits = Vec::from(digits);
<a href=#402 id=402 data-nosnippet>402</a> twos_complement_le(<span class="kw-2">&amp;mut </span>digits);
<a href=#403 id=403 data-nosnippet>403</a> BigInt::from_biguint(sign, BigUint::from_bytes_le(<span class="kw-2">&amp;</span>digits))
<a href=#404 id=404 data-nosnippet>404</a> } <span class="kw">else </span>{
<a href=#405 id=405 data-nosnippet>405</a> BigInt::from_biguint(sign, BigUint::from_bytes_le(digits))
<a href=#406 id=406 data-nosnippet>406</a> }
<a href=#407 id=407 data-nosnippet>407</a>}
<a href=#408 id=408 data-nosnippet>408</a>
<a href=#409 id=409 data-nosnippet>409</a><span class="attr">#[inline]
<a href=#410 id=410 data-nosnippet>410</a></span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>to_signed_bytes_be(x: <span class="kw-2">&amp;</span>BigInt) -&gt; Vec&lt;u8&gt; {
<a href=#411 id=411 data-nosnippet>411</a> <span class="kw">let </span><span class="kw-2">mut </span>bytes = x.data.to_bytes_be();
<a href=#412 id=412 data-nosnippet>412</a> <span class="kw">let </span>first_byte = bytes.first().cloned().unwrap_or(<span class="number">0</span>);
<a href=#413 id=413 data-nosnippet>413</a> <span class="kw">if </span>first_byte &gt; <span class="number">0x7f
<a href=#414 id=414 data-nosnippet>414</a> </span>&amp;&amp; !(first_byte == <span class="number">0x80 </span>&amp;&amp; bytes.iter().skip(<span class="number">1</span>).all(Zero::is_zero) &amp;&amp; x.sign == Sign::Minus)
<a href=#415 id=415 data-nosnippet>415</a> {
<a href=#416 id=416 data-nosnippet>416</a> <span class="comment">// msb used by magnitude, extend by 1 byte
<a href=#417 id=417 data-nosnippet>417</a> </span>bytes.insert(<span class="number">0</span>, <span class="number">0</span>);
<a href=#418 id=418 data-nosnippet>418</a> }
<a href=#419 id=419 data-nosnippet>419</a> <span class="kw">if </span>x.sign == Sign::Minus {
<a href=#420 id=420 data-nosnippet>420</a> twos_complement_be(<span class="kw-2">&amp;mut </span>bytes);
<a href=#421 id=421 data-nosnippet>421</a> }
<a href=#422 id=422 data-nosnippet>422</a> bytes
<a href=#423 id=423 data-nosnippet>423</a>}
<a href=#424 id=424 data-nosnippet>424</a>
<a href=#425 id=425 data-nosnippet>425</a><span class="attr">#[inline]
<a href=#426 id=426 data-nosnippet>426</a></span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>to_signed_bytes_le(x: <span class="kw-2">&amp;</span>BigInt) -&gt; Vec&lt;u8&gt; {
<a href=#427 id=427 data-nosnippet>427</a> <span class="kw">let </span><span class="kw-2">mut </span>bytes = x.data.to_bytes_le();
<a href=#428 id=428 data-nosnippet>428</a> <span class="kw">let </span>last_byte = bytes.last().cloned().unwrap_or(<span class="number">0</span>);
<a href=#429 id=429 data-nosnippet>429</a> <span class="kw">if </span>last_byte &gt; <span class="number">0x7f
<a href=#430 id=430 data-nosnippet>430</a> </span>&amp;&amp; !(last_byte == <span class="number">0x80
<a href=#431 id=431 data-nosnippet>431</a> </span>&amp;&amp; bytes.iter().rev().skip(<span class="number">1</span>).all(Zero::is_zero)
<a href=#432 id=432 data-nosnippet>432</a> &amp;&amp; x.sign == Sign::Minus)
<a href=#433 id=433 data-nosnippet>433</a> {
<a href=#434 id=434 data-nosnippet>434</a> <span class="comment">// msb used by magnitude, extend by 1 byte
<a href=#435 id=435 data-nosnippet>435</a> </span>bytes.push(<span class="number">0</span>);
<a href=#436 id=436 data-nosnippet>436</a> }
<a href=#437 id=437 data-nosnippet>437</a> <span class="kw">if </span>x.sign == Sign::Minus {
<a href=#438 id=438 data-nosnippet>438</a> twos_complement_le(<span class="kw-2">&amp;mut </span>bytes);
<a href=#439 id=439 data-nosnippet>439</a> }
<a href=#440 id=440 data-nosnippet>440</a> bytes
<a href=#441 id=441 data-nosnippet>441</a>}
<a href=#442 id=442 data-nosnippet>442</a>
<a href=#443 id=443 data-nosnippet>443</a><span class="doccomment">/// Perform in-place two's complement of the given binary representation,
<a href=#444 id=444 data-nosnippet>444</a>/// in little-endian byte order.
<a href=#445 id=445 data-nosnippet>445</a></span><span class="attr">#[inline]
<a href=#446 id=446 data-nosnippet>446</a></span><span class="kw">fn </span>twos_complement_le(digits: <span class="kw-2">&amp;mut </span>[u8]) {
<a href=#447 id=447 data-nosnippet>447</a> twos_complement(digits)
<a href=#448 id=448 data-nosnippet>448</a>}
<a href=#449 id=449 data-nosnippet>449</a>
<a href=#450 id=450 data-nosnippet>450</a><span class="doccomment">/// Perform in-place two's complement of the given binary representation
<a href=#451 id=451 data-nosnippet>451</a>/// in big-endian byte order.
<a href=#452 id=452 data-nosnippet>452</a></span><span class="attr">#[inline]
<a href=#453 id=453 data-nosnippet>453</a></span><span class="kw">fn </span>twos_complement_be(digits: <span class="kw-2">&amp;mut </span>[u8]) {
<a href=#454 id=454 data-nosnippet>454</a> twos_complement(digits.iter_mut().rev())
<a href=#455 id=455 data-nosnippet>455</a>}
<a href=#456 id=456 data-nosnippet>456</a>
<a href=#457 id=457 data-nosnippet>457</a><span class="doccomment">/// Perform in-place two's complement of the given digit iterator
<a href=#458 id=458 data-nosnippet>458</a>/// starting from the least significant byte.
<a href=#459 id=459 data-nosnippet>459</a></span><span class="attr">#[inline]
<a href=#460 id=460 data-nosnippet>460</a></span><span class="kw">fn </span>twos_complement&lt;<span class="lifetime">'a</span>, I&gt;(digits: I)
<a href=#461 id=461 data-nosnippet>461</a><span class="kw">where
<a href=#462 id=462 data-nosnippet>462</a> </span>I: IntoIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>u8&gt;,
<a href=#463 id=463 data-nosnippet>463</a>{
<a href=#464 id=464 data-nosnippet>464</a> <span class="kw">let </span><span class="kw-2">mut </span>carry = <span class="bool-val">true</span>;
<a href=#465 id=465 data-nosnippet>465</a> <span class="kw">for </span>d <span class="kw">in </span>digits {
<a href=#466 id=466 data-nosnippet>466</a> <span class="kw-2">*</span>d = !<span class="kw-2">*</span>d;
<a href=#467 id=467 data-nosnippet>467</a> <span class="kw">if </span>carry {
<a href=#468 id=468 data-nosnippet>468</a> <span class="kw-2">*</span>d = d.wrapping_add(<span class="number">1</span>);
<a href=#469 id=469 data-nosnippet>469</a> carry = d.is_zero();
<a href=#470 id=470 data-nosnippet>470</a> }
<a href=#471 id=471 data-nosnippet>471</a> }
<a href=#472 id=472 data-nosnippet>472</a>}
</code></pre></div></section></main></body></html>