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<li class="navelem"><a class="el" href="dir_90ffdbabf412cfdffe6b2193e0ce938a.html">libxrpl</a></li><li class="navelem"><a class="el" href="dir_4cb643486f27a568a0d40f174f670f35.html">protocol</a></li> </ul>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//------------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">/*</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> Copyright (c) 2012, 2013 Ripple Labs Inc.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"></span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"></span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">*/</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">//==============================================================================</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">//</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">/* The base58 encoding &amp; decoding routines in the b58_ref namespace are taken</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment"> * from Bitcoin but have been modified from the original.</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"> *</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment"> * Copyright (c) 2014 The Bitcoin Core developers</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment"> * Distributed under the MIT software license, see the accompanying</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment"> * file COPYING or http://www.opensource.org/licenses/mit-license.php.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment"> */</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include &lt;xrpl/basics/Expected.h&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include &lt;xrpl/basics/safe_cast.h&gt;</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include &lt;xrpl/beast/utility/instrumentation.h&gt;</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include &lt;xrpl/protocol/detail/b58_utils.h&gt;</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include &lt;xrpl/protocol/detail/token_errors.h&gt;</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="preprocessor">#include &lt;xrpl/protocol/digest.h&gt;</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="preprocessor">#include &lt;xrpl/protocol/tokens.h&gt;</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#include &lt;boost/container/small_vector.hpp&gt;</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="preprocessor">#include &lt;boost/endian/conversion.hpp&gt;</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/algorithm.html">algorithm</a>&gt;</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/array.html">array</a>&gt;</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstdint.html">cstdint</a>&gt;</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstring.html">cstring</a>&gt;</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/span.html">span</a>&gt;</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/string.html">string</a>&gt;</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/string_view.html">string_view</a>&gt;</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a>&gt;</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/vector.html">vector</a>&gt;</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">/*</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">Converting between bases is straight forward. First, some background:</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment"></span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">Given the coefficients C[m], ... ,C[0] and base B, those coefficients represent</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">the number C[m]*B^m + ... + C[0]*B^0; The following pseudo-code converts the</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">coefficients to the (infinite precision) integer N:</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment"></span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">```</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">N = 0;</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">i = m ;; N.B. m is the index of the largest coefficient</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">while (i&gt;=0)</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment"> N = N + C[i]*B^i</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment"> i = i - 1</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">```</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment"></span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">For example, in base 10, the number 437 represents the integer 4*10^2 + 3*10^1 +</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">7*10^0. In base 16, 437 is the same as 4*16^2 + 3*16^1 + 7*16^0.</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment"></span> </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">To find the coefficients that represent the integer N in base B, we start by</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">computing the lowest order coefficients and work up to the highest order</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">coefficients. The following pseudo-code converts the (infinite precision)</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">integer N to the correct coefficients:</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment"></span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">```</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">i = 0</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">while(N)</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment"> C[i] = N mod B</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment"> N = floor(N/B)</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment"> i = i + 1</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">```</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment"></span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">For example, to find the coefficients of the integer 437 in base 10:</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment"></span> </div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="comment">C[0] is 437 mod 10; C[0] = 7;</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">N is floor(437/10); N = 43;</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">C[1] is 43 mod 10; C[1] = 3;</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="comment">N is floor(43/10); N = 4;</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment">C[2] is 4 mod 10; C[2] = 4;</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">N is floor(4/10); N = 0;</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">Since N is 0, the algorithm stops.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment"></span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment"></span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">To convert between a number represented with coefficients from base B1 to that</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">same number represented with coefficients from base B2, we can use the algorithm</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">that converts coefficients from base B1 to an integer, and then use the</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment">algorithm that converts a number to coefficients from base B2.</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="comment"></span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">There is a useful shortcut that can be used if one of the bases is a power of</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">the other base. If B1 == B2^G, then each coefficient from base B1 can be</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">converted to base B2 independently to create a group of &quot;G&quot; B2 coefficient.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">These coefficients can be simply concatenated together. Since 16 == 2^4, this</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">property is what makes base 16 useful when dealing with binary numbers. For</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="comment">example consider converting the base 16 number &quot;93&quot; to binary. The base 16</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="comment">coefficient 9 is represented in base 2 with the coefficients 1,0,0,1. The base</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">16 coefficient 3 is represented in base 2 with the coefficients 0,0,1,1. To get</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">the final answer, just concatenate those two independent conversions together.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">The base 16 number &quot;93&quot; is the binary number &quot;10010011&quot;.</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment"></span> </div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">The original (now reference) algorithm to convert from base 58 to a binary</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">number used the</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span><span class="comment"></span> </div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="comment">```</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">N = 0;</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">for i in m to 0 inclusive</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment"> N = N + C[i]*B^i</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">```</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment"></span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span><span class="comment">algorithm.</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment"></span> </div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="comment">However, the algorithm above is pseudo-code. In particular, the variable &quot;N&quot; is</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="comment">an infinite precision integer in that pseudo-code. Real computers do</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span><span class="comment">computations on registers, and these registers have limited length. Modern</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span><span class="comment">computers use 64-bit general purpose registers, and can multiply two 64 bit</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span><span class="comment">numbers and obtain a 128 bit result (in two registers).</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="comment"></span> </div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span><span class="comment">The original algorithm in essence converted from base 58 to base 256 (base</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span><span class="comment">2^8). The new, faster algorithm converts from base 58 to base 58^10 (this is</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="comment">fast using the shortcut described above), then from base 58^10 to base 2^64</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span><span class="comment">(this is slow, and requires multi-precision arithmetic), and then from base 2^64</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="comment">to base 2^8 (this is fast, using the shortcut described above). Base 58^10 is</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="comment">chosen because it is the largest power of 58 that will fit into a 64-bit</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span><span class="comment">register.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span><span class="comment"></span> </div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span><span class="comment">While it may seem counter-intuitive that converting from base 58 -&gt; base 58^10</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="comment">-&gt; base 2^64 -&gt; base 2^8 is faster than directly converting from base 58 -&gt; base</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="comment">2^8, it is actually 10x-15x faster. The reason for the speed increase is two of</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="comment">the conversions are trivial (converting between bases where one base is a power</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="comment">of another base), and doing the multi-precision computations with larger</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="comment">coefficients sizes greatly speeds up the multi-precision computations.</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="comment">*/</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"><a class="line" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee"> 142</a></span><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keywordtype">char</span> <span class="keyword">const</span>* <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">alphabetForward</a> =</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="stringliteral">&quot;rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz&quot;</span>;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"><a class="line" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea"> 145</a></span><span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;int, 256&gt;</a> <span class="keyword">const</span> <a class="code hl_variable" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">alphabetReverse</a> = []() {</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;int, 256&gt;</a> map{};</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; m : map)</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> m = -1;</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0, j = 0; <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">alphabetForward</a>[i] != 0; ++i)</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> map[<span class="keyword">static_cast&lt;</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span><span class="keyword">&gt;</span>(<a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">alphabetForward</a>[i])] = j++;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <span class="keywordflow">return</span> map;</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span>}();</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Hasher&gt;</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span><span class="keyword">static</span> <span class="keyword">typename</span> Hasher::result_type</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"><a class="line" href="namespaceripple.html#a91e9fe7a4e92dba79c3812fd3edcaacc"> 156</a></span><a class="code hl_function" href="namespaceripple.html#a91e9fe7a4e92dba79c3812fd3edcaacc">digest</a>(<span class="keywordtype">void</span> <span class="keyword">const</span>* data, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size) <span class="keyword">noexcept</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span>{</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> Hasher h;</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> h(data, size);</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span>typename Hasher::result_type<span class="keyword">&gt;</span>(h);</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span>}</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><span class="keyword">template</span> &lt;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="keyword">class </span>Hasher,</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="keyword">class </span>T,</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> N,</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keyword">class </span>= <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/enable_if.html">std::enable_if_t</a>&lt;<span class="keyword">sizeof</span>(T) == 1&gt;&gt;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span><span class="keyword">static</span> <span class="keyword">typename</span> Hasher::result_type</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"><a class="line" href="namespaceripple.html#aa7ab589b7476d6c8d2fc9ae8c72d38be"> 169</a></span><a class="code hl_function" href="namespaceripple.html#a91e9fe7a4e92dba79c3812fd3edcaacc">digest</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;T, N&gt;</a> <span class="keyword">const</span>&amp; v)</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span>{</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="keywordflow">return</span> digest&lt;Hasher&gt;(v.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), v.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>());</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span>}</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> </div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span><span class="comment">// Computes a double digest (e.g. digest of the digest)</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="keyword">template</span> &lt;<span class="keyword">class </span>Hasher, <span class="keyword">class</span>... Args&gt;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="keyword">static</span> <span class="keyword">typename</span> Hasher::result_type</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"><a class="line" href="namespaceripple.html#acd04261400a2d3beb5986da2e26ed0b4"> 177</a></span><a class="code hl_function" href="namespaceripple.html#acd04261400a2d3beb5986da2e26ed0b4">digest2</a>(Args <span class="keyword">const</span>&amp;... args)</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span>{</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> <span class="keywordflow">return</span> digest&lt;Hasher&gt;(digest&lt;Hasher&gt;(args...));</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span>}</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"><a class="line" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd"> 192</a></span><a class="code hl_function" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">checksum</a>(<span class="keywordtype">void</span>* <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>, <span class="keywordtype">void</span> <span class="keyword">const</span>* message, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size)</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span>{</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="keyword">auto</span> <span class="keyword">const</span> h = digest2&lt;sha256_hasher&gt;(message, size);</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">std::memcpy</a>(<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>, h.data(), 4);</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span>}</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span>[[nodiscard]] <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"><a class="line" href="namespaceripple.html#a6034aeaa84f60243a837b0ee043e4114"> 199</a></span><a class="code hl_function" href="namespaceripple.html#a6034aeaa84f60243a837b0ee043e4114">encodeBase58Token</a>(<a class="code hl_enumeration" href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">TokenType</a> type, <span class="keywordtype">void</span> <span class="keyword">const</span>* token, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size)</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span>{</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="preprocessor">#ifndef _MSC_VER</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> <span class="keywordflow">return</span> b58_fast::encodeBase58Token(type, token, size);</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple_1_1b58__ref.html#aa0fa3cba7987f0ba4579070b2d4bba8d">b58_ref::encodeBase58Token</a>(type, token, size);</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span>}</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span>[[nodiscard]] <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"><a class="line" href="namespaceripple.html#a791e5b51e5921b1070bc195ba2959f3e"> 209</a></span><a class="code hl_function" href="namespaceripple.html#a791e5b51e5921b1070bc195ba2959f3e">decodeBase58Token</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> <span class="keyword">const</span>&amp; s, <a class="code hl_enumeration" href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">TokenType</a> type)</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span>{</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="preprocessor">#ifndef _MSC_VER</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> <span class="keywordflow">return</span> b58_fast::decodeBase58Token(s, type);</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple_1_1b58__ref.html#ac05a3902d978e135ba7ad0bef1e4b89e">b58_ref::decodeBase58Token</a>(s, type);</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span>}</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span><span class="keyword">namespace </span>b58_ref {</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> </div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"><a class="line" href="namespaceripple_1_1b58__ref_1_1detail.html#ab0b27e0b4489431b8cb8f5ff8276a6ac"> 223</a></span><a class="code hl_function" href="namespaceripple_1_1b58__ref_1_1detail.html#ab0b27e0b4489431b8cb8f5ff8276a6ac">encodeBase58</a>(</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> <span class="keywordtype">void</span> <span class="keyword">const</span>* message,</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size,</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> <span class="keywordtype">void</span>* temp,</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> temp_size)</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span>{</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> <span class="keyword">auto</span> pbegin = <span class="keyword">reinterpret_cast&lt;</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> const*<span class="keyword">&gt;</span>(message);</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> <span class="keyword">auto</span> <span class="keyword">const</span> pend = pbegin + size;</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> </div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span> <span class="comment">// Skip &amp; count leading zeroes.</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span> <span class="keywordtype">int</span> zeroes = 0;</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span> <span class="keywordflow">while</span> (pbegin != pend &amp;&amp; *pbegin == 0)</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span> {</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> pbegin++;</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> zeroes++;</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> }</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span> <span class="keyword">auto</span> <span class="keyword">const</span> b58begin = <span class="keyword">reinterpret_cast&lt;</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*<span class="keyword">&gt;</span>(temp);</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span> <span class="keyword">auto</span> <span class="keyword">const</span> b58end = b58begin + temp_size;</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span> </div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/fill.html">std::fill</a>(b58begin, b58end, 0);</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span> </div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> <span class="keywordflow">while</span> (pbegin != pend)</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> {</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> <span class="keywordtype">int</span> carry = *pbegin;</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span> <span class="comment">// Apply &quot;b58 = b58 * 256 + ch&quot;.</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = b58end; iter != b58begin; --iter)</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span> {</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span> carry += 256 * (iter[-1]);</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span> iter[-1] = carry % 58;</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span> carry /= 58;</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span> }</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span> XRPL_ASSERT(</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span> carry == 0, <span class="stringliteral">&quot;ripple::b58_ref::detail::encodeBase58 : zero carry&quot;</span>);</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span> pbegin++;</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span> }</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span> </div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span> <span class="comment">// Skip leading zeroes in base58 result.</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span> <span class="keyword">auto</span> iter = b58begin;</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span> <span class="keywordflow">while</span> (iter != b58end &amp;&amp; *iter == 0)</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span> ++iter;</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span> </div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span> <span class="comment">// Translate the result into a string.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> str;</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span> str.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/reserve.html">reserve</a>(zeroes + (b58end - iter));</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span> str.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/assign.html">assign</a>(zeroes, <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">alphabetForward</a>[0]);</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span> <span class="keywordflow">while</span> (iter != b58end)</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> str += <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">alphabetForward</a>[*(iter++)];</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> <span class="keywordflow">return</span> str;</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span>}</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span> </div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"><a class="line" href="namespaceripple_1_1b58__ref_1_1detail.html#a7228a56fbbce041214ae00bd5d761107"> 275</a></span><a class="code hl_function" href="namespaceripple_1_1b58__ref_1_1detail.html#a7228a56fbbce041214ae00bd5d761107">decodeBase58</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> <span class="keyword">const</span>&amp; s)</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span>{</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span> <span class="keyword">auto</span> psz = <span class="keyword">reinterpret_cast&lt;</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> const*<span class="keyword">&gt;</span>(s.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/c_str.html">c_str</a>());</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span> <span class="keyword">auto</span> remain = s.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>();</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span> <span class="comment">// Skip and count leading zeroes</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span> <span class="keywordtype">int</span> zeroes = 0;</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span> <span class="keywordflow">while</span> (remain &gt; 0 &amp;&amp; <a class="code hl_variable" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">alphabetReverse</a>[*psz] == 0)</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span> {</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span> ++zeroes;</div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> ++psz;</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> --remain;</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span> }</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span> </div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> <span class="keywordflow">if</span> (remain &gt; 64)</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> </div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span> <span class="comment">// Allocate enough space in big-endian base256 representation.</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span> <span class="comment">// log(58) / log(256), rounded up.</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;unsigned char&gt;</a> b256(remain * 733 / 1000 + 1);</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span> <span class="keywordflow">while</span> (remain &gt; 0)</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span> {</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span> <span class="keyword">auto</span> carry = <a class="code hl_variable" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">alphabetReverse</a>[*psz];</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span> <span class="keywordflow">if</span> (carry == -1)</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span> <span class="comment">// Apply &quot;b256 = b256 * 58 + carry&quot;.</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/rbegin.html">rbegin</a>(); iter != b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/rend.html">rend</a>(); ++iter)</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span> {</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span> carry += 58 * *iter;</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span> *iter = carry % 256;</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span> carry /= 256;</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span> }</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span> XRPL_ASSERT(</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span> carry == 0, <span class="stringliteral">&quot;ripple::b58_ref::detail::decodeBase58 : zero carry&quot;</span>);</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span> ++psz;</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span> --remain;</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span> }</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span> <span class="comment">// Skip leading zeroes in b256.</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span> <span class="keyword">auto</span> iter = <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/find.html">std::find_if</a>(</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span> b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/begin.html">begin</a>(), b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/end.html">end</a>(), [](<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c) { return c != 0; });</div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> result;</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span> result.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/reserve.html">reserve</a>(zeroes + (b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/end.html">end</a>() - iter));</div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"> 316</span> result.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/assign.html">assign</a>(zeroes, 0x00);</div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span> <span class="keywordflow">while</span> (iter != b256.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/vector/end.html">end</a>())</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span> result.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/push_back.html">push_back</a>(*(iter++));</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno"> 319</span> <span class="keywordflow">return</span> result;</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span>}</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span> </div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span> </div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"><a class="line" href="namespaceripple_1_1b58__ref.html#aa0fa3cba7987f0ba4579070b2d4bba8d"> 325</a></span><a class="code hl_function" href="namespaceripple_1_1b58__ref.html#aa0fa3cba7987f0ba4579070b2d4bba8d">encodeBase58Token</a>(<a class="code hl_enumeration" href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">TokenType</a> type, <span class="keywordtype">void</span> <span class="keyword">const</span>* token, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size)</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span>{</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span> <span class="comment">// expanded token includes type + 4 byte checksum</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span> <span class="keyword">auto</span> <span class="keyword">const</span> expanded = 1 + size + 4;</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span> </div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span> <span class="comment">// We need expanded + expanded * (log(256) / log(58)) which is</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span> <span class="comment">// bounded by expanded + expanded * (138 / 100 + 1) which works</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span> <span class="comment">// out to expanded * 3:</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span> <span class="keyword">auto</span> <span class="keyword">const</span> bufsize = expanded * 3;</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span> </div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span> boost::container::small_vector&lt;std::uint8_t, 1024&gt; buf(bufsize);</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span> </div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span> <span class="comment">// Lay the data out as</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span> <span class="comment">// &lt;type&gt;&lt;token&gt;&lt;checksum&gt;</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span> buf[0] = safe_cast&lt;std::underlying_type_t&lt;TokenType&gt;&gt;(type);</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span> <span class="keywordflow">if</span> (size)</div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">std::memcpy</a>(buf.data() + 1, token, size);</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span> <a class="code hl_function" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">checksum</a>(buf.data() + 1 + size, buf.data(), 1 + size);</div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span> </div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple_1_1b58__ref_1_1detail.html#ab0b27e0b4489431b8cb8f5ff8276a6ac">detail::encodeBase58</a>(</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span> buf.data(), expanded, buf.data() + expanded, bufsize - expanded);</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span>}</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span> </div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"><a class="line" href="namespaceripple_1_1b58__ref.html#ac05a3902d978e135ba7ad0bef1e4b89e"> 349</a></span><a class="code hl_function" href="namespaceripple_1_1b58__ref.html#ac05a3902d978e135ba7ad0bef1e4b89e">decodeBase58Token</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> <span class="keyword">const</span>&amp; s, <a class="code hl_enumeration" href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">TokenType</a> type)</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span>{</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> <span class="keyword">const</span> ret = <a class="code hl_function" href="namespaceripple_1_1b58__ref_1_1detail.html#a7228a56fbbce041214ae00bd5d761107">detail::decodeBase58</a>(s);</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span> </div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span> <span class="comment">// Reject zero length tokens</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span> <span class="keywordflow">if</span> (ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() &lt; 6)</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span> </div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span> <span class="comment">// The type must match.</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span> <span class="keywordflow">if</span> (type != safe_cast&lt;TokenType&gt;(<span class="keyword">static_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a><span class="keyword">&gt;</span>(ret[0])))</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span> </div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span> <span class="comment">// And the checksum must as well.</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;char, 4&gt;</a> guard;</div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span> <a class="code hl_function" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">checksum</a>(guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/data.html">data</a>(), ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>());</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span> <span class="keywordflow">if</span> (!<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/equal.html">std::equal</a>(guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/rbegin.html">rbegin</a>(), guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/rend.html">rend</a>(), ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/rbegin.html">rbegin</a>()))</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span> </div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span> <span class="comment">// Skip the leading type byte and the trailing checksum.</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span> <span class="keywordflow">return</span> ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/substr.html">substr</a>(1, ret.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - 1 - guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>());</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span>}</div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span>} <span class="comment">// namespace b58_ref</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span> </div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="preprocessor">#ifndef _MSC_VER</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><span class="comment">// The algorithms use gcc&#39;s int128 (fast MS version will have to wait, in the</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="comment">// meantime MS falls back to the slower reference implementation)</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="keyword">namespace </span>b58_fast {</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span><span class="comment">// Note: both the input and output will be BIG ENDIAN</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span>B58Result&lt;std::span&lt;std::uint8_t&gt;&gt;</div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span>b256_to_b58_be(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> input, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> out)</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span>{</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span> <span class="comment">// Max valid input is 38 bytes:</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span> <span class="comment">// (33 bytes for nodepublic + 1 byte token + 4 bytes checksum)</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span> <span class="keywordflow">if</span> (input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() &gt; 38)</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span> {</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span> <span class="keywordflow">return</span> Unexpected(TokenCodecErrc::inputTooLarge);</div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span> };</div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span> </div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span> <span class="keyword">auto</span> count_leading_zeros =</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span> [](<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> <span class="keyword">const</span>&amp; col) -&gt; <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> {</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a> = 0;</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> <span class="keyword">const</span>&amp; c : col)</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span> {</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span> <span class="keywordflow">if</span> (c != 0)</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span> {</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span> <span class="keywordflow">return</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a>;</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span> }</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a> += 1;</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span> }</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span> <span class="keywordflow">return</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a>;</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span> };</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span> </div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span> <span class="keyword">auto</span> <span class="keyword">const</span> input_zeros = count_leading_zeros(input);</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span> input = input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/subspan.html">subspan</a>(input_zeros);</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span> </div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span> <span class="comment">// Allocate enough base 2^64 coeff for encoding 38 bytes</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span> <span class="comment">// log(2^(38*8),2^64)) ~= 4.75. So 5 coeff are enough</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint64_t, 5&gt;</a> base_2_64_coeff_buf{};</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint64_t&gt;</a> <span class="keyword">const</span> base_2_64_coeff =</div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"> 409</span> [&amp;]() -&gt; <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint64_t&gt;</a> {</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span> <span class="comment">// convert input from big endian to native u64, lowest coeff first</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> num_coeff = 0;</div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; base_2_64_coeff_buf.size(); ++i)</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span> {</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span> <span class="keywordflow">if</span> (i * 8 &gt;= input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>())</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span> {</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span> }</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span> <span class="keyword">auto</span> <span class="keyword">const</span> src_i_end = input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() - i * 8;</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span> <span class="keywordflow">if</span> (src_i_end &gt;= 8)</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span> {</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">std::memcpy</a>(</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span> &amp;base_2_64_coeff_buf[num_coeff], &amp;input[src_i_end - 8], 8);</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span> boost::endian::big_to_native_inplace(</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span> base_2_64_coeff_buf[num_coeff]);</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span> }</div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span> {</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> be = 0;</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> bi = 0; bi &lt; src_i_end; ++bi)</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span> {</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span> be &lt;&lt;= 8;</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span> be |= input[bi];</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span> }</div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span> base_2_64_coeff_buf[num_coeff] = be;</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span> };</div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span> num_coeff += 1;</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span> }</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span> <span class="keywordflow">return</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span</a>(base_2_64_coeff_buf.data(), num_coeff);</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span> }();</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span> </div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"> 441</span> <span class="comment">// Allocate enough base 58^10 coeff for encoding 38 bytes</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"> 442</span> <span class="comment">// log(2^(38*8),58^10)) ~= 5.18. So 6 coeff are enough</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint64_t, 6&gt;</a> base_58_10_coeff{};</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> B_58_10 = 430804206899405824; <span class="comment">// 58^10;</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> num_58_10_coeffs = 0;</div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"> 446</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> cur_2_64_end = base_2_64_coeff.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>();</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span> <span class="comment">// compute the base 58^10 coeffs</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span> <span class="keywordflow">while</span> (cur_2_64_end &gt; 0)</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span> {</div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"> 450</span> base_58_10_coeff[num_58_10_coeffs] =</div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span> ripple::b58_fast::detail::inplace_bigint_div_rem(</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span> base_2_64_coeff.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/subspan.html">subspan</a>(0, cur_2_64_end), B_58_10);</div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span> num_58_10_coeffs += 1;</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"> 454</span> <span class="keywordflow">if</span> (base_2_64_coeff[cur_2_64_end - 1] == 0)</div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span> {</div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span> cur_2_64_end -= 1;</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span> }</div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span> }</div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"> 459</span> </div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span> <span class="comment">// Translate the result into the alphabet</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span> <span class="comment">// Put all the zeros at the beginning, then all the values from the output</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/fill.html">std::fill</a>(</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.begin(), <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.begin() + input_zeros, <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">::ripple::alphabetForward</a>[0]);</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span> </div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span> <span class="comment">// iterate through the base 58^10 coeff</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span> <span class="comment">// convert to base 58 big endian then</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span> <span class="comment">// convert to alphabet big endian</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span> <span class="keywordtype">bool</span> skip_zeros = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span> <span class="keyword">auto</span> out_index = input_zeros;</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = num_58_10_coeffs - 1; i &gt;= 0; --i)</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span> {</div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <span class="keywordflow">if</span> (skip_zeros &amp;&amp; base_58_10_coeff[i] == 0)</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> {</div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> }</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> B_58_10 = 430804206899405824; <span class="comment">// 58^10;</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span> <span class="keywordflow">if</span> (base_58_10_coeff[i] &gt;= B_58_10)</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> {</div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::inputTooLarge);</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span> }</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint8_t, 10&gt;</a> <span class="keyword">const</span> b58_be =</div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span> ripple::b58_fast::detail::b58_10_to_b58_be(base_58_10_coeff[i]);</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> to_skip = 0;</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> b58_be_s{b58_be.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), b58_be.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>()};</div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span> <span class="keywordflow">if</span> (skip_zeros)</div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> {</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span> to_skip = count_leading_zeros(b58_be_s);</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span> skip_zeros = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span> <span class="keywordflow">if</span> (<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.size() &lt; (i + 1) * 10 - to_skip)</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> {</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::outputTooSmall);</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span> }</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span> }</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> b58_coeff : b58_be_s.subspan(to_skip))</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span> {</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>[out_index] = <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">::ripple::alphabetForward</a>[b58_coeff];</div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span> out_index += 1;</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span> }</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span> }</div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span> </div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span> <span class="keywordflow">return</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.subspan(0, out_index);</div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span>}</div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span> </div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span><span class="comment">// Note the input is BIG ENDIAN (some fn in this module use little endian)</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span>B58Result&lt;std::span&lt;std::uint8_t&gt;&gt;</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span>b58_to_b256_be(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string_view.html">std::string_view</a> input, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> out)</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span>{</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span> <span class="comment">// Convert from b58 to b 58^10</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span> </div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span> <span class="comment">// Max encoded value is 38 bytes</span></div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span> <span class="comment">// log(2^(38*8),58) ~= 51.9</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span> <span class="keywordflow">if</span> (input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string_view/size.html">size</a>() &gt; 52)</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span> {</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::inputTooLarge);</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span> };</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span> <span class="keywordflow">if</span> (<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.size() &lt; 8)</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span> {</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::outputTooSmall);</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span> }</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span> </div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span> <span class="keyword">auto</span> count_leading_zeros = [&amp;](<span class="keyword">auto</span> <span class="keyword">const</span>&amp; col) -&gt; <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> {</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a> = 0;</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> <span class="keyword">const</span>&amp; c : col)</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span> {</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span> <span class="keywordflow">if</span> (c != <a class="code hl_variable" href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">::ripple::alphabetForward</a>[0])</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span> {</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span> <span class="keywordflow">return</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a>;</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno"> 528</span> }</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"> 529</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a> += 1;</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno"> 530</span> }</div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"> 531</span> <span class="keywordflow">return</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/count.html">count</a>;</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno"> 532</span> };</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span> </div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span> <span class="keyword">auto</span> <span class="keyword">const</span> input_zeros = count_leading_zeros(input);</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"> 535</span> </div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno"> 536</span> <span class="comment">// Allocate enough base 58^10 coeff for encoding 38 bytes</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"> 537</span> <span class="comment">// (33 bytes for nodepublic + 1 byte token + 4 bytes checksum)</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span> <span class="comment">// log(2^(38*8),58^10)) ~= 5.18. So 6 coeff are enough</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint64_t, 6&gt;</a> b_58_10_coeff{};</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span> <span class="keyword">auto</span> [num_full_coeffs, partial_coeff_len] =</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span> ripple::b58_fast::detail::div_rem(input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string_view/size.html">size</a>(), 10);</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span> <span class="keyword">auto</span> <span class="keyword">const</span> num_partial_coeffs = partial_coeff_len ? 1 : 0;</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span> <span class="keyword">auto</span> <span class="keyword">const</span> num_b_58_10_coeffs = num_full_coeffs + num_partial_coeffs;</div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno"> 544</span> XRPL_ASSERT(</div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span> num_b_58_10_coeffs &lt;= b_58_10_coeff.size(),</div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"> 546</span> <span class="stringliteral">&quot;ripple::b58_fast::detail::b58_to_b256_be : maximum coeff&quot;</span>);</div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> c : input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string_view/substr.html">substr</a>(0, partial_coeff_len))</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span> {</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span> <span class="keyword">auto</span> cur_val = <a class="code hl_variable" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">::ripple::alphabetReverse</a>[c];</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span> <span class="keywordflow">if</span> (cur_val &lt; 0)</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno"> 551</span> {</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno"> 552</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::invalidEncodingChar);</div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span> }</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span> b_58_10_coeff[0] *= 58;</div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"> 555</span> b_58_10_coeff[0] += cur_val;</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span> }</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; 10; ++i)</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span> {</div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno"> 559</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; num_full_coeffs; ++j)</div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span> {</div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"> 561</span> <span class="keyword">auto</span> c = input[partial_coeff_len + j * 10 + i];</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span> <span class="keyword">auto</span> cur_val = <a class="code hl_variable" href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">::ripple::alphabetReverse</a>[c];</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno"> 563</span> <span class="keywordflow">if</span> (cur_val &lt; 0)</div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno"> 564</span> {</div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"> 565</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::invalidEncodingChar);</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span> }</div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno"> 567</span> b_58_10_coeff[num_partial_coeffs + j] *= 58;</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"> 568</span> b_58_10_coeff[num_partial_coeffs + j] += cur_val;</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno"> 569</span> }</div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno"> 570</span> }</div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno"> 571</span> </div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno"> 572</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> B_58_10 = 430804206899405824; <span class="comment">// 58^10;</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno"> 573</span> </div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno"> 574</span> <span class="comment">// log(2^(38*8),2^64) ~= 4.75)</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno"> 575</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint64_t, 5&gt;</a> result{};</div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno"> 576</span> result[0] = b_58_10_coeff[0];</div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno"> 577</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> cur_result_size = 1;</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno"> 578</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i &lt; num_b_58_10_coeffs; ++i)</div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno"> 579</span> {</div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"> 580</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> <span class="keyword">const</span> c = b_58_10_coeff[i];</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span> </div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"> 582</span> {</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span> <span class="keyword">auto</span> code = ripple::b58_fast::detail::inplace_bigint_mul(</div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span</a>(&amp;result[0], cur_result_size + 1), B_58_10);</div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span> <span class="keywordflow">if</span> (code != TokenCodecErrc::success)</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno"> 586</span> {</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno"> 587</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(code);</div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span> }</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span> }</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span> {</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span> <span class="keyword">auto</span> code = ripple::b58_fast::detail::inplace_bigint_add(</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno"> 592</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span</a>(&amp;result[0], cur_result_size + 1), c);</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno"> 593</span> <span class="keywordflow">if</span> (code != TokenCodecErrc::success)</div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span> {</div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(code);</div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span> }</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno"> 597</span> }</div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno"> 598</span> <span class="keywordflow">if</span> (result[cur_result_size] != 0)</div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno"> 599</span> {</div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno"> 600</span> cur_result_size += 1;</div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno"> 601</span> }</div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno"> 602</span> }</div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno"> 603</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/fill.html">std::fill</a>(<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.begin(), <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.begin() + input_zeros, 0);</div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno"> 604</span> <span class="keyword">auto</span> cur_out_i = input_zeros;</div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno"> 605</span> <span class="comment">// Don&#39;t write leading zeros to the output for the most significant</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno"> 606</span> <span class="comment">// coeff</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno"> 607</span> {</div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno"> 608</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> <span class="keyword">const</span> c = result[cur_result_size - 1];</div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno"> 609</span> <span class="keyword">auto</span> skip_zero = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno"> 610</span> <span class="comment">// start and end of output range</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno"> 611</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; 8; ++i)</div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno"> 612</span> {</div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno"> 613</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a> <span class="keyword">const</span> b = (c &gt;&gt; (8 * (7 - i))) &amp; 0xff;</div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno"> 614</span> <span class="keywordflow">if</span> (skip_zero)</div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno"> 615</span> {</div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno"> 616</span> <span class="keywordflow">if</span> (b == 0)</div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno"> 617</span> {</div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno"> 618</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno"> 619</span> }</div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno"> 620</span> skip_zero = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno"> 621</span> }</div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno"> 622</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>[cur_out_i] = b;</div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno"> 623</span> cur_out_i += 1;</div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno"> 624</span> }</div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno"> 625</span> }</div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno"> 626</span> <span class="keywordflow">if</span> ((cur_out_i + 8 * (cur_result_size - 1)) &gt; <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.size())</div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno"> 627</span> {</div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno"> 628</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::outputTooSmall);</div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno"> 629</span> }</div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"> 630</span> </div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno"> 631</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = cur_result_size - 2; i &gt;= 0; --i)</div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno"> 632</span> {</div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno"> 633</span> <span class="keyword">auto</span> c = result[i];</div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno"> 634</span> boost::endian::native_to_big_inplace(c);</div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno"> 635</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">memcpy</a>(&amp;out[cur_out_i], &amp;c, 8);</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno"> 636</span> cur_out_i += 8;</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno"> 637</span> }</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"> 638</span> </div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno"> 639</span> <span class="keywordflow">return</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>.subspan(0, cur_out_i);</div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno"> 640</span>}</div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno"> 641</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno"> 642</span> </div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno"> 643</span>B58Result&lt;std::span&lt;std::uint8_t&gt;&gt;</div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno"> 644</span><a class="code hl_function" href="namespaceripple.html#a6034aeaa84f60243a837b0ee043e4114">encodeBase58Token</a>(</div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno"> 645</span> TokenType token_type,</div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno"> 646</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> input,</div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno"> 647</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> out)</div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno"> 648</span>{</div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno"> 649</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> tmpBufSize = 128;</div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno"> 650</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint8_t, tmpBufSize&gt;</a> buf;</div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno"> 651</span> <span class="keywordflow">if</span> (input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() &gt; tmpBufSize - 5)</div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno"> 652</span> {</div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno"> 653</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::inputTooLarge);</div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno"> 654</span> }</div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno"> 655</span> <span class="keywordflow">if</span> (input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() == 0)</div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno"> 656</span> {</div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno"> 657</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::inputTooSmall);</div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno"> 658</span> }</div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno"> 659</span> <span class="comment">// &lt;type (1 byte)&gt;&lt;token (input len)&gt;&lt;checksum (4 bytes)&gt;</span></div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno"> 660</span> buf[0] = <span class="keyword">static_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a><span class="keyword">&gt;</span>(token_type);</div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno"> 661</span> <span class="comment">// buf[1..=input.len()] = input;</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno"> 662</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">memcpy</a>(&amp;buf[1], input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/data.html">data</a>(), input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>());</div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno"> 663</span> <span class="keywordtype">size_t</span> <span class="keyword">const</span> checksum_i = input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() + 1;</div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno"> 664</span> <span class="comment">// buf[checksum_i..checksum_i + 4] = checksum</span></div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno"> 665</span> <a class="code hl_function" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">checksum</a>(buf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>() + checksum_i, buf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), checksum_i);</div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno"> 666</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> b58Span(buf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), input.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() + 5);</div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno"> 667</span> <span class="keywordflow">return</span> detail::b256_to_b58_be(b58Span, out);</div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno"> 668</span>}</div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno"> 669</span><span class="comment">// Convert from base 58 to base 256, largest coefficients first</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno"> 670</span><span class="comment">// The input is encoded in XPRL format, with the token in the first</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno"> 671</span><span class="comment">// byte and the checksum in the last four bytes.</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno"> 672</span><span class="comment">// The decoded base 256 value does not include the token type or checksum.</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno"> 673</span><span class="comment">// It is an error if the token type or checksum does not match.</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno"> 674</span>B58Result&lt;std::span&lt;std::uint8_t&gt;&gt;</div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno"> 675</span><a class="code hl_function" href="namespaceripple.html#a791e5b51e5921b1070bc195ba2959f3e">decodeBase58Token</a>(</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno"> 676</span> TokenType type,</div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno"> 677</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string_view.html">std::string_view</a> s,</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno"> 678</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> outBuf)</div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno"> 679</span>{</div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno"> 680</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint8_t, 64&gt;</a> tmpBuf;</div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno"> 681</span> <span class="keyword">auto</span> <span class="keyword">const</span> decodeResult =</div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno"> 682</span> detail::b58_to_b256_be(s, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span</a>(tmpBuf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), tmpBuf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>()));</div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno"> 683</span> </div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno"> 684</span> <span class="keywordflow">if</span> (!decodeResult)</div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno"> 685</span> <span class="keywordflow">return</span> decodeResult;</div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno"> 686</span> </div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno"> 687</span> <span class="keyword">auto</span> <span class="keyword">const</span> ret = decodeResult.value();</div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno"> 688</span> </div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno"> 689</span> <span class="comment">// Reject zero length tokens</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno"> 690</span> <span class="keywordflow">if</span> (ret.size() &lt; 6)</div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno"> 691</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::inputTooSmall);</div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno"> 692</span> </div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno"> 693</span> <span class="comment">// The type must match.</span></div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno"> 694</span> <span class="keywordflow">if</span> (type != <span class="keyword">static_cast&lt;</span><a class="code hl_enumeration" href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">TokenType</a><span class="keyword">&gt;</span>(<span class="keyword">static_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a><span class="keyword">&gt;</span>(ret[0])))</div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno"> 695</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::mismatchedTokenType);</div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno"> 696</span> </div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno"> 697</span> <span class="comment">// And the checksum must as well.</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno"> 698</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::uint8_t, 4&gt;</a> guard;</div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno"> 699</span> <a class="code hl_function" href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">checksum</a>(guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(), ret.data(), ret.size() - guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>());</div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno"> 700</span> <span class="keywordflow">if</span> (!<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/equal.html">std::equal</a>(guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/rbegin.html">rbegin</a>(), guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/rend.html">rend</a>(), ret.rbegin()))</div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno"> 701</span> {</div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno"> 702</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::mismatchedChecksum);</div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno"> 703</span> }</div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno"> 704</span> </div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno"> 705</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> <span class="keyword">const</span> outSize = ret.size() - 1 - guard.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>();</div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno"> 706</span> <span class="keywordflow">if</span> (outBuf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/size.html">size</a>() &lt; outSize)</div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno"> 707</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">Unexpected</a>(TokenCodecErrc::outputTooSmall);</div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno"> 708</span> <span class="comment">// Skip the leading type byte and the trailing checksum.</span></div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno"> 709</span> <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/copy.html">std::copy</a>(ret.begin() + 1, ret.begin() + outSize + 1, outBuf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/begin.html">begin</a>());</div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno"> 710</span> <span class="keywordflow">return</span> outBuf.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/span/subspan.html">subspan</a>(0, outSize);</div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno"> 711</span>}</div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno"> 712</span> </div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno"> 713</span>[[nodiscard]] <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno"> 714</span><a class="code hl_function" href="namespaceripple.html#a6034aeaa84f60243a837b0ee043e4114">encodeBase58Token</a>(TokenType type, <span class="keywordtype">void</span> <span class="keyword">const</span>* token, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> size)</div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno"> 715</span>{</div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno"> 716</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> sr;</div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno"> 717</span> <span class="comment">// The largest object encoded as base58 is 33 bytes; This will be encoded in</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno"> 718</span> <span class="comment">// at most ceil(log(2^256,58)) bytes, or 46 bytes. 128 is plenty (and</span></div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno"> 719</span> <span class="comment">// there&#39;s not real benefit making it smaller). Note that 46 bytes may be</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno"> 720</span> <span class="comment">// encoded in more than 46 base58 chars. Since decode uses 64 as the</span></div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno"> 721</span> <span class="comment">// over-allocation, this function uses 128 (again, over-allocation assuming</span></div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno"> 722</span> <span class="comment">// 2 base 58 char per byte)</span></div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno"> 723</span> sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/resize.html">resize</a>(128);</div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno"> 724</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> outSp(</div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno"> 725</span> <span class="keyword">reinterpret_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a>*<span class="keyword">&gt;</span>(sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/data.html">data</a>()), sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>());</div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno"> 726</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t const&gt;</a> inSp(</div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno"> 727</span> <span class="keyword">reinterpret_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a> const*<span class="keyword">&gt;</span>(token), size);</div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno"> 728</span> <span class="keyword">auto</span> r = b58_fast::encodeBase58Token(type, inSp, outSp);</div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno"> 729</span> <span class="keywordflow">if</span> (!r)</div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno"> 730</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno"> 731</span> sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/resize.html">resize</a>(r.value().size());</div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno"> 732</span> <span class="keywordflow">return</span> sr;</div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno"> 733</span>}</div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno"> 734</span> </div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno"> 735</span>[[nodiscard]] <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno"> 736</span><a class="code hl_function" href="namespaceripple.html#a791e5b51e5921b1070bc195ba2959f3e">decodeBase58Token</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> <span class="keyword">const</span>&amp; s, TokenType type)</div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno"> 737</span>{</div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno"> 738</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> sr;</div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno"> 739</span> <span class="comment">// The largest object encoded as base58 is 33 bytes; 64 is plenty (and</span></div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno"> 740</span> <span class="comment">// there&#39;s no benefit making it smaller)</span></div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno"> 741</span> sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/resize.html">resize</a>(64);</div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno"> 742</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/span.html">std::span&lt;std::uint8_t&gt;</a> outSp(</div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno"> 743</span> <span class="keyword">reinterpret_cast&lt;</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a>*<span class="keyword">&gt;</span>(sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/data.html">data</a>()), sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>());</div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno"> 744</span> <span class="keyword">auto</span> r = b58_fast::decodeBase58Token(type, s, outSp);</div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno"> 745</span> <span class="keywordflow">if</span> (!r)</div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno"> 746</span> <span class="keywordflow">return</span> {};</div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno"> 747</span> sr.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/string/basic_string/resize.html">resize</a>(r.value().size());</div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno"> 748</span> <span class="keywordflow">return</span> sr;</div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno"> 749</span>}</div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno"> 750</span> </div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno"> 751</span>} <span class="comment">// namespace b58_fast</span></div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno"> 752</span><span class="preprocessor">#endif </span><span class="comment">// _MSC_VER</span></div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno"> 753</span>} <span class="comment">// namespace ripple</span></div>
<div class="ttc" id="aalgorithm_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/algorithm.html">algorithm</a></div></div>
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<div class="ttc" id="aassign_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/assign.html">std::string::assign</a></div><div class="ttdeci">T assign(T... args)</div></div>
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<div class="ttc" id="acount_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/count.html">std::count</a></div><div class="ttdeci">T count(T... args)</div></div>
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<div class="ttc" id="aend_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/end.html">std::vector::end</a></div><div class="ttdeci">T end(T... args)</div></div>
<div class="ttc" id="aequal_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/equal.html">std::equal</a></div><div class="ttdeci">T equal(T... args)</div></div>
<div class="ttc" id="afill_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/fill.html">std::fill</a></div><div class="ttdeci">T fill(T... args)</div></div>
<div class="ttc" id="afind_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/find.html">std::find_if</a></div><div class="ttdeci">T find_if(T... args)</div></div>
<div class="ttc" id="ainteger_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint8_t</a></div></div>
<div class="ttc" id="amemcpy_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/byte/memcpy.html">std::memcpy</a></div><div class="ttdeci">T memcpy(T... args)</div></div>
<div class="ttc" id="anamespaceripple_1_1b58__ref_1_1detail_html_a7228a56fbbce041214ae00bd5d761107"><div class="ttname"><a href="namespaceripple_1_1b58__ref_1_1detail.html#a7228a56fbbce041214ae00bd5d761107">ripple::b58_ref::detail::decodeBase58</a></div><div class="ttdeci">std::string decodeBase58(std::string const &amp;s)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00275">tokens.cpp:275</a></div></div>
<div class="ttc" id="anamespaceripple_1_1b58__ref_1_1detail_html_ab0b27e0b4489431b8cb8f5ff8276a6ac"><div class="ttname"><a href="namespaceripple_1_1b58__ref_1_1detail.html#ab0b27e0b4489431b8cb8f5ff8276a6ac">ripple::b58_ref::detail::encodeBase58</a></div><div class="ttdeci">std::string encodeBase58(void const *message, std::size_t size, void *temp, std::size_t temp_size)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00223">tokens.cpp:223</a></div></div>
<div class="ttc" id="anamespaceripple_1_1b58__ref_html_aa0fa3cba7987f0ba4579070b2d4bba8d"><div class="ttname"><a href="namespaceripple_1_1b58__ref.html#aa0fa3cba7987f0ba4579070b2d4bba8d">ripple::b58_ref::encodeBase58Token</a></div><div class="ttdeci">std::string encodeBase58Token(TokenType type, void const *token, std::size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00325">tokens.cpp:325</a></div></div>
<div class="ttc" id="anamespaceripple_1_1b58__ref_html_ac05a3902d978e135ba7ad0bef1e4b89e"><div class="ttname"><a href="namespaceripple_1_1b58__ref.html#ac05a3902d978e135ba7ad0bef1e4b89e">ripple::b58_ref::decodeBase58Token</a></div><div class="ttdeci">std::string decodeBase58Token(std::string const &amp;s, TokenType type)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00349">tokens.cpp:349</a></div></div>
<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="algorithm_8h_source.html#l00025">algorithm.h:25</a></div></div>
<div class="ttc" id="anamespaceripple_html_a1bf8df553d36589191c8057c136cce03"><div class="ttname"><a href="namespaceripple.html#a1bf8df553d36589191c8057c136cce03">ripple::TokenType</a></div><div class="ttdeci">TokenType</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8h_source.html#l00038">tokens.h:38</a></div></div>
<div class="ttc" id="anamespaceripple_html_a2ecf9aa7e6b7bbae47280534acefe9ea"><div class="ttname"><a href="namespaceripple.html#a2ecf9aa7e6b7bbae47280534acefe9ea">ripple::alphabetReverse</a></div><div class="ttdeci">static constexpr std::array&lt; int, 256 &gt; const alphabetReverse</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00145">tokens.cpp:145</a></div></div>
<div class="ttc" id="anamespaceripple_html_a6034aeaa84f60243a837b0ee043e4114"><div class="ttname"><a href="namespaceripple.html#a6034aeaa84f60243a837b0ee043e4114">ripple::encodeBase58Token</a></div><div class="ttdeci">std::string encodeBase58Token(TokenType type, void const *token, std::size_t size)</div><div class="ttdoc">Encode data in Base58Check format using XRPL alphabet.</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00199">tokens.cpp:199</a></div></div>
<div class="ttc" id="anamespaceripple_html_a791e5b51e5921b1070bc195ba2959f3e"><div class="ttname"><a href="namespaceripple.html#a791e5b51e5921b1070bc195ba2959f3e">ripple::decodeBase58Token</a></div><div class="ttdeci">std::string decodeBase58Token(std::string const &amp;s, TokenType type)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00209">tokens.cpp:209</a></div></div>
<div class="ttc" id="anamespaceripple_html_a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275"><div class="ttname"><a href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">ripple::QualityDirection::out</a></div><div class="ttdeci">@ out</div></div>
<div class="ttc" id="anamespaceripple_html_a91e9fe7a4e92dba79c3812fd3edcaacc"><div class="ttname"><a href="namespaceripple.html#a91e9fe7a4e92dba79c3812fd3edcaacc">ripple::digest</a></div><div class="ttdeci">static Hasher::result_type digest(void const *data, std::size_t size) noexcept</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00156">tokens.cpp:156</a></div></div>
<div class="ttc" id="anamespaceripple_html_acd04261400a2d3beb5986da2e26ed0b4"><div class="ttname"><a href="namespaceripple.html#acd04261400a2d3beb5986da2e26ed0b4">ripple::digest2</a></div><div class="ttdeci">static Hasher::result_type digest2(Args const &amp;... args)</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00177">tokens.cpp:177</a></div></div>
<div class="ttc" id="anamespaceripple_html_ad6887fe0534dd3b0df2da54ff8994e2f"><div class="ttname"><a href="namespaceripple.html#ad6887fe0534dd3b0df2da54ff8994e2f">ripple::Unexpected</a></div><div class="ttdeci">Unexpected(E(&amp;)[N]) -&gt; Unexpected&lt; E const * &gt;</div></div>
<div class="ttc" id="anamespaceripple_html_addf2e966df148c6d810b003f9f3dc9fd"><div class="ttname"><a href="namespaceripple.html#addf2e966df148c6d810b003f9f3dc9fd">ripple::checksum</a></div><div class="ttdeci">static void checksum(void *out, void const *message, std::size_t size)</div><div class="ttdoc">Calculate a 4-byte checksum of the data.</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00192">tokens.cpp:192</a></div></div>
<div class="ttc" id="anamespaceripple_html_ae9be4ba34aa8246260964cc25538caee"><div class="ttname"><a href="namespaceripple.html#ae9be4ba34aa8246260964cc25538caee">ripple::alphabetForward</a></div><div class="ttdeci">static constexpr char const * alphabetForward</div><div class="ttdef"><b>Definition:</b> <a href="tokens_8cpp_source.html#l00142">tokens.cpp:142</a></div></div>
<div class="ttc" id="apush_back_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/push_back.html">std::string::push_back</a></div><div class="ttdeci">T push_back(T... args)</div></div>
<div class="ttc" id="arbegin_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/rbegin.html">std::vector::rbegin</a></div><div class="ttdeci">T rbegin(T... args)</div></div>
<div class="ttc" id="arend_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/rend.html">std::vector::rend</a></div><div class="ttdeci">T rend(T... args)</div></div>
<div class="ttc" id="areserve_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/reserve.html">std::string::reserve</a></div><div class="ttdeci">T reserve(T... args)</div></div>
<div class="ttc" id="aresize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/resize.html">std::string::resize</a></div><div class="ttdeci">T resize(T... args)</div></div>
<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/array/size.html">std::array::size</a></div><div class="ttdeci">T size(T... args)</div></div>
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