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annotate mod_s2s_v6mesh/base32.lib.lua @ 6547:cfcd2d2f7119

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mod_restrict_federation: Fix attribute check
author Matthew Wild <mwild1@gmail.com>
date Sun, 24 May 2026 18:42:43 +0100
parents 9f43226c7de1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6472
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1 --[[
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2 borrowed from basexx library for Lua, under MIT License (MIT)
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3 Copyright (c) 2013 aiq
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4 The MIT License (MIT)
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5
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6 Copyright (c) 2013 aiq
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7
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8 Permission is hereby granted, free of charge, to any person obtaining a copy of
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9 this software and associated documentation files (the "Software"), to deal in
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10 the Software without restriction, including without limitation the rights to
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11 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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12 the Software, and to permit persons to whom the Software is furnished to do so,
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13 subject to the following conditions:
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14
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15 The above copyright notice and this permission notice shall be included in all
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16 copies or substantial portions of the Software.
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17
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18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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20 FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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21 COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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22 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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23 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 ----------------------------------------------------------------------------]]
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25
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26 local function ignore_set( str, set )
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27 if set then
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28 str = str:gsub( "["..set.."]", "" )
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29 end
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30 return str
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31 end
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32
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33 local function divide_string( str, max )
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34 local result = {}
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35
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36 local start = 1
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37 for i = 1, #str do
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38 if i % max == 0 then
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39 table.insert( result, str:sub( start, i ) )
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40 start = i + 1
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41 elseif i == #str then
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42 table.insert( result, str:sub( start, i ) )
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43 end
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44 end
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45
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46 return result
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47 end
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48
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49 function to_bit( str )
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50 return ( str:gsub( '.', function ( c )
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51 local byte = string.byte( c )
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52 local bits = {}
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53 for _ = 1,8 do
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54 table.insert( bits, byte % 2 )
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55 byte = math.floor( byte / 2 )
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56 end
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57 return table.concat( bits ):reverse()
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58 end ) )
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59 end
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60
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61 local function number_to_bit( num, length )
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62 local bits = {}
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63
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64 while num > 0 do
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65 local rest = math.floor( math.fmod( num, 2 ) )
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66 table.insert( bits, rest )
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67 num = ( num - rest ) / 2
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68 end
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69
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70 while #bits < length do
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71 table.insert( bits, "0" )
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72 end
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73
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74 return string.reverse( table.concat( bits ) )
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75 end
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76
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77 local function pure_from_bit( str )
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78 return ( str:gsub( '........', function ( cc )
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79 return string.char( tonumber( cc, 2 ) )
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80 end ) )
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81 end
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82
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83 local function unexpected_char_error( str, pos )
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84 local c = string.sub( str, pos, pos )
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85 return string.format( "unexpected character at position %d: '%s'", pos, c )
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86 end
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87
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88 local function from_basexx( str, alphabet, bits )
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89 local result = {}
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90 for i = 1, #str do
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91 local c = string.sub( str, i, i )
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92 if c ~= '=' then
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93 local index = string.find( alphabet, c, 1, true )
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94 if not index then
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95 return nil, unexpected_char_error( str, i )
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96 end
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97 table.insert( result, number_to_bit( index - 1, bits ) )
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98 end
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99 end
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100
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101 local value = table.concat( result )
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102 local pad = #value % 8
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103 return pure_from_bit( string.sub( value, 1, #value - pad ) )
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104 end
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105
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106 local function to_basexx( str, alphabet, bits, pad )
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107 local bitString = to_bit( str )
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108
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109 local chunks = divide_string( bitString, bits )
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110 local result = {}
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111 for _,value in ipairs( chunks ) do
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112 if ( #value < bits ) then
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113 value = value .. string.rep( '0', bits - #value )
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114 end
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115 local pos = tonumber( value, 2 ) + 1
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116 table.insert( result, alphabet:sub( pos, pos ) )
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117 end
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118
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119 table.insert( result, pad )
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120 return table.concat( result )
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121 end
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122
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123 local base32Alphabet = "abcdefghijklmnopqrstuvwxyz234567"
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124 local base32PadMap = { "", "======", "====", "===", "=" }
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125
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126 local function from_base32( str, ignore )
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127 str = ignore_set( str, ignore )
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128 return from_basexx( string.lower( str ), base32Alphabet, 5 )
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129 end
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130
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131 function to_base32( str )
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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132 return to_basexx( str, base32Alphabet, 5, base32PadMap[ #str % 5 + 1 ] )
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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133 end
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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134
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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135 return {
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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136 decode = from_base32;
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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137 encode = to_base32;
9f43226c7de1 mod_s2s_v6mesh: DNS-less federation for IPv6 networks
Matthew Wild <mwild1@gmail.com>
parents:
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138 };