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1 /* Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- This project is MIT/X11 licensed. Please see the |
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6 -- COPYING file in the source package for more information. |
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7 -- |
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8 */ |
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9 |
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10 /* |
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11 * encodings.c |
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12 * Lua library for base64, stringprep and idna encodings |
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13 */ |
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14 |
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15 // Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way |
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16 #define _CRT_SECURE_NO_DEPRECATE |
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17 |
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18 extern "C" { |
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19 #include <string.h> |
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20 #include <stdlib.h> |
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21 #include "lua.h" |
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22 #include "lauxlib.h" |
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23 } |
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24 /***************** BASE64 *****************/ |
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25 |
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26 #define LUALIB_API extern "C" |
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27 |
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28 static const char code[]= |
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29 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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30 |
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31 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n) |
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32 { |
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33 unsigned long tuple=c3+256UL*(c2+256UL*c1); |
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34 int i; |
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35 char s[4]; |
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36 for (i=0; i<4; i++) { |
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37 s[3-i] = code[tuple % 64]; |
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38 tuple /= 64; |
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39 } |
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40 for (i=n+1; i<4; i++) s[i]='='; |
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41 luaL_addlstring(b,s,4); |
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42 } |
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43 |
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44 static int Lbase64_encode(lua_State *L) /** encode(s) */ |
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45 { |
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46 size_t l; |
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47 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l); |
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48 luaL_Buffer b; |
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49 int n; |
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50 luaL_buffinit(L,&b); |
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51 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3); |
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52 switch (l%3) |
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53 { |
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54 case 1: base64_encode(&b,s[0],0,0,1); break; |
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55 case 2: base64_encode(&b,s[0],s[1],0,2); break; |
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56 } |
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57 luaL_pushresult(&b); |
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58 return 1; |
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59 } |
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60 |
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61 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n) |
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62 { |
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63 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1)); |
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64 char s[3]; |
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65 switch (--n) |
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66 { |
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67 case 3: s[2]=(char) tuple; |
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68 case 2: s[1]=(char) (tuple >> 8); |
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69 case 1: s[0]=(char) (tuple >> 16); |
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70 } |
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71 luaL_addlstring(b,s,n); |
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72 } |
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73 |
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74 static int Lbase64_decode(lua_State *L) /** decode(s) */ |
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75 { |
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76 size_t l; |
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77 const char *s=luaL_checklstring(L,1,&l); |
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78 luaL_Buffer b; |
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79 int n=0; |
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80 char t[4]; |
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81 luaL_buffinit(L,&b); |
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82 for (;;) |
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83 { |
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84 int c=*s++; |
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85 switch (c) |
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86 { |
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87 const char *p; |
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88 default: |
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89 p=strchr(code,c); if (p==NULL) return 0; |
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90 t[n++]= (char) (p-code); |
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91 if (n==4) |
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92 { |
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93 base64_decode(&b,t[0],t[1],t[2],t[3],4); |
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94 n=0; |
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95 } |
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96 break; |
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97 case '=': |
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98 switch (n) |
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99 { |
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100 case 1: base64_decode(&b,t[0],0,0,0,1); break; |
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101 case 2: base64_decode(&b,t[0],t[1],0,0,2); break; |
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102 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break; |
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103 } |
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104 n=0; |
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105 break; |
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106 case 0: |
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107 luaL_pushresult(&b); |
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108 return 1; |
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109 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b': |
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110 break; |
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111 } |
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112 } |
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113 } |
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114 |
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115 static const luaL_Reg Reg_base64[] = |
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116 { |
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117 { "encode", Lbase64_encode }, |
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118 { "decode", Lbase64_decode }, |
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119 { NULL, NULL } |
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120 }; |
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121 |
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122 /***************** STRINGPREP *****************/ |
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123 #ifndef USE_STRINGPREP_ICU |
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124 /****************** libidn ********************/ |
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125 #include <stringprep.h> |
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126 |
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127 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile) |
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128 { |
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129 size_t len; |
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130 const char *s; |
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131 char string[1024]; |
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132 int ret; |
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133 if(!lua_isstring(L, 1)) { |
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134 lua_pushnil(L); |
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135 return 1; |
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136 } |
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137 s = lua_tolstring(L, 1, &len); |
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138 if (len >= 1024) { |
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139 lua_pushnil(L); |
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140 return 1; // TODO return error message |
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141 } |
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142 strcpy(string, s); |
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143 ret = stringprep(string, 1024, 0, profile); |
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144 if (ret == STRINGPREP_OK) { |
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145 lua_pushstring(L, string); |
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146 return 1; |
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147 } else { |
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148 lua_pushnil(L); |
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149 return 1; // TODO return error message |
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150 } |
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151 } |
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152 |
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153 #define MAKE_PREP_FUNC(myFunc, prep) \ |
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154 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); } |
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155 |
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156 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */ |
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157 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */ |
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158 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */ |
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159 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */ |
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160 |
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161 static const luaL_Reg Reg_stringprep[] = |
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162 { |
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163 { "nameprep", Lstringprep_nameprep }, |
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164 { "nodeprep", Lstringprep_nodeprep }, |
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165 { "resourceprep", Lstringprep_resourceprep }, |
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166 { "saslprep", Lstringprep_saslprep }, |
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167 { NULL, NULL } |
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168 }; |
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169 |
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170 #else |
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171 #include <unicode/usprep.h> |
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172 //#include <unicode/stringpiece.h> |
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173 #include <unicode/unistr.h> |
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174 #include <unicode/utrace.h> |
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175 |
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176 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile) |
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177 { |
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178 size_t len; |
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179 const char *s; |
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180 UnicodeString ustr; |
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181 UErrorCode err = U_ZERO_ERROR; |
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182 UChar dest[1024]; |
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183 char output[1024]; |
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184 if(!lua_isstring(L, 1)) { |
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185 lua_pushnil(L); |
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186 return 1; |
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187 } |
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188 s = lua_tolstring(L, 1, &len); |
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189 if (len >= 1024) { |
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190 lua_pushnil(L); |
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191 return 1; // TODO return error message |
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192 } |
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193 ustr = UnicodeString::fromUTF8(s); |
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194 len = usprep_prepare(profile, ustr.getBuffer(), ustr.length(), dest, 1024, 0, NULL, &err); |
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195 if (U_FAILURE(err)) { |
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196 lua_pushnil(L); |
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197 return 1; |
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198 } else { |
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199 CheckedArrayByteSink output_sink(output, 1024); |
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200 UnicodeString dest_str(TRUE, dest, len); |
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201 dest_str.toUTF8(output_sink); |
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202 lua_pushstring(L, output); |
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203 return 1; |
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204 } |
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205 } |
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206 |
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207 UStringPrepProfile *icu_nameprep; |
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208 UStringPrepProfile *icu_nodeprep; |
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209 UStringPrepProfile *icu_resourceprep; |
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210 UStringPrepProfile *icu_saslprep; |
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211 |
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212 /* initialize global ICU stringprep profiles */ |
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213 void init_icu() |
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214 { |
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215 UErrorCode err = U_ZERO_ERROR; |
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216 utrace_setLevel(UTRACE_VERBOSE); |
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217 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err); |
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218 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err); |
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219 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err); |
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220 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err); |
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221 if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err)); |
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222 } |
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223 |
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224 #define MAKE_PREP_FUNC(myFunc, prep) \ |
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225 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); } |
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226 |
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227 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */ |
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228 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */ |
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229 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */ |
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230 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */ |
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231 |
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232 static const luaL_Reg Reg_stringprep[] = |
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233 { |
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234 { "nameprep", Lstringprep_nameprep }, |
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235 { "nodeprep", Lstringprep_nodeprep }, |
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236 { "resourceprep", Lstringprep_resourceprep }, |
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237 { "saslprep", Lstringprep_saslprep }, |
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238 { NULL, NULL } |
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239 }; |
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240 #endif |
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241 |
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242 /***************** IDNA *****************/ |
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243 #ifndef USE_STRINGPREP_ICU |
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244 /****************** libidn ********************/ |
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245 #include <idna.h> |
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246 #include <idn-free.h> |
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247 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */ |
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248 { |
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249 size_t len; |
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250 const char *s = luaL_checklstring(L, 1, &len); |
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251 char* output = NULL; |
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252 int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES); |
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253 if (ret == IDNA_SUCCESS) { |
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254 lua_pushstring(L, output); |
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255 idn_free(output); |
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256 return 1; |
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257 } else { |
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258 lua_pushnil(L); |
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259 idn_free(output); |
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260 return 1; // TODO return error message |
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261 } |
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262 } |
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263 |
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264 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */ |
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265 { |
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266 size_t len; |
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267 const char *s = luaL_checklstring(L, 1, &len); |
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268 char* output = NULL; |
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269 int ret = idna_to_unicode_8z8z(s, &output, 0); |
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270 if (ret == IDNA_SUCCESS) { |
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271 lua_pushstring(L, output); |
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272 idn_free(output); |
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273 return 1; |
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274 } else { |
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275 lua_pushnil(L); |
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276 idn_free(output); |
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277 return 1; // TODO return error message |
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278 } |
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279 } |
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280 #else |
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281 #include <unicode/ustdio.h> |
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282 #include <unicode/uidna.h> |
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283 /* IDNA2003 or IDNA2008 ? ? ? */ |
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284 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */ |
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285 { |
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286 size_t len; |
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287 int32_t out_len; |
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288 const char *s = luaL_checklstring(L, 1, &len); |
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289 UnicodeString ustr; |
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290 UErrorCode err = U_ZERO_ERROR; |
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291 UChar dest[1024]; |
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292 char output[1024]; |
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293 |
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294 ustr = UnicodeString::fromUTF8(s); |
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295 out_len = uidna_IDNToASCII(ustr.getBuffer(), ustr.length(), dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err); |
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296 if (U_FAILURE(err)) { |
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297 lua_pushnil(L); |
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298 return 1; |
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299 } else { |
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300 CheckedArrayByteSink output_sink(output, 1024); |
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301 UnicodeString dest_str(TRUE, dest, out_len); |
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302 dest_str.toUTF8(output_sink); |
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303 lua_pushstring(L, output); |
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304 return 1; |
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305 } |
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306 } |
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307 |
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308 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */ |
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309 { |
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310 size_t len; |
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311 int32_t out_len; |
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312 const char *s = luaL_checklstring(L, 1, &len); |
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313 UnicodeString ustr; |
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314 UErrorCode err = U_ZERO_ERROR; |
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315 UChar dest[1024]; |
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316 char output[1024]; |
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317 |
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318 ustr = UnicodeString::fromUTF8(s); |
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319 out_len = uidna_IDNToUnicode(ustr.getBuffer(), ustr.length(), dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err); |
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320 if (U_FAILURE(err)) { |
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321 lua_pushnil(L); |
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322 return 1; |
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323 } else { |
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324 CheckedArrayByteSink output_sink(output, 1024); |
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325 UnicodeString dest_str(TRUE, dest, out_len); |
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326 dest_str.toUTF8(output_sink); |
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327 lua_pushstring(L, output); |
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328 return 1; |
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329 } |
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330 } |
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331 #endif |
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332 |
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333 static const luaL_Reg Reg_idna[] = |
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334 { |
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335 { "to_ascii", Lidna_to_ascii }, |
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336 { "to_unicode", Lidna_to_unicode }, |
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337 { NULL, NULL } |
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338 }; |
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339 |
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340 /***************** end *****************/ |
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341 |
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342 static const luaL_Reg Reg[] = |
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343 { |
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344 { NULL, NULL } |
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345 }; |
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346 |
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347 LUALIB_API int luaopen_util_encodings(lua_State *L) |
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348 { |
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349 #ifdef USE_STRINGPREP_ICU |
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350 init_icu(); |
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351 #endif |
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352 luaL_register(L, "encodings", Reg); |
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353 |
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354 lua_pushliteral(L, "base64"); |
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355 lua_newtable(L); |
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356 luaL_register(L, NULL, Reg_base64); |
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357 lua_settable(L,-3); |
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358 |
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359 lua_pushliteral(L, "stringprep"); |
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360 lua_newtable(L); |
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361 luaL_register(L, NULL, Reg_stringprep); |
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362 lua_settable(L,-3); |
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363 |
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364 lua_pushliteral(L, "idna"); |
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365 lua_newtable(L); |
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366 luaL_register(L, NULL, Reg_idna); |
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367 lua_settable(L,-3); |
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368 |
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369 lua_pushliteral(L, "version"); /** version */ |
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370 lua_pushliteral(L, "-3.14"); |
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371 lua_settable(L,-3); |
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372 return 1; |
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373 } |