prosody
0d7137fee360
util-src/encodings.cpp

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util-src/encodings.cpp @ 3766:0d7137fee360

util.stanza: Iterate on childtags instead of all childs.
author Kim Alvefur <zash@zash.se>
date Fri, 17 Dec 2010 17:28:05 +0100
parent 3764:323169f229fa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 extern "C" {
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126 #include <stringprep.h>
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127 }
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128 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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129 {
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130 size_t len;
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131 const char *s;
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132 char string[1024];
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133 int ret;
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134 if(!lua_isstring(L, 1)) {
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135 lua_pushnil(L);
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136 return 1;
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137 }
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138 s = lua_tolstring(L, 1, &len);
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139 if (len >= 1024) {
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140 lua_pushnil(L);
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141 return 1; // TODO return error message
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142 }
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143 strcpy(string, s);
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144 ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
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145 if (ret == STRINGPREP_OK) {
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146 lua_pushstring(L, string);
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147 return 1;
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148 } else {
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149 lua_pushnil(L);
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150 return 1; // TODO return error message
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151 }
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152 }
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153
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154 #define MAKE_PREP_FUNC(myFunc, prep) \
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155 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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156
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157 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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158 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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159 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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160 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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161
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162 static const luaL_Reg Reg_stringprep[] =
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163 {
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164 { "nameprep", Lstringprep_nameprep },
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165 { "nodeprep", Lstringprep_nodeprep },
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166 { "resourceprep", Lstringprep_resourceprep },
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167 { "saslprep", Lstringprep_saslprep },
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168 { NULL, NULL }
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169 };
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170
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171 #else
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172 #include <unicode/usprep.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 }