prosody
0a4ce2086a88
util-src/encodings.c

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util-src/encodings.c @ 4272:0a4ce2086a88

util.encodings: Swap code order ("ifndef" bugs me)
author Paul Aurich <paul@darkrain42.org>
date Sun, 22 May 2011 15:40:16 -0700
parent 4271:18d888c8c12d
child 4273:7f789266b741
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 #include <string.h>
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19 #include <stdlib.h>
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20 #include "lua.h"
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21 #include "lauxlib.h"
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22
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23 /***************** BASE64 *****************/
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24
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25 static const char code[]=
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26 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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27
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28 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
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29 {
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30 unsigned long tuple=c3+256UL*(c2+256UL*c1);
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31 int i;
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32 char s[4];
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33 for (i=0; i<4; i++) {
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34 s[3-i] = code[tuple % 64];
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35 tuple /= 64;
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36 }
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37 for (i=n+1; i<4; i++) s[i]='=';
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38 luaL_addlstring(b,s,4);
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39 }
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40
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41 static int Lbase64_encode(lua_State *L) /** encode(s) */
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42 {
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43 size_t l;
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44 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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45 luaL_Buffer b;
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46 int n;
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47 luaL_buffinit(L,&b);
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48 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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49 switch (l%3)
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50 {
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51 case 1: base64_encode(&b,s[0],0,0,1); break;
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52 case 2: base64_encode(&b,s[0],s[1],0,2); break;
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53 }
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54 luaL_pushresult(&b);
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55 return 1;
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56 }
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57
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58 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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59 {
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60 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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61 char s[3];
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62 switch (--n)
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63 {
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64 case 3: s[2]=(char) tuple;
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65 case 2: s[1]=(char) (tuple >> 8);
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66 case 1: s[0]=(char) (tuple >> 16);
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67 }
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68 luaL_addlstring(b,s,n);
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69 }
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70
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71 static int Lbase64_decode(lua_State *L) /** decode(s) */
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72 {
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73 size_t l;
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74 const char *s=luaL_checklstring(L,1,&l);
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75 luaL_Buffer b;
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76 int n=0;
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77 char t[4];
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78 luaL_buffinit(L,&b);
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79 for (;;)
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80 {
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81 int c=*s++;
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82 switch (c)
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83 {
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84 const char *p;
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85 default:
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86 p=strchr(code,c); if (p==NULL) return 0;
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87 t[n++]= (char) (p-code);
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88 if (n==4)
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89 {
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90 base64_decode(&b,t[0],t[1],t[2],t[3],4);
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91 n=0;
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92 }
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93 break;
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94 case '=':
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95 switch (n)
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96 {
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97 case 1: base64_decode(&b,t[0],0,0,0,1); break;
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98 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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99 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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100 }
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101 n=0;
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102 break;
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103 case 0:
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104 luaL_pushresult(&b);
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105 return 1;
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106 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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107 break;
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108 }
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109 }
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110 }
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111
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112 static const luaL_Reg Reg_base64[] =
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113 {
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114 { "encode", Lbase64_encode },
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115 { "decode", Lbase64_decode },
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116 { NULL, NULL }
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117 };
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118
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119 /***************** STRINGPREP *****************/
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120 #ifdef USE_STRINGPREP_ICU
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121
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122 #include <unicode/usprep.h>
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123 #include <unicode/ustring.h>
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124 #include <unicode/utrace.h>
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125
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126 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
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127 {
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128 size_t input_len;
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129 int32_t unprepped_len, prepped_len, output_len;
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130 const char *input;
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131 char output[1024];
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132
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133 UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */
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134 UChar prepped[1024];
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135
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136 UErrorCode err = U_ZERO_ERROR;
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137
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138 if(!lua_isstring(L, 1)) {
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139 lua_pushnil(L);
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140 return 1;
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141 }
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142 input = lua_tolstring(L, 1, &input_len);
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143 if (input_len >= 1024) {
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144 lua_pushnil(L);
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145 return 1;
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146 }
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147 u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);
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148 prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);
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149 if (U_FAILURE(err)) {
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150 lua_pushnil(L);
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151 return 1;
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152 } else {
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153 u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);
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154 if(output_len < 1024)
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155 lua_pushlstring(L, output, output_len);
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156 else
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157 lua_pushnil(L);
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158 return 1;
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159 }
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160 }
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161
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162 UStringPrepProfile *icu_nameprep;
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163 UStringPrepProfile *icu_nodeprep;
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164 UStringPrepProfile *icu_resourceprep;
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165 UStringPrepProfile *icu_saslprep;
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166
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167 /* initialize global ICU stringprep profiles */
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168 void init_icu()
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169 {
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170 UErrorCode err = U_ZERO_ERROR;
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171 utrace_setLevel(UTRACE_VERBOSE);
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172 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
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173 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
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174 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
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175 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
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176 if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
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177 }
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178
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179 #define MAKE_PREP_FUNC(myFunc, prep) \
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180 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
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181
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182 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */
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183 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */
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184 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */
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185 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */
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186
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187 static const luaL_Reg Reg_stringprep[] =
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188 {
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189 { "nameprep", Lstringprep_nameprep },
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190 { "nodeprep", Lstringprep_nodeprep },
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191 { "resourceprep", Lstringprep_resourceprep },
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192 { "saslprep", Lstringprep_saslprep },
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193 { NULL, NULL }
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194 };
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195 #else /* USE_STRINGPREP_ICU */
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196
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197 /****************** libidn ********************/
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198
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199 #include <stringprep.h>
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200
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201 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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202 {
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203 size_t len;
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204 const char *s;
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205 char string[1024];
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206 int ret;
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207 if(!lua_isstring(L, 1)) {
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208 lua_pushnil(L);
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209 return 1;
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210 }
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211 s = lua_tolstring(L, 1, &len);
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212 if (len >= 1024) {
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213 lua_pushnil(L);
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214 return 1; /* TODO return error message */
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215 }
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216 strcpy(string, s);
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217 ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
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218 if (ret == STRINGPREP_OK) {
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219 lua_pushstring(L, string);
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220 return 1;
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221 } else {
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222 lua_pushnil(L);
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223 return 1; /* TODO return error message */
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224 }
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225 }
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226
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227 #define MAKE_PREP_FUNC(myFunc, prep) \
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228 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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229
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230 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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231 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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232 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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233 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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234
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235 static const luaL_Reg Reg_stringprep[] =
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236 {
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237 { "nameprep", Lstringprep_nameprep },
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238 { "nodeprep", Lstringprep_nodeprep },
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239 { "resourceprep", Lstringprep_resourceprep },
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240 { "saslprep", Lstringprep_saslprep },
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241 { NULL, NULL }
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242 };
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243 #endif
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244
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245 /***************** IDNA *****************/
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246 #ifdef USE_STRINGPREP_ICU
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247 #include <unicode/ustdio.h>
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248 #include <unicode/uidna.h>
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249 /* IDNA2003 or IDNA2008 ? ? ? */
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250 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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251 {
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252 size_t len;
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253 int32_t ulen, dest_len, output_len;
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254 const char *s = luaL_checklstring(L, 1, &len);
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255 UChar ustr[1024];
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256 UErrorCode err = U_ZERO_ERROR;
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257 UChar dest[1024];
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258 char output[1024];
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259
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260 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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261 dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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262 if (U_FAILURE(err)) {
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263 lua_pushnil(L);
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264 return 1;
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265 } else {
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266 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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267 if(output_len < 1024)
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268 lua_pushlstring(L, output, output_len);
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269 else
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270 lua_pushnil(L);
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271 return 1;
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272 }
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273 }
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274
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275 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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276 {
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277 size_t len;
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278 int32_t ulen, dest_len, output_len;
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279 const char *s = luaL_checklstring(L, 1, &len);
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280 UChar ustr[1024];
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281 UErrorCode err = U_ZERO_ERROR;
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282 UChar dest[1024];
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283 char output[1024];
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284
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285 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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286 dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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287 if (U_FAILURE(err)) {
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288 lua_pushnil(L);
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289 return 1;
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290 } else {
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291 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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292 if(output_len < 1024)
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293 lua_pushlstring(L, output, output_len);
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294 else
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295 lua_pushnil(L);
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296 return 1;
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297 }
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298 }
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299
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300 #else /* USE_STRINGPREP_ICU */
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301 /****************** libidn ********************/
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302
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303 #include <idna.h>
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304 #include <idn-free.h>
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305
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306 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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307 {
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308 size_t len;
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309 const char *s = luaL_checklstring(L, 1, &len);
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310 char* output = NULL;
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311 int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
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312 if (ret == IDNA_SUCCESS) {
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313 lua_pushstring(L, output);
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314 idn_free(output);
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315 return 1;
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316 } else {
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317 lua_pushnil(L);
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318 idn_free(output);
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319 return 1; /* TODO return error message */
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320 }
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321 }
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322
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323 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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324 {
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325 size_t len;
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326 const char *s = luaL_checklstring(L, 1, &len);
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327 char* output = NULL;
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328 int ret = idna_to_unicode_8z8z(s, &output, 0);
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329 if (ret == IDNA_SUCCESS) {
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330 lua_pushstring(L, output);
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331 idn_free(output);
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332 return 1;
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333 } else {
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334 lua_pushnil(L);
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335 idn_free(output);
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336 return 1; /* TODO return error message */
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337 }
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338 }
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339 #endif
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340
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341 static const luaL_Reg Reg_idna[] =
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342 {
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343 { "to_ascii", Lidna_to_ascii },
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344 { "to_unicode", Lidna_to_unicode },
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345 { NULL, NULL }
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346 };
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347
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348 /***************** end *****************/
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349
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350 static const luaL_Reg Reg[] =
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351 {
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352 { NULL, NULL }
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353 };
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354
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355 LUALIB_API int luaopen_util_encodings(lua_State *L)
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356 {
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357 #ifdef USE_STRINGPREP_ICU
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358 init_icu();
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359 #endif
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360 luaL_register(L, "encodings", Reg);
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361
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362 lua_pushliteral(L, "base64");
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363 lua_newtable(L);
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364 luaL_register(L, NULL, Reg_base64);
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365 lua_settable(L,-3);
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366
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367 lua_pushliteral(L, "stringprep");
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368 lua_newtable(L);
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369 luaL_register(L, NULL, Reg_stringprep);
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370 lua_settable(L,-3);
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371
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372 lua_pushliteral(L, "idna");
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373 lua_newtable(L);
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374 luaL_register(L, NULL, Reg_idna);
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375 lua_settable(L,-3);
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376
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377 lua_pushliteral(L, "version"); /** version */
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378 lua_pushliteral(L, "-3.14");
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379 lua_settable(L,-3);
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380 return 1;
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381 }