prosody
317ad7f1c2ba
util-src/encodings.c

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util-src/encodings.c @ 6586:317ad7f1c2ba

prosodyctl: Use util.mercurial to identify hg repository and revision
author Kim Alvefur <zash@zash.se>
date Wed, 21 Jan 2015 02:55:23 +0100
parent 6413:a552f4170aed
child 6602:61b6a4fc65f1
child 6604:478308ee29dd
child 6607:64e6b88b6b21
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 #if (LUA_VERSION_NUM == 502)
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24 #define luaL_register(L, N, R) luaL_setfuncs(L, R, 0)
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25 #endif
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26
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27 /***************** BASE64 *****************/
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28
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29 static const char code[]=
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30 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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31
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32 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
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33 {
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34 unsigned long tuple=c3+256UL*(c2+256UL*c1);
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35 int i;
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36 char s[4];
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37 for (i=0; i<4; i++) {
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38 s[3-i] = code[tuple % 64];
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39 tuple /= 64;
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40 }
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41 for (i=n+1; i<4; i++) s[i]='=';
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42 luaL_addlstring(b,s,4);
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43 }
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44
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45 static int Lbase64_encode(lua_State *L) /** encode(s) */
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46 {
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47 size_t l;
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48 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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49 luaL_Buffer b;
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50 int n;
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51 luaL_buffinit(L,&b);
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52 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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53 switch (l%3)
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54 {
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55 case 1: base64_encode(&b,s[0],0,0,1); break;
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56 case 2: base64_encode(&b,s[0],s[1],0,2); break;
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57 }
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58 luaL_pushresult(&b);
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59 return 1;
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60 }
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61
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62 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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63 {
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64 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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65 char s[3];
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66 switch (--n)
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67 {
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68 case 3: s[2]=(char) tuple;
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69 case 2: s[1]=(char) (tuple >> 8);
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70 case 1: s[0]=(char) (tuple >> 16);
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71 }
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72 luaL_addlstring(b,s,n);
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73 }
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74
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75 static int Lbase64_decode(lua_State *L) /** decode(s) */
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76 {
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77 size_t l;
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78 const char *s=luaL_checklstring(L,1,&l);
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79 luaL_Buffer b;
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80 int n=0;
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81 char t[4];
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82 luaL_buffinit(L,&b);
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83 for (;;)
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84 {
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85 int c=*s++;
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86 switch (c)
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87 {
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88 const char *p;
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89 default:
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90 p=strchr(code,c); if (p==NULL) return 0;
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91 t[n++]= (char) (p-code);
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92 if (n==4)
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93 {
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94 base64_decode(&b,t[0],t[1],t[2],t[3],4);
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95 n=0;
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96 }
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97 break;
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98 case '=':
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99 switch (n)
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100 {
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101 case 1: base64_decode(&b,t[0],0,0,0,1); break;
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102 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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103 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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104 }
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105 n=0;
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106 break;
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107 case 0:
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108 luaL_pushresult(&b);
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109 return 1;
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110 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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111 break;
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112 }
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113 }
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114 }
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115
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116 static const luaL_Reg Reg_base64[] =
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117 {
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118 { "encode", Lbase64_encode },
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119 { "decode", Lbase64_decode },
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120 { NULL, NULL }
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121 };
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122
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123 /***************** STRINGPREP *****************/
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124 #ifdef USE_STRINGPREP_ICU
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125
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126 #include <unicode/usprep.h>
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127 #include <unicode/ustring.h>
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128 #include <unicode/utrace.h>
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129
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130 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
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131 {
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132 size_t input_len;
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133 int32_t unprepped_len, prepped_len, output_len;
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134 const char *input;
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135 char output[1024];
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136
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137 UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */
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138 UChar prepped[1024];
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139
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140 UErrorCode err = U_ZERO_ERROR;
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141
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142 if(!lua_isstring(L, 1)) {
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143 lua_pushnil(L);
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144 return 1;
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145 }
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146 input = lua_tolstring(L, 1, &input_len);
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147 if (input_len >= 1024) {
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148 lua_pushnil(L);
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149 return 1;
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150 }
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151 u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);
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152 if (U_FAILURE(err)) {
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153 lua_pushnil(L);
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154 return 1;
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155 }
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156 prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);
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157 if (U_FAILURE(err)) {
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158 lua_pushnil(L);
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159 return 1;
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160 } else {
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161 u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);
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162 if (U_SUCCESS(err) && output_len < 1024)
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163 lua_pushlstring(L, output, output_len);
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164 else
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165 lua_pushnil(L);
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166 return 1;
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167 }
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168 }
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169
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170 UStringPrepProfile *icu_nameprep;
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171 UStringPrepProfile *icu_nodeprep;
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172 UStringPrepProfile *icu_resourceprep;
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173 UStringPrepProfile *icu_saslprep;
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174
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175 /* initialize global ICU stringprep profiles */
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176 void init_icu()
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177 {
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178 UErrorCode err = U_ZERO_ERROR;
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179 utrace_setLevel(UTRACE_VERBOSE);
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180 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
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181 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
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182 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
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183 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
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184 if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
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185 }
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186
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187 #define MAKE_PREP_FUNC(myFunc, prep) \
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188 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
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189
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190 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */
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191 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */
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192 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */
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193 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */
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194
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195 static const luaL_Reg Reg_stringprep[] =
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196 {
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197 { "nameprep", Lstringprep_nameprep },
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198 { "nodeprep", Lstringprep_nodeprep },
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199 { "resourceprep", Lstringprep_resourceprep },
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200 { "saslprep", Lstringprep_saslprep },
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201 { NULL, NULL }
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202 };
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203 #else /* USE_STRINGPREP_ICU */
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204
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205 /****************** libidn ********************/
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206
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207 #include <stringprep.h>
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208
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209 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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210 {
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211 size_t len;
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212 const char *s;
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213 char string[1024];
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214 int ret;
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215 if(!lua_isstring(L, 1)) {
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216 lua_pushnil(L);
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217 return 1;
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218 }
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219 s = lua_tolstring(L, 1, &len);
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220 if (len >= 1024) {
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221 lua_pushnil(L);
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222 return 1; /* TODO return error message */
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223 }
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224 strcpy(string, s);
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225 ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
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226 if (ret == STRINGPREP_OK) {
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227 lua_pushstring(L, string);
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228 return 1;
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229 } else {
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230 lua_pushnil(L);
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231 return 1; /* TODO return error message */
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232 }
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233 }
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234
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235 #define MAKE_PREP_FUNC(myFunc, prep) \
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236 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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237
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238 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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239 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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240 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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241 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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242
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243 static const luaL_Reg Reg_stringprep[] =
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244 {
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245 { "nameprep", Lstringprep_nameprep },
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246 { "nodeprep", Lstringprep_nodeprep },
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247 { "resourceprep", Lstringprep_resourceprep },
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248 { "saslprep", Lstringprep_saslprep },
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249 { NULL, NULL }
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250 };
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251 #endif
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252
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253 /***************** IDNA *****************/
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254 #ifdef USE_STRINGPREP_ICU
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255 #include <unicode/ustdio.h>
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256 #include <unicode/uidna.h>
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257 /* IDNA2003 or IDNA2008 ? ? ? */
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258 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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259 {
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260 size_t len;
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261 int32_t ulen, dest_len, output_len;
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262 const char *s = luaL_checklstring(L, 1, &len);
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263 UChar ustr[1024];
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264 UErrorCode err = U_ZERO_ERROR;
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265 UChar dest[1024];
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266 char output[1024];
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267
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268 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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269 if (U_FAILURE(err)) {
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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 dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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275 if (U_FAILURE(err)) {
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276 lua_pushnil(L);
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277 return 1;
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278 } else {
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279 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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280 if (U_SUCCESS(err) && output_len < 1024)
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281 lua_pushlstring(L, output, output_len);
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282 else
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283 lua_pushnil(L);
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284 return 1;
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285 }
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286 }
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287
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288 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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289 {
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290 size_t len;
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291 int32_t ulen, dest_len, output_len;
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292 const char *s = luaL_checklstring(L, 1, &len);
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293 UChar ustr[1024];
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294 UErrorCode err = U_ZERO_ERROR;
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295 UChar dest[1024];
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296 char output[1024];
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297
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298 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
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299 if (U_FAILURE(err)) {
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300 lua_pushnil(L);
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301 return 1;
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302 }
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303
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304 dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
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305 if (U_FAILURE(err)) {
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306 lua_pushnil(L);
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307 return 1;
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308 } else {
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309 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
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310 if (U_SUCCESS(err) && output_len < 1024)
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311 lua_pushlstring(L, output, output_len);
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312 else
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313 lua_pushnil(L);
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314 return 1;
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315 }
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316 }
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317
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318 #else /* USE_STRINGPREP_ICU */
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319 /****************** libidn ********************/
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320
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321 #include <idna.h>
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322 #include <idn-free.h>
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323
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324 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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325 {
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326 size_t len;
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327 const char *s = luaL_checklstring(L, 1, &len);
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328 char* output = NULL;
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329 int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
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330 if (ret == IDNA_SUCCESS) {
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331 lua_pushstring(L, output);
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332 idn_free(output);
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333 return 1;
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334 } else {
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335 lua_pushnil(L);
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336 idn_free(output);
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337 return 1; /* TODO return error message */
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338 }
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339 }
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340
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341 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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342 {
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343 size_t len;
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344 const char *s = luaL_checklstring(L, 1, &len);
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345 char* output = NULL;
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346 int ret = idna_to_unicode_8z8z(s, &output, 0);
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347 if (ret == IDNA_SUCCESS) {
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348 lua_pushstring(L, output);
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349 idn_free(output);
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350 return 1;
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351 } else {
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352 lua_pushnil(L);
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353 idn_free(output);
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354 return 1; /* TODO return error message */
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355 }
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356 }
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357 #endif
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diff changeset
358
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359 static const luaL_Reg Reg_idna[] =
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diff changeset
360 {
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361 { "to_ascii", Lidna_to_ascii },
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362 { "to_unicode", Lidna_to_unicode },
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363 { NULL, NULL }
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364 };
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365
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366 /***************** end *****************/
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367
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368 LUALIB_API int luaopen_util_encodings(lua_State *L)
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diff changeset
369 {
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370 #ifdef USE_STRINGPREP_ICU
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371 init_icu();
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372 #endif
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diff changeset
373 lua_newtable(L);
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diff changeset
374
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375 lua_newtable(L);
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376 luaL_register(L, NULL, Reg_base64);
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377 lua_setfield(L, -2, "base64");
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parents: 601
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378
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parents: 601
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379 lua_newtable(L);
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parents: 601
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380 luaL_register(L, NULL, Reg_stringprep);
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parents: 6411
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381 lua_setfield(L, -2, "stringprep");
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parents: 601
diff changeset
382
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parents: 601
diff changeset
383 lua_newtable(L);
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parents: 601
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384 luaL_register(L, NULL, Reg_idna);
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parents: 6411
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385 lua_setfield(L, -2, "idna");
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parents: 601
diff changeset
386
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parents: 601
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387 lua_pushliteral(L, "-3.14");
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parents: 6411
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388 lua_setfield(L, -2, "version");
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389 return 1;
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parents: 601
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390 }