prosody
7798735be42b
util-src/encodings.c

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util-src/encodings.c @ 1074:7798735be42b

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author Matthew Wild <mwild1@gmail.com>
date Thu, 30 Apr 2009 02:30:03 +0100
parent 896:2c0b9e3c11c3
child 1829:3d0db768be2f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
896
2c0b9e3c11c3 0.3->0.4
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1 /* Prosody IM v0.4
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 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
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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 static const char code[]=
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27 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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28
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29 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
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30 {
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31 unsigned long tuple=c3+256UL*(c2+256UL*c1);
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32 int i;
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33 char s[4];
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34 for (i=0; i<4; i++) {
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35 s[3-i] = code[tuple % 64];
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36 tuple /= 64;
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37 }
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38 for (i=n+1; i<4; i++) s[i]='=';
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39 luaL_addlstring(b,s,4);
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40 }
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41
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42 static int Lbase64_encode(lua_State *L) /** encode(s) */
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43 {
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44 size_t l;
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45 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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46 luaL_Buffer b;
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47 int n;
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48 luaL_buffinit(L,&b);
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49 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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50 switch (l%3)
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51 {
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52 case 1: base64_encode(&b,s[0],0,0,1); break;
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53 case 2: base64_encode(&b,s[0],s[1],0,2); break;
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54 }
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55 luaL_pushresult(&b);
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56 return 1;
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57 }
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58
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59 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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60 {
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61 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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62 char s[3];
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63 switch (--n)
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64 {
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65 case 3: s[2]=(char) tuple;
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66 case 2: s[1]=(char) (tuple >> 8);
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67 case 1: s[0]=(char) (tuple >> 16);
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68 }
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69 luaL_addlstring(b,s,n);
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70 }
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71
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72 static int Lbase64_decode(lua_State *L) /** decode(s) */
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73 {
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74 size_t l;
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75 const char *s=luaL_checklstring(L,1,&l);
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76 luaL_Buffer b;
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77 int n=0;
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78 char t[4];
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79 luaL_buffinit(L,&b);
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80 for (;;)
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81 {
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82 int c=*s++;
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83 switch (c)
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84 {
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85 const char *p;
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86 default:
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87 p=strchr(code,c); if (p==NULL) return 0;
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88 t[n++]= (char) (p-code);
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89 if (n==4)
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90 {
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91 base64_decode(&b,t[0],t[1],t[2],t[3],4);
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92 n=0;
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93 }
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94 break;
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95 case '=':
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96 switch (n)
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97 {
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98 case 1: base64_decode(&b,t[0],0,0,0,1); break;
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99 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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100 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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101 }
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102 n=0;
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103 break;
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104 case 0:
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105 luaL_pushresult(&b);
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106 return 1;
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107 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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108 break;
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109 }
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110 }
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111 return 0;
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112 }
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113
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114 static const luaL_Reg Reg_base64[] =
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115 {
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116 { "encode", Lbase64_encode },
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117 { "decode", Lbase64_decode },
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118 { NULL, NULL }
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119 };
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120
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121 /***************** STRINGPREP *****************/
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122
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123 #include <stringprep.h>
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124
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125 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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126 {
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127 size_t len;
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128 const char *s = luaL_checklstring(L, 1, &len);
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129 char string[1024];
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130 int ret;
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131 if (len >= 1024) {
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132 lua_pushnil(L);
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133 return 1; // TODO return error message
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134 }
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135 strcpy(string, s);
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136 ret = stringprep(string, 1024, 0, profile);
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137 if (ret == STRINGPREP_OK) {
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138 lua_pushstring(L, string);
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139 return 1;
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140 } else {
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141 lua_pushnil(L);
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142 return 1; // TODO return error message
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143 }
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144 }
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145
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146 #define MAKE_PREP_FUNC(myFunc, prep) \
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147 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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148
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149 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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150 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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151 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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152 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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153
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154 static const luaL_Reg Reg_stringprep[] =
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155 {
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156 { "nameprep", Lstringprep_nameprep },
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157 { "nodeprep", Lstringprep_nodeprep },
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158 { "resourceprep", Lstringprep_resourceprep },
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159 { "saslprep", Lstringprep_saslprep },
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160 { NULL, NULL }
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161 };
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162
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163 /***************** IDNA *****************/
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164
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165 #include <idna.h>
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166
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167 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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168 {
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169 size_t len;
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170 const char *s = luaL_checklstring(L, 1, &len);
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171 char* output = NULL;
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172 int ret = idna_to_ascii_8z(s, &output, 0);
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173 if (ret == IDNA_SUCCESS) {
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174 lua_pushstring(L, output);
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175 if (output) free(output);
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176 return 1;
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177 } else {
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178 lua_pushnil(L);
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179 if (output) free(output);
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180 return 1; // TODO return error message
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181 }
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182 }
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183
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184 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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185 {
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186 size_t len;
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187 const char *s = luaL_checklstring(L, 1, &len);
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188 char* output = NULL;
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189 int ret = idna_to_unicode_8z8z(s, &output, 0);
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190 if (ret == IDNA_SUCCESS) {
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191 lua_pushstring(L, output);
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192 if (output) free(output);
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193 return 1;
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194 } else {
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195 lua_pushnil(L);
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196 if (output) free(output);
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197 return 1; // TODO return error message
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198 }
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199 }
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200
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201 static const luaL_Reg Reg_idna[] =
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202 {
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203 { "to_ascii", Lidna_to_ascii },
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204 { "to_unicode", Lidna_to_unicode },
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205 { NULL, NULL }
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206 };
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207
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208 /***************** end *****************/
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209
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210 static const luaL_Reg Reg[] =
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211 {
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212 { NULL, NULL }
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213 };
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214
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215 LUALIB_API int luaopen_util_encodings(lua_State *L)
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216 {
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217 luaL_register(L, "encodings", Reg);
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218
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219 lua_pushliteral(L, "base64");
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220 lua_newtable(L);
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221 luaL_register(L, NULL, Reg_base64);
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222 lua_settable(L,-3);
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223
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224 lua_pushliteral(L, "stringprep");
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225 lua_newtable(L);
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226 luaL_register(L, NULL, Reg_stringprep);
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227 lua_settable(L,-3);
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228
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229 lua_pushliteral(L, "idna");
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230 lua_newtable(L);
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231 luaL_register(L, NULL, Reg_idna);
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232 lua_settable(L,-3);
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233
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234 lua_pushliteral(L, "version"); /** version */
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235 lua_pushliteral(L, "-3.14");
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236 lua_settable(L,-3);
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237 return 1;
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238 }