prosody
22b0e654c4cf
util-src/encodings.c

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util-src/encodings.c @ 473:22b0e654c4cf

To use free you should include stdlib.h rather than malloc.h according to man page of free() and various C reference websites.
author Tobias Markmann <tm@ayena.de>
date Fri, 28 Nov 2008 18:36:04 +0100
parent 441:4089b62b510c
child 474:666e22848890
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * encodings.c
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3 * Lua library for base64, stringprep and idna encodings
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4 */
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5
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6 // Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way
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7 #define _CRT_SECURE_NO_DEPRECATE
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8
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9 #include <string.h>
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10 #include <stdlib.h>
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11
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12 #include "lua.h"
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13 #include "lauxlib.h"
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14
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15 /***************** BASE64 *****************/
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16
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17 #define uint unsigned int
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18
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19 static const char code[]=
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20 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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21
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22 static void base64_encode(luaL_Buffer *b, uint c1, uint c2, uint c3, int n)
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23 {
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24 unsigned long tuple=c3+256UL*(c2+256UL*c1);
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25 int i;
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26 char s[4];
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27 for (i=0; i<4; i++) {
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28 s[3-i] = code[tuple % 64];
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29 tuple /= 64;
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30 }
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31 for (i=n+1; i<4; i++) s[i]='=';
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32 luaL_addlstring(b,s,4);
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33 }
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34
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35 static int Lbase64_encode(lua_State *L) /** encode(s) */
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36 {
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37 size_t l;
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38 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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39 luaL_Buffer b;
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40 int n;
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41 luaL_buffinit(L,&b);
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42 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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43 switch (l%3)
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44 {
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45 case 1: base64_encode(&b,s[0],0,0,1); break;
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46 case 2: base64_encode(&b,s[0],s[1],0,2); break;
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47 }
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48 luaL_pushresult(&b);
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49 return 1;
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50 }
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51
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52 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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53 {
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54 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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55 char s[3];
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56 switch (--n)
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57 {
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58 case 3: s[2]=(char) tuple;
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59 case 2: s[1]=(char) (tuple >> 8);
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60 case 1: s[0]=(char) (tuple >> 16);
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61 }
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62 luaL_addlstring(b,s,n);
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63 }
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64
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65 static int Lbase64_decode(lua_State *L) /** decode(s) */
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66 {
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67 size_t l;
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68 const char *s=luaL_checklstring(L,1,&l);
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69 luaL_Buffer b;
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70 int n=0;
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71 char t[4];
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72 luaL_buffinit(L,&b);
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73 for (;;)
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74 {
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75 int c=*s++;
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76 switch (c)
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77 {
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78 const char *p;
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79 default:
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80 p=strchr(code,c); if (p==NULL) return 0;
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81 t[n++]= (char) (p-code);
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82 if (n==4)
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83 {
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84 base64_decode(&b,t[0],t[1],t[2],t[3],4);
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85 n=0;
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86 }
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87 break;
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88 case '=':
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89 switch (n)
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90 {
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91 case 1: base64_decode(&b,t[0],0,0,0,1); break;
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92 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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93 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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94 }
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95 case 0:
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96 luaL_pushresult(&b);
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97 return 1;
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98 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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99 break;
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100 }
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101 }
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102 return 0;
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103 }
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104
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105 static const luaL_Reg Reg_base64[] =
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106 {
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107 { "encode", Lbase64_encode },
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108 { "decode", Lbase64_decode },
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109 { NULL, NULL }
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110 };
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111
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112 /***************** STRINGPREP *****************/
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113
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114 #include <stringprep.h>
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115
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116 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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117 {
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118 size_t len;
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119 const char *s = luaL_checklstring(L, 1, &len);
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120 char string[1024];
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121 int ret;
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122 if (len >= 1024) {
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123 lua_pushnil(L);
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124 return 1; // TODO return error message
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125 }
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126 strcpy(string, s);
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127 ret = stringprep(string, 1024, 0, profile);
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128 if (ret == STRINGPREP_OK) {
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129 lua_pushstring(L, string);
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130 return 1;
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131 } else {
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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 }
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136
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137 #define MAKE_PREP_FUNC(myFunc, prep) \
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138 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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139
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140 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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141 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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142 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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143 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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144
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145 static const luaL_Reg Reg_stringprep[] =
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146 {
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147 { "nameprep", Lstringprep_nameprep },
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148 { "nodeprep", Lstringprep_nodeprep },
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149 { "resourceprep", Lstringprep_resourceprep },
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150 { "saslprep", Lstringprep_saslprep },
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151 { NULL, NULL }
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152 };
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153
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154 /***************** IDNA *****************/
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155
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156 #include <idna.h>
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157
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158 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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159 {
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160 size_t len;
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161 const char *s = luaL_checklstring(L, 1, &len);
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162 char* output = NULL;
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163 int ret = idna_to_ascii_8z(s, &output, 0);
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164 if (ret == IDNA_SUCCESS) {
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165 lua_pushstring(L, output);
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166 if (output) free(output);
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167 return 1;
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168 } else {
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169 lua_pushnil(L);
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170 if (output) free(output);
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171 return 1; // TODO return error message
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172 }
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173 }
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174
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175 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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176 {
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177 size_t len;
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178 const char *s = luaL_checklstring(L, 1, &len);
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179 char* output = NULL;
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180 int ret = idna_to_unicode_8z8z(s, &output, 0);
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181 if (ret == IDNA_SUCCESS) {
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182 lua_pushstring(L, output);
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183 if (output) free(output);
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184 return 1;
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185 } else {
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186 lua_pushnil(L);
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187 if (output) free(output);
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188 return 1; // TODO return error message
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189 }
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190 }
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191
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192 static const luaL_Reg Reg_idna[] =
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193 {
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194 { "to_ascii", Lidna_to_ascii },
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195 { "to_unicode", Lidna_to_unicode },
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196 { NULL, NULL }
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197 };
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198
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199 /***************** end *****************/
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200
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201 static const luaL_Reg Reg[] =
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202 {
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203 { NULL, NULL }
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204 };
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205
432
fb19a5c14d44 Fix for hashes.c and encodings.c to rename luaopen for util_*
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206 LUALIB_API int luaopen_util_encodings(lua_State *L)
415
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207 {
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208 luaL_register(L, "encodings", Reg);
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209
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210 lua_pushliteral(L, "base64");
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211 lua_newtable(L);
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212 luaL_register(L, NULL, Reg_base64);
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213 lua_settable(L,-3);
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214
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215 lua_pushliteral(L, "stringprep");
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216 lua_newtable(L);
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217 luaL_register(L, NULL, Reg_stringprep);
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218 lua_settable(L,-3);
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219
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220 lua_pushliteral(L, "idna");
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221 lua_newtable(L);
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222 luaL_register(L, NULL, Reg_idna);
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223 lua_settable(L,-3);
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224
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225 lua_pushliteral(L, "version"); /** version */
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226 lua_pushliteral(L, "-3.14");
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227 lua_settable(L,-3);
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228 return 1;
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229 }