Wed, 26 Nov 2008 01:45:25 +0500
Added util-src/encodings.c - support for base64, stringprep and idna encodings
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1 | /* |
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2 | * xxpath.c |
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3 | * An implementation of a subset of xpath for Lua 5.1 |
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4 | * Waqas Hussain <waqas20@gmail.com> |
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5 | * 05 Oct 2008 15:28:15 |
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6 | */ |
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7 | |
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8 | #include <string.h> |
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9 | |
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10 | #include "lua.h" |
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11 | #include "lauxlib.h" |
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12 | |
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13 | /*const char* hex_tab = "0123456789abcdef"; |
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14 | void toHex(const char* in, int length, char* out) { |
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15 | int i; |
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16 | for (i = 0; i < length; i++) { |
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17 | out[i*2] = hex_tab[(in[i] >> 4) & 0xF]; |
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18 | out[i*2+1] = hex_tab[(in[i]) & 0xF]; |
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19 | } |
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20 | //out[i*2] = 0; |
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21 | }*/ |
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22 | |
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23 | /***************** BASE64 *****************/ |
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24 | |
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25 | #define uint unsigned int |
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26 | |
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27 | static const char code[]= |
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28 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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29 | |
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30 | static void base64_encode(luaL_Buffer *b, uint c1, uint c2, uint c3, int n) |
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31 | { |
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32 | unsigned long tuple=c3+256UL*(c2+256UL*c1); |
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33 | int i; |
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34 | char s[4]; |
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35 | for (i=0; i<4; i++) { |
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36 | s[3-i] = code[tuple % 64]; |
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37 | tuple /= 64; |
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38 | } |
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39 | for (i=n+1; i<4; i++) s[i]='='; |
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40 | luaL_addlstring(b,s,4); |
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41 | } |
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42 | |
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43 | static int Lbase64_encode(lua_State *L) /** encode(s) */ |
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44 | { |
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45 | size_t l; |
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46 | const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l); |
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47 | luaL_Buffer b; |
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48 | int n; |
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49 | luaL_buffinit(L,&b); |
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50 | for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3); |
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51 | switch (l%3) |
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52 | { |
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53 | case 1: base64_encode(&b,s[0],0,0,1); break; |
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54 | case 2: base64_encode(&b,s[0],s[1],0,2); break; |
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55 | } |
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56 | luaL_pushresult(&b); |
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57 | return 1; |
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58 | } |
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59 | |
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60 | static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n) |
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61 | { |
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62 | unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1)); |
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63 | char s[3]; |
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64 | switch (--n) |
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65 | { |
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66 | case 3: s[2]=tuple; |
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67 | case 2: s[1]=tuple >> 8; |
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68 | case 1: s[0]=tuple >> 16; |
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69 | } |
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70 | luaL_addlstring(b,s,n); |
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71 | } |
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72 | |
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73 | static int Lbase64_decode(lua_State *L) /** decode(s) */ |
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74 | { |
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75 | size_t l; |
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76 | const char *s=luaL_checklstring(L,1,&l); |
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77 | luaL_Buffer b; |
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78 | int n=0; |
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79 | char t[4]; |
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80 | luaL_buffinit(L,&b); |
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81 | for (;;) |
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82 | { |
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83 | int c=*s++; |
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84 | switch (c) |
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85 | { |
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86 | const char *p; |
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87 | default: |
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88 | p=strchr(code,c); if (p==NULL) return 0; |
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89 | t[n++]= p-code; |
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90 | if (n==4) |
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91 | { |
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92 | base64_decode(&b,t[0],t[1],t[2],t[3],4); |
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93 | n=0; |
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94 | } |
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95 | break; |
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96 | case '=': |
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97 | switch (n) |
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98 | { |
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99 | case 1: base64_decode(&b,t[0],0,0,0,1); break; |
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100 | case 2: base64_decode(&b,t[0],t[1],0,0,2); break; |
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101 | case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break; |
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102 | } |
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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 | return 0; |
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111 | } |
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112 | |
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113 | static const luaL_Reg Reg_base64[] = |
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114 | { |
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115 | { "encode", Lbase64_encode }, |
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116 | { "decode", Lbase64_decode }, |
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117 | { NULL, NULL } |
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118 | }; |
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119 | |
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120 | /***************** STRINGPREP *****************/ |
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121 | |
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122 | #include <stringprep.h> |
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123 | |
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124 | static int stringprep_prep(lua_State *L, const Stringprep_profile *profile) |
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125 | { |
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126 | size_t len; |
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127 | const char *s = luaL_checklstring(L, 1, &len); |
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128 | char string[1024]; |
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129 | int ret; |
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130 | if (len >= 1024) { |
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131 | lua_pushnil(L); |
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132 | return 1; // TODO return error message |
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133 | } |
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134 | strcpy(string, s); |
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135 | ret = stringprep(string, 1024, 0, profile); |
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136 | if (ret == STRINGPREP_OK) { |
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137 | lua_pushstring(L, string); |
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138 | return 1; |
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139 | } else { |
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140 | lua_pushnil(L); |
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141 | return 1; // TODO return error message |
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142 | } |
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143 | } |
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144 | |
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145 | #define MAKE_PREP_FUNC(myFunc, prep) \ |
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146 | static int myFunc(lua_State *L) { return stringprep_prep(L, prep); } |
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147 | |
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148 | MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */ |
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149 | MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */ |
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150 | MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */ |
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151 | MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */ |
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152 | |
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153 | static const luaL_Reg Reg_stringprep[] = |
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154 | { |
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155 | { "nameprep", Lstringprep_nameprep }, |
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156 | { "nodeprep", Lstringprep_nodeprep }, |
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157 | { "resourceprep", Lstringprep_resourceprep }, |
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158 | { "saslprep", Lstringprep_saslprep }, |
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159 | { NULL, NULL } |
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160 | }; |
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161 | |
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162 | /***************** IDNA *****************/ |
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163 | |
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164 | #include <idna.h> |
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165 | |
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166 | static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */ |
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167 | { |
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168 | size_t len; |
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169 | const char *s = luaL_checklstring(L, 1, &len); |
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170 | char* output = NULL; |
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171 | int ret = idna_to_ascii_8z(s, &output, 0); |
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172 | if (ret == IDNA_SUCCESS) { |
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173 | lua_pushstring(L, output); |
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174 | if (output) free(output); |
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175 | return 1; |
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176 | } else { |
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177 | lua_pushnil(L); |
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178 | if (output) free(output); |
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179 | return 1; // TODO return error message |
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180 | } |
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181 | } |
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182 | |
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183 | static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */ |
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184 | { |
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185 | size_t len; |
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186 | const char *s = luaL_checklstring(L, 1, &len); |
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187 | char* output = NULL; |
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188 | int ret = idna_to_unicode_8z8z(s, &output, 0); |
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189 | if (ret == IDNA_SUCCESS) { |
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190 | lua_pushstring(L, output); |
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191 | if (output) free(output); |
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192 | return 1; |
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193 | } else { |
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194 | lua_pushnil(L); |
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195 | if (output) free(output); |
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196 | return 1; // TODO return error message |
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197 | } |
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198 | } |
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199 | |
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200 | static const luaL_Reg Reg_idna[] = |
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201 | { |
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202 | { "to_ascii", Lidna_to_ascii }, |
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203 | { "to_unicode", Lidna_to_unicode }, |
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204 | { NULL, NULL } |
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205 | }; |
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206 | |
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207 | /***************** end *****************/ |
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208 | |
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209 | static const luaL_Reg Reg[] = |
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210 | { |
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211 | { NULL, NULL } |
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212 | }; |
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213 | |
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214 | LUALIB_API int luaopen_encodings(lua_State *L) |
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215 | { |
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216 | luaL_register(L, "encodings", Reg); |
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217 | |
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218 | lua_pushliteral(L, "base64"); |
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219 | lua_newtable(L); |
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220 | luaL_register(L, NULL, Reg_base64); |
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221 | lua_settable(L,-3); |
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222 | |
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223 | lua_pushliteral(L, "stringprep"); |
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224 | lua_newtable(L); |
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225 | luaL_register(L, NULL, Reg_stringprep); |
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226 | lua_settable(L,-3); |
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227 | |
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228 | lua_pushliteral(L, "idna"); |
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229 | lua_newtable(L); |
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230 | luaL_register(L, NULL, Reg_idna); |
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231 | lua_settable(L,-3); |
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232 | |
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233 | lua_pushliteral(L, "version"); /** version */ |
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234 | lua_pushliteral(L, "-3.14"); |
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235 | lua_settable(L,-3); |
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236 | return 1; |
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237 | } |