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util-src/encodings.c @ 11531:2bd91d4a0fcf
core.certmanager: Check for complete filename
Prevents a false positive match on files with fullchain.pem as suffix
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 10 Apr 2021 14:45:03 +0200 |
parent | 10921:6eb5d2bb11af |
child | 12575:1f6f05a98fcd |
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 -- Copyright (C) 1994-2015 Lua.org, PUC-Rio. |
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5 -- |
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6 -- This project is MIT/X11 licensed. Please see the |
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7 -- COPYING file in the source package for more information. |
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8 -- |
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9 */ |
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10 |
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11 /* |
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12 * encodings.c |
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13 * Lua library for base64, stringprep and idna encodings |
520 | 14 */ |
15 | |
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16 /* Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way */ |
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17 #define _CRT_SECURE_NO_DEPRECATE |
520 | 18 |
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19 #include <string.h> |
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20 #include <stdlib.h> |
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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 #if (LUA_VERSION_NUM == 501) |
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25 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R) |
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26 #endif |
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27 #if (LUA_VERSION_NUM < 504) |
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28 #define luaL_pushfail lua_pushnil |
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29 #endif |
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30 |
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31 /***************** BASE64 *****************/ |
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32 |
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33 static const char code[] = |
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34 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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35 |
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36 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n) { |
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37 unsigned long tuple = c3 + 256UL * (c2 + 256UL * c1); |
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38 int i; |
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39 char s[4]; |
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40 |
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41 for(i = 0; i < 4; i++) { |
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42 s[3 - i] = code[tuple % 64]; |
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43 tuple /= 64; |
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44 } |
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45 |
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46 for(i = n + 1; i < 4; i++) { |
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47 s[i] = '='; |
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48 } |
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49 |
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50 luaL_addlstring(b, s, 4); |
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51 } |
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52 |
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53 static int Lbase64_encode(lua_State *L) { /** encode(s) */ |
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54 size_t l; |
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55 const unsigned char *s = (const unsigned char *)luaL_checklstring(L, 1, &l); |
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56 luaL_Buffer b; |
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57 int n; |
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58 luaL_buffinit(L, &b); |
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59 |
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60 for(n = l / 3; n--; s += 3) { |
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61 base64_encode(&b, s[0], s[1], s[2], 3); |
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62 } |
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63 |
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64 switch(l % 3) { |
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65 case 1: |
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66 base64_encode(&b, s[0], 0, 0, 1); |
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67 break; |
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68 |
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69 case 2: |
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70 base64_encode(&b, s[0], s[1], 0, 2); |
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71 break; |
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72 } |
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73 |
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74 luaL_pushresult(&b); |
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75 return 1; |
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76 } |
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77 |
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78 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n) { |
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79 unsigned long tuple = c4 + 64L * (c3 + 64L * (c2 + 64L * c1)); |
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80 char s[3]; |
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81 |
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82 switch(--n) { |
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83 case 3: |
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84 s[2] = (char) tuple; |
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85 /* Falls through. */ |
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86 |
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87 case 2: |
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88 s[1] = (char)(tuple >> 8); |
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89 /* Falls through. */ |
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90 |
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91 case 1: |
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92 s[0] = (char)(tuple >> 16); |
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93 } |
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94 |
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95 luaL_addlstring(b, s, n); |
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96 } |
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97 |
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98 static int Lbase64_decode(lua_State *L) { /** decode(s) */ |
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99 size_t l; |
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100 const char *s = luaL_checklstring(L, 1, &l); |
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101 luaL_Buffer b; |
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102 int n = 0; |
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103 char t[4]; |
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104 luaL_buffinit(L, &b); |
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105 |
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106 for(;;) { |
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107 int c = *s++; |
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108 |
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109 switch(c) { |
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110 const char *p; |
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111 |
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112 default: |
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113 p = strchr(code, c); |
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114 |
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115 if(p == NULL) { |
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116 return 0; |
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117 } |
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118 |
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119 t[n++] = (char)(p - code); |
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120 |
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121 if(n == 4) { |
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122 base64_decode(&b, t[0], t[1], t[2], t[3], 4); |
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123 n = 0; |
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124 } |
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125 |
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126 break; |
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127 |
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128 case '=': |
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129 |
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130 switch(n) { |
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131 case 1: |
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132 base64_decode(&b, t[0], 0, 0, 0, 1); |
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133 break; |
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134 |
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135 case 2: |
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136 base64_decode(&b, t[0], t[1], 0, 0, 2); |
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137 break; |
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138 |
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139 case 3: |
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140 base64_decode(&b, t[0], t[1], t[2], 0, 3); |
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141 break; |
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142 } |
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143 |
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144 n = 0; |
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145 break; |
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146 |
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147 case 0: |
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148 luaL_pushresult(&b); |
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149 return 1; |
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150 |
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151 case '\n': |
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152 case '\r': |
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153 case '\t': |
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154 case ' ': |
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155 case '\f': |
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156 case '\b': |
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157 break; |
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158 } |
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159 } |
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160 } |
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161 |
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162 static const luaL_Reg Reg_base64[] = { |
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163 { "encode", Lbase64_encode }, |
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164 { "decode", Lbase64_decode }, |
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165 { NULL, NULL } |
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166 }; |
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167 |
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168 /******************* UTF-8 ********************/ |
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169 |
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170 /* |
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171 * Adapted from Lua 5.3 |
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172 * Needed because libidn does not validate that input is valid UTF-8 |
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173 */ |
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174 |
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175 #define MAXUNICODE 0x10FFFF |
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176 |
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177 /* |
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178 * Decode one UTF-8 sequence, returning NULL if byte sequence is invalid. |
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179 */ |
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180 static const char *utf8_decode(const char *o, int *val) { |
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181 static const unsigned int limits[] = {0xFF, 0x7F, 0x7FF, 0xFFFF}; |
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182 const unsigned char *s = (const unsigned char *)o; |
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183 unsigned int c = s[0]; |
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184 unsigned int res = 0; /* final result */ |
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185 |
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186 if(c < 0x80) { /* ascii? */ |
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187 res = c; |
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188 } else { |
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189 int count = 0; /* to count number of continuation bytes */ |
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190 |
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191 while(c & 0x40) { /* still have continuation bytes? */ |
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192 int cc = s[++count]; /* read next byte */ |
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193 |
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194 if((cc & 0xC0) != 0x80) { /* not a continuation byte? */ |
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195 return NULL; /* invalid byte sequence */ |
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196 } |
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197 |
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198 res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */ |
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199 c <<= 1; /* to test next bit */ |
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200 } |
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201 |
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202 res |= ((c & 0x7F) << (count * 5)); /* add first byte */ |
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203 |
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204 if(count > 3 || res > MAXUNICODE || res <= limits[count] || (0xd800 <= res && res <= 0xdfff)) { |
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205 return NULL; /* invalid byte sequence */ |
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206 } |
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207 |
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208 s += count; /* skip continuation bytes read */ |
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209 } |
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210 |
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211 if(val) { |
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212 *val = res; |
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213 } |
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214 |
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215 return (const char *)s + 1; /* +1 to include first byte */ |
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216 } |
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217 |
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218 /* |
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219 * Check that a string is valid UTF-8 |
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220 * Returns NULL if not |
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221 */ |
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222 static const char *check_utf8(lua_State *L, int idx, size_t *l) { |
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223 size_t pos, len; |
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224 const char *s = luaL_checklstring(L, idx, &len); |
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225 pos = 0; |
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226 |
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227 while(pos <= len) { |
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228 const char *s1 = utf8_decode(s + pos, NULL); |
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229 |
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230 if(s1 == NULL) { /* conversion error? */ |
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231 return NULL; |
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232 } |
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233 |
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234 pos = s1 - s; |
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235 } |
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236 |
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237 if(l != NULL) { |
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238 *l = len; |
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239 } |
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240 |
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241 return s; |
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242 } |
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243 |
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244 static int Lutf8_valid(lua_State *L) { |
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245 lua_pushboolean(L, check_utf8(L, 1, NULL) != NULL); |
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246 return 1; |
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247 } |
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248 |
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249 static int Lutf8_length(lua_State *L) { |
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250 size_t len; |
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251 |
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252 if(!check_utf8(L, 1, &len)) { |
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253 luaL_pushfail(L); |
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254 lua_pushliteral(L, "invalid utf8"); |
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255 return 2; |
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256 } |
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257 |
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258 lua_pushinteger(L, len); |
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259 return 1; |
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260 } |
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261 |
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262 static const luaL_Reg Reg_utf8[] = { |
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263 { "valid", Lutf8_valid }, |
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264 { "length", Lutf8_length }, |
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265 { NULL, NULL } |
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266 }; |
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267 |
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268 /***************** STRINGPREP *****************/ |
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269 #ifdef USE_STRINGPREP_ICU |
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270 |
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271 #include <unicode/usprep.h> |
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272 #include <unicode/ustring.h> |
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273 #include <unicode/utrace.h> |
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274 #include <unicode/uspoof.h> |
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275 #include <unicode/uidna.h> |
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276 |
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277 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile) { |
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278 size_t input_len; |
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279 int32_t unprepped_len, prepped_len, output_len; |
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280 const char *input; |
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281 char output[1024]; |
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282 int flags = USPREP_ALLOW_UNASSIGNED; |
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283 |
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284 UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */ |
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285 UChar prepped[1024]; |
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286 |
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287 UErrorCode err = U_ZERO_ERROR; |
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288 |
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289 input = luaL_checklstring(L, 1, &input_len); |
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290 |
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291 if(input_len >= 1024) { |
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292 luaL_pushfail(L); |
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293 return 1; |
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294 } |
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295 |
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296 /* strict */ |
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297 if(!lua_isnoneornil(L, 2)) { |
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298 luaL_checktype(L, 2, LUA_TBOOLEAN); |
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299 if(lua_toboolean(L, 2)) { |
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300 flags = 0; |
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301 } |
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302 } |
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303 |
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304 u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err); |
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305 |
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306 if(U_FAILURE(err)) { |
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307 luaL_pushfail(L); |
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308 return 1; |
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309 } |
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310 |
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311 prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, flags, NULL, &err); |
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312 |
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313 if(U_FAILURE(err)) { |
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314 luaL_pushfail(L); |
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315 return 1; |
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316 } else { |
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317 u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err); |
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318 |
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319 if(U_SUCCESS(err) && output_len < 1024) { |
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320 lua_pushlstring(L, output, output_len); |
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321 } else { |
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322 luaL_pushfail(L); |
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323 } |
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324 |
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325 return 1; |
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326 } |
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327 } |
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328 |
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329 static UStringPrepProfile *icu_nameprep; |
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330 static UStringPrepProfile *icu_nodeprep; |
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331 static UStringPrepProfile *icu_resourceprep; |
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332 static UStringPrepProfile *icu_saslprep; |
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333 static USpoofChecker *icu_spoofcheck; |
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334 static UIDNA *icu_idna2008; |
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335 |
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336 #if (U_ICU_VERSION_MAJOR_NUM < 58) |
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337 /* COMPAT */ |
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338 #define USPOOF_CONFUSABLE (USPOOF_SINGLE_SCRIPT_CONFUSABLE | USPOOF_MIXED_SCRIPT_CONFUSABLE | USPOOF_WHOLE_SCRIPT_CONFUSABLE) |
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339 #endif |
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340 |
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341 /* initialize global ICU stringprep profiles */ |
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342 static void init_icu(void) { |
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343 UErrorCode err = U_ZERO_ERROR; |
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344 utrace_setLevel(UTRACE_VERBOSE); |
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345 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err); |
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346 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err); |
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347 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err); |
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348 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err); |
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349 icu_spoofcheck = uspoof_open(&err); |
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350 uspoof_setChecks(icu_spoofcheck, USPOOF_CONFUSABLE, &err); |
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351 int options = UIDNA_DEFAULT; |
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352 #if 0 |
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353 /* COMPAT with future Unicode versions */ |
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354 options |= UIDNA_ALLOW_UNASSIGNED; |
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355 #endif |
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356 #if 1 |
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357 /* Forbid eg labels starting with _ */ |
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358 options |= UIDNA_USE_STD3_RULES; |
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359 #endif |
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360 #if 0 |
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361 /* TODO determine if we need this */ |
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362 options |= UIDNA_CHECK_BIDI; |
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363 #endif |
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364 #if 0 |
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365 /* UTS46 makes it sound like these are the responsibility of registrars */ |
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366 options |= UIDNA_CHECK_CONTEXTJ; |
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367 options |= UIDNA_CHECK_CONTEXTO; |
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368 #endif |
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369 #if 0 |
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370 /* This disables COMPAT with IDNA 2003 */ |
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371 options |= UIDNA_NONTRANSITIONAL_TO_ASCII; |
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372 options |= UIDNA_NONTRANSITIONAL_TO_UNICODE; |
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373 #endif |
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374 icu_idna2008 = uidna_openUTS46(options, &err); |
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375 |
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376 if(U_FAILURE(err)) { |
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377 fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName(err)); |
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378 } |
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379 } |
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380 |
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381 #define MAKE_PREP_FUNC(myFunc, prep) \ |
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382 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); } |
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383 |
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384 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */ |
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385 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */ |
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386 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */ |
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387 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */ |
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388 |
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389 static const luaL_Reg Reg_stringprep[] = { |
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390 { "nameprep", Lstringprep_nameprep }, |
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391 { "nodeprep", Lstringprep_nodeprep }, |
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392 { "resourceprep", Lstringprep_resourceprep }, |
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393 { "saslprep", Lstringprep_saslprep }, |
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394 { NULL, NULL } |
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395 }; |
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396 #else /* USE_STRINGPREP_ICU */ |
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397 |
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398 /****************** libidn ********************/ |
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399 |
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400 #include <stringprep.h> |
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401 |
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402 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile) { |
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403 size_t len; |
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404 const char *s; |
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405 char string[1024]; |
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406 int ret; |
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407 Stringprep_profile_flags flags = 0; |
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408 |
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409 s = check_utf8(L, 1, &len); |
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410 |
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411 /* strict */ |
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412 if(!lua_isnoneornil(L, 2)) { |
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413 luaL_checktype(L, 2, LUA_TBOOLEAN); |
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414 if(lua_toboolean(L, 2)) { |
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415 flags = STRINGPREP_NO_UNASSIGNED; |
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416 } |
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417 } |
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418 |
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419 if(s == NULL || len >= 1024 || len != strlen(s)) { |
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420 luaL_pushfail(L); |
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421 return 1; /* TODO return error message */ |
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422 } |
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423 |
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424 strcpy(string, s); |
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425 ret = stringprep(string, 1024, flags, profile); |
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426 |
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427 if(ret == STRINGPREP_OK) { |
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428 lua_pushstring(L, string); |
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429 return 1; |
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430 } else { |
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431 luaL_pushfail(L); |
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432 return 1; /* TODO return error message */ |
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433 } |
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434 } |
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435 |
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436 #define MAKE_PREP_FUNC(myFunc, prep) \ |
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437 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); } |
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438 |
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439 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */ |
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440 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */ |
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441 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */ |
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442 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */ |
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443 |
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444 static const luaL_Reg Reg_stringprep[] = { |
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445 { "nameprep", Lstringprep_nameprep }, |
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446 { "nodeprep", Lstringprep_nodeprep }, |
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447 { "resourceprep", Lstringprep_resourceprep }, |
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448 { "saslprep", Lstringprep_saslprep }, |
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449 { NULL, NULL } |
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450 }; |
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451 #endif |
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452 |
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453 /***************** IDNA *****************/ |
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454 #ifdef USE_STRINGPREP_ICU |
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455 #include <unicode/ustdio.h> |
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456 #include <unicode/uidna.h> |
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457 /* IDNA2003 or IDNA2008 ? ? ? */ |
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458 static int Lidna_to_ascii(lua_State *L) { /** idna.to_ascii(s) */ |
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459 size_t len; |
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460 int32_t ulen, dest_len, output_len; |
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461 const char *s = luaL_checklstring(L, 1, &len); |
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462 UChar ustr[1024]; |
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463 UErrorCode err = U_ZERO_ERROR; |
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464 UChar dest[1024]; |
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465 char output[1024]; |
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466 |
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467 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err); |
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468 |
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469 if(U_FAILURE(err)) { |
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470 luaL_pushfail(L); |
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471 return 1; |
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472 } |
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473 |
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474 UIDNAInfo info = UIDNA_INFO_INITIALIZER; |
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475 dest_len = uidna_nameToASCII(icu_idna2008, ustr, ulen, dest, 256, &info, &err); |
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476 |
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477 if(U_FAILURE(err) || info.errors) { |
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478 luaL_pushfail(L); |
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479 return 1; |
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480 } else { |
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481 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err); |
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482 |
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483 if(U_SUCCESS(err) && output_len < 1024) { |
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484 lua_pushlstring(L, output, output_len); |
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485 } else { |
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486 luaL_pushfail(L); |
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487 } |
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488 |
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489 return 1; |
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490 } |
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491 } |
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492 |
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493 static int Lidna_to_unicode(lua_State *L) { /** idna.to_unicode(s) */ |
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494 size_t len; |
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495 int32_t ulen, dest_len, output_len; |
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496 const char *s = luaL_checklstring(L, 1, &len); |
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497 UChar ustr[1024]; |
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498 UErrorCode err = U_ZERO_ERROR; |
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499 UChar dest[1024]; |
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500 char output[1024]; |
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501 |
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502 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err); |
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503 |
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504 if(U_FAILURE(err)) { |
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505 luaL_pushfail(L); |
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506 return 1; |
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507 } |
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508 |
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509 UIDNAInfo info = UIDNA_INFO_INITIALIZER; |
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510 dest_len = uidna_nameToUnicode(icu_idna2008, ustr, ulen, dest, 1024, &info, &err); |
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511 |
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512 if(U_FAILURE(err) || info.errors) { |
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513 luaL_pushfail(L); |
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514 return 1; |
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515 } else { |
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516 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err); |
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517 |
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518 if(U_SUCCESS(err) && output_len < 1024) { |
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519 lua_pushlstring(L, output, output_len); |
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520 } else { |
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521 luaL_pushfail(L); |
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522 } |
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523 |
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524 return 1; |
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525 } |
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526 } |
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527 |
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528 static int Lskeleton(lua_State *L) { |
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529 size_t len; |
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530 int32_t ulen, dest_len, output_len; |
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531 const char *s = luaL_checklstring(L, 1, &len); |
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532 UErrorCode err = U_ZERO_ERROR; |
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533 UChar ustr[1024]; |
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534 UChar dest[1024]; |
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535 char output[1024]; |
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536 |
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537 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err); |
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538 |
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539 if(U_FAILURE(err)) { |
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540 luaL_pushfail(L); |
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541 return 1; |
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542 } |
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543 |
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544 dest_len = uspoof_getSkeleton(icu_spoofcheck, 0, ustr, ulen, dest, 1024, &err); |
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545 |
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546 if(U_FAILURE(err)) { |
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547 luaL_pushfail(L); |
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548 return 1; |
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549 } |
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550 |
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551 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err); |
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552 |
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553 if(U_SUCCESS(err)) { |
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554 lua_pushlstring(L, output, output_len); |
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555 return 1; |
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556 } |
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557 |
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558 luaL_pushfail(L); |
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559 return 1; |
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560 } |
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561 |
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562 #else /* USE_STRINGPREP_ICU */ |
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563 /****************** libidn ********************/ |
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564 |
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565 #include <idna.h> |
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566 #include <idn-free.h> |
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567 |
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568 static int Lidna_to_ascii(lua_State *L) { /** idna.to_ascii(s) */ |
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569 size_t len; |
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570 const char *s = check_utf8(L, 1, &len); |
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571 char *output = NULL; |
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572 int ret; |
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573 |
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574 if(s == NULL || len != strlen(s)) { |
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575 luaL_pushfail(L); |
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576 return 1; /* TODO return error message */ |
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577 } |
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578 |
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579 ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES); |
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580 |
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581 if(ret == IDNA_SUCCESS) { |
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582 lua_pushstring(L, output); |
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583 idn_free(output); |
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584 return 1; |
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585 } else { |
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586 luaL_pushfail(L); |
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587 idn_free(output); |
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588 return 1; /* TODO return error message */ |
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589 } |
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590 } |
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591 |
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592 static int Lidna_to_unicode(lua_State *L) { /** idna.to_unicode(s) */ |
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593 size_t len; |
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594 const char *s = luaL_checklstring(L, 1, &len); |
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595 char *output = NULL; |
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596 int ret = idna_to_unicode_8z8z(s, &output, 0); |
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597 |
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598 if(ret == IDNA_SUCCESS) { |
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599 lua_pushstring(L, output); |
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600 idn_free(output); |
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601 return 1; |
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602 } else { |
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603 luaL_pushfail(L); |
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604 idn_free(output); |
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605 return 1; /* TODO return error message */ |
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606 } |
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607 } |
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608 #endif |
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609 |
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610 static const luaL_Reg Reg_idna[] = { |
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611 { "to_ascii", Lidna_to_ascii }, |
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612 { "to_unicode", Lidna_to_unicode }, |
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613 { NULL, NULL } |
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614 }; |
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615 |
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616 /***************** end *****************/ |
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617 |
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618 LUALIB_API int luaopen_util_encodings(lua_State *L) { |
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619 #if (LUA_VERSION_NUM > 501) |
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620 luaL_checkversion(L); |
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621 #endif |
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622 #ifdef USE_STRINGPREP_ICU |
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623 init_icu(); |
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624 #endif |
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625 lua_newtable(L); |
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626 |
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627 lua_newtable(L); |
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628 luaL_setfuncs(L, Reg_base64, 0); |
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629 lua_setfield(L, -2, "base64"); |
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630 |
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631 lua_newtable(L); |
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632 luaL_setfuncs(L, Reg_stringprep, 0); |
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633 lua_setfield(L, -2, "stringprep"); |
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634 |
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635 lua_newtable(L); |
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636 luaL_setfuncs(L, Reg_idna, 0); |
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637 lua_setfield(L, -2, "idna"); |
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638 |
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639 lua_newtable(L); |
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640 luaL_setfuncs(L, Reg_utf8, 0); |
6604 | 641 lua_setfield(L, -2, "utf8"); |
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642 |
9976
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643 #ifdef USE_STRINGPREP_ICU |
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644 lua_newtable(L); |
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645 lua_pushcfunction(L, Lskeleton); |
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646 lua_setfield(L, -2, "skeleton"); |
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647 lua_setfield(L, -2, "confusable"); |
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648 #endif |
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649 |
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|
650 lua_pushliteral(L, "-3.14"); |
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651 lua_setfield(L, -2, "version"); |
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652 return 1; |
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|
653 } |