prosody
bb9583314ec7
util-src/encodings.c

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util-src/encodings.c @ 707:bb9583314ec7

mod_muc: deregister component on unload
author Waqas Hussain <waqas20@gmail.com>
date Tue, 13 Jan 2009 20:18:20 +0500
parent 601:6cb908ef01c8
child 766:433a5226267f
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520
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1 /* Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 */
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19
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20
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21 /*
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22 * encodings.c
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23 * Lua library for base64, stringprep and idna encodings
415
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24 */
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25
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26 // Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way
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27 #define _CRT_SECURE_NO_DEPRECATE
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28
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29 #include <string.h>
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30 #include <stdlib.h>
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31
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32 #include "lua.h"
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33 #include "lauxlib.h"
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34
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35 /***************** BASE64 *****************/
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36
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37 static const char code[]=
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38 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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39
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40 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
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41 {
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42 unsigned long tuple=c3+256UL*(c2+256UL*c1);
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43 int i;
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44 char s[4];
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45 for (i=0; i<4; i++) {
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46 s[3-i] = code[tuple % 64];
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47 tuple /= 64;
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48 }
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49 for (i=n+1; i<4; i++) s[i]='=';
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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 {
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55 size_t l;
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56 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
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57 luaL_Buffer b;
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58 int n;
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59 luaL_buffinit(L,&b);
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60 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
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61 switch (l%3)
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62 {
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63 case 1: base64_encode(&b,s[0],0,0,1); break;
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64 case 2: base64_encode(&b,s[0],s[1],0,2); break;
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65 }
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66 luaL_pushresult(&b);
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67 return 1;
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68 }
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69
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70 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
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71 {
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72 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
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73 char s[3];
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74 switch (--n)
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75 {
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76 case 3: s[2]=(char) tuple;
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77 case 2: s[1]=(char) (tuple >> 8);
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78 case 1: s[0]=(char) (tuple >> 16);
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79 }
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80 luaL_addlstring(b,s,n);
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81 }
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82
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83 static int Lbase64_decode(lua_State *L) /** decode(s) */
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84 {
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85 size_t l;
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86 const char *s=luaL_checklstring(L,1,&l);
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87 luaL_Buffer b;
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88 int n=0;
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89 char t[4];
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90 luaL_buffinit(L,&b);
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91 for (;;)
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92 {
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93 int c=*s++;
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94 switch (c)
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95 {
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96 const char *p;
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97 default:
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98 p=strchr(code,c); if (p==NULL) return 0;
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99 t[n++]= (char) (p-code);
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100 if (n==4)
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101 {
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102 base64_decode(&b,t[0],t[1],t[2],t[3],4);
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103 n=0;
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104 }
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105 break;
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106 case '=':
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107 switch (n)
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108 {
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109 case 1: base64_decode(&b,t[0],0,0,0,1); break;
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110 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
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111 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
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112 }
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113 n=0;
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114 break;
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115 case 0:
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116 luaL_pushresult(&b);
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117 return 1;
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118 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
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119 break;
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120 }
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121 }
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122 return 0;
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123 }
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124
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125 static const luaL_Reg Reg_base64[] =
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126 {
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127 { "encode", Lbase64_encode },
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128 { "decode", Lbase64_decode },
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129 { NULL, NULL }
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130 };
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131
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132 /***************** STRINGPREP *****************/
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133
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134 #include <stringprep.h>
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135
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136 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
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137 {
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138 size_t len;
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139 const char *s = luaL_checklstring(L, 1, &len);
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140 char string[1024];
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141 int ret;
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142 if (len >= 1024) {
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143 lua_pushnil(L);
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144 return 1; // TODO return error message
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145 }
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146 strcpy(string, s);
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147 ret = stringprep(string, 1024, 0, profile);
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148 if (ret == STRINGPREP_OK) {
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149 lua_pushstring(L, string);
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150 return 1;
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151 } else {
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152 lua_pushnil(L);
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153 return 1; // TODO return error message
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154 }
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155 }
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156
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157 #define MAKE_PREP_FUNC(myFunc, prep) \
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158 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
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159
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160 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
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161 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
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162 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
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163 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
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164
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165 static const luaL_Reg Reg_stringprep[] =
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166 {
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167 { "nameprep", Lstringprep_nameprep },
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168 { "nodeprep", Lstringprep_nodeprep },
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169 { "resourceprep", Lstringprep_resourceprep },
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170 { "saslprep", Lstringprep_saslprep },
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171 { NULL, NULL }
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172 };
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173
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174 /***************** IDNA *****************/
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175
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176 #include <idna.h>
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177
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178 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
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179 {
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180 size_t len;
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181 const char *s = luaL_checklstring(L, 1, &len);
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182 char* output = NULL;
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183 int ret = idna_to_ascii_8z(s, &output, 0);
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184 if (ret == IDNA_SUCCESS) {
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185 lua_pushstring(L, output);
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186 if (output) free(output);
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187 return 1;
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188 } else {
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189 lua_pushnil(L);
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190 if (output) free(output);
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191 return 1; // TODO return error message
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192 }
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193 }
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194
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195 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
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196 {
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197 size_t len;
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198 const char *s = luaL_checklstring(L, 1, &len);
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199 char* output = NULL;
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200 int ret = idna_to_unicode_8z8z(s, &output, 0);
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201 if (ret == IDNA_SUCCESS) {
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202 lua_pushstring(L, output);
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203 if (output) free(output);
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204 return 1;
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205 } else {
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206 lua_pushnil(L);
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207 if (output) free(output);
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208 return 1; // TODO return error message
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209 }
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210 }
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211
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212 static const luaL_Reg Reg_idna[] =
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213 {
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214 { "to_ascii", Lidna_to_ascii },
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215 { "to_unicode", Lidna_to_unicode },
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216 { NULL, NULL }
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217 };
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218
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219 /***************** end *****************/
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220
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221 static const luaL_Reg Reg[] =
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222 {
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223 { NULL, NULL }
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224 };
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225
432
fb19a5c14d44 Fix for hashes.c and encodings.c to rename luaopen for util_*
Matthew Wild <mwild1@gmail.com>
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226 LUALIB_API int luaopen_util_encodings(lua_State *L)
415
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227 {
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228 luaL_register(L, "encodings", Reg);
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229
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230 lua_pushliteral(L, "base64");
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231 lua_newtable(L);
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232 luaL_register(L, NULL, Reg_base64);
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233 lua_settable(L,-3);
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234
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235 lua_pushliteral(L, "stringprep");
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236 lua_newtable(L);
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237 luaL_register(L, NULL, Reg_stringprep);
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238 lua_settable(L,-3);
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239
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240 lua_pushliteral(L, "idna");
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241 lua_newtable(L);
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242 luaL_register(L, NULL, Reg_idna);
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243 lua_settable(L,-3);
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244
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245 lua_pushliteral(L, "version"); /** version */
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246 lua_pushliteral(L, "-3.14");
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247 lua_settable(L,-3);
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248 return 1;
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249 }