prosody
3cf7deea9971
util-src/encodings.c

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util-src/encodings.c @ 415:3cf7deea9971

Added util-src/encodings.c - support for base64, stringprep and idna encodings
author Waqas Hussain <waqas20@gmail.com>
date Wed, 26 Nov 2008 01:45:25 +0500
child 417:d60e63379284
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rev   line source
415
3cf7deea9971 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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parents:
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232
3cf7deea9971 Added util-src/encodings.c - support for base64, stringprep and idna encodings
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parents:
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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 }