2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
12 * Lua library for base64, stringprep and idna encodings
15 /* Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way */
16 #define _CRT_SECURE_NO_DEPRECATE
23 /***************** BASE64 *****************/
25 static const char code[]=
26 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
28 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
30 unsigned long tuple=c3+256UL*(c2+256UL*c1);
34 s[3-i] = code[tuple % 64];
37 for (i=n+1; i<4; i++) s[i]='=';
38 luaL_addlstring(b,s,4);
41 static int Lbase64_encode(lua_State *L) /** encode(s) */
44 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
48 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
51 case 1: base64_encode(&b,s[0],0,0,1); break;
52 case 2: base64_encode(&b,s[0],s[1],0,2); break;
58 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
60 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
64 case 3: s[2]=(char) tuple;
65 case 2: s[1]=(char) (tuple >> 8);
66 case 1: s[0]=(char) (tuple >> 16);
68 luaL_addlstring(b,s,n);
71 static int Lbase64_decode(lua_State *L) /** decode(s) */
74 const char *s=luaL_checklstring(L,1,&l);
86 p=strchr(code,c); if (p==NULL) return 0;
87 t[n++]= (char) (p-code);
90 base64_decode(&b,t[0],t[1],t[2],t[3],4);
97 case 1: base64_decode(&b,t[0],0,0,0,1); break;
98 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
99 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
106 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
112 static const luaL_Reg Reg_base64[] =
114 { "encode", Lbase64_encode },
115 { "decode", Lbase64_decode },
119 /***************** STRINGPREP *****************/
120 #ifndef USE_STRINGPREP_ICU
121 /****************** libidn ********************/
123 #include <stringprep.h>
125 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
131 if(!lua_isstring(L, 1)) {
135 s = lua_tolstring(L, 1, &len);
138 return 1; /* TODO return error message */
141 ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
142 if (ret == STRINGPREP_OK) {
143 lua_pushstring(L, string);
147 return 1; /* TODO return error message */
151 #define MAKE_PREP_FUNC(myFunc, prep) \
152 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
154 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
155 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
156 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
157 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
159 static const luaL_Reg Reg_stringprep[] =
161 { "nameprep", Lstringprep_nameprep },
162 { "nodeprep", Lstringprep_nodeprep },
163 { "resourceprep", Lstringprep_resourceprep },
164 { "saslprep", Lstringprep_saslprep },
169 #include <unicode/usprep.h>
170 #include <unicode/ustring.h>
171 #include <unicode/utrace.h>
173 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
176 int32_t unprepped_len, prepped_len, output_len;
180 UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */
183 UErrorCode err = U_ZERO_ERROR;
185 if(!lua_isstring(L, 1)) {
189 input = lua_tolstring(L, 1, &input_len);
190 if (input_len >= 1024) {
194 u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);
195 prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);
196 if (U_FAILURE(err)) {
200 u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);
201 if(output_len < 1024)
202 lua_pushlstring(L, output, output_len);
209 UStringPrepProfile *icu_nameprep;
210 UStringPrepProfile *icu_nodeprep;
211 UStringPrepProfile *icu_resourceprep;
212 UStringPrepProfile *icu_saslprep;
214 /* initialize global ICU stringprep profiles */
217 UErrorCode err = U_ZERO_ERROR;
218 utrace_setLevel(UTRACE_VERBOSE);
219 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
220 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
221 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
222 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
223 if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
226 #define MAKE_PREP_FUNC(myFunc, prep) \
227 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
229 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */
230 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */
231 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */
232 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */
234 static const luaL_Reg Reg_stringprep[] =
236 { "nameprep", Lstringprep_nameprep },
237 { "nodeprep", Lstringprep_nodeprep },
238 { "resourceprep", Lstringprep_resourceprep },
239 { "saslprep", Lstringprep_saslprep },
244 /***************** IDNA *****************/
245 #ifndef USE_STRINGPREP_ICU
246 /****************** libidn ********************/
249 #include <idn-free.h>
251 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
254 const char *s = luaL_checklstring(L, 1, &len);
256 int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
257 if (ret == IDNA_SUCCESS) {
258 lua_pushstring(L, output);
264 return 1; /* TODO return error message */
268 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
271 const char *s = luaL_checklstring(L, 1, &len);
273 int ret = idna_to_unicode_8z8z(s, &output, 0);
274 if (ret == IDNA_SUCCESS) {
275 lua_pushstring(L, output);
281 return 1; /* TODO return error message */
285 #include <unicode/ustdio.h>
286 #include <unicode/uidna.h>
287 /* IDNA2003 or IDNA2008 ? ? ? */
288 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
291 int32_t ulen, dest_len, output_len;
292 const char *s = luaL_checklstring(L, 1, &len);
294 UErrorCode err = U_ZERO_ERROR;
298 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
299 dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
300 if (U_FAILURE(err)) {
304 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
305 if(output_len < 1024)
306 lua_pushlstring(L, output, output_len);
313 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
316 int32_t ulen, dest_len, output_len;
317 const char *s = luaL_checklstring(L, 1, &len);
319 UErrorCode err = U_ZERO_ERROR;
323 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
324 dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
325 if (U_FAILURE(err)) {
329 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
330 if(output_len < 1024)
331 lua_pushlstring(L, output, output_len);
339 static const luaL_Reg Reg_idna[] =
341 { "to_ascii", Lidna_to_ascii },
342 { "to_unicode", Lidna_to_unicode },
346 /***************** end *****************/
348 static const luaL_Reg Reg[] =
353 LUALIB_API int luaopen_util_encodings(lua_State *L)
355 #ifdef USE_STRINGPREP_ICU
358 luaL_register(L, "encodings", Reg);
360 lua_pushliteral(L, "base64");
362 luaL_register(L, NULL, Reg_base64);
365 lua_pushliteral(L, "stringprep");
367 luaL_register(L, NULL, Reg_stringprep);
370 lua_pushliteral(L, "idna");
372 luaL_register(L, NULL, Reg_idna);
375 lua_pushliteral(L, "version"); /** version */
376 lua_pushliteral(L, "-3.14");