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 #if (LUA_VERSION_NUM == 502)
24 #define luaL_register(L, N, R) luaL_setfuncs(L, R, 0)
27 /***************** BASE64 *****************/
29 static const char code[]=
30 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
32 static void base64_encode(luaL_Buffer *b, unsigned int c1, unsigned int c2, unsigned int c3, int n)
34 unsigned long tuple=c3+256UL*(c2+256UL*c1);
38 s[3-i] = code[tuple % 64];
41 for (i=n+1; i<4; i++) s[i]='=';
42 luaL_addlstring(b,s,4);
45 static int Lbase64_encode(lua_State *L) /** encode(s) */
48 const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l);
52 for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3);
55 case 1: base64_encode(&b,s[0],0,0,1); break;
56 case 2: base64_encode(&b,s[0],s[1],0,2); break;
62 static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n)
64 unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1));
68 case 3: s[2]=(char) tuple;
69 case 2: s[1]=(char) (tuple >> 8);
70 case 1: s[0]=(char) (tuple >> 16);
72 luaL_addlstring(b,s,n);
75 static int Lbase64_decode(lua_State *L) /** decode(s) */
78 const char *s=luaL_checklstring(L,1,&l);
90 p=strchr(code,c); if (p==NULL) return 0;
91 t[n++]= (char) (p-code);
94 base64_decode(&b,t[0],t[1],t[2],t[3],4);
101 case 1: base64_decode(&b,t[0],0,0,0,1); break;
102 case 2: base64_decode(&b,t[0],t[1],0,0,2); break;
103 case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break;
110 case '\n': case '\r': case '\t': case ' ': case '\f': case '\b':
116 static const luaL_Reg Reg_base64[] =
118 { "encode", Lbase64_encode },
119 { "decode", Lbase64_decode },
123 /***************** STRINGPREP *****************/
124 #ifdef USE_STRINGPREP_ICU
126 #include <unicode/usprep.h>
127 #include <unicode/ustring.h>
128 #include <unicode/utrace.h>
130 static int icu_stringprep_prep(lua_State *L, const UStringPrepProfile *profile)
133 int32_t unprepped_len, prepped_len, output_len;
137 UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */
140 UErrorCode err = U_ZERO_ERROR;
142 if(!lua_isstring(L, 1)) {
146 input = lua_tolstring(L, 1, &input_len);
147 if (input_len >= 1024) {
151 u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);
152 if (U_FAILURE(err)) {
156 prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);
157 if (U_FAILURE(err)) {
161 u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);
162 if (U_SUCCESS(err) && output_len < 1024)
163 lua_pushlstring(L, output, output_len);
170 UStringPrepProfile *icu_nameprep;
171 UStringPrepProfile *icu_nodeprep;
172 UStringPrepProfile *icu_resourceprep;
173 UStringPrepProfile *icu_saslprep;
175 /* initialize global ICU stringprep profiles */
178 UErrorCode err = U_ZERO_ERROR;
179 utrace_setLevel(UTRACE_VERBOSE);
180 icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);
181 icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);
182 icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);
183 icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);
184 if (U_FAILURE(err)) fprintf(stderr, "[c] util.encodings: error: %s\n", u_errorName((UErrorCode)err));
187 #define MAKE_PREP_FUNC(myFunc, prep) \
188 static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }
190 MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep) /** stringprep.nameprep(s) */
191 MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep) /** stringprep.nodeprep(s) */
192 MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep) /** stringprep.resourceprep(s) */
193 MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep) /** stringprep.saslprep(s) */
195 static const luaL_Reg Reg_stringprep[] =
197 { "nameprep", Lstringprep_nameprep },
198 { "nodeprep", Lstringprep_nodeprep },
199 { "resourceprep", Lstringprep_resourceprep },
200 { "saslprep", Lstringprep_saslprep },
203 #else /* USE_STRINGPREP_ICU */
205 /****************** libidn ********************/
207 #include <stringprep.h>
209 static int stringprep_prep(lua_State *L, const Stringprep_profile *profile)
215 if(!lua_isstring(L, 1)) {
219 s = lua_tolstring(L, 1, &len);
222 return 1; /* TODO return error message */
225 ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);
226 if (ret == STRINGPREP_OK) {
227 lua_pushstring(L, string);
231 return 1; /* TODO return error message */
235 #define MAKE_PREP_FUNC(myFunc, prep) \
236 static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }
238 MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */
239 MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */
240 MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */
241 MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */
243 static const luaL_Reg Reg_stringprep[] =
245 { "nameprep", Lstringprep_nameprep },
246 { "nodeprep", Lstringprep_nodeprep },
247 { "resourceprep", Lstringprep_resourceprep },
248 { "saslprep", Lstringprep_saslprep },
253 /***************** IDNA *****************/
254 #ifdef USE_STRINGPREP_ICU
255 #include <unicode/ustdio.h>
256 #include <unicode/uidna.h>
257 /* IDNA2003 or IDNA2008 ? ? ? */
258 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
261 int32_t ulen, dest_len, output_len;
262 const char *s = luaL_checklstring(L, 1, &len);
264 UErrorCode err = U_ZERO_ERROR;
268 u_strFromUTF8(ustr, 1024, &ulen, s, len, &err);
269 if (U_FAILURE(err)) {
274 dest_len = uidna_IDNToASCII(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
275 if (U_FAILURE(err)) {
279 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
280 if (U_SUCCESS(err) && output_len < 1024)
281 lua_pushlstring(L, output, output_len);
288 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(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 if (U_FAILURE(err)) {
304 dest_len = uidna_IDNToUnicode(ustr, ulen, dest, 1024, UIDNA_USE_STD3_RULES, NULL, &err);
305 if (U_FAILURE(err)) {
309 u_strToUTF8(output, 1024, &output_len, dest, dest_len, &err);
310 if (U_SUCCESS(err) && output_len < 1024)
311 lua_pushlstring(L, output, output_len);
318 #else /* USE_STRINGPREP_ICU */
319 /****************** libidn ********************/
322 #include <idn-free.h>
324 static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */
327 const char *s = luaL_checklstring(L, 1, &len);
329 int ret = idna_to_ascii_8z(s, &output, IDNA_USE_STD3_ASCII_RULES);
330 if (ret == IDNA_SUCCESS) {
331 lua_pushstring(L, output);
337 return 1; /* TODO return error message */
341 static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */
344 const char *s = luaL_checklstring(L, 1, &len);
346 int ret = idna_to_unicode_8z8z(s, &output, 0);
347 if (ret == IDNA_SUCCESS) {
348 lua_pushstring(L, output);
354 return 1; /* TODO return error message */
359 static const luaL_Reg Reg_idna[] =
361 { "to_ascii", Lidna_to_ascii },
362 { "to_unicode", Lidna_to_unicode },
366 /***************** end *****************/
368 LUALIB_API int luaopen_util_encodings(lua_State *L)
370 #ifdef USE_STRINGPREP_ICU
376 luaL_register(L, NULL, Reg_base64);
377 lua_setfield(L, -2, "base64");
380 luaL_register(L, NULL, Reg_stringprep);
381 lua_setfield(L, -2, "stringprep");
384 luaL_register(L, NULL, Reg_idna);
385 lua_setfield(L, -2, "idna");
387 lua_pushliteral(L, "-3.14");
388 lua_setfield(L, -2, "version");