# HG changeset patch # User Waqas Hussain # Date 1227645925 -18000 # Node ID 3cf7deea99710a0f8746907b53e8ff1b8d800074 # Parent 405d414fbce21fe833c5ad845f7fc957149e6536 Added util-src/encodings.c - support for base64, stringprep and idna encodings diff -r 405d414fbce2 -r 3cf7deea9971 util-src/encodings.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/util-src/encodings.c Wed Nov 26 01:45:25 2008 +0500 @@ -0,0 +1,237 @@ +/* +* xxpath.c +* An implementation of a subset of xpath for Lua 5.1 +* Waqas Hussain +* 05 Oct 2008 15:28:15 +*/ + +#include + +#include "lua.h" +#include "lauxlib.h" + +/*const char* hex_tab = "0123456789abcdef"; +void toHex(const char* in, int length, char* out) { + int i; + for (i = 0; i < length; i++) { + out[i*2] = hex_tab[(in[i] >> 4) & 0xF]; + out[i*2+1] = hex_tab[(in[i]) & 0xF]; + } + //out[i*2] = 0; +}*/ + +/***************** BASE64 *****************/ + +#define uint unsigned int + +static const char code[]= +"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +static void base64_encode(luaL_Buffer *b, uint c1, uint c2, uint c3, int n) +{ + unsigned long tuple=c3+256UL*(c2+256UL*c1); + int i; + char s[4]; + for (i=0; i<4; i++) { + s[3-i] = code[tuple % 64]; + tuple /= 64; + } + for (i=n+1; i<4; i++) s[i]='='; + luaL_addlstring(b,s,4); +} + +static int Lbase64_encode(lua_State *L) /** encode(s) */ +{ + size_t l; + const unsigned char *s=(const unsigned char*)luaL_checklstring(L,1,&l); + luaL_Buffer b; + int n; + luaL_buffinit(L,&b); + for (n=l/3; n--; s+=3) base64_encode(&b,s[0],s[1],s[2],3); + switch (l%3) + { + case 1: base64_encode(&b,s[0],0,0,1); break; + case 2: base64_encode(&b,s[0],s[1],0,2); break; + } + luaL_pushresult(&b); + return 1; +} + +static void base64_decode(luaL_Buffer *b, int c1, int c2, int c3, int c4, int n) +{ + unsigned long tuple=c4+64L*(c3+64L*(c2+64L*c1)); + char s[3]; + switch (--n) + { + case 3: s[2]=tuple; + case 2: s[1]=tuple >> 8; + case 1: s[0]=tuple >> 16; + } + luaL_addlstring(b,s,n); +} + +static int Lbase64_decode(lua_State *L) /** decode(s) */ +{ + size_t l; + const char *s=luaL_checklstring(L,1,&l); + luaL_Buffer b; + int n=0; + char t[4]; + luaL_buffinit(L,&b); + for (;;) + { + int c=*s++; + switch (c) + { + const char *p; + default: + p=strchr(code,c); if (p==NULL) return 0; + t[n++]= p-code; + if (n==4) + { + base64_decode(&b,t[0],t[1],t[2],t[3],4); + n=0; + } + break; + case '=': + switch (n) + { + case 1: base64_decode(&b,t[0],0,0,0,1); break; + case 2: base64_decode(&b,t[0],t[1],0,0,2); break; + case 3: base64_decode(&b,t[0],t[1],t[2],0,3); break; + } + case 0: + luaL_pushresult(&b); + return 1; + case '\n': case '\r': case '\t': case ' ': case '\f': case '\b': + break; + } + } + return 0; +} + +static const luaL_Reg Reg_base64[] = +{ + { "encode", Lbase64_encode }, + { "decode", Lbase64_decode }, + { NULL, NULL } +}; + +/***************** STRINGPREP *****************/ + +#include + +static int stringprep_prep(lua_State *L, const Stringprep_profile *profile) +{ + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + char string[1024]; + int ret; + if (len >= 1024) { + lua_pushnil(L); + return 1; // TODO return error message + } + strcpy(string, s); + ret = stringprep(string, 1024, 0, profile); + if (ret == STRINGPREP_OK) { + lua_pushstring(L, string); + return 1; + } else { + lua_pushnil(L); + return 1; // TODO return error message + } +} + +#define MAKE_PREP_FUNC(myFunc, prep) \ +static int myFunc(lua_State *L) { return stringprep_prep(L, prep); } + +MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep) /** stringprep.nameprep(s) */ +MAKE_PREP_FUNC(Lstringprep_nodeprep, stringprep_xmpp_nodeprep) /** stringprep.nodeprep(s) */ +MAKE_PREP_FUNC(Lstringprep_resourceprep, stringprep_xmpp_resourceprep) /** stringprep.resourceprep(s) */ +MAKE_PREP_FUNC(Lstringprep_saslprep, stringprep_saslprep) /** stringprep.saslprep(s) */ + +static const luaL_Reg Reg_stringprep[] = +{ + { "nameprep", Lstringprep_nameprep }, + { "nodeprep", Lstringprep_nodeprep }, + { "resourceprep", Lstringprep_resourceprep }, + { "saslprep", Lstringprep_saslprep }, + { NULL, NULL } +}; + +/***************** IDNA *****************/ + +#include + +static int Lidna_to_ascii(lua_State *L) /** idna.to_ascii(s) */ +{ + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + char* output = NULL; + int ret = idna_to_ascii_8z(s, &output, 0); + if (ret == IDNA_SUCCESS) { + lua_pushstring(L, output); + if (output) free(output); + return 1; + } else { + lua_pushnil(L); + if (output) free(output); + return 1; // TODO return error message + } +} + +static int Lidna_to_unicode(lua_State *L) /** idna.to_unicode(s) */ +{ + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + char* output = NULL; + int ret = idna_to_unicode_8z8z(s, &output, 0); + if (ret == IDNA_SUCCESS) { + lua_pushstring(L, output); + if (output) free(output); + return 1; + } else { + lua_pushnil(L); + if (output) free(output); + return 1; // TODO return error message + } +} + +static const luaL_Reg Reg_idna[] = +{ + { "to_ascii", Lidna_to_ascii }, + { "to_unicode", Lidna_to_unicode }, + { NULL, NULL } +}; + +/***************** end *****************/ + +static const luaL_Reg Reg[] = +{ + { NULL, NULL } +}; + +LUALIB_API int luaopen_encodings(lua_State *L) +{ + luaL_register(L, "encodings", Reg); + + lua_pushliteral(L, "base64"); + lua_newtable(L); + luaL_register(L, NULL, Reg_base64); + lua_settable(L,-3); + + lua_pushliteral(L, "stringprep"); + lua_newtable(L); + luaL_register(L, NULL, Reg_stringprep); + lua_settable(L,-3); + + lua_pushliteral(L, "idna"); + lua_newtable(L); + luaL_register(L, NULL, Reg_idna); + lua_settable(L,-3); + + lua_pushliteral(L, "version"); /** version */ + lua_pushliteral(L, "-3.14"); + lua_settable(L,-3); + return 1; +}