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/*
* encodings.c
* Lua library for base64, stringprep and idna encodings
*/
// Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way
#define _CRT_SECURE_NO_DEPRECATE
#include <string.h>
#include <stdlib.h>
#include "lua.h"
#include "lauxlib.h"
/***************** 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]=(char) tuple;
case 2: s[1]=(char) (tuple >> 8);
case 1: s[0]=(char) (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++]= (char) (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 <stringprep.h>
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 <idna.h>
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_util_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;
}
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