add utf8.encode

src/logic/scripting/lua/libs/libutf8.cpp

@@ -0,0 +1,28 @@
+#include "api_lua.hpp"
+
+#include <vector>
+
+#include "../lua_custom_types.hpp"
+#include "util/stringutil.hpp"
+
+int l_encode(lua::State* L) {
+    std::string string = lua::require_string(L, 1);
+    if (lua::toboolean(L, 2)) {
+        lua::createtable(L, string.length(), 0);
+        for (size_t i = 0; i < string.length(); i++) {
+            lua::pushinteger(L, string[i]);
+            lua::rawseti(L, i+1);
+        }
+    } else {
+        lua::newuserdata<lua::LuaBytearray>(L, string.length());
+        auto bytearray = lua::touserdata<lua::LuaBytearray>(L, -1);   
+        bytearray->data().reserve(string.length());
+        std::memcpy(bytearray->data().data(), string.data(), string.length());
+    }
+    return 1;
+}
+
+const luaL_Reg utf8lib[] = {
+    {"encode", lua::wrap<l_encode>},
+    {NULL, NULL}
+};