.686
.model flat

extern _MessageBoxW@16 : PROC
extern _ExitProcess@4  : PROC

public _main

.data
tytul dw 't','y','t','u','l',0
utf8_char db 11000100b,10000101b
char_end db ?
utf16_char dw ?
if_long dw 1101100000000000b,1101110000000000b,0
.code

_main PROC

mov ecx,char_end - utf8_char

cmp ecx,1
je byte_1

cmp ecx,2
je byte_2

cmp ecx,3
je byte_3

cmp ecx,4
je byte_4

byte_1:

jmp write

byte_2:

mov ebx,0
mov edx,0
mov dl, utf8_char[0];
shl edx,27
shr edx,21
add ebx,edx

mov edx,0
mov dl,utf8_char[1];
shl edx,26
shr edx,26
add ebx,edx

mov utf16_char,bx
mov utf16_char+2,0

jmp write

byte_3:

jmp write

byte_4:

jmp write

write:

push 0
push offset tytul
push offset utf16_char
push 0

call _MessageBoxW@16

sub esp,16

push 0
call _ExitProcess@4

_main ENDP

END