Читайте также:
|
Виды работ:
- изучить программу на Ассемблере;
- провести анализ структуры программы;
- провести анализ операторов программы;
- ознакомиться с возможным использованием операторов программного кода.
Задание 1. Проанализировать программу, написанную на ассемблере и добавить комментарии к каждой строчке.
format PE GUI 4.0 entry start
include 'win32a.inc' include 'ddraw.inc'
section '.text' code readable executable start:
invoke GetModuleHandleA,NULL mov [hinstance],eax
invoke LoadIconA,NULL,IDI_APPLICATION mov [wc.hIcon],eax
invoke LoadCursorA,NULL,IDC_ARROW mov [wc.hCursor],eax
mov [wc.style],0
mov [wc.lpfnWndProc],WindowProc mov [wc.cbClsExtra],0
mov [wc.cbWndExtra],0 mov eax,[hinstance]
mov [wc.hInstance],eax mov [wc.hbrBackground],0
mov dword [wc.lpszMenuName],NULL mov dword [wc.lpszClassName],_class invoke RegisterClassA,wc
test eax,eax
jz startup_error
invoke CreateWindowExA,\ 0,_class,_title,WS_POPUP+WS_VISIBLE,0,0,0,0,NULL,NULL,[hinstance],NULL
test eax,eax
jz startup_error mov [hwnd],eax
invoke DirectDrawCreate,NULL,DDraw,NULL or eax,eax
jnz ddraw_error
cominvk DDraw,SetCooperativeLevel,\ [hwnd],DDSCL_EXCLUSIVE+DDSCL_FULLSCREEN
or eax,eax
jnz ddraw_error
cominvk DDraw,SetDisplayMode,\ 640,480,8
or eax,eax
jnz ddraw_error
mov [ddsd.dwSize],sizeof.DDSURFACEDESC
mov [ddsd.dwFlags],DDSD_CAPS+DDSD_BACKBUFFERCOUNT mov
[ddsd.ddsCaps.dwCaps],DDSCAPS_PRIMARYSURFACE+DDSCAPS_FLIP+DDSCAPS_CO MPLEX
mov [ddsd.dwBackBufferCount],1 cominvk DDraw,CreateSurface,\
ddsd,DDSPrimary,NULL or eax,eax
jnz ddraw_error
mov [ddscaps.dwCaps],DDSCAPS_BACKBUFFER cominvk DDSPrimary,GetAttachedSurface,\
ddscaps,DDSBack or eax,eax
jnz ddraw_error
mov esi,picture call load_picture jc open_error
mov esi,picture call load_palette
jc open_error
invoke GetTickCount mov [last_tick],eax
jmp paint main_loop:
invoke PeekMessageA,msg,NULL,0,0,PM_NOREMOVE or eax,eax
jz no_message
invoke GetMessageA,msg,NULL,0,0 or eax,eax
jz end_loop
invoke TranslateMessage,msg invoke DispatchMessageA,msg
jmp main_loop no_message:
cmp [active],0
je sleep
cominvk DDSPrimary,IsLost or eax,eax
jz paint
cmp eax,DDERR_SURFACELOST
jne end_loop
cominvk DDSPrimary,Restore paint:
mov [rect.top],0
mov [rect.bottom],480 mov [rect.left],0
mov [rect.right],640
cominvk DDSBack,BltFast,\ 0,0,[DDSPicture],rect,DDBLTFAST_SRCCOLORKEY
or eax,eax
jnz paint_done
movzx eax,[frame] xor edx,edx
mov ebx,10
div ebx
sal eax,6
add eax,480
mov [rect.top],eax
add eax,64
mov [rect.bottom],eax sal edx,6
mov [rect.left],edx add edx,64
mov [rect.right],edx
cominvk DDSBack,BltFast,\ [x],[y],[DDSPicture],rect,DDBLTFAST_SRCCOLORKEY
cominvk DDSPrimary,SetPalette,[DDPalette] cominvk DDSPrimary,Flip,0,0
paint_done:
invoke GetTickCount mov ebx,eax
sub ebx,[last_tick] cmp ebx,20
jb main_loop add [last_tick],20
inc [frame] cmp [frame],60 jb main_loop mov [frame],0 jmp main_loop
sleep:
invoke WaitMessage jmp main_loop
ddraw_error:
mov eax,_ddraw_error jmp error
open_error:
mov eax,_open_error error:
invoke MessageBoxA,[hwnd],eax,_error,MB_OK+MB_ICONERROR invoke DestroyWindow,[hwnd]
invoke PostQuitMessage,1 jmp main_loop
startup_error:
invoke MessageBoxA,[hwnd],_startup_error,_error,MB_OK+MB_ICONERROR end_loop:
invoke ExitProcess,[msg.wParam] include 'gif87a.inc'
proc WindowProc hwnd,wmsg,wparam,lparam push ebx esi edi
mov eax,[wmsg]
cmp eax,WM_CREATE je.wmcreate
cmp eax,WM_DESTROY je.wmdestroy
cmp eax,WM_ACTIVATE je.wmactivate
cmp eax,WM_SETCURSOR je.wmsetcursor
cmp eax,WM_MOUSEMOVE je.wmmousemove
cmp eax,WM_KEYDOWN je.wmkeydown
.defwindowproc:
invoke DefWindowProcA,[hwnd],[wmsg],[wparam],[lparam] jmp.finish
.wmcreate:
xor eax,eax
jmp.finish
.wmkeydown:
cmp [wparam],VK_ESCAPE jne.finish
.wmdestroy:
cominvk DDraw,RestoreDisplayMode cominvk DDraw,Release
invoke PostQuitMessage,0 xor eax,eax
jmp.finish
.wmactivate:
mov eax,[wparam] mov [active],al jmp.finish
.wmsetcursor:
invoke SetCursor,0 xor eax,eax
jmp.finish
.wmmousemove:
movsx eax,word [lparam] mov [x],eax
movsx eax,word [lparam+2] mov [y],eax
.finish:
pop edi esi ebx ret
endp
section '.data' data readable writeable
_title db 'flat assembler DirectDraw application',0
_class db 'FDDRAW32',0
_error db 'Error',0
_startup_error db 'Startup failed.',0
_ddraw_error db 'Direct Draw initialization failed.',0
_open_error db 'Failed opening data file.',0 picture db 'DDRAW.GIF',0
section '.bss' readable writeable
hinstance dd? hwnd dd?
wc WNDCLASS
msg MSG
ddsd DDSURFACEDESC
ddscaps DDSCAPS
DDraw DirectDraw DDSPrimary DirectDrawSurface DDSBack DirectDrawSurface
DDSPicture DirectDrawSurface DDPalette DirectDrawPalette
bytes_count dd? last_tick dd? frame db? active db?
LZW_bits db?
LZW_table rd (0F00h-2)*2 buffer rb 40000h
rect RECT x dd?
y dd?
section '.idata' import data readable library kernel,'KERNEL32.DLL',\
user,'USER32.DLL',\ ddraw,'DDRAW.DLL'
import kernel,\ GetModuleHandleA,'GetModuleHandleA',\ CreateFileA,'CreateFileA',\ ReadFile,'ReadFile',\ CloseHandle,'CloseHandle',\ GetTickCount,'GetTickCount',\ ExitProcess,'ExitProcess'
import user,\
RegisterClassA,'RegisterClassA',\ CreateWindowExA,'CreateWindowExA',\ DestroyWindow,'DestroyWindow',\
DefWindowProcA,'DefWindowProcA',\ GetMessageA,'GetMessageA',\ PeekMessageA,'PeekMessageA',\ TranslateMessage,'TranslateMessage',\ DispatchMessageA,'DispatchMessageA',\ LoadCursorA,'LoadCursorA',\ LoadIconA,'LoadIconA',\ SetCursor,'SetCursor',\ MessageBoxA,'MessageBoxA',\ PostQuitMessage,'PostQuitMessage',\ WaitMessage,'WaitMessage'
import ddraw,\ DirectDrawCreate,'DirectDrawCreate'
Задание 2. Оформить отчет.
Дата добавления: 2015-04-12; просмотров: 99 | Поможем написать вашу работу | Нарушение авторских прав |