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Index > Windows > 17 byte demo! in WinXP
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arcangel



Joined: 19 Aug 2009
Posts: 39
arcangel 03 May 2014, 19:41
I found this little demo

http://board.flatassembler.net/topic.php?t=9147

Code:
use16  
org 0x100  
mov ax,0x13  
int 0x10  
push word 0xA000  
pop es  
paint:  
adc ax, cx  
stosb  
loop paint  
inc ax  
jmp paint


Now I want to run in a window of Windows-XP

Code:
include 'win32ax.inc' ; you can simply switch between win32ax, win32wx, win64ax and win64wx here
org 0x100
mov ax,0x13  
int 0x10  
push word 0xA000  
pop es  
paint:  
adc ax, cx  
stosb  
loop paint  
inc ax  
jmp paint


But it doesn't work in windows-XP ¿Why?

Thanks [/code]
Post 03 May 2014, 19:41
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zhak



Joined: 12 Apr 2005
Posts: 501
Location: Belarus
zhak 03 May 2014, 19:46
this demo writes directly to video memory at address 0xa000:xxxx which is for real mode. it's not valid for 32-bit windows running in protected mode
Post 03 May 2014, 19:46
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arcangel



Joined: 19 Aug 2009
Posts: 39
arcangel 03 May 2014, 20:08
zhak wrote:
this demo writes directly to video memory at address 0xa000:xxxx which is for real mode. it's not valid for 32-bit windows running in protected mode


Will could somehow simulate?

Thank you very much for your help Smile
Post 03 May 2014, 20:08
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20460
Location: In your JS exploiting you and your system
revolution 03 May 2014, 23:30
It is a DOS program that is run under NTVDM in 32-bit Windows. So actually it is run in a VM. You won't be able to simply change it to a 32-bit program by changing the header. You also need substantial changes in the program to use the GDI and work with the OS windowing system.
Post 03 May 2014, 23:30
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r22



Joined: 27 Dec 2004
Posts: 805
r22 05 May 2014, 16:26
This program can be easily ported to windows using JavaScript.

This will run in every modern browser with HTML5 Canvas support.
http://jsfiddle.net/q9y78/

demo.html
Code:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<script type="text/javascript">

/* vga default 256 color palette [r1, g1, b1, ... r256, g256, b256] */
var VGA256 = [0,0,0,0,0,170,0,170,0,0,170,170,170,0,0,170,0,170,170,85,0,170,170,170,85,85,85,85,85,255,85,255,85,85,255,255,255,85,85,255,85,255,255,255,85,255,255,255,0,0,0,16,16,16,32,32,32,53,53,53,69,69,69,85,85,85,101,101,101,117,117,117,138,138,138,154,154,154,170,170,170,186,186,186,202,202,202,223,223,223,239,239,239,255,255,255,0,0,255,65,0,255,130,0,255,190,0,255,255,0,255,255,0,190,255,0,130,255,0,65,255,0,0,255,65,0,255,130,0,255,190,0,255,255,0,190,255,0,130,255,0,65,255,0,0,255,0,0,255,65,0,255,130,0,255,190,0,255,255,0,190,255,0,130,255,0,65,255,130,130,255,158,130,255,190,130,255,223,130,255,255,130,255,255,130,223,255,130,190,255,130,158,255,130,130,255,158,130,255,190,130,255,223,130,255,255,130,223,255,130,190,255,130,158,255,130,130,255,130,130,255,158,130,255,190,130,255,223,130,255,255,130,223,255,130,190,255,130,158,255,186,186,255,202,186,255,223,186,255,239,186,255,255,186,255,255,186,239,255,186,223,255,186,202,255,186,186,255,202,186,255,223,186,255,239,186,255,255,186,239,255,186,223,255,186,202,255,186,186,255,186,186,255,202,186,255,223,186,255,239,186,255,255,186,239,255,186,223,255,186,202,255,0,0,113,28,0,113,57,0,113,85,0,113,113,0,113,113,0,85,113,0,57,113,0,28,113,0,0,113,28,0,113,57,0,113,85,0,113,113,0,85,113,0,57,113,0,28,113,0,0,113,0,0,113,28,0,113,57,0,113,85,0,113,113,0,85,113,0,57,113,0,28,113,57,57,113,69,57,113,85,57,113,97,57,113,113,57,113,113,57,97,113,57,85,113,57,69,113,57,57,113,69,57,113,85,57,113,97,57,113,113,57,97,113,57,85,113,57,69,113,57,57,113,57,57,113,69,57,113,85,57,113,97,57,113,113,57,97,113,57,85,113,57,69,113,81,81,113,89,81,113,97,81,113,105,81,113,113,81,113,113,81,105,113,81,97,113,81,89,113,81,81,113,89,81,113,97,81,113,105,81,113,113,81,105,113,81,97,113,81,89,113,81,81,113,81,81,113,89,81,113,97,81,113,105,81,113,113,81,105,113,81,97,113,81,89,113,0,0,65,16,0,65,32,0,65,49,0,65,65,0,65,65,0,49,65,0,32,65,0,16,65,0,0,65,16,0,65,32,0,65,49,0,65,65,0,49,65,0,32,65,0,16,65,0,0,65,0,0,65,16,0,65,32,0,65,49,0,65,65,0,49,65,0,32,65,0,16,65,32,32,65,40,32,65,49,32,65,57,32,65,65,32,65,65,32,57,65,32,49,65,32,40,65,32,32,65,40,32,65,49,32,65,57,32,65,65,32,57,65,32,49,65,32,40,65,32,32,65,32,32,65,40,32,65,49,32,65,57,32,65,65,32,57,65,32,49,65,32,40,65,45,45,65,49,45,65,53,45,65,61,45,65,65,45,65,65,45,61,65,45,53,65,45,49,65,45,45,65,49,45,65,53,45,65,61,45,65,65,45,61,65,45,53,65,45,49,65,45,45,65,45,45,65,49,45,65,53,45,65,61,45,65,65,45,61,65,45,53,65,45,49,65,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];

var AX = 0;
var CX = 0;
var ES = 0;
var DI = 0;
var CF = 0;
/*
USE16   
ORG 0x100   
MOV AX,0x13   
INT 0x10   
*/
var canvas = document.createElement("canvas");
canvas.style.cssText="position:absolute;top:0;bottom:0;left:0;right:0;width:100%;height:100%;";
canvas.width = 320;
canvas.height = 200;
document.body.appendChild(canvas);
var ctx = canvas.getContext("2d");
/*
AL = ??? mode flag ???
*/
AX = 0x30;
/*
PUSH WORD 0xA000   
POP ES  
*/
ES = ctx.getImageData(0, 0, 320, 200);
/*
LABEL PAINT:
*/
var paint = function paint() {
    do {
        /* ADC AX, CX */
        AX += CX + CF;
        CF = (AX & 0x10000) > 0 ? 1 : 0;
        AX = AX & 0xFFFF;
        /* byte to rgb color */
        var colorIndex = AX & 0xFF,
                r = VGA256[colorIndex * 3],
                g = VGA256[colorIndex * 3 + 1],
                b = VGA256[colorIndex * 3 + 2];
        /* STOSB */
        ES.data[DI * 4] = r;
        ES.data[DI * 4 + 1] = g;
        ES.data[DI * 4 + 2] = b;
        ES.data[DI * 4 + 3] = 255;
        DI = (DI + 1) & 0xFFFF;
        /* LOOP PAINT */
        CX = (CX - 1) & 0xFFFF;
    } while(CX !== 0);
    /* image to screen */
    ctx.putImageData(ES, 0, 0);
    /* INC AX */
    AX = (AX + 1) & 0xFFFF;
    /* LOOP PAINT (delayed) */
    CX = (CX - 1) & 0xFFFF;
    if(CX !== 0) { window.setTimeout(paint, 0); return; }
};
paint();

</script>
</body>
</html>


The only value I fudged was the value of AX after the INT 10h.

*EDIT* http://jsfiddle.net/q9y78/1/ uses the "JMP paint" instead of a second "LOOP paint". Removing the poetic license changes the demo from scrolling to pulsating.
Post 05 May 2014, 16:26
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DOS386



Joined: 08 Dec 2006
Posts: 1905
DOS386 22 May 2014, 09:24
> found this little demo http://board.flatassembler.net/topic.php?t=9147

Bad idea. Should be http://board.flatassembler.net/topic.php?t=9174

> But it doesn't work in windows-XP ¿Why?

Because the 17-Byte version is DOS code, and doesn't run natively in XP (or even 95).

_________________
Bug Nr.: 12345

Title: Hello World program compiles to 100 KB !!!

Status: Closed: NOT a Bug
Post 22 May 2014, 09:24
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