Base Converter

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Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 27 Sep 2003, 20:21

Hi all!

I newly wrote a base converter in FASM and here it is... Wink

JohnFound: Maybe it could be useful in the Fresh project (as an add-in or something)?

History:
28-09-03: Updated a little bug in the EditCtl-procedure

Enjoy!

Regards,
Tommy

Description:	Base Converter Version 1.0	Download
Filename:	basecnv.asm
Filesize:	6.22 KB
Downloaded:	940 Time(s)

Last edited by Tommy on 28 Sep 2003, 18:52; edited 2 times in total

27 Sep 2003, 20:21

Blag

Joined: 04 Jul 2003
Posts: 90
Location: PerÃº

Blag 28 Sep 2003, 04:01

Great Tommy! Very Happy

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28 Sep 2003, 04:01

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 28 Sep 2003, 09:16

Weird, I got the following error on my win2k

---------------------------
Base Converter: basecnv.exe - Application Error
---------------------------
The instruction at "0x77e189ce" referenced memory at "0x0000002b". The memory could not be "read".

Click on OK to terminate the program
Click on CANCEL to debug the program
---------------------------
OK Cancel
---------------------------

I just find some part of code not to my likes.

28 Sep 2003, 09:16

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 28 Sep 2003, 09:24

What? Hmm...that's strange... Sad

Do you have any idea what the problem is? Confused

28 Sep 2003, 09:24

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 28 Sep 2003, 14:58

I've got a similar problem: it crashes somewhere inside DialogBoxParam..... Sad

(under winME)

28 Sep 2003, 14:58

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 28 Sep 2003, 17:08

...

that's sad...I'll try to figure it out, but want/need some help because I don't use Win2k nor WinME...

28 Sep 2003, 17:08

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 28 Sep 2003, 17:22

I was trying to figure what's wrong, but with no results Sad

..... But I'll keep trying, and will inform you when having any result...

28 Sep 2003, 17:22

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 28 Sep 2003, 18:06

Thanks!

[edit]New update on top... The bug in Win2k and WinME is still not fixed...[/edit]

28 Sep 2003, 18:06

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 29 Sep 2003, 06:04

I was getting bored and was tracing it. Realised that the problem lies in wminitdialog whereby there is an imbalanced stack, resulting in ebx's value not preserved. Grr. did you know that LoadMenu has only 2 parameters and not 3? Stupid bug.

Description:	Corrected code	Download
Filename:	basecnv.asm
Filesize:	6.25 KB
Downloaded:	838 Time(s)

29 Sep 2003, 06:04

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 29 Sep 2003, 06:06

Ah crap, one more crash

---------------------------
Base Converter: basecnv.exe - Application Error
---------------------------
The exception unknown software exception (0xc00000fd) occurred in the application at location 0x004023b6.

Click on OK to terminate the program
Click on CANCEL to debug the program
---------------------------
OK Cancel
---------------------------

29 Sep 2003, 06:06

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 07:35

Oops

stupid me... Thanks for your bug-fix!

The other bug is obviously on line 240 (div ebx).... Confused

But why don't I get any error messages on my computer (not even in OllyDbg)... ?? Confused

Since I don't, it's hard to me to fix the problem....

29 Sep 2003, 07:35

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 07:54

Hmm...I just realized that mine does work without problems on my computer when I fixed the LoadMenu-bug, but not the fixed version from you... Try mine, and see if you get the same problem as you got...

Description:	Base Converter	Download
Filename:	basecnv.asm
Filesize:	6.22 KB
Downloaded:	846 Time(s)

29 Sep 2003, 07:54

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 29 Sep 2003, 08:03

ps some codes can be optimised eg

Code:

       cmp     ebx,2
       setz    al
  neg     al

Code:

cmp ebx, 3
sbb al, al

cmp reg, 0 to test reg,reg or or reg,reg
mov reg, 0 to xor reg,reg or sub reg,reg

PS: That's why I said some parts of the codes I do not like it.

29 Sep 2003, 08:03

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 08:09

Okey... Thanks!!! I'm quite new to assembly and haven't learned too much about optimizing yet... I'll try to learn more about it! Wink

Thanks for your help!!!

Did it work now???

29 Sep 2003, 08:09

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 08:16

Should I optimize:

Code:

mov eax,1    ; 5 bytes

to:

Code:

xor eax,eax  ; 3 bytes
inc eax

???

29 Sep 2003, 08:16

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 29 Sep 2003, 08:22

Tommy wrote:

Should I optimize:

Code:

mov eax,1    ; 5 bytes
to:
xor eax,eax  ; 3 bytes
inc eax

???

Yea, I offen do this. Smile

also:

Code:

    mov  eax, -1
to:
    xor eax,eax
    dec eax

29 Sep 2003, 08:22

HarryTuttle

Joined: 26 Sep 2003
Posts: 211
Location: Poland

HarryTuttle 29 Sep 2003, 08:25

add instead of inc is more efficient,isn't it?

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Last edited by HarryTuttle on 29 Sep 2003, 08:26; edited 1 time in total

29 Sep 2003, 08:25

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 08:26

Hehe... Thanks!

29 Sep 2003, 08:26

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 29 Sep 2003, 09:57

Oh I made a mistake earlier.

Code:

cmp ebx, 3 
sbb al, al

is wrong.

Hehe. Yes add is more efficient but in this context size matters more than speed. For mov reg, -1 , you can try or reg, -1

Oh yes one interesting code that you may want to use for your subclassed edit control is

Code:

;eax = input
lea ecx,[eax-LOWERLIMIT]
cmp ecx,UPPERLIMIT - LOWERLIMIT
jna _inrange

29 Sep 2003, 09:57

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 29 Sep 2003, 10:05

Quote:

Oh I made a mistake earlier.
code:
--------------------------------------------------------------------------------
cmp ebx, 3
sbb al, al
--------------------------------------------------------------------------------
is wrong.

Yes, I found it out myself... Wink

What, actually, does

Code:

;eax = input 
lea ecx,[eax-LOWERLIMIT] 
cmp ecx,UPPERLIMIT - LOWERLIMIT 
jna _inrange

do? Does it check whether the character is in the range [LOWERLIMIT..UPPERLIMIT]?

29 Sep 2003, 10:05

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