Large executable

Index > Windows > Large executable

Author

Thread

bo

Joined: 19 Mar 2012
Posts: 2

bo 19 Mar 2012, 09:30

Hey, I'm working on some code and my arrays are bloating the exe considerably. Is there a better way?

An example of my current code:

Code:

section '.data' data readable writeable
buf rd 800*600
buf2 rd 512*512
buf3 rd 512*512

19 Mar 2012, 09:30

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20632
Location: In your JS exploiting you and your system

revolution 19 Mar 2012, 09:37

Put all your uninitialised data at the end of the section. Note the different size of the following two:

Code:

section '.data1' data readable writeable
buf rd 800*600
buf2 rd 512*512
buf3 rd 512*512
db 'initialised data here will force all of the above into the exe file'

section '.data2' data readable writeable
db 'initialised data here will allow the below to be removed from the exe file'
buf rd 800*600
buf2 rd 512*512
buf3 rd 512*512

19 Mar 2012, 09:37

bo

Joined: 19 Mar 2012
Posts: 2

bo 19 Mar 2012, 09:57

Thanks for the quick response revolution. It works perfectly. 3 mb condensed to 3 kb!

19 Mar 2012, 09:57

bzdashek

Joined: 15 Feb 2012
Posts: 147
Location: Tolstokvashino, Russia

bzdashek 23 Mar 2012, 13:39

Why don't you allocate memory dynamically?

23 Mar 2012, 13:39

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 23 Mar 2012, 18:15

@bzdashek That works also. Wink

23 Mar 2012, 18:15

majidkamali1370

Joined: 31 Oct 2010
Posts: 50
Location: Iran

majidkamali1370 23 Mar 2012, 19:14

How to allocate memory dynamically?
(I use linux x86)

23 Mar 2012, 19:14

bzdashek

Joined: 15 Feb 2012
Posts: 147
Location: Tolstokvashino, Russia

bzdashek 23 Mar 2012, 19:47

@typdef That's a surprise indeed Wink

@majidkamali1370 here's some information you should probably check (in Linux forum):
http://board.flatassembler.net/topic.php?t=3043

23 Mar 2012, 19:47

Goplat

Joined: 15 Sep 2006
Posts: 181

Goplat 24 Mar 2012, 01:47

bzdashek wrote:

Why don't you allocate memory dynamically?

Since dynamic allocation is more complicated, it should only be used when there's an actual need for it (generally, when the size of some data structure isn't known ahead of time)

24 Mar 2012, 01:47

bzdashek

Joined: 15 Feb 2012
Posts: 147
Location: Tolstokvashino, Russia

bzdashek 24 Mar 2012, 07:50

Goplat wrote:

bzdashek wrote:
Why don't you allocate memory dynamically?
Since dynamic allocation is more complicated, it should only be used when there's an actual need for it (generally, when the size of some data structure isn't known ahead of time)

I'll take a note of that, thank you.

24 Mar 2012, 07:50

badc0de

Joined: 13 Apr 2012
Posts: 15

badc0de 01 May 2012, 09:58

Code:

ada_mo: times 88*88 dd 0

01 May 2012, 09:58

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum