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Index > High Level Languages > I compiled dll in VisualStudio 2019 and get 10 kb.

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Roman



Joined: 21 Apr 2012
Posts: 1064
Roman
How i can get small size dll about 2 kb ?
And can i grab only one function from DLL ?


Last edited by Roman on 13 Dec 2020, 12:43; edited 1 time in total
Post 12 Dec 2020, 10:50
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bitRAKE



Joined: 21 Jul 2003
Posts: 3230
Location: vpcmipstrm
bitRAKE
Code:
extern "C" // don't decorate name
__declspec(dllexport)
int
MyAdd(int A, int B) { return A + B; }

bool
__declspec(noinline)
__stdcall
_DllMainCRTStartup(int&, int, int&) { return true; }    
disable security checks "/GS-", /NODEFLIB, etc ...

What do you mean by "grab function from DLL"? The DLL is either loaded or not.

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Post 13 Dec 2020, 09:15
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bitshifter



Joined: 04 Dec 2007
Posts: 786
Location: Massachusetts, USA
bitshifter
you can dynamically load individual library functions at runtime
is that what you meant?

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you just have to keep focused and take it one 'byte' at a time.
Post 13 Dec 2020, 09:32
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ProMiNick



Joined: 24 Mar 2012
Posts: 640
Location: Russian Federation, Sochi
ProMiNick
10 kb for HLL is very nice result if it is not interpretative DotNet program(for DotNet it is catastroficaly large result).
first of all HLL initialization, creating couples(up to 10) of critical sections, RTTI information, there present checking of windows version even if don`t needed, and many many other checks, may be inited internal memory manager even if it not needed...
so 10 kb for HLL is nice. (if it is not .NET exe).
Post 13 Dec 2020, 11:32
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Roman



Joined: 21 Apr 2012
Posts: 1064
Roman
bitRAKE wrote:


What do you mean by "grab function from DLL"? The DLL is either loaded or not.

Like as in IDA pro copy code of concrete function.
But do this in special program.

Cut because i need 3 kb code one function, but not all 13 kb dll !
Post 13 Dec 2020, 12:41
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 18113
Location: In your JS exploiting you and your system
revolution
Oh, so you want to use VS2019 to make some binary code, and then disassemble it and use the code as your own in asm files?

You don't even need to create the DLL. You can ask VS to output just the intermediate assembly text.
Post 13 Dec 2020, 12:44
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