Rewrite from C++ to FASM

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Snejk47

Joined: 04 Aug 2011
Posts: 2

Snejk47 04 Aug 2011, 14:47

Hi all, I'm new here Smile

I have C++ source file (SDK header) and i wanna convert it to FASM.
C++ file and what i now have done. I wanna rewrite all but i don't know how to convert for example this:

Code:

struct TPluginInfo
{
     int cbSize;
 wchar_t* ShortName;
 int Version;
        wchar_t* Description;
       wchar_t* Author;
    wchar_t* AuthorMail;
        wchar_t* Copyright;
 wchar_t* Homepage;
  char Flag;      
    int ReplaceDefaultModule;
};

How can I check what I have to insert instead of an "int" or "unsigned int" or "wchar_t *"?

Snejk.

04 Aug 2011, 14:47

edfed

Joined: 20 Feb 2006
Posts: 4301
Location: Now

edfed 04 Aug 2011, 15:54

only char flag is a byte value inside the struct

all others, like wchar_t* ShortName are just pointers to char strings containing the name in ascii.

i note that you omited to end the file names by a 0 bytes.
you should end all individual file names with a null char other wize, you will have problems to exploit them.

int can be 16 or 32 bits
depend on the application you want to do.

04 Aug 2011, 15:54

AsmGuru62

Joined: 28 Jan 2004
Posts: 1509
Location: Toronto, Canada

AsmGuru62 04 Aug 2011, 17:22

Also, different structure packing options in C++ may cause a misalignment of last field in a structure in FASM.

04 Aug 2011, 17:22

addes3

Joined: 09 May 2011
Posts: 29

addes3 04 Aug 2011, 22:08

You should change the DB's to EQU's.

And the L"" are wide (unicode) strings, so just wrapping them in single quotes may not work.

04 Aug 2011, 22:08

rain_storm

Joined: 05 Apr 2007
Posts: 67
Location: Ireland

rain_storm 06 Aug 2011, 02:28

The FASM equivelent would look something like this

Code:

struct TPluginInfo
    cbSize               dd ?
    ShortName            dd ?
    Version              dd ?
    Description          dd ?
    Author               dd ?
    AuthorMail           dd ?
    Copyright            dd ?
    Homepage             dd ?
    Flag                 dd ? ; assumes that char is padded to dword alignment
    ReplaceDefaultModule dd ? 
ends

06 Aug 2011, 02:28

addes3

Joined: 09 May 2011
Posts: 29

addes3 12 Aug 2011, 20:45

Look here: http://board.flatassembler.net/topic.php?t=5150

12 Aug 2011, 20:45

Overflowz

Joined: 03 Sep 2010
Posts: 1046

Overflowz 12 Aug 2011, 23:02

rain_storm
maybe this would be better ?

Code:

struct TPluginInfo 
    .cbSize               dd ? 
    .ShortName            dd ? 
    .Version              dd ? 
    .Description          dd ? 
    .Author               dd ? 
    .AuthorMail           dd ? 
    .Copyright            dd ? 
    .Homepage             dd ? 
    .Flag                 dd ? ; assumes that char is padded to dword alignment 
    .ReplaceDefaultModule dd ?  
ends

12 Aug 2011, 23:02

Snejk47

Joined: 04 Aug 2011
Posts: 2

Snejk47 13 Aug 2011, 16:04

Thank you very much for all Wink

13 Aug 2011, 16:04

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