flat assembler - patcher

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kourin

Joined: 04 Oct 2012
Posts: 4

kourin 04 Oct 2012, 21:19

Hello,

I just made a program to generate a patcher executable on Win32. I suppose it's not very original but I needed one and wanted to practice fasm so I made one myself. Yet, it's more convenient and powerfull than most patchers I saw, since you can write a patch like this:

Code:

include 'patcher.inc'
file "patchme.exe"
  at 0x100
    db 0x25, 3, 12
    db "hello world!", 0
    dd 0x12345678
    dw -1, 0x2289
  at 23
    mov eax, ecx
    push ecx
    jmp short 5
  at 0x453
    db 15
file "..\metoo.dll"
  at 1387
    dw 1
done

As you can see, several files are patched, at several positions, and you can write code as well as data. For a single file, single position patch, you can use the alternative syntax:

Code:

include 'patcher.inc'
patch "filename", offset, byte_1, byte_2..., byte_n

The zip file contains 'patcher.inc' and a 'readme.txt' providing syntax and examples. Have fun! Comments are welcome, regarding the program's functionnality or the code itself. =)

k.

Description:	generate a powerfull patcher in no time	Download
Filename:	patcher.zip
Filesize:	2.57 KB
Downloaded:	312 Time(s)

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04 Oct 2012, 21:19

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hopcode

Joined: 04 Mar 2008
Posts: 563
Location: Germany

hopcode 05 Oct 2012, 18:09

kourin wrote:

Hello,

Code:

include 'patcher.inc'
file "patchme.exe"
  at 0x100
    db 0x25, 3, 12
    db "hello world!", 0
    dd 0x12345678
    dw -1, 0x2289
  at 23
    mov eax, ecx
    push ecx
    jmp short 5
  at 0x453
    db 15
file "..\metoo.dll"
  at 1387
    dw 1
done

k.

hi kourin, i find it cool, especially because this snippet tells, to those who understand and all the list of bugreporters together with those who understand, 2 main things:
1) such quirkiness featured from space:address at 1.71.com syntax are perfectly avoidable
2) the fact that you needed to strenghten the AT using a macro... instead of using the quirkiness that apart for the LOAD directive has no other usefulness

thanks for sharing,
Cheers

btw: please, no flaming intention eehh!!! Laughing

Laughing

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05 Oct 2012, 18:09

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