trying to make this with macros

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DC740

Joined: 01 Oct 2004
Posts: 74
Location: Argentina

DC740 12 Apr 2006, 01:59

hello, I'm trying to do a port from a C source code, and I want to translate this:

#define crc32(c, b) (crc_32_tab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8 ))

to FASM macros, has anybody already done this?? is this posible using macros or I should make it with code???

thanx for your time

(I used the search function in the forum and I didn't find any interesting topics about this, of course maybe I'm wrong)

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12 Apr 2006, 01:59

Madis731

Joined: 25 Sep 2003
Posts: 2139
Location: Estonia

Madis731 12 Apr 2006, 06:38

How about:
http://board.flatassembler.net/topic.php?t=2568

This can be done both with macros and in the code - depending on what you want.

12 Apr 2006, 06:38

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 12 Apr 2006, 07:39

next time more descriptive thread name please

12 Apr 2006, 07:39

RedGhost

Joined: 18 May 2005
Posts: 443
Location: BC, Canada

RedGhost 13 Apr 2006, 08:13

Code:

;out:
;    eax = result
macro crc32 c, b {
    mov eax, c
    xor eax, b
    and eax, $0FF
    mov eax, dword[crc_32_tab+eax*4]
    mov ebx, c
    shr ebx, 8
    xor eax, ebx
}   
;---

it's very late so my conversion may be wrong, and i have not tested in fasm but i'm sure it will compile fine as long as crc_32_tab is defined

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redghost.ca

13 Apr 2006, 08:13

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