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Index > Windows > Section Alignment

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Kain



Joined: 26 Oct 2003
Posts: 108
Kain
Can someone explain section alignment for me? I read two conflicting documents on the subject.

One source says it must be multiples of two, but the FASM docs point out it must be power of two.

I'm no mathematician, but I'm pretty sure these are totally different.

2, 4, 6, 8, ...

vs

1, 4, 9, 16, ...

Or something else?
Post 30 Oct 2004, 03:04
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roticv



Joined: 19 Jun 2003
Posts: 374
Location: Singapore
roticv
Actually it is

2,4,6,8,10, ...
vs
2,4,8,16,32,64,...
Post 30 Oct 2004, 07:35
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Reverend



Joined: 24 Aug 2004
Posts: 408
Location: Poland
Reverend
I am not completely sure, but I think that it is about power of 2. But there is another problem. On win95/98 these values are constant and are equal to 512 for FileAlignment and 4096 for SectionAlignment. Files compiled with other values, won't work on other than NT platforms. So if you want to remain compatible with older versions of windows, you should stay with these values. But we have a small advantage. Because as you know, if we have even only one byte in section, it will pad it with zeroes to these 512 needed by the FileAlignment. But, we can truncate these zeroes if they are in the last section. Such file will work fine on all windowses Smile
Post 30 Oct 2004, 11:13
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
Location: Slovakia
vid
yes, they must be power of two (which are also multiples of two Smile )
Post 01 Nov 2004, 21:50
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Kain



Joined: 26 Oct 2003
Posts: 108
Kain
Thanks for the replies.

My understanding now is that it must be:

2^n

Where n = { 1 .. 13 }
Post 04 Nov 2004, 04:25
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