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> Macroinstructions > [solved] generate random data in macros? |
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revolution 12 Jul 2019, 09:21
It depends upon your definition of "random".
You can use %t to get the current time. It isn't really random but might serve for your purpose as a seed value. Otherwise use an external file to grab some random bytes and insert those. If you have Linux then /dev/urandom could suffice. |
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12 Jul 2019, 09:21 |
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Tomasz Grysztar 12 Jul 2019, 09:51
If pseudo-random numbers would be enough for you, my article about types of multi-pass assembly contains some Xorshift macros for fasmg that I used to generate randomized sources. You could make something similar for fasm 1, though you'd have to do it a bit differently to avoid overflows.
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12 Jul 2019, 09:51 |
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edfed 12 Jul 2019, 12:49
Code: macro Random n{ p = ((%t mod n) mod 14) + 1 db n and 0xff db p repeat 14 if % = p db (%t shr n) and 0xff ; here i want to make a random byte else db 0xff end if end repeat } repeat 256 Random % end repeat this code makes what i wanted. thanks  |
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12 Jul 2019, 12:49 |
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edfed 18 Jul 2019, 15:04
this single line makes a good enough random source
Code: RNDT equ ($ + %t) |
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18 Jul 2019, 15:04 |
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revolution 18 Jul 2019, 16:10
 Yeah, sometimes simple is all that is needed. |
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18 Jul 2019, 16:10 |
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