Byte array to Int

[Jackal]

I was wondering how do I convert a byte array to an integer.

for instance 00 00 2B 6F     = 16,375

[redskull]

The easiest way is BSWAP.  However, there are all sorts of various ways using logic, rotating, shifting, and multiplying, and you will more than likely get 100 different responses as the members fight to the death over which is fastest.

-r

[Ghandi]

and you will more than likely get 100 different responses as the members fight to the death over which is fastest.

rofl :D

HR,
Ghandi

[dedndave]

actually, speed for that is only critical if you have to convert thousands of values
usually, these routines are used a few times - go for something small and convenient to use
you can use some of the C lib functions if you want

[Slugsnack]

I was wondering how do I convert a byte array to an integer.

for instance 00 00 2B 6F     = 16,375

i maybe missing something but how is that even a conversion. i'd have thought it might convert to 11119 or 1865089024. where did 16375 come from :|

[dedndave]

...or 0,0,43,111
he did say it was a byte array   :bg
but, you're right, Mike
the answer he probably wants is 1865089024

[Jackal]

...or 0,0,43,111
he did say it was a byte array   :bg
but, you're right, Mike
the answer he probably wants is 1865089024

That answer is wrong. The answer was wrong in my first post also. I got it i think. Its Big Endian and Int32 so my asnwer I needed to get was 11,119.

[qWord]

Its Big Endian and Int32 so my asnwer I needed to get was 11,119.

load the value into an register and use bswap r32 to convert it from network byte order to littel endian. Then yo can use the sdword$(r32/mem32)-macro to convert it to an string (or use directly crt_sprintf-function)

Code Select Expand

mov eax,SDWORD ptr ...
bswap eax
invoke MessageBoxA,0,sdword$(eax),0,0

[jj2007]

bswap eax,eax

That is a cute addition to the x86 instruction set, thanks. I hope bswap eax, [ebx] works, too :green

[qWord]

That is a cute addition to the x86 instruction set, thanks. I hope bswap eax, [ebx] works, too :green

:bg

[Jackal]

all taken care of. Thanks.