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How to compare string with register+offest asm

 
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Twistedfate
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Joined: 11 Mar 2016
Posts: 231
PostPosted: Sun Dec 11, 2016 8:08 am    Post subject: How to compare string with register+offest asm Reply with quote
I need example to compare the string in this offset f48
[ecx+f48] contain string Hello

and I want to compare hello with mystringishere
[ecx+f48],mystringishere
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Zanzer
I post too much
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Joined: 09 Jun 2013
Posts: 3278
PostPosted: Sun Dec 11, 2016 8:19 am    Post subject: Reply with quote
Code:
cmp [ecx+F48],'Hell'
jne code
cmp byte ptr [ecx+F4C],'o'
jne code
//it equals!
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Twistedfate
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Joined: 11 Mar 2016
Posts: 231
PostPosted: Sun Dec 11, 2016 8:28 am    Post subject: Reply with quote
like this for mystringishere word ?
Code:
cmp [ecx+F48],'myst'
jne code
cmp byte ptr [ecx+F4C],'ring'
jne code
cmp [ecx+F48],'ishe'
jne code
cmp byte ptr [ecx+F4C],'re'
jne code
//it equals!
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Zanzer
I post too much
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Joined: 09 Jun 2013
Posts: 3278
PostPosted: Sun Dec 11, 2016 9:02 am    Post subject: This post has 1 review(s) Reply with quote
Nope.
Code:
cmp dword ptr [addr],val // compares 4 bytes (default when size isn't specified)
cmp word ptr [addr],val  // compares 2 bytes
cmp byte ptr [addr],val  // compares 1 byte

The first 4 characters start at [ecx+F48].
Then the next 4 characters start at [ecx+F4C].
Followed by the next 4 characters at [ecx+F50].
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Twistedfate
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Joined: 11 Mar 2016
Posts: 231
PostPosted: Sun Dec 11, 2016 9:26 am    Post subject: Reply with quote
thnx worked ... I cannot rep u untill I rep some one else sorry
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