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Index > Macroinstructions > how to define and initialize struc for GUID

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zhak



Joined: 12 Apr 2005
Posts: 490
Location: Belarus
zhak
I've been struggling with struc all the evening, but cannot make it work

I'd like to define a struc for GUID as follows:
Code:
struc GUID {
  .TimeLow dd ?
  .TimeMid dw ?
  .TimeHighAndVersion dw ?
  .ClockSeqHighAndReserved db ?
  .ClockSeqLow db ?
  .Node db 6 dup (?)
}    

the problem is that the structure is not initializable.
For example, I want to init the structure with values
Code:
MyGUID GUID 0x12345678, 0x1234, 0x5678, 0xaa, 0xbb, <0x11, 0x11, 0x11, 0x11, 0x11, 0x11>    

or I'd like to define several constants in a .inc file so I could use them like
MyGUID GUID CONSTANT_VAL

The only solution I came up with is to use
Code:
struc GUID [val] {
  align 8
 common
  . db val
}    

and initialize GUID byte by byte. But this is not the way I'd like it to be.
Thanks in advance for any suggestions.
Post 04 May 2014, 22:21
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17350
Location: In your JS exploiting you and your system
revolution
In the USECOM example there is this:
Code:
struc GUID def
 {
   match d1-d2-d3-d4-d5, def
    \{
      .Data1 dd 0x\#d1
      .Data2 dw 0x\#d2
      .Data3 dw 0x\#d3
      .Data4 db 0x\#d4 shr 8,0x\#d4 and 0FFh
      .Data5 db 0x\#d5 shr 40,0x\#d5 shr 32 and 0FFh,0x\#d5 shr 24 and 0FFh,0x\#d5 shr 16 and 0FFh,0x\#d5 shr 8 and 0FFh,0x\#d5 and 0FFh
    \}
 }    
Post 04 May 2014, 23:02
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