GUID gone from EQUATES/KERNEL32.INC?

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comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 09 Jul 2008, 06:44

Last time I really used them was with FASM 1.52, and a GUID struct was defined in EQUATES/KERNEL32.INC as part of standard include files.

I notice that GUID struct is no longer defined in that file, in FASM 1.67.26.

Just wondering why it was removed.

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comrade (comrade64@live.com; http://comrade.ownz.com/)

09 Jul 2008, 06:44

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 09 Jul 2008, 06:45

I notice the USECOM example uses 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
    \}
 }

Why isn't this part of standard includes? Just wondering too...

09 Jul 2008, 06:45

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 09 Jul 2008, 06:51

comrade wrote:

Why isn't this [GUID] part of standard includes? Just wondering too...

Maybe because there is no error checking done. If the match fails then you get nothing assembled and no warning is given. Better to not include it to avoid potential ugly bugs.

09 Jul 2008, 06:51

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 09 Jul 2008, 16:53

Right, I was going to ask about that too. But I knew someone would get to it.

Can you come up with a single version that assembles an uninitialized GUID if nothing is given, and something if something is given? Or is that impossible?

09 Jul 2008, 16:53

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 09 Jul 2008, 17:00

Try this:

Code:

struc GUID def
 {
   local pending
   match d1-d2-d3-d4-d5, def 
    \{
      label . byte
      .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
      pending equ
    \}
  match =pending,pending
   \{
      . db 16 dup (?)
      if ~ def eq
       display 'Warning: incorrect GUID ',`.,' value, uninitialized value used instead.'
      end if
   \}
 }

09 Jul 2008, 17:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 09 Jul 2008, 17:02

comrade wrote:

Can you come up with a single version that assembles an uninitialized GUID if nothing is given, and something if something is given? Or is that impossible?

Yes, it is quite easy to do. You can assign a label to track if the match succeeded. You can see this happening in the pushd macro.

[edit]Bugger, Tomasz gave the game away. I was going to let comrade think about it for a day or so before posting.[/edit]

09 Jul 2008, 17:02

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 09 Jul 2008, 17:13

You forgot how it used to be here when I was active, didn't you? Wink

09 Jul 2008, 17:13

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 10 Jul 2008, 00:37

Tomasz Grysztar wrote:

You forgot how it used to be here when I was active, didn't you?

Yes, I did. I must have a short memory.

Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for life.

So can you help me with my OS? I've got as far as the for line "format binary", but from there I am stuck. Feel free to post the entire code with working examples and documentation. Thanks

10 Jul 2008, 00:37

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 10 Jul 2008, 06:36

This is all very confusing.

10 Jul 2008, 06:36

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 10 Jul 2008, 06:37

Can you please explain this line:

Quote:

if ~ def eq

If something is not defined but equal to something? What????

10 Jul 2008, 06:37

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 10 Jul 2008, 07:04

That line checks for the macro being called with a non-blank parameter "def". It means: if "def" not-equal-to null.

10 Jul 2008, 07:04

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