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Index > Macroinstructions > Need help on converting Masm's union!

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BiMode



Joined: 14 Sep 2007
Posts: 14
Location: Thailand
BiMode
Hello guys,

I'm not good on fasm directives usage and trying to convert an union below which is Masm format.

Code:
IMAGE_SYMBOL STRUCT
    union N
        ShortName db 8 dup(?)
        struct Name1
            Short1 dd       ?
            Long1 dd        ?
        ends
        LongName dd 2 dup(?)
    ends
    Value dd                ?
    SectionNumber dw        ?
    Type1 dw                ?
    StorageClass db         ?
    NumberOfAuxSymbols db   ?
IMAGE_SYMBOL ENDS
    


Here is what my best,

Code:
struct IMAGE_SYMBOL
    N.ShortName             rb 8
    virtual at $-8
        Short               dd ?
        Long                dd ?
    end virtual
    virtual at $-8
        LongName            rd 2
    end virtual
    Value                   dd ?
    SectionNumber           dw ?
    Type                    dw ?
    StorageClass            db ?
    NumberOfAuxSymbols      db ?
ends
    


Any better form would be appriciate...
Post 25 Jan 2009, 15:50
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
You can try this:
Code:
struc IMAGE_SYMBOL {
    virtual
        N.ShortName         rb 8
    end virtual
    virtual
        N.Name1.Short1      dd ?
        N.Name1.Long1       dd ?
    end virtual
    N.LongName              rd 2
    Value                   dd ?
    SectionNumber           dw ?
    Type1                   dw ?
    StorageClass            db ?
    NumberOfAuxSymbols      db ?
}    
Post 25 Jan 2009, 15:54
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BiMode



Joined: 14 Sep 2007
Posts: 14
Location: Thailand
BiMode
Thx, I will try it.
Post 27 Jan 2009, 11:48
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madmatt



Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA
madmatt
you can also use the 'struct' macro, which also has a union macro
Example:

Code:
struct IMAGE_SYMBOL 
    union 
        N.ShortName         rb 8 
    ends 
    union 
        N.Name1.Short1      dd ? 
        N.Name1.Long1       dd ? 
    ends 
    N.LongName              rd 2 
    Value                   dd ? 
    SectionNumber           dw ? 
    Type1                   dw ? 
    StorageClass            db ? 
    NumberOfAuxSymbols      db ? 
ends    
Post 29 Jan 2009, 05:48
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sinsi



Joined: 10 Aug 2007
Posts: 713
Location: Adelaide
sinsi
Unless you're going to access both parts, just make a struc for the one you do use.
Post 29 Jan 2009, 06:16
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
madmatt wrote:
you can also use the 'struct' macro, which also has a union macro
Example:

Code:
struct IMAGE_SYMBOL 
    union 
        N.ShortName         rb 8 
    ends 
    union 
        N.Name1.Short1      dd ? 
        N.Name1.Long1       dd ? 
    ends 
    N.LongName              rd 2 
    Value                   dd ? 
    SectionNumber           dw ? 
    Type1                   dw ? 
    StorageClass            db ? 
    NumberOfAuxSymbols      db ? 
ends    
I don't think that is correct. You need a union of ShortName. {Name1.Short1, Name1.Long1} and LongName. Where {} is a sub-union in the outer union.
Post 29 Jan 2009, 06:20
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