Need help on converting Masm's union!

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BiMode

Joined: 14 Sep 2007
Posts: 14
Location: Thailand

BiMode 25 Jan 2009, 15:50

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...

25 Jan 2009, 15:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 25 Jan 2009, 15:54

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 ?
}

25 Jan 2009, 15:54

BiMode

Joined: 14 Sep 2007
Posts: 14
Location: Thailand

BiMode 27 Jan 2009, 11:48

Thx, I will try it.

27 Jan 2009, 11:48

madmatt

Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA

madmatt 29 Jan 2009, 05:48

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

29 Jan 2009, 05:48

sinsi

Joined: 10 Aug 2007
Posts: 794
Location: Adelaide

sinsi 29 Jan 2009, 06:16

Unless you're going to access both parts, just make a struc for the one you do use.

29 Jan 2009, 06:16

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 29 Jan 2009, 06:20

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.

29 Jan 2009, 06:20

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