Defining entries of partial data size in structures

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 31 Oct 2016, 23:44

If a C header defines a structure as

Code:

struct MY {
    UINT32 Length:24;
    UINT32 Type:8;
}

meaning the upper three bytes of DWORD are Length, and the low byte of a DWORD is type, how would you implement such struct in fasm?

I thought it could be

Code:

struct MY
    Length rb 3
    Type rb 1
ends

Or maybe there's a more elegant way?

31 Oct 2016, 23:44

revolution
When all else fails, read the source

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

revolution 31 Oct 2016, 23:55

I don't know what you consider "elegant". You might also want to place a dword covering alias:

Code:

struct MY
        union
                value rd 1
                struct
                        Length rb 3
                        Type rb 1
                ends
        ends
ends

31 Oct 2016, 23:55

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