Wireshark · Wireshark-dev: Re: [Wireshark-dev] 64bit math

[Erwin Rol <mailinglists@xxxxxxxxxxxx>]

Guy Harris wrote:
> Erwin Rol wrote:
>
>   
> > If i remember right 64bit is a bit problematic due to portability,
> >     
>
> Some 64-bit arithmetic snuck into the code base a while ago, and nobody 
> complained, so we're now allowing it.
>
> Use "gint64" and "guint64" for 64-bit signed and unsigned integral 
> values, respectively.  We have FT_INT64 and FT_UINT64 field types, and 
> routines to fetch 64-bit big-endian and little-endian values.
>
>   
> > so i 
> > have a question, how do i do the following in a "correct" way. For mpeg 
> > transport stream dissecting i need to get a a 42bit value from 48bits,
> >     
>
> Unfortunately, we don't yet have routines to fetch 48-bit big-endian and 
> little-endian values.
>   
I will just fetch them as bytes and shift them manually in a int64, if 
64bit math is not a problem anymore than thats not a big deal. 

- Erwin