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

[Guy Harris <guy@xxxxxxxxxxxx>]

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.