Binary file grammar

[wobbles via Digitalmars-d]

On Monday, 10 August 2015 at 12:38:11 UTC, ketmar wrote:
> it looks like you can use some serialization library instead, 
> like Orange. structs that those library takes as input can be 
> seen as a kind of grammar description. ;-)

Trouble with that is what if there's some funny formats some data 
is in? Like I described above a string which starts with a number 
and continues for that number of bytes.
What if it's a string that goes on until you hit a '\0' ? A 
serialisation library like Orange couldnt do that, as it's merely 
for (de)serialising D objects, I think?