timezone magic number

[Daniel Quinlan]

I have one comment regarding the timezone file format.

Why not use a few of 20 remaining bytes in tzh_reserved field for a
magic number that would be unique to timezone data files?  4 bytes at
the beginning of the file would be great, but if you're concerned
about space then 2 bytes would do the job if selected carefully.

Thanks.

 Dan

--
Daniel Quinlan            Member of the League for Programming Freedom
quinlan at yggdrasil.com