Re: tzfile

[RVP <rvp%SDF.ORG@localhost>]

On Wed, 21 Jul 2021, Emmanuel Dreyfus wrote:

> Copying a tzfile from Linux on NetBSD works around the problem in GNUstep,
> and comparing the files, I notice a NetBSD weirdness as shown in
> /usr/share/zoneinfo/Europe/Paris hexdump below:
>
> 00000000  54 5a 69 66 32 00 00 00  00 00 00 00 00 00 00 00  |TZif2...........|
> 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000020  00 00 00 00 00 00 00 01  00 00 00 01 00 00 00 00  |................|
> 00000030  00 00 00 54 5a 69 66 32  00 00 00 00 00 00 00 00  |...TZif2........|
> 00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000050  00 00 00 00 00 00 65 00  00 00 07 00 00 00 1f ff  |......e.........|
>
> Why is the header duplicated with a different content at offset 0x33?

Seems deliberate. From tzfile(5):

Version 2 format

  For version-2-format timezone files, the above header and data are fol-
  lowed by a second header and data, identical in format except that eight
  bytes are used for each transition time or leap second time.


-RVP