[tz] Decoding timezone data
abbotti at mev.co.uk
Tue Nov 8 12:14:15 UTC 2011
On 2011-11-08 11:45, Zefram wrote:
> Ian Abbott wrote:
>> As an other aside, is there a better way to describe the in-file layout
>> of the ttinfo array members than using a C struct?
> Exactly what follows the struct code:
> Each structure is written as a four-byte value for tt_gmtoff
> of type long, in a standard byte order, followed by a one-
> byte value for tt_isdst and a one-byte value for tt_abbrind.
> In file format terminology, that would be:
> Each ttinfo structure consists of a four-byte big-endian signed
> integer tt_gmtoff, a one-byte signed integer tt_isdst, and a one-byte
> unsigned integer tt_abbrind.
Once it has been established in the introductory matter that all
integers are in big-endian order, there would be no need to specify that
for individual fields. The introductory matter should also specify that
signed integers are stored in 2's complement format.
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti at mev.co.uk> )=-
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