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Camera temperature from makernote

I got some more information on this through the Exiftool documentation, as Exiv2 does not yet support this parameter (under discussion with the Exiv2's author). ideally I would like to avoid using Perl-based Exiftool.

Going first here: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/index.html (with explanation on how to decypher what follows)
and clicking on Canon, you end up with the tag list, with adresses written in hex.
Then at 0x0004, clicking on “Canon ShotInfo Tags” brings you down to a so called 2-byte-offseted “index2” at number 12 (and I have no idea what that means), where you’ll find the little bugger “CameraTemperature”.

With this information, I have to find out how to read that out either from the raw file, getting my hands dirty, or through the Exiv2 API, if it allows it knowing the exact locations in the makernote...
Feel free to advise, although i understand this not Libraw's concern.