EXIF and Makernote data

[dazandbec]

Hi,

am having trouble extracting the Makernote contained in the EXIF data
in a JPEG image from a digital camera. I am able to successfully
extract the data contained in the makernote tag, however I cannot
decode the data (ie, get the long focal length, short focal length,
etc). I have seen the makernote information for different camera makes,
such as Canon and Nikon (eg. http://www.burren.cx/david/canon.html),
but I cannot seem to work out how to match up the tag name and offset
value to the data I extract from the EXIF data. Hopefully this makes
sense :-)

Is anybody able to help me with this, ie provide any code samples or
even pseudo code? Thanks in advance.

Cheers