It is relatively straight forward to read the tecplot data format. Personally I have not manipulated the connectivity data. However, I have managed to import, export create new data vectors.
The tecplot file format manual has the necessary information:
ftp://ftp.tecplot.com/pub/doc/tecplot/360/dataformat.pdf
However, it will be significantly easier if you have the source code which generates the files.
I am looking for the same thing, have you perhaps found something in the meantime?