[Kst] NASA's cdf datasource

[Nicolas.Brisset at eurocopter.com]

Hi,

I've been trying to add a datasource for NASA's cdf file format 
(http://nssdc.gsfc.nasa.gov/cdf/cdf_home.html) which we happen to work with. 
It is an extremely compact, open and flexible (binary) format, delivered with 
an Open Source library and tools.

I have succeeded in:
- creating the datasource directory in the kst distribution (actually a CVS 
snapshot) and getting it to compile (not that easy with auto* tools !)
- retrieving the list of variable names
- reading the data values

Well, that sounds rather good, doesn't it ? The only _small_ problem is that 
kst crashes while reading the values (the second time !). I do not understand 
exactly what is wrong and why all values for a given variable are read more 
than once, so I thought one of you might help :-) 

Attached are the following:
1) cdf.cpp implementation
2) cdf.h corresponding header
3) .desktop file
4) Makefile.am file with the important line:
kstdata_cdf_la_LIBADD= $(CDF_LIBS) which makes it link the cdf library 
(libcdf.so)
5) a sample cdf file to experiment with.

Thanks for all the work on kst, and feel free to make the cdf datasource 
work :-)

Nicolas

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