Support for RLE, HUFF and AHUFF compression?

[ericthewizard]

I saw the issue for this (#3) was closed - were these ever added? I'm particularly interested in variable level compression (reading and writing) for these types, and if they are supported, how to find out which one is being used.

For example, when opening a CDF with a variable that uses RLE compression:

>>> import cdflib
>>> c = cdflib.CDF("rle.cdf")
>>> vdr = c.vdr_info("rle")
>>> vdr
VDR(data_type=21, section_type=8, next_vdr_location=0, variable_number=1, head_vxr=0, last_vxr=0, max_rec=-1, name='rle', num_dims=0, dim_sizes=[], compression_bool=True, compression_level=0, blocking_factor=0, dim_vary=[], record_vary=True, num_elements=1, sparse=0, pad=array([-1.e+30], dtype=float32))

compression_bool is set to True, but there doesn't seem to be any way to determine that it's RLE.