Decode HxRLE data stream
    
    If C-extension is not compiled it will use a (slower) Python equivalent
    
    :param int output_size: the number of items when ``data`` is uncompressed
    :param str data: a raw stream of data to be unpacked
    :return numpy.array output: an array of ``numpy.uint8``

def hxbyterle_decode(output_size, data):
    """Decode HxRLE data stream
    
    If C-extension is not compiled it will use a (slower) Python equivalent
    
    :param int output_size: the number of items when ``data`` is uncompressed
    :param str data: a raw stream of data to be unpacked
    :return numpy.array output: an array of ``numpy.uint8``
    """
    output = byterle_decoder(data, output_size)
    assert len(output) == output_size     
    return output