Obtaining HDF5 compression information

[mkitti]

I noticed the following comment:

Always returns {@link CompressionType}#RAW because I could not yet find a meaningful way to get information about the compression of a dataset.

To obtain compression information, we need to perform the following steps:

1. Obtain Dataset Creation Property List (DCPL) from the dataset

   • C: https://portal.hdfgroup.org/display/HDF5/H5D_GET_CREATE_PLIST

   • Java: https://bitbucket.hdfgroup.org/pages/HDFFV/hdf5doc/master/browse/html/javadoc/hdf/hdf5lib/H5.html#H5Dget_create_plist-long-

2. Query the DCPL for the number of filters

   • C: https://portal.hdfgroup.org/display/HDF5/H5P_GET_NFILTERS

   • Java: https://bitbucket.hdfgroup.org/pages/HDFFV/hdf5doc/master/browse/html/javadoc/hdf/hdf5lib/H5.html#H5Pget_nfilters-long-

3. Query the DCPL for each filter by iterating over the filter index

   • C: https://portal.hdfgroup.org/display/HDF5/H5P_GET_FILTER

   • Java: https://bitbucket.hdfgroup.org/pages/HDFFV/hdf5doc/master/browse/html/javadoc/hdf/hdf5lib/H5.html#H5Pget_filter-long-int-int:A-long:A-int:A-long-java.lang.String:A-int:A-

4. Alternatively, query the DCPL for known compression filters

   • C: https://portal.hdfgroup.org/display/HDF5/H5P_GET_FILTER_BY_ID

   • Java: https://bitbucket.hdfgroup.org/pages/HDFFV/hdf5doc/master/browse/html/javadoc/hdf/hdf5lib/H5.html#H5Pget_filter_by_id2-long-long-int:A-long:A-int:A-long-java.lang.String:A-int:A-

With JHDF5 19.04, it should be easier to access this API. However, we may need to perform the HDF5 access hack as in bigdataviewer-core:
https://github.com/bigdataviewer/bigdataviewer-core/blob/master/src/main/java/bdv/export/HDF5AccessHack.java