netcdf-c/libnetcdf.settings.in
Dennis Heimbigner 3ffe7be446 Enhance/Fix filter support
re: Discussion https://github.com/Unidata/netcdf-c/discussions/2214

The primary change is to support so-called "standard filters".
A standard filter is one that is defined by the following
netcdf-c API:
````
int nc_def_var_XXX(int ncid, int varid, size_t nparams, unsigned* params);
int nc_inq_var_XXXX(int ncid, int varid, int* usefilterp, unsigned* params);
````
So for example, zstandard would be a standard filter by defining
the functions *nc_def_var_zstandard* and *nc_inq_var_zstandard*.

In order to define these functions, we need a new dispatch function:
````
int nc_inq_filter_avail(int ncid, unsigned filterid);
````
This function, combined with the existing filter API can be used
to implement arbitrary standard filters using a simple code pattern.
Note that I would have preferred that this function return a list
of all available filters, but HDF5 does not support that functionality.

So this PR implements the dispatch function and implements
the following standard functions:
    + bzip2
    + zstandard
    + blosc
Specific test cases are also provided for HDF5 and NCZarr.
Over time, other specific standard filters will be defined.

## Primary Changes
* Add nc_inq_filter_avail() to netcdf-c API.
* Add standard filter implementations to test use of *nc_inq_filter_avail*.
* Bump the dispatch table version number and add to all the relevant
   dispatch tables (libsrc, libsrcp, etc).
* Create a program to invoke nc_inq_filter_avail so that it is accessible
  to shell scripts.
* Cleanup szip support to properly support szip
  when HDF5 is disabled. This involves detecting
  libsz separately from testing if HDF5 supports szip.
* Integrate shuffle and fletcher32 into the existing
  filter API. This means that, for example, nc_def_var_fletcher32
  is now a wrapper around nc_def_var_filter.
* Extend the Codec defaulting to allow multiple default shared libraries.

## Misc. Changes
* Modify configure.ac/CMakeLists.txt to look for the relevant
  libraries implementing standard filters.
* Modify libnetcdf.settings to list available standard filters
  (including deflate and szip).
* Add CMake test modules to locate libbz2 and libzstd.
* Cleanup the HDF5 memory manager function use in the plugins.
* remove unused file include//ncfilter.h
* remove tests for the HDF5 memory operations e.g. H5allocate_memory.
* Add flag to ncdump to force use of _Filter instead of _Deflate
  or _Shuffle or _Fletcher32. Used for testing.
2022-03-14 12:39:37 -06:00

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# NetCDF C Configuration Summary
==============================
# General
-------
NetCDF Version: @PACKAGE_VERSION@
Dispatch Version: @NC_DISPATCH_VERSION@
Configured On: @CONFIG_DATE@
Host System: @host_cpu@-@host_vendor@-@host_os@
Build Directory: @abs_top_builddir@
Install Prefix: @prefix@
# Compiling Options
-----------------
C Compiler: @CC_VERSION@
CFLAGS: @CFLAGS@
CPPFLAGS: @CPPFLAGS@
LDFLAGS: @LDFLAGS@
AM_CFLAGS: @AM_CFLAGS@
AM_CPPFLAGS: @AM_CPPFLAGS@
AM_LDFLAGS: @AM_LDFLAGS@
Shared Library: @enable_shared@
Static Library: @enable_static@
Extra libraries: @LIBS@
XML Parser: @XMLPARSER@
# Features
--------
NetCDF-2 API: @HAS_NC2@
HDF4 Support: @HAS_HDF4@
HDF5 Support: @HAS_HDF5@
NetCDF-4 API: @HAS_NC4@
NC-4 Parallel Support: @HAS_PARALLEL4@
PnetCDF Support: @HAS_PNETCDF@
DAP2 Support: @HAS_DAP2@
DAP4 Support: @HAS_DAP4@
Byte-Range Support: @HAS_BYTERANGE@
Diskless Support: @HAS_DISKLESS@
MMap Support: @HAS_MMAP@
JNA Support: @HAS_JNA@
CDF5 Support: @HAS_CDF5@
ERANGE Fill Support: @HAS_ERANGE_FILL@
Relaxed Boundary Check: @RELAX_COORD_BOUND@
Parallel Filters: @HAS_PAR_FILTERS@
NCZarr Support: @HAS_NCZARR@
Multi-Filter Support: @HAS_MULTIFILTERS@
Quantization: @HAS_QUANTIZE@
Logging: @HAS_LOGGING@
SZIP Write Support: @HAS_SZLIB_WRITE@
Standard Filters: @STD_FILTERS@