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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obsolete
cache.c
cdf.c	Re-enable DAP2 authorization tests	2021-05-29 21:30:33 -06:00
CMakeLists.txt
common.c
constraints.c
constraints.h
cvt
dapattr.c	Re-enable DAP2 authorization tests	2021-05-29 21:30:33 -06:00
dapcvt.c
dapdebug.c
dapdebug.h
dapdump.c	Support MSYS2/Mingw platform	2021-12-23 22:18:56 -07:00
dapdump.h
dapincludes.h
dapnc.h
dapodom.c
dapodom.h
daputil.c	Fix duplicate BOOL definitions	2021-02-02 22:48:22 -07:00
daputil.h
dce.y	Add filter support to NCZarr	2021-09-02 17:04:26 -06:00
dceconstraints.c	Explicitly disallow variable length type compression	2022-02-19 16:47:31 -07:00
dceconstraints.h
dcelex.c
dceparse.c
dceparselex.h
dcetab.c	Fix various problem around VLEN's	2022-01-08 18:30:00 -07:00
dcetab.h	Fix various problem around VLEN's	2022-01-08 18:30:00 -07:00
env
getvara.c	Fix JSON quoted string processing in libnczarr	2021-05-06 16:39:44 -06:00
getvara.h
main.c
Makefile.am
nccommon.h	Fix duplicate BOOL definitions	2021-02-02 22:48:22 -07:00
ncd2dispatch.c	Enhance/Fix filter support	2022-03-14 12:39:37 -06:00
ncd2dispatch.h
ncdap.c
ncdapa.c
ncdaperr.c
test1.sh
todo
translation.html