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3ffe7be446
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.
323 lines
7.0 KiB
C
323 lines
7.0 KiB
C
/* Copyright 2005-2018 University Corporation for Atmospheric
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Research/Unidata. */
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/**
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* @file
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* @internal This header file contains prototypes and initialization
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* for the ZARR dispatch layer.
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*
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* @author Dennis Heimbigner, Ed Hartnett
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*/
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#include "zincludes.h"
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/* Forward */
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static int NCZ_var_par_access(int ncid, int varid, int par_access);
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static int NCZ_show_metadata(int ncid);
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static const NC_Dispatch NCZ_dispatcher = {
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NC_FORMATX_NCZARR,
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NC_DISPATCH_VERSION,
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NCZ_create,
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NCZ_open,
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NCZ_redef,
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NCZ__enddef,
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NCZ_sync,
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NCZ_abort,
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NCZ_close,
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NCZ_set_fill,
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NCZ_inq_format,
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NCZ_inq_format_extended,
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NCZ_inq,
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NCZ_inq_type,
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NCZ_def_dim,
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NCZ_inq_dimid,
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NCZ_inq_dim,
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NCZ_inq_unlimdim,
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NCZ_rename_dim,
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NCZ_inq_att,
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NCZ_inq_attid,
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NCZ_inq_attname,
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NCZ_rename_att,
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NCZ_del_att,
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NCZ_get_att,
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NCZ_put_att,
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NCZ_def_var,
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NCZ_inq_varid,
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NCZ_rename_var,
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NCZ_get_vara,
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NCZ_put_vara,
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NCZ_get_vars,
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NCZ_put_vars,
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NCDEFAULT_get_varm,
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NCDEFAULT_put_varm,
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NCZ_inq_var_all,
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NCZ_var_par_access,
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NCZ_def_var_fill,
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NCZ_show_metadata,
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NCZ_inq_unlimdims,
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NCZ_inq_ncid,
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NCZ_inq_grps,
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NCZ_inq_grpname,
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NCZ_inq_grpname_full,
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NCZ_inq_grp_parent,
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NCZ_inq_grp_full_ncid,
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NCZ_inq_varids,
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NCZ_inq_dimids,
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NCZ_inq_typeids,
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NCZ_inq_type_equal,
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NCZ_def_grp,
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NCZ_rename_grp,
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NCZ_inq_user_type,
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NCZ_inq_typeid,
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NC_NOTNC4_def_compound,
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NC_NOTNC4_insert_compound,
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NC_NOTNC4_insert_array_compound,
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NC_NOTNC4_inq_compound_field,
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NC_NOTNC4_inq_compound_fieldindex,
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NC_NOTNC4_def_vlen,
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NC_NOTNC4_put_vlen_element,
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NC_NOTNC4_get_vlen_element,
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NC_NOTNC4_def_enum,
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NC_NOTNC4_insert_enum,
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NC_NOTNC4_inq_enum_member,
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NC_NOTNC4_inq_enum_ident,
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NC_NOTNC4_def_opaque,
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NCZ_def_var_deflate,
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NCZ_def_var_fletcher32,
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NCZ_def_var_chunking,
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NCZ_def_var_endian,
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NCZ_def_var_filter,
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NCZ_set_var_chunk_cache,
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NC4_get_var_chunk_cache,
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NCZ_inq_var_filter_ids,
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NCZ_inq_var_filter_info,
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NCZ_def_var_quantize,
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NCZ_inq_var_quantize,
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NCZ_inq_filter_avail,
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};
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const NC_Dispatch* NCZ_dispatch_table = NULL; /* moved here from ddispatch.c */
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/**
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* @internal Initialize the ZARR dispatch layer.
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*
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* @return ::NC_NOERR No error.
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* @author Dennis Heimbigner, Ed Hartnett
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*/
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int ncz_initialized = 0; /**< True if initialization has happened. */
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int
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NCZ_initialize(void)
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{
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int stat;
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NCZ_dispatch_table = &NCZ_dispatcher;
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if (!ncz_initialized)
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NCZ_initialize_internal();
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stat = NCZ_provenance_init();
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if(stat) ncz_initialized = 1;
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return stat;
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}
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/**
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* @internal Finalize the ZARR dispatch layer.
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*
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* @return ::NC_NOERR No error.
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* @author Dennis Heimbigner
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*/
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int
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NCZ_finalize(void)
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{
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NCZ_finalize_internal();
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NCZ_provenance_finalize();
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return NC_NOERR;
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}
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static int
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NCZ_var_par_access(int ncid, int varid, int par_access)
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{
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return NC_NOERR; /* no-op */
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}
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static int
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NCZ_show_metadata(int ncid)
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{
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return NC_NOERR;
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}
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#ifndef ENABLE_NCZARR_FILTERS
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int
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NCZ_def_var_filter(int ncid, int varid, unsigned int id , size_t n , const unsigned int *params)
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{
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NC_UNUSED(ncid);
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NC_UNUSED(varid);
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NC_UNUSED(id);
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NC_UNUSED(n);
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NC_UNUSED(params);
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return REPORT(NC_NOERR,"def_var_filter");
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}
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int
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NCZ_inq_var_filter_ids(int ncid, int varid, size_t* nfilters, unsigned int* filterids)
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{
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NC_UNUSED(ncid);
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NC_UNUSED(varid);
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NC_UNUSED(filterids);
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if(nfilters) *nfilters = 0;
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return REPORT(NC_NOERR,"inq_var_filter_ids");
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}
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int
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NCZ_inq_var_filter_info(int ncid, int varid, unsigned int id, size_t* nparams, unsigned int* params)
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{
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NC_UNUSED(ncid);
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NC_UNUSED(varid);
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NC_UNUSED(id);
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NC_UNUSED(nparams);
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NC_UNUSED(params);
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return REPORT(NC_ENOFILTER,"inq_var_filter_info");
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}
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int
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NCZ_inq_filter_avail(int ncid, unsigned id)
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{
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NC_UNUSED(ncid);
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NC_UNUSED(id);
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return REPORT(NC_ENOFILTER,"inq_filter_avail");
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}
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#endif /*ENABLE_NCZARR_FILTERS*/
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/**************************************************/
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/* Following functions call into libsrc4 */
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int
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NCZ_inq_type(int ncid, nc_type xtype, char *name, size_t *size)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_type(ncid,xtype,name,size)");
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stat = NC4_inq_type(ncid,xtype,name,size);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_dimid(int ncid, const char *name, int *idp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_dimid(ncid,name,idp)");
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stat = NC4_inq_dimid(ncid,name,idp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_unlimdim(int ncid, int *unlimdimidp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_unlimdim(ncid,unlimdimidp)");
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stat = NC4_inq_unlimdim(ncid,unlimdimidp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_varid(int ncid, const char* name, int *varidp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_varid(ncid,name,varidp)");
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stat = NC4_inq_varid(ncid,name,varidp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_ncid(int ncid, const char* name, int* grpidp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_ncid(ncid,name,grpidp)");
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stat = NC4_inq_ncid(ncid,name,grpidp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_grps(int ncid, int* n, int* ncids)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_grps(ncid,n,ncids)");
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stat = NC4_inq_grps(ncid,n,ncids);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_grpname(int ncid, char* name)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_grpname(ncid,name)");
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stat = NC4_inq_grpname(ncid,name);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_grpname_full(int ncid, size_t* lenp, char* fullname)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_grpname_full(ncid,lenp,fullname)");
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stat = NC4_inq_grpname_full(ncid,lenp,fullname);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_grp_parent(int ncid, int* parentidp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_grp_parent(ncid,parentidp)");
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stat = NC4_inq_grp_parent(ncid,parentidp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_grp_full_ncid(int ncid, const char* fullname, int* grpidp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_grp_full_ncid(ncid,fullname,grpidp)");
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stat = NC4_inq_grp_full_ncid(ncid,fullname,grpidp);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_varids(int ncid, int* nvars, int* varids)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_varids(ncid,nvars,varids)");
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stat = NC4_inq_varids(ncid,nvars,varids);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_dimids(int ncid, int* ndims, int* dimids, int inclparents)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_dimids(ncid,ndims,dimids,inclparents)");
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stat = NC4_inq_dimids(ncid,ndims,dimids,inclparents);
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return ZUNTRACE(stat);
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}
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int
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NCZ_inq_user_type(int ncid, nc_type xtype, char* name, size_t* size, nc_type* basetid, size_t* nfields, int* classp)
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{
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int stat = NC_NOERR;
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ZTRACE(0,"NC4_inq_user_type(ncid,xtype,name,size,basetid,nfields,classp)");
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stat = NC4_inq_user_type(ncid,xtype,name,size,basetid,nfields,classp);
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return ZUNTRACE(stat);
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}
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