mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-27 08:49:16 +08:00
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.
88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/*********************************************************************
|
|
* Copyright 2018, UCAR/Unidata
|
|
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
|
|
* $Header: /upc/share/CVS/netcdf-3/ncdump/ncdump.h,v 1.34 2009/12/02 20:03:43 russ Exp $
|
|
*********************************************************************/
|
|
#ifndef _NCDUMP_H_
|
|
#define _NCDUMP_H_
|
|
|
|
typedef
|
|
enum {LANG_C, LANG_F} Nclang;
|
|
|
|
typedef struct { /* specification for how to format dump */
|
|
|
|
char *name; /* name specified with -n or derived from
|
|
* file name */
|
|
|
|
bool_t header_only; /* if true, don't print any variable data */
|
|
|
|
bool_t coord_vals; /* if true, print header and coordinate
|
|
* dimension values (values of variables
|
|
* that are also dimensions), but no other
|
|
* variable data */
|
|
|
|
bool_t brief_data_cmnts; /* if true, put // comments in data section
|
|
* identifying variable and indices, useful
|
|
* for navigating through large
|
|
* multi-dimensional data lists. */
|
|
|
|
bool_t full_data_cmnts; /* if true, put // comments in data section
|
|
* identifying every value, useful for
|
|
* navigating through large
|
|
* multi-dimensional data lists. */
|
|
|
|
bool_t string_times; /* if true, output date-time values as
|
|
* human-readable strings. */
|
|
|
|
bool_t iso_separator; /* if true, use 'T' separator between
|
|
* date and time components of
|
|
* human-readable strings, otherwise
|
|
* use ' ' */
|
|
|
|
bool_t special_atts; /* if true, output special attributes
|
|
* for optimization characteristics:
|
|
* _Compression, _Chunking,
|
|
* _Endianness, _Format, _Checksum,
|
|
* _NoFill, _NetCDF4 */
|
|
|
|
bool_t filter_atts; /* if true, output filters using _Filter in place of
|
|
* _Fletcher32, _Shuffle, and _Deflate. */
|
|
|
|
Nclang data_lang; /* Specifies index conventions used in data
|
|
* comments, either LANG_C (C, 0-based,
|
|
* column major) or LANG_F (Fortran,
|
|
* 1-based, row major) */
|
|
|
|
bool_t with_cache; /* For DAP URLs, get data with client-side
|
|
* caching when each variable is first accessed */
|
|
|
|
int nlvars; /* Number of variables specified with -v
|
|
* option on command line */
|
|
|
|
char** lvars; /* list of variable names specified with -v
|
|
* option on command line */
|
|
|
|
int nlgrps; /* Number of groups specified with -g
|
|
* option on command line */
|
|
|
|
char** lgrps; /* list of group names specified with -g
|
|
* option on command line */
|
|
|
|
idnode_t* grpids; /* list of grpids matching list specified with -g option */
|
|
|
|
int nc_kind; /* kind of netCDF file named on
|
|
* command line, 1 (classic), 2
|
|
* (64-bit offset), 3 (netCDF-4), 4
|
|
* (netCDF-4 classic model), 5 (64-bit data)
|
|
*/
|
|
int nc_extended; /* extended format info fornetCDF file named
|
|
* on command line.
|
|
*/
|
|
int nc_mode; /* mode as reported by inq_format_extended */
|
|
|
|
int xopt_inmemory; /* Use in-memory option; testing only */
|
|
int xopt_props ; /* 1=>Unconditionally Suppress properties attribute */
|
|
} fspec_t;
|
|
|
|
#endif /*_NCDUMP_H_ */
|