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Macros
#define	H5_SZIP_ALL_MASKS (H5_SZIP_CHIP_OPTION_MASK\|H5_SZIP_EC_OPTION_MASK\|H5_SZIP_NN_OPTION_MASK)

#define	H5_SZIP_ALLOW_K13_OPTION_MASK 1

#define	H5_SZIP_CHIP_OPTION_MASK 2

#define	H5_SZIP_EC_OPTION_MASK 4

#define	H5_SZIP_LSB_OPTION_MASK 8

#define	H5_SZIP_MAX_PIXELS_PER_BLOCK 32

#define	H5_SZIP_MSB_OPTION_MASK 16

#define	H5_SZIP_NN_OPTION_MASK 32

#define	H5_SZIP_RAW_OPTION_MASK 128

#define	H5Z_FILTER_BLOSC 32001

#define	H5Z_FILTER_BZIP2 307

#define	H5Z_FILTER_DEFLATE 1

#define	H5Z_FILTER_FLETCHER32 3

#define	H5Z_FILTER_SHUFFLE 2

#define	H5Z_FILTER_SZIP 4

#define	H5Z_FILTER_ZSTD 32015

#define	NC_MAX_PIXELS_PER_BLOCK 32
	The maximum allowed setting for pixels_per_block when calling nc_def_var_szip(). More...

#define	NC_SZIP_EC 4
	Selects entropy coding method for szip. More...

#define	NC_SZIP_NN 32
	Selects nearest neighbor coding method for szip. More...

Enumerations
enum	BLOSC_SHUFFLE { BLOSC_NOSHUFFLE =0 , BLOSC_SHUFFLE =1 , BLOSC_BITSHUFFLE =2 }

enum	BLOSC_SUBCOMPRESSORS { BLOSC_LZ =0 , BLOSC_LZ4 =1 , BLOSC_LZ4HC =2 , BLOSC_SNAPPY =3 , BLOSC_ZLIB =4 , BLOSC_ZSTD =5 }

Functions
EXTERNL int	nc_def_var_blosc (int ncid, int varid, unsigned subcompressor, unsigned level, unsigned blocksize, unsigned addshuffle)
	Turn on blosc for a variable. More...

EXTERNL int	nc_def_var_bzip2 (int ncid, int varid, int level)
	Turn on bzip2 compression for a variable. More...

EXTERNL int	nc_def_var_filter (int ncid, int varid, unsigned int id, size_t nparams, const unsigned int *parms)
	Define a new variable filter Assumes HDF5 format using unsigned ints. More...

EXTERNL int	nc_def_var_zstandard (int ncid, int varid, int level)
	Turn on Zstandard compression for a variable. More...

EXTERNL int	nc_inq_filter_avail (int ncid, unsigned id)
	Test if filter is available. More...

EXTERNL int	nc_inq_var_blosc (int ncid, int varid, int hasfilterp, unsigned subcompressorp, unsigned levelp, unsigned blocksizep, unsigned *addshufflep)
	Learn whether Blosc compression is on for a variable, and, if so, the settings. More...

EXTERNL int	nc_inq_var_bzip2 (int ncid, int varid, int hasfilterp, int levelp)
	Learn whether bzip2 compression is on for a variable, and, if so, the level setting. More...

EXTERNL int	nc_inq_var_filter (int ncid, int varid, unsigned int idp, size_t nparams, unsigned int *params)
	Find the first filter (if any) associated with a variable. More...

EXTERNL int	nc_inq_var_filter_ids (int ncid, int varid, size_t nfilters, unsigned int filterids)
	Find the set of filters (if any) associated with a variable. More...

EXTERNL int	nc_inq_var_filter_info (int ncid, int varid, unsigned int id, size_t nparams, unsigned int params)
	Find the the param info about filter (if any) associated with a variable and with specified id. More...

EXTERNL int	nc_inq_var_zstandard (int ncid, int varid, int hasfilterp, int levelp)
	Learn whether Zstandard compression is on for a variable, and, if so, the level setting. More...

Macro Definition Documentation

◆ NC_MAX_PIXELS_PER_BLOCK

#define NC_MAX_PIXELS_PER_BLOCK 32

The maximum allowed setting for pixels_per_block when calling nc_def_var_szip().

Definition at line 43 of file netcdf_filter.h.

◆ NC_SZIP_EC

#define NC_SZIP_EC 4

Selects entropy coding method for szip.

Definition at line 36 of file netcdf_filter.h.

◆ NC_SZIP_NN

#define NC_SZIP_NN 32

Selects nearest neighbor coding method for szip.

Definition at line 37 of file netcdf_filter.h.

Function Documentation

◆ nc_def_var_bzip2()

EXTERNL int nc_def_var_bzip2	(	int	ncid,
		int	varid,
		int	level
	)

Turn on bzip2 compression for a variable.

Parameters

ncid	File ID.
varid	Variable ID.
level	From 1 to 9. Set the block size to 100k, 200k ... 900k when compressing. (bzip2 default level is 9).

Returns: 0 for success, error code otherwise.

Author: Dennis Heimbigner, Ed Hartnett

Definition at line 332 of file dfilter.c.

◆ nc_def_var_filter()

EXTERNL int nc_def_var_filter	(	int	ncid,
		int	varid,
		unsigned int	id,
		size_t	nparams,
		const unsigned int *	params
	)

Define a new variable filter Assumes HDF5 format using unsigned ints.

Only variables with chunked storage can use filters.

Parameters

ncid	File and group ID.
varid	Variable ID.
id	Filter ID.
nparams	Number of filter parameters.
params	Filter parameters.

Returns: NC_NOERR No error.; NC_EINVAL Variable must be chunked.; NC_EBADID Bad ID.

Author: Dennis Heimbigner

Definition at line 124 of file dfilter.c.

◆ nc_def_var_zstandard()

EXTERNL int nc_def_var_zstandard	(	int	ncid,
		int	varid,
		int	level
	)

Turn on Zstandard compression for a variable.

Parameters

ncid	File ID.
varid	Variable ID.
level	From -131072 to 22 (depends on Zstandard version). when compressing. Regular compression levels are from 1 up to 19. Use levels >= 20, labeled `--ultra`, cautiously: they require more memory. Negative compression levels that extend the range of speed vs. ratio preferences. The lower the level, the faster the speed (at the cost of compression).

Returns: 0 for success, error code otherwise.

Author: Charlie Zender, Dennis Heimbigner, Ed Hartnett

Definition at line 400 of file dfilter.c.

◆ nc_inq_filter_avail()

EXTERNL int nc_inq_filter_avail	(	int	ncid,
		unsigned	id
	)

Test if filter is available.

Would prefer returning a list of all available filters, but HDF5 does not support that capability.

Parameters

ncid	ID of file for which filter list is desired
id	filter id of interest

Returns: NC_NOERR if the filter is available; NC_EBADID if ncid is invalid; NC_ENOFILTER if filter is not available.

Author: Dennis Heimbigner

Definition at line 213 of file dfilter.c.

◆ nc_inq_var_blosc()

EXTERNL int nc_inq_var_blosc	(	int	ncid,
		int	varid,
		int *	hasfilterp,
		unsigned *	subcompressorp,
		unsigned *	levelp,
		unsigned *	blocksizep,
		unsigned *	addshufflep
	)

Learn whether Blosc compression is on for a variable, and, if so, the settings.

Parameters

ncid	File ID.
varid	Variable ID.
hasfilterp	Pointer that gets a 0 if blosc is not in use for this var, and a 1 if it is. Ignored if NULL.
subcompressorp	Pointer that gets the subcompressor, if blosc is in use. Ignored if NULL.
levelp	Pointer that gets the level setting, if blosc is in use. Ignored if NULL.
blocksizep	Pointer that gets the block size, if blosc is in use. Ignored if NULL.
addshufflep	Pointer that gets non-zero value if shuffle is in use, if blosc is in use. Ignored if NULL.

Returns: 0 for success, error code otherwise.

Author: Dennis Heimbigner

Definition at line 527 of file dfilter.c.

◆ nc_inq_var_bzip2()

EXTERNL int nc_inq_var_bzip2	(	int	ncid,
		int	varid,
		int *	hasfilterp,
		int *	levelp
	)

Learn whether bzip2 compression is on for a variable, and, if so, the level setting.

Parameters

ncid	File ID.
varid	Variable ID.
hasfilterp	Pointer that gets a 0 if bzip2 is not in use for this var, and a 1 if it is. Ignored if NULL.
levelp	Pointer that gets the level setting (from 1 to 9), if bzip2 is in use. Ignored if NULL.

Returns: 0 for success, error code otherwise.

Author: Dennis Heimbigner, Ed Hartnett

Definition at line 363 of file dfilter.c.

◆ nc_inq_var_zstandard()

EXTERNL int nc_inq_var_zstandard	(	int	ncid,
		int	varid,
		int *	hasfilterp,
		int *	levelp
	)

Learn whether Zstandard compression is on for a variable, and, if so, the level setting.

Parameters

ncid	File ID.
varid	Variable ID.
hasfilterp	Pointer that gets a 0 if Zstandard is not in use for this var, and a 1 if it is. Ignored if NULL.
levelp	Pointer that gets the level setting (from -131072 to 22), if Zstandard is in use. Ignored if NULL.

Returns: 0 for success, error code otherwise.

Author: Charlie Zender, Dennis Heimbigner, Ed Hartnett

Definition at line 436 of file dfilter.c.

Macros

Enumerations

Functions

Macro Definition Documentation

◆ NC_MAX_PIXELS_PER_BLOCK

◆ NC_SZIP_EC

◆ NC_SZIP_NN

Function Documentation

◆ nc_def_var_bzip2()

◆ nc_def_var_filter()

◆ nc_def_var_zstandard()

◆ nc_inq_filter_avail()

◆ nc_inq_var_blosc()

◆ nc_inq_var_bzip2()

◆ nc_inq_var_zstandard()