filter_example.c File Reference

Example program for write then read of a variable using bzip2 compression. More...

#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <hdf5.h>
#include "netcdf.h"
#include "netcdf_filter.h"

Go to the source code of this file.

Macros
#define	BZIP2_ID   307
#define	BZIP2_LEVEL   9
#define	CHECK(x)   check(x,__LINE__)
#define	CHUNKSIZE   4 /* Note: not the total size of the chunk, but size wrt a dim*/
#define	DIMSIZE   4
#define	ERRR
#define	MAXERRS   8
#define	NDIMS   4
#define	TESTFILE   "bzip2.nc"

Functions
static int	check (int err, int line)
static int	compare (void)
static void	init (int argc, char **argv)
int	main (int argc, char **argv)
static int	test_bzip2 (void)
static int	verifychunks (void)

Variables
static size_t	actualdims = NDIMS
static size_t	actualproduct = 1
static float *	array = NULL
static size_t	chunkproduct = 1
static size_t	chunks [NDIMS]
static size_t	chunksize = CHUNKSIZE
static int	dimids [NDIMS]
static size_t	dims [NDIMS]
static size_t	dimsize = DIMSIZE
static float *	expected = NULL
static unsigned int	filterid = 0
static int	ncid
static int	nerrs = 0
static unsigned int *	params = NULL
static int	varid

Detailed Description

Example program for write then read of a variable using bzip2 compression.

This is an example which creates a file with a variable that is compressed using bzip2. Then it reads that file and verifies that it returned the correct uncompressed data.

The meta-data (.cdl) for the created file is as follows:

netcdf bzip2 {
dimensions:
    dim0 = 4 ;
    dim1 = 4 ;
    dim2 = 4 ;
    dim3 = 4 ;
variables:
    float var(dim0, dim1, dim2, dim3) ;
        var:_Storage = "chunked" ;
        var:_ChunkSizes = 4, 4, 4, 4 ;
        var:_Filter = "307,9" ;
        var:_NoFill = "true" ;
data:
 
 var =
  0, 1, 2, 3,
  4, 5, 6, 7,
  ...
  252, 253, 254, 255 ;
}

Definition in file filter_example.c.

Macro Definition Documentation

ERRR

#define ERRR

Value:

do { \
fflush(stdout); /* Make sure our stdout is synced with stderr. */ \
fprintf(stderr, "Sorry! Unexpected result, %s, line: %d\n", \
    __FILE__, __LINE__);                    \
nerrs++;\
} while (0)

Definition at line 91 of file filter_example.c.