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

BZIP2_ID

#define BZIP2_ID   307

Definition at line 54 of file filter_example.c.

BZIP2_LEVEL

#define BZIP2_LEVEL   9

Definition at line 56 of file filter_example.c.

CHECK

#define CHECK

(

x

)

check(x,__LINE__)

Definition at line 109 of file filter_example.c.

CHUNKSIZE

#define CHUNKSIZE   4 /* Note: not the total size of the chunk, but size wrt a dim*/

Definition at line 65 of file filter_example.c.

DIMSIZE

#define DIMSIZE   4

Definition at line 64 of file filter_example.c.

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.

MAXERRS

#define MAXERRS   8

Definition at line 61 of file filter_example.c.

NDIMS

#define NDIMS   4

Definition at line 63 of file filter_example.c.

TESTFILE

#define TESTFILE   "bzip2.nc"

Definition at line 58 of file filter_example.c.

Function Documentation

check()

static int check ( int  err, int  line  )

static

Definition at line 99 of file filter_example.c.

compare()

static int compare ( void  )

static

Definition at line 144 of file filter_example.c.

init()

static void init ( int  argc, char **  argv  )

static

Definition at line 282 of file filter_example.c.

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 303 of file filter_example.c.

test_bzip2()

static int test_bzip2 ( void  )

static

Definition at line 169 of file filter_example.c.

verifychunks()

static int verifychunks ( void  )

static

Definition at line 117 of file filter_example.c.

Variable Documentation

actualdims

size_t actualdims = NDIMS

static

Definition at line 69 of file filter_example.c.

actualproduct

size_t actualproduct = 1

static

Definition at line 71 of file filter_example.c.

array

float* array = NULL

static

Definition at line 81 of file filter_example.c.

chunkproduct

size_t chunkproduct = 1

static

Definition at line 72 of file filter_example.c.

chunks

size_t chunks[NDIMS]

static

Definition at line 75 of file filter_example.c.

chunksize

size_t chunksize = CHUNKSIZE

static

Definition at line 68 of file filter_example.c.

dimids

int dimids[NDIMS]

static

Definition at line 80 of file filter_example.c.

dims

size_t dims[NDIMS]

static

Definition at line 74 of file filter_example.c.

dimsize

size_t dimsize = DIMSIZE

static

Definition at line 67 of file filter_example.c.

expected

float* expected = NULL

static

Definition at line 82 of file filter_example.c.

filterid

unsigned int filterid = 0

static

Definition at line 83 of file filter_example.c.

ncid

int ncid

static

Definition at line 79 of file filter_example.c.

nerrs

int nerrs = 0

static

Definition at line 77 of file filter_example.c.

params

unsigned int* params = NULL

static

Definition at line 84 of file filter_example.c.

varid

int varid

static

Definition at line 79 of file filter_example.c.