netcdf-c/examples/C/large_files.c

/*! \file

Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
2015, 2016, 2017, 2018
University Corporation for Atmospheric Research/Unidata.

See \ref copyright file for more info.

*/

#include <stdio.h>
#include <stdlib.h>
#include <netcdf.h>

void
check_err(const int stat, const int line, const char *file) {
    if (stat != NC_NOERR) {
	   (void) fprintf(stderr, "line %d of %s: %s\n", line, file, nc_strerror(stat));
        exit(1);
    }
}

int
main() {			/* create rec2Gp.nc */

   int  stat;			/* return status */
   int  ncid;			/* netCDF id */
   int rec, i, j, k;
   signed char x[] = {42, 21};

   /* dimension ids */
   int rec_dim;
   int i_dim;
   int j_dim;
   int k_dim;
   int n_dim;

#define NUMRECS 1
#define I_LEN 4104
#define J_LEN 1023
#define K_LEN 1023
#define N_LEN 2

   /* dimension lengths */
   size_t rec_len = NC_UNLIMITED;
   size_t i_len = I_LEN;
   size_t j_len = J_LEN;
   size_t k_len = K_LEN;
   size_t n_len = N_LEN;

   /* variable ids */
   int var1_id;
   int x_id;

   /* rank (number of dimensions) for each variable */
#  define RANK_var1 4
#  define RANK_x 2

   /* variable shapes */
   int var1_dims[RANK_var1];
   int x_dims[RANK_x];

   /* enter define mode */
   stat = nc_create("rec2Gp.nc", NC_CLOBBER|NC_64BIT_OFFSET, &ncid);
   check_err(stat,__LINE__,__FILE__);

   /* define dimensions */
   stat = nc_def_dim(ncid, "rec", rec_len, &rec_dim);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_def_dim(ncid, "i", i_len, &i_dim);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_def_dim(ncid, "j", j_len, &j_dim);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_def_dim(ncid, "k", k_len, &k_dim);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_def_dim(ncid, "n", n_len, &n_dim);
   check_err(stat,__LINE__,__FILE__);

   /* define variables */

   var1_dims[0] = rec_dim;
   var1_dims[1] = i_dim;
   var1_dims[2] = j_dim;
   var1_dims[3] = k_dim;
   stat = nc_def_var(ncid, "var1", NC_BYTE, RANK_var1, var1_dims, &var1_id);
   check_err(stat,__LINE__,__FILE__);

   x_dims[0] = rec_dim;
   x_dims[1] = n_dim;
   stat = nc_def_var(ncid, "x", NC_BYTE, RANK_x, x_dims, &x_id);
   check_err(stat,__LINE__,__FILE__);
   /* don't initialize variables with fill values */
   stat = nc_set_fill(ncid, NC_NOFILL, 0);
   check_err(stat,__LINE__,__FILE__);

   /* leave define mode */
   stat = nc_enddef (ncid);
   check_err(stat,__LINE__,__FILE__);

   {			/* store var1 */
       int n = 0;
       static signed char var1[J_LEN][K_LEN];
       static size_t var1_start[RANK_var1] = {0, 0, 0, 0};
       static size_t var1_count[RANK_var1] = {1, 1, J_LEN, K_LEN};
       static size_t x_start[RANK_x] = {0, 0};
       static size_t x_count[RANK_x] = {1, N_LEN};
       for(rec=0; rec<NUMRECS; rec++) {
	   var1_start[0] = rec;
	   x_start[0] = rec;
	   for(i=0; i<I_LEN; i++) {
	       for(j=0; j<J_LEN; j++) {
		   for (k=0; k<K_LEN; k++) {
		       var1[j][k] = n++;
		   }
	       }
	       var1_start[1] = i;
	       stat = nc_put_vara_schar(ncid, var1_id, var1_start, var1_count, &var1[0][0]);
	       check_err(stat,__LINE__,__FILE__);
	   }
       }
       stat = nc_put_vara_schar(ncid, x_id, x_start, x_count, x);
       check_err(stat,__LINE__,__FILE__);
   }

   stat = nc_close(ncid);
   check_err(stat,__LINE__,__FILE__);

   stat = nc_open("rec2Gp.nc", NC_NOWRITE, &ncid);
   check_err(stat,__LINE__,__FILE__);

   {			/* read var1 */
       int n = 0;
       static signed char var1[J_LEN][K_LEN];
       static size_t var1_start[RANK_var1] = {0, 0, 0, 0};
       static size_t var1_count[RANK_var1] = {1, 1, J_LEN, K_LEN};
       static size_t x_start[RANK_x] = {0, 0};
       static size_t x_count[RANK_x] = {1, N_LEN};
       for(rec=0; rec<NUMRECS; rec++) {
	   var1_start[0] = rec;
	   x_start[0] = rec;
	   for(i=0; i<I_LEN; i++) {
	       var1_start[1] = i;
	       stat = nc_get_vara_schar(ncid, var1_id, var1_start, var1_count, &var1[0][0]);
	       check_err(stat,__LINE__,__FILE__);
	       for(j=0; j<J_LEN; j++) {
		   for (k=0; k<K_LEN; k++) {
		       if (var1[j][k] != (signed char) n) {
			   printf("Error on read, var1[%d, %d, %d, %d] = %d wrong, should be %d !\n", rec, i, j, k, var1[j][k], (signed char) n);
			   return 1;
		       }
		       n++;
		   }
	       }
	   }
	   nc_get_vara_schar(ncid, x_id, x_start, x_count, x);
	   if(x[0] != 42 || x[1] != 21) {
	       printf("Error on read, x[] = %d, %d\n", x[0], x[1]);
	       return 1;
	   }
       }
   }
   stat = nc_close(ncid);
   check_err(stat,__LINE__,__FILE__);

   return 0;
}