1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* (C) Copyright 2005- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
/*
* C Implementation: set_bitmap
*
* Description: how to set a bitmap in a grib message
*
*
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "grib_api.h"
int main(int argc, char** argv) {
int err = 0;
size_t size=0;
FILE* in = NULL;
char* infile = "../data/regular_latlon_surface.grib1";
FILE* out = NULL;
char* outfile = "out.grib1";
grib_handle *h = NULL;
const void* buffer = NULL;
size_t values_len;
double* values;
double missing=0;
int i=0;
in = fopen(infile,"r");
if(!in) {
printf("ERROR: unable to open file %s\n",infile);
return 1;
}
out = fopen(outfile,"w");
if(!in) {
printf("ERROR: unable to open file %s\n",outfile);
return 1;
}
h = grib_handle_new_from_file(0,in,&err);
if (h == NULL) {
printf("Error: unable to create handle from file %s\n",infile);
}
GRIB_CHECK(grib_get_double(h,"missingValue",&missing),0);
/* get the size of the values array*/
GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
values = malloc(values_len*sizeof(double));
/* get data values*/
GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
GRIB_CHECK(grib_set_long(h,"bitmapPresent",1),0);
for(i = 0; i < 10; i++)
values[i]=missing;
GRIB_CHECK(grib_set_double_array(h,"values",values,values_len),0);
/* get the coded message in a buffer */
GRIB_CHECK(grib_get_message(h,&buffer,&size),0);
/* write the buffer in a file*/
if(fwrite(buffer,1,size,out) != size)
{
perror(outfile);
exit(1);
}
/* delete handle */
grib_handle_delete(h);
fclose(in);
fclose(out);
return 0;
}
|
