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/*
* (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: grib_multi_write
*
* Description: How to encode GRIB2 messages containing multiple fields
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "eccodes.h"
static void usage(const char* prog)
{
printf("usage: %s in.grib out.grib\n", prog);
exit(1);
}
int main(int argc, char** argv)
{
int err = 0;
FILE* in = NULL;
FILE* of = NULL;
long edition, step;
char* filename = NULL;
char* ofilename = NULL;
codes_handle* h = NULL;
codes_multi_handle* mh = NULL;
const int start_section = 4; /* Grib2 Product Definition Section */
if (argc < 3) usage(argv[0]);
filename = argv[1];
ofilename = argv[2];
/* open input file */
in = fopen(filename, "rb");
if (!in) {
fprintf(stderr, "ERROR: unable to open input file %s\n", filename);
return 1;
}
/* new grib handle from input file */
h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
CODES_CHECK(err, 0);
CODES_CHECK(codes_get_long(h, "edition", &edition), 0);
if (edition != 2) {
fprintf(stderr, "ERROR: Input grib must be edition 2 for multi fields\n");
exit(1);
}
/* create a new empty multi field handle */
mh = codes_grib_multi_handle_new(0);
if (!mh) {
fprintf(stderr, "ERROR: Unable to create multi field handle\n");
exit(1);
}
for (step = 12; step <= 120; step += 12) {
/* set step */
codes_set_long(h, "step", step);
/* append h to mh repeating from section 4 */
/* i.e. starting from section 4 all the sections to the end of the message will be copied */
codes_grib_multi_handle_append(h, start_section, mh);
}
/* open output file */
of = fopen(ofilename, "w");
if (!of) {
fprintf(stderr, "ERROR: unable to open output file %s\n", ofilename);
exit(1);
}
/* write multi fields handle to output file */
codes_grib_multi_handle_write(mh, of);
fclose(of);
/* release memory */
codes_handle_delete(h);
codes_grib_multi_handle_delete(mh);
fclose(in);
return 0;
}
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