mirror of https://github.com/ecmwf/eccodes.git
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* (C) Copyright 2005- ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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/*
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* test: reading GRIB2 multi fields messages from memory
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*/
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#include "grib_api.h"
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#include <sys/stat.h>
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#include <assert.h>
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#ifndef ECCODES_ON_WINDOWS
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#include <unistd.h>
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#endif
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static void usage(const char* prog)
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{
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fprintf(stderr, "usage: %s [-m] file.grib\n", prog);
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exit(1);
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}
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int main(int argc, char* argv[])
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{
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struct stat finfo;
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char shortName[20] = {
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0,
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};
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size_t len;
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grib_handle* h = NULL;
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size_t fsize;
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unsigned char* data = NULL;
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unsigned char* p = NULL;
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void* pdata = NULL;
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int error = 0;
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int count = 0;
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char* filename = NULL;
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FILE* f = NULL;
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long level = 0;
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grib_context* c = grib_context_get_default();
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if (argc == 3 && !strcmp(argv[1], "-m")) {
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grib_multi_support_on(0);
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filename = argv[2];
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}
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else if (argc == 2)
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filename = argv[1];
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else
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usage(argv[0]);
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assert(filename);
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f = fopen(filename, "rb");
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if (!f) {
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perror(filename);
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exit(1);
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}
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stat(filename, &finfo);
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fsize = finfo.st_size;
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data = (unsigned char*)malloc(fsize);
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p = data;
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if (!data) {
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fprintf(stderr, "unable to allocate %ld bytes\n", (long)fsize);
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exit(1);
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}
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if (fread(data, 1, fsize, f) != fsize) {
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perror(filename);
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exit(1);
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}
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fclose(f);
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pdata = &data;
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while ((h = grib_handle_new_from_multi_message(c, (void**)pdata, &fsize, &error)) != NULL) {
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count++;
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len = 20;
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GRIB_CHECK(grib_get_string(h, "shortName", shortName, &len), "shortName");
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GRIB_CHECK(grib_get_long(h, "level", &level), "level");
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printf("%d %s %ld\n", count, shortName, level);
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grib_handle_delete(h);
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}
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free(p);
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return 0;
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}
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