mirror of https://github.com/ecmwf/eccodes.git
55 lines
1.7 KiB
C++
55 lines
1.7 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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#include "grib_api_internal.h"
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int main(int argc, char** argv)
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{
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ECCODES_ASSERT(argc == 2);
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int err = 0;
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size_t nvalues = 0;
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const char* filename = argv[1];
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grib_context* c = grib_context_get_default();
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FILE* fin = fopen(filename, "r");
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ECCODES_ASSERT(fin);
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grib_handle* h = grib_handle_new_from_file(0, fin, &err);
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ECCODES_ASSERT(h);
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ECCODES_ASSERT(!err);
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grib_accessor* a = grib_find_accessor(h, "codedValues");
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ECCODES_ASSERT(a);
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GRIB_CHECK(grib_get_size(h, "codedValues", &nvalues), 0);
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double* all_values = (double*)grib_context_malloc(c, sizeof(double) * nvalues);
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double* sub_values = (double*)grib_context_malloc(c, sizeof(double) * nvalues);
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ECCODES_ASSERT(all_values);
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ECCODES_ASSERT(sub_values);
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size_t len = nvalues;
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GRIB_CHECK(a->unpack_double(all_values, &len), 0);
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size_t start = nvalues / 10;
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len = nvalues / 5;
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printf("nvalues=%zu, start=%zu, len=%zu\n", nvalues, start, len);
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GRIB_CHECK(a->unpack_double_subarray(sub_values, start, len), 0);
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for (size_t i = 0; i < len; ++i) {
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//printf("sub[%zu]=%.10e\n", start + i, sub_values[i]);
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ECCODES_ASSERT(all_values[start+i] == sub_values[i]);
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}
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grib_context_free(c, all_values);
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grib_context_free(c, sub_values);
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grib_handle_delete(h);
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fclose(fin);
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return 0;
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}
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