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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.
*/
#include "grib_api_internal.h"
#include "grib_sh_values.h" // array 'values' defined here
#define ILCHAM 992
#define MTRONC 30
#define STRONC 10
#define TOLERANCE 1e-5
int main(int argc, char* argv[])
{
size_t len, size;
grib_handle* h = NULL;
double zval[ILCHAM];
int i, m, n, k, err;
FILE* fin = NULL;
FILE* fout = NULL;
const void* buffer = NULL;
char* in_filename = NULL;
char* out_filename = NULL;
char packingType[50] = {0,};
bool do_compare = true;
ECCODES_ASSERT(argc == 3);
in_filename = argv[1];
out_filename = argv[2];
printf("Opening file '%s'...\n", in_filename);
fin = fopen(in_filename, "rb");
ECCODES_ASSERT(fin);
h = grib_handle_new_from_file(0, fin, &err);
ECCODES_ASSERT(h);
ECCODES_ASSERT(!err);
len = sizeof(packingType);
GRIB_CHECK(grib_get_string(h, "packingType", packingType, &len), 0);
ECCODES_ASSERT( STR_EQUAL(packingType, "spectral_complex") || STR_EQUAL(packingType, "spectral_simple") );
GRIB_CHECK(grib_set_long(h, "pentagonalResolutionParameterJ", MTRONC), 0);
GRIB_CHECK(grib_set_long(h, "pentagonalResolutionParameterK", MTRONC), 0);
GRIB_CHECK(grib_set_long(h, "pentagonalResolutionParameterM", MTRONC), 0);
GRIB_CHECK(grib_set_long(h, "bitsPerValue", 16), 0);
if (STR_EQUAL(packingType, "spectral_complex")) {
GRIB_CHECK(grib_set_long(h, "subSetJ", STRONC), 0);
GRIB_CHECK(grib_set_long(h, "subSetK", STRONC), 0);
GRIB_CHECK(grib_set_long(h, "subSetM", STRONC), 0);
GRIB_CHECK(grib_set_long(h, "unpackedSubsetPrecision", 1), 0);
} else {
do_compare = false;
}
printf("Encode values...\n");
GRIB_CHECK(grib_set_double_array(h, "values", values, ILCHAM), 0);
// Write to a temporary GRIB file
printf("Save to file '%s'...\n", out_filename);
fout = fopen(out_filename, "wb");
GRIB_CHECK(grib_get_message(h, &buffer, &size), 0);
if (fwrite(buffer, 1, size, fout) != size) {
ECCODES_ASSERT(!"Failed to write data");
}
fclose(fout);
if (do_compare) {
printf("Decode values and compare...\n");
len = ILCHAM;
GRIB_CHECK(grib_get_double_array(h, "values", zval, &len), 0);
// Compare our values
for (i = 0; i < ILCHAM; ++i) {
const double diff = fabs(zval[i] - values[i]);
if (diff > TOLERANCE) {
fprintf(stderr, "Unpacked value different: i=%d values[i]=%.10g zval[i]=%.10g (diff=%.10g)\n", i, values[i], zval[i], diff);
return 1;
}
}
for (m = 0, k = 0; m < MTRONC + 1; m++) {
for (n = m; n < MTRONC + 1; k++, n++) {
// Check sub-truncation was fully preserved in IEEE-32
if ((m < STRONC + 1) && (n < STRONC + 1) && (((float)zval[2 * k] != (float)values[2 * k]) || ((float)zval[2 * k + 1] != (float)values[2 * k + 1]))) {
printf("Unpacked sub-truncation was not fully preserved; coefficients for wave number (m=%d,n=%d) have been modified\n", m, n);
return 1;
}
}
}
}
GRIB_CHECK(grib_handle_delete(h), 0);
fclose(fin);
// Read in the saved GRIB file
if (do_compare) {
printf("Load values from saved file and compare....\n");
fin = fopen(out_filename, "rb"); ECCODES_ASSERT(fin);
h = grib_handle_new_from_file(0, fin, &err); ECCODES_ASSERT(h);
GRIB_CHECK(grib_get_double_array(h, "values", zval, &len), 0);
for (i = 0; i < ILCHAM; ++i) {
const double diff = fabs(zval[i] - values[i]);
if (diff > TOLERANCE) {
fprintf(stderr, "Unpacked value different: i=%d values[i]=%.10g zval[i]=%.10g (diff=%.10g)\n", i, values[i], zval[i], diff);
return 1;
}
}
GRIB_CHECK(grib_handle_delete(h), 0);
fclose(fin);
}
printf("OK\n");
return 0;
}
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