mirror of https://github.com/ecmwf/eccodes.git
291 lines
8.5 KiB
C++
291 lines
8.5 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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/*
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This is used by make_class.pl
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START_CLASS_DEF
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CLASS = accessor
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SUPER = grib_accessor_class_double
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IMPLEMENTS = unpack_double;
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IMPLEMENTS = value_count
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IMPLEMENTS = init
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MEMBERS =const char* values
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MEMBERS =long distinct
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MEMBERS =double* lons
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MEMBERS =long size
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MEMBERS =int save
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END_CLASS_DEF
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*/
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/* START_CLASS_IMP */
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/*
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Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
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Instead edit values between START_CLASS_DEF and END_CLASS_DEF
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or edit "accessor.class" and rerun ./make_class.pl
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*/
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static int unpack_double(grib_accessor*, double* val, size_t* len);
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static int value_count(grib_accessor*, long*);
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static void init(grib_accessor*, const long, grib_arguments*);
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typedef struct grib_accessor_longitudes
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{
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grib_accessor att;
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/* Members defined in gen */
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/* Members defined in double */
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/* Members defined in longitudes */
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const char* values;
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long distinct;
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double* lons;
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long size;
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int save;
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} grib_accessor_longitudes;
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extern grib_accessor_class* grib_accessor_class_double;
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static grib_accessor_class _grib_accessor_class_longitudes = {
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&grib_accessor_class_double, /* super */
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"longitudes", /* name */
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sizeof(grib_accessor_longitudes), /* size */
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0, /* inited */
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0, /* init_class */
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&init, /* init */
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0, /* post_init */
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0, /* destroy */
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0, /* dump */
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0, /* next_offset */
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0, /* get length of string */
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&value_count, /* get number of values */
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0, /* get number of bytes */
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0, /* get offset to bytes */
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0, /* get native type */
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0, /* get sub_section */
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0, /* pack_missing */
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0, /* is_missing */
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0, /* pack_long */
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0, /* unpack_long */
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0, /* pack_double */
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0, /* pack_float */
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&unpack_double, /* unpack_double */
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0, /* unpack_float */
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0, /* pack_string */
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0, /* unpack_string */
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0, /* pack_string_array */
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0, /* unpack_string_array */
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0, /* pack_bytes */
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0, /* unpack_bytes */
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0, /* pack_expression */
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0, /* notify_change */
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0, /* update_size */
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0, /* preferred_size */
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0, /* resize */
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0, /* nearest_smaller_value */
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0, /* next accessor */
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0, /* compare vs. another accessor */
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0, /* unpack only ith value (double) */
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0, /* unpack only ith value (float) */
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0, /* unpack a given set of elements (double) */
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0, /* unpack a given set of elements (float) */
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0, /* unpack a subarray */
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0, /* clear */
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0, /* clone accessor */
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};
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grib_accessor_class* grib_accessor_class_longitudes = &_grib_accessor_class_longitudes;
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/* END_CLASS_IMP */
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static int get_distinct(grib_accessor* a, double** val, long* len);
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static int compare_doubles(const void* a, const void* b);
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static void init(grib_accessor* a, const long l, grib_arguments* c)
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{
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grib_accessor_longitudes* self = (grib_accessor_longitudes*)a;
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int n = 0;
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self->values = grib_arguments_get_name(grib_handle_of_accessor(a), c, n++);
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self->distinct = grib_arguments_get_long(grib_handle_of_accessor(a), c, n++);
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self->save = 0;
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self->lons = 0;
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a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
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}
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static int unpack_double(grib_accessor* a, double* val, size_t* len)
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{
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grib_context* c = a->context;
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grib_accessor_longitudes* self = (grib_accessor_longitudes*)a;
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int ret = 0;
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double* v = val;
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double dummyLat = 0;
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size_t size = 0;
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long count = 0;
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grib_iterator* iter = NULL;
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self->save = 1;
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ret = value_count(a, &count);
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if (ret) return ret;
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size = count;
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if (*len < size) {
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/* self->lons are computed in value_count*/
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if (self->lons) {
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grib_context_free(c, self->lons);
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self->lons = NULL;
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}
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return GRIB_ARRAY_TOO_SMALL;
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}
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self->save = 0;
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/* self->lons are computed in value_count*/
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if (self->lons) {
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int i;
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*len = self->size;
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for (i = 0; i < size; i++)
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val[i] = self->lons[i];
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grib_context_free(c, self->lons);
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self->lons = NULL;
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self->size = 0;
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return GRIB_SUCCESS;
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}
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// ECC-1525 Performance: We do not need the values to be decoded
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iter = grib_iterator_new(grib_handle_of_accessor(a), GRIB_GEOITERATOR_NO_VALUES, &ret);
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if (ret != GRIB_SUCCESS) {
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if (iter)
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grib_iterator_delete(iter);
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grib_context_log(c, GRIB_LOG_ERROR, "longitudes: Unable to create iterator");
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return ret;
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}
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while (grib_iterator_next(iter, &dummyLat, v++, NULL)) {}
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grib_iterator_delete(iter);
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*len = size;
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return ret;
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}
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static int value_count(grib_accessor* a, long* len)
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{
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grib_accessor_longitudes* self = (grib_accessor_longitudes*)a;
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grib_handle* h = grib_handle_of_accessor(a);
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grib_context* c = a->context;
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double* val = NULL;
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int ret;
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size_t size;
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*len = 0;
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if ((ret = grib_get_size(h, self->values, &size)) != GRIB_SUCCESS) {
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grib_context_log(h->context, GRIB_LOG_ERROR, "longitudes: Unable to get size of %s", self->values);
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return ret;
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}
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*len = size;
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// See ECC-1792
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// Give priority to the Grid Section (rather than the Data Section)
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long numberOfDataPoints = 0;
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if (grib_get_long(h, "numberOfDataPoints", &numberOfDataPoints) == GRIB_SUCCESS) {
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*len = numberOfDataPoints;
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}
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if (self->distinct) {
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ret = get_distinct(a, &val, len);
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if (ret != GRIB_SUCCESS)
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return ret;
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if (self->save) {
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self->lons = val;
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self->size = *len;
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}
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else {
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grib_context_free(c, val);
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}
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}
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return ret;
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}
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static int get_distinct(grib_accessor* a, double** val, long* len)
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{
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long count = 0;
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double prev;
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double* v = NULL;
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double* v1 = NULL;
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double dummyLat = 0;
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int ret = 0;
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int i;
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size_t size = *len;
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grib_context* c = a->context;
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// Performance: We do not need the values to be decoded
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grib_iterator* iter = grib_iterator_new(grib_handle_of_accessor(a), GRIB_GEOITERATOR_NO_VALUES, &ret);
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if (ret != GRIB_SUCCESS) {
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if (iter)
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grib_iterator_delete(iter);
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grib_context_log(c, GRIB_LOG_ERROR, "longitudes: Unable to create iterator");
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return ret;
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}
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v = (double*)grib_context_malloc_clear(c, size * sizeof(double));
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if (!v) {
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grib_context_log(c, GRIB_LOG_ERROR, "longitudes: Error allocating %zu bytes", size * sizeof(double));
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return GRIB_OUT_OF_MEMORY;
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}
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*val = v;
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while (grib_iterator_next(iter, &dummyLat, v++, NULL)) {}
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grib_iterator_delete(iter);
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v = *val;
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qsort(v, *len, sizeof(double), &compare_doubles);
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v1 = (double*)grib_context_malloc_clear(c, size * sizeof(double));
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if (!v1) {
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grib_context_log(c, GRIB_LOG_ERROR, "longitudes: Error allocating %zu bytes", size * sizeof(double));
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return GRIB_OUT_OF_MEMORY;
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}
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prev = v[0];
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v1[0] = prev;
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count = 1;
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for (i = 1; i < *len; i++) {
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if (v[i] != prev) {
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prev = v[i];
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v1[count] = prev;
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count++;
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}
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}
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grib_context_free(c, v);
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*val = v1;
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*len = count;
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return GRIB_SUCCESS;
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}
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static int compare_doubles(const void* a, const void* b)
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{
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double* arg1 = (double*)a;
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double* arg2 = (double*)b;
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if (*arg1 < *arg2)
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return -1;
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else if (*arg1 == *arg2)
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return 0;
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else
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return 1;
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}
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