124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* PostGIS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* PostGIS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
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*
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**********************************************************************
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*
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* Copyright 2011 Kashif Rasul <kashif.rasul@gmail.com>
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*
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**********************************************************************/
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#include <assert.h>
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#include "postgres.h"
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#include "../postgis_config.h"
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#include "lwgeom_pg.h"
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#include "liblwgeom.h"
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#include "lwgeom_cache.h"
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#if defined(HAVE_LIBJSON)
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#include <json.h>
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/* We don't include <utils/builtins.h> to avoid collisions with json-c/json.h */
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static text*
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cstring2text(const char *cstring)
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{
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size_t len = strlen(cstring);
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text *result = (text *) palloc(len + VARHDRSZ);
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SET_VARSIZE(result, len + VARHDRSZ);
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memcpy(VARDATA(result), cstring, len);
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return result;
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}
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static char*
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text2cstring(const text *textptr)
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{
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size_t size = VARSIZE_ANY_EXHDR(textptr);
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char *str = lwalloc(size+1);
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memcpy(str, VARDATA(textptr), size);
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str[size]='\0';
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return str;
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}
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#endif
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Datum geom_from_geojson(PG_FUNCTION_ARGS);
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Datum postgis_libjson_version(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(postgis_libjson_version);
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Datum postgis_libjson_version(PG_FUNCTION_ARGS)
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{
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#ifndef HAVE_LIBJSON
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PG_RETURN_NULL();
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#else /* HAVE_LIBJSON */
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# ifdef JSON_C_VERSION
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const char *ver = json_c_version();
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# else
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const char *ver = "UNKNOWN";
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# endif
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text *result = cstring2text(ver);
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PG_RETURN_POINTER(result);
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#endif
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}
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PG_FUNCTION_INFO_V1(geom_from_geojson);
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Datum geom_from_geojson(PG_FUNCTION_ARGS)
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{
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#ifndef HAVE_LIBJSON
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elog(ERROR, "You need JSON-C for ST_GeomFromGeoJSON");
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PG_RETURN_NULL();
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#else /* HAVE_LIBJSON */
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GSERIALIZED *geom;
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LWGEOM *lwgeom;
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text *geojson_input;
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char *geojson;
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char *srs = NULL;
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int32_t srid = WGS84_SRID;
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/* Get the geojson stream */
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if (PG_ARGISNULL(0))
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PG_RETURN_NULL();
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geojson_input = PG_GETARG_TEXT_P(0);
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geojson = text2cstring(geojson_input);
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lwgeom = lwgeom_from_geojson(geojson, &srs);
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if (!lwgeom)
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{
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/* Shouldn't get here */
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elog(ERROR, "lwgeom_from_geojson returned NULL");
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PG_RETURN_NULL();
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}
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if (srs)
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{
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srid = GetSRIDCacheBySRS(fcinfo, srs);
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lwfree(srs);
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}
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lwgeom_set_srid(lwgeom, srid);
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geom = geometry_serialize(lwgeom);
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lwgeom_free(lwgeom);
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PG_RETURN_POINTER(geom);
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#endif
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}
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