lwgeom_in_geojson.c

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/**********************************************************************
 *
 * PostGIS - Spatial Types for PostgreSQL
 * http://postgis.net
 *
 * PostGIS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * PostGIS is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with PostGIS.  If not, see <http://www.gnu.org/licenses/>.
 *
 **********************************************************************
 *
 * Copyright 2011 Kashif Rasul <kashif.rasul@gmail.com>
 *
 **********************************************************************/


#include <assert.h>

#include "postgres.h"

#include "../postgis_config.h"
#include "lwgeom_pg.h"
#include "liblwgeom.h"
#include "lwgeom_export.h"

#ifdef HAVE_LIBJSON
# ifdef HAVE_LIBJSON_C
#  include <json-c/json.h>
# else
#  include <json/json.h>
# endif
#endif

Datum geom_from_geojson(PG_FUNCTION_ARGS);
Datum postgis_libjson_version(PG_FUNCTION_ARGS);

PG_FUNCTION_INFO_V1(postgis_libjson_version);
Datum postgis_libjson_version(PG_FUNCTION_ARGS)
{
#ifndef HAVE_LIBJSON
        PG_RETURN_NULL();
#else /* HAVE_LIBJSON  */
# ifdef JSON_C_VERSION
        const char *ver = json_c_version();
# else
        const char *ver = "UNKNOWN";
# endif
        text *result = cstring2text(ver);
        PG_RETURN_POINTER(result);
#endif
}

PG_FUNCTION_INFO_V1(geom_from_geojson);
Datum geom_from_geojson(PG_FUNCTION_ARGS)
{
#ifndef HAVE_LIBJSON
        elog(ERROR, "You need JSON-C for ST_GeomFromGeoJSON");
        PG_RETURN_NULL();
#else /* HAVE_LIBJSON  */

        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        text *geojson_input;
        char *geojson;
        char *srs = NULL;

        /* Get the geojson stream */
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();

        geojson_input = PG_GETARG_TEXT_P(0);
        geojson = text2cstring(geojson_input);

        lwgeom = lwgeom_from_geojson(geojson, &srs);
        if ( ! lwgeom )
        {
                /* Shouldn't get here */
                elog(ERROR, "lwgeom_from_geojson returned NULL");
                PG_RETURN_NULL();
        }

        if ( srs )
        {
                lwgeom_set_srid(lwgeom, getSRIDbySRS(srs));
                lwfree(srs);
        }

        geom = geometry_serialize(lwgeom);
        lwgeom_free(lwgeom);

        PG_RETURN_POINTER(geom);
#endif
}