empty_to_wkb_buf()

static uint8_t* empty_to_wkb_buf ( const LWGEOM *  geom, uint8_t *  buf, uint8_t  variant  )

static

Definition at line 315 of file lwout_wkb.c.

{
        uint32_t wkb_type = lwgeom_wkb_type(geom, variant);
 
        /* Set the endian flag */
        buf = endian_to_wkb_buf(buf, variant);
 
        /* Set the geometry type */
        buf = integer_to_wkb_buf(wkb_type, buf, variant);
 
        /* Set the SRID if necessary */
        if ( lwgeom_wkb_needs_srid(geom, variant) )
                buf = integer_to_wkb_buf(geom->srid, buf, variant);
 
        /* Represent POINT EMPTY as POINT(NaN NaN) */
        if ( geom->type == POINTTYPE )
        {
                const LWPOINT *pt = (LWPOINT*)geom;
                static double nn = NAN;
                int i;
                for ( i = 0; i < FLAGS_NDIMS(pt->point->flags); i++ )
                {
                        buf = double_to_wkb_buf(nn, buf, variant);
                }
        }
        /* Everything else is flagged as empty using num-elements == 0 */
        else
        {
                /* Set nrings/npoints/ngeoms to zero */
                buf = integer_to_wkb_buf(0, buf, variant);
        }
 
        return buf;
}

References double_to_wkb_buf(), endian_to_wkb_buf(), POINTARRAY::flags, FLAGS_NDIMS, integer_to_wkb_buf(), lwgeom_wkb_needs_srid(), lwgeom_wkb_type(), NAN, LWPOINT::point, POINTTYPE, LWGEOM::srid, LWGEOM::type, and variant.

Referenced by lwgeom_to_wkb_buf(), lwline_to_wkb_buf(), lwpoint_to_wkb_buf(), lwpoly_to_wkb_buf(), and lwtriangle_to_wkb_buf().

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