gserialized_datum_get_internals_p()

int gserialized_datum_get_internals_p	(	Datum	gsdatum,
		GBOX *	gbox,
		lwflags_t *	flags,
		uint8_t *	type,
		int32_t *	srid
	)

Peak into a GSERIALIZED datum to find its bounding box and some other metadata.

If the box is there, copy it out and return it. If not, calculate the box from the full object and return the box based on that. If no box is available, return LW_FAILURE, otherwise LW_SUCCESS.

Definition at line 475 of file gserialized_gist_2d.c.

{
        int result = LW_SUCCESS;
        GSERIALIZED *gpart = NULL;
        int need_detoast = PG_GSERIALIZED_DATUM_NEEDS_DETOAST((struct varlena *)gsdatum);
        if (need_detoast)
        {
                gpart = (GSERIALIZED *)PG_DETOAST_DATUM_SLICE(gsdatum, 0, gserialized_max_header_size());
        }
        else
        {
                gpart = (GSERIALIZED *)gsdatum;
        }
 
        if (!gserialized_has_bbox(gpart) && need_detoast && LWSIZE_GET(gpart->size) >= gserialized_max_header_size())
        {
                /* The headers don't contain a bbox and the object is larger than what we retrieved, so
                 * we now detoast it completely */
                POSTGIS_FREE_IF_COPY_P(gpart, gsdatum);
                gpart = (GSERIALIZED *)PG_DETOAST_DATUM(gsdatum);
        }
 
        result = gserialized_get_gbox_p(gpart, gbox);
        *flags = gserialized_get_lwflags(gpart);
        *srid = gserialized_get_srid(gpart);
        *type = gserialized_get_type(gpart);
 
        POSTGIS_FREE_IF_COPY_P(gpart, gsdatum);
        return result;
}

References gserialized_get_gbox_p(), gserialized_get_lwflags(), gserialized_get_srid(), gserialized_get_type(), gserialized_has_bbox(), gserialized_max_header_size(), LW_SUCCESS, LWSIZE_GET, POSTGIS_FREE_IF_COPY_P, result, GSERIALIZED::size, and ovdump::type.

Referenced by gserialized_datum_get_gbox_p(), ST_BoundingDiagonal(), and ST_ClipByBox2d().

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