lwpoly_from_gserialized_buffer()

static LWPOLY* lwpoly_from_gserialized_buffer ( uint8_t *  data_ptr, uint8_t  g_flags, size_t *  g_size  )

static

Definition at line 1313 of file g_serialized.c.

{
        uint8_t *start_ptr = data_ptr;
        LWPOLY *poly;
        uint8_t *ordinate_ptr;
        uint32_t nrings = 0;
        uint32_t i = 0;
 
        assert(data_ptr);
 
        poly = (LWPOLY*)lwalloc(sizeof(LWPOLY));
        poly->srid = SRID_UNKNOWN; /* Default */
        poly->bbox = NULL;
        poly->type = POLYGONTYPE;
        poly->flags = g_flags;
 
        data_ptr += 4; /* Skip past the polygontype. */
        nrings = gserialized_get_uint32_t(data_ptr); /* Zero => empty geometry */
        poly->nrings = nrings;
        LWDEBUGF(4, "nrings = %d", nrings);
        data_ptr += 4; /* Skip past the nrings. */
 
        ordinate_ptr = data_ptr; /* Start the ordinate pointer. */
        if ( nrings > 0)
        {
                poly->rings = (POINTARRAY**)lwalloc( sizeof(POINTARRAY*) * nrings );
                poly->maxrings = nrings;
                ordinate_ptr += nrings * 4; /* Move past all the npoints values. */
                if ( nrings % 2 ) /* If there is padding, move past that too. */
                        ordinate_ptr += 4;
        }
        else /* Empty polygon */
        {
                poly->rings = NULL;
                poly->maxrings = 0;
        }
 
        for ( i = 0; i < nrings; i++ )
        {
                uint32_t npoints = 0;
 
                /* Read in the number of points. */
                npoints = gserialized_get_uint32_t(data_ptr);
                data_ptr += 4;
 
                /* Make a point array for the ring, and move the ordinate pointer past the ring ordinates. */
                poly->rings[i] = ptarray_construct_reference_data(FLAGS_GET_Z(g_flags), FLAGS_GET_M(g_flags), npoints, ordinate_ptr);
 
                ordinate_ptr += sizeof(double) * FLAGS_NDIMS(g_flags) * npoints;
        }
 
        if ( g_size )
                *g_size = ordinate_ptr - start_ptr;
 
        return poly;
}

References LWPOLY::bbox, LWPOLY::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, genraster::g_size, gserialized_get_uint32_t(), lwalloc(), LWDEBUGF, LWPOLY::maxrings, LWPOLY::nrings, POLYGONTYPE, ptarray_construct_reference_data(), LWPOLY::rings, LWPOLY::srid, SRID_UNKNOWN, and LWPOLY::type.

Referenced by lwgeom_from_gserialized_buffer().

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