ptarray_to_wkb_buf()

static uint8_t * ptarray_to_wkb_buf ( const POINTARRAY *  pa, uint8_t *  buf, uint8_t  variant  )

static

Definition at line 397 of file lwout_wkb.c.

{
        uint32_t dims = 2;
        uint32_t pa_dims = FLAGS_NDIMS(pa->flags);
        uint32_t i, j;
        double *dbl_ptr;
 
        /* SFSQL is always 2-d. Extended and ISO use all available dimensions */
        if ( (variant & WKB_ISO) || (variant & WKB_EXTENDED) )
                dims = pa_dims;
 
        /* Set the number of points (if it's not a POINT type) */
        if ( ! ( variant & WKB_NO_NPOINTS ) )
                buf = integer_to_wkb_buf(pa->npoints, buf, variant);
 
        /* Bulk copy the coordinates when: dimensionality matches, output format */
        /* is not hex, and output endian matches internal endian. */
        if ( pa->npoints && (dims == pa_dims) && ! wkb_swap_bytes(variant) && ! (variant & WKB_HEX)  )
        {
                size_t size = pa->npoints * dims * WKB_DOUBLE_SIZE;
                memcpy(buf, getPoint_internal(pa, 0), size);
                buf += size;
        }
        /* Copy coordinates one-by-one otherwise */
        else
        {
                for ( i = 0; i < pa->npoints; i++ )
                {
                        LWDEBUGF(4, "Writing point #%d", i);
                        dbl_ptr = (double*)getPoint_internal(pa, i);
                        for ( j = 0; j < dims; j++ )
                        {
                                LWDEBUGF(4, "Writing dimension #%d (buf = %p)", j, buf);
                                buf = double_to_wkb_buf(dbl_ptr[j], buf, variant);
                        }
                }
        }
        LWDEBUGF(4, "Done (buf = %p)", buf);
        return buf;
}

References double_to_wkb_buf(), POINTARRAY::flags, FLAGS_NDIMS, getPoint_internal(), integer_to_wkb_buf(), LWDEBUGF, POINTARRAY::npoints, variant, WKB_DOUBLE_SIZE, WKB_EXTENDED, WKB_HEX, WKB_ISO, WKB_NO_NPOINTS, and wkb_swap_bytes().

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

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