C++ (Cpp) importPreambuleFromWkb Examples

Example #1

File: ogrpoint.cpp Project: drownedout/datamap

OGRErr OGRPoint::importFromWkb( unsigned char * pabyData,
                                int nSize,
                                OGRwkbVariant eWkbVariant )

{
    OGRwkbByteOrder     eByteOrder;
    OGRBoolean          bIs3D = FALSE;

    OGRErr eErr = importPreambuleFromWkb( pabyData, nSize, eByteOrder, bIs3D, eWkbVariant );
    if( eErr >= 0 )
        return eErr;

    if ( nSize < ((bIs3D) ? 29 : 21) && nSize != -1 )
        return OGRERR_NOT_ENOUGH_DATA;

/* -------------------------------------------------------------------- */
/*      Get the vertex.                                                 */
/* -------------------------------------------------------------------- */
    memcpy( &x, pabyData + 5,     8 );
    memcpy( &y, pabyData + 5 + 8, 8 );
    
    if( OGR_SWAP( eByteOrder ) )
    {
        CPL_SWAPDOUBLE( &x );
        CPL_SWAPDOUBLE( &y );
    }

    if( bIs3D )
    {
        memcpy( &z, pabyData + 5 + 16, 8 );
        if( OGR_SWAP( eByteOrder ) )
        {
            CPL_SWAPDOUBLE( &z );
        }
        nCoordDimension = 3;
    }
    else
    {
        z = 0;
        nCoordDimension = 2;
    }

    /* Detect NaN coordinates --> EMPTY */
    if( x != x && y != y )
        nCoordDimension = -nCoordDimension;

    return OGRERR_NONE;
}

Example #2

File: ogrpoint.cpp Project: Mavrx-inc/gdal

OGRErr OGRPoint::importFromWkb( unsigned char * pabyData,
                                int nSize,
                                OGRwkbVariant eWkbVariant )

{
    OGRwkbByteOrder eByteOrder = wkbNDR;

    flags = 0;
    OGRErr eErr =
        importPreambuleFromWkb( pabyData, nSize, eByteOrder, eWkbVariant );
    pabyData += 5;
    if( eErr != OGRERR_NONE )
        return eErr;

    if( nSize != -1 )
    {
        if( (nSize < 37) && ((flags & OGR_G_3D) && (flags & OGR_G_MEASURED)) )
            return OGRERR_NOT_ENOUGH_DATA;
        else if( (nSize < 29) && ((flags & OGR_G_3D) ||
                                  (flags & OGR_G_MEASURED)) )
            return OGRERR_NOT_ENOUGH_DATA;
        else if( nSize < 21 )
            return OGRERR_NOT_ENOUGH_DATA;
    }

/* -------------------------------------------------------------------- */
/*      Get the vertex.                                                 */
/* -------------------------------------------------------------------- */
    memcpy( &x, pabyData, 8 );
    pabyData += 8;
    memcpy( &y, pabyData, 8 );
    pabyData += 8;

    if( OGR_SWAP( eByteOrder ) )
    {
        CPL_SWAPDOUBLE( &x );
        CPL_SWAPDOUBLE( &y );
    }

    if( flags & OGR_G_3D )
    {
        memcpy( &z, pabyData, 8 );
        pabyData += 8;
        if( OGR_SWAP( eByteOrder ) )
            CPL_SWAPDOUBLE( &z );
    }
    else
    {
        z = 0;
    }
    if( flags & OGR_G_MEASURED )
    {
        memcpy( &m, pabyData, 8 );
        /*pabyData += 8; */
        if( OGR_SWAP( eByteOrder ) )
        {
            CPL_SWAPDOUBLE( &m );
        }
    }
    else
    {
        m = 0;
    }

    // Detect coordinates are not NaN --> NOT EMPTY.
    if( !(CPLIsNan(x) && CPLIsNan(y)) )
        flags |= OGR_G_NOT_EMPTY_POINT;

    return OGRERR_NONE;
}