private void CalcHeapSizes ()
{
if (strings.LargeIx()) {
largeStrings = true;
heapSizes |= StringsHeapMask;
}
if (guid.LargeIx()) {
largeGUID = true;
heapSizes |= GUIDHeapMask;
}
if (blob.LargeIx()) {
largeBlob = true;
heapSizes |= BlobHeapMask;
}
largeUS = us.LargeIx();
}