Crisis.Ionic.Zip.ZipEntry.SetZip64Flags C# (CSharp) Method

        private void SetZip64Flags()
        {
            // zip64 housekeeping
            _entryRequiresZip64 = new Nullable<bool>
                (_CompressedSize >= 0xFFFFFFFF || _UncompressedSize >= 0xFFFFFFFF || _RelativeOffsetOfLocalHeader >= 0xFFFFFFFF);

            // validate the ZIP64 usage
            if (_container.Zip64 == Zip64Option.Never && _entryRequiresZip64.Value)
                throw new ZipException("Compressed or Uncompressed size, or offset exceeds the maximum value. Consider setting the UseZip64WhenSaving property on the ZipFile instance.");

            _OutputUsesZip64 = new Nullable<bool>(_container.Zip64 == Zip64Option.Always || _entryRequiresZip64.Value);
        }