The stream end position may exceed the range of 32-bit integer types when parsing large MS documents. Using a smaller type can lead to overflow and incorrect parsing results. Switch to sal_uInt64 to safely handle large values and avoid data loss during import. Change-Id: Ie8a4213007f1d902e98c2fd0895efb64045c8080 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/198702 Tested-by: Jenkins Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>