https://bz.apache.org/bugzilla/show_bug.cgi?id=63344
Bug ID: 63344
Summary: Support POIFSFileSystem that uses a temp file for
backing - to support encryption of large files
Product: POI
Version: 4.0.x-dev
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
https://stackoverflow.com/questions/55658495/apache-poi-encrypting-xlsx-file-greater-than-2gb-fails
POIFSFileSystem is needed for agile encryption. By default, POIFSFileSystem
uses in-memory data source.
The support for file-backed data source assumes the file is OLE encoded. This
is a problem if you want to take an OOXML file and encrypt it.
My suggestion is that we create a TempFilePOIFSFileSystem that uses an
initially empty temp file as the data source backing.
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