https://bz.apache.org/bugzilla/show_bug.cgi?id=69464
Bug ID: 69464
Summary: Duplicate entries caused by empty entries in the
middle of the directory
Product: POI
Version: 5.3.0-FINAL
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: dev@poi.apache.org
Reporter: ebo...@apache.org
Target Milestone: ---
While working with MSI files I've spotted a case of duplicate entries in the
directory (aka property table) caused by empty entries in the middle of the
directory.
For example if the file has the following directory (assuming 512 byte sectors
and 4 entries per directory sector):
--- Directory Sector 1 ---
Entry 1
Entry 2
Entry 3
<Empty>
--- Directory Sector 2 ---
<Empty>
Entry 4
Entry 5
Entry 6
When adding an entry the directory is rewritten to:
--- Directory Sector 1 ---
Entry 1
Entry 2
Entry 3
Entry 4
--- Directory Sector 2 ---
Entry 5
Entry 6
New Entry
Entry 6 (duplicate)
The last entry of the directory sector 2 is not rewritten and the previous data
(Entry 6) is left there, creating a duplicate in the directory.
In comparison, in this situation the MS API (or at least signtool when signing
files) seems to fill in the gaps in the directory, and the remaining empty
entries are left as is. The modified directory looks like this:
--- Directory Sector 1 ---
Entry 1
Entry 2
Entry 3
New Entry
--- Directory Sector 2 ---
<Empty>
Entry 4
Entry 5
Entry 6
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