https://issues.apache.org/bugzilla/show_bug.cgi?id=56437
Bug ID: 56437
Summary: [PATCH] Streaming write support in NPOIFS
Product: POI
Version: 3.11-dev
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: [email protected]
Reporter: [email protected]
Created attachment 31544
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31544&action=edit
[PATCH] Streaming write support in NPOIFS
This patch adds the following:
- streaming write support in NPOIFS *)
- POIFSWriterListener support in NPOIFS
- fixed/updated NPropertyTable entries on write
While developing this patch, I've tried to stick (i.e. be binary compatible) to
the output of POIFS, but apparently this is not necessary. So the parts of the
OLE-container look differently when a new file is saved with NPOIFS vs. POIFS:
- The FAT entry: end of file (POIFS) vs. second block (= block 1)
- The first BAT entry: second last block (POIFS) vs. first block (= block 0)
- The data: first block (POIFS) vs. starting with third block
- The property table: third last block (POIFS) vs. the last block (NPOIFS)
To eventually support real streaming to a new file (without having a
memory-backed datasource), I've decided to keep the order more or less of the
existing implementation, so FAT&BAT entries stay at the same block index and
can be updated in-place - maybe it might be necessary to reserve some blocks in
the beginning of the file for extended BATs, but that is not the focus of this
patch.
*) up till now a byte array was the interface
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