Fix bug #32903 - Correct XBAT chaining explanation in /poifs/fileformat.html
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1074718 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
parent
a6e6fcdb96
commit
7e3371bb15
@ -54,6 +54,11 @@
|
||||
with the extension ".doc", you would actually
|
||||
have a POIFS file system with a document file archived
|
||||
inside of that file system.</p>
|
||||
<p>Note - this document is a good overview and explanation of
|
||||
the file format, but for the very nitty-gritty details,
|
||||
you should refer to
|
||||
<link href="http://msdn.microsoft.com/en-us/library/dd942138%28v=prot.13%29.aspx">[MS-CFB].pdf</link>
|
||||
in the (now public) Microsoft Documentation.</p>
|
||||
</section>
|
||||
<section><title>Document Conventions</title>
|
||||
<p>This document utilizes the numeric types as described by
|
||||
@ -169,18 +174,22 @@ public int getShort (byte[] rec)
|
||||
<em>0x48</em> of the header, there is an int value that
|
||||
specifies how many XBAT blocks there are. The XBAT
|
||||
blocks begin at the specified index into the array of
|
||||
blocks making up the POIFS file system, and continue in
|
||||
sequence for the specified count of XBAT blocks.</p>
|
||||
<p>Each XBAT block contains the indices of up to 128 BAT
|
||||
blocks making up the POIFS file system, and are chained
|
||||
for the specified count of XBAT blocks.</p>
|
||||
<p>Each XBAT block contains the indices of up to 127 BAT
|
||||
blocks, so the document size can be expanded by another
|
||||
8MB for each XBAT block. The BAT blocks indexed by an
|
||||
~8MB for each XBAT block. The BAT blocks indexed by an
|
||||
XBAT block are appended to the end of the list of BAT
|
||||
blocks enumerated in the header block. Thus the BAT
|
||||
blocks enumerated in the header block are BAT blocks 0
|
||||
through 108, the BAT blocks enumerated in the first
|
||||
XBAT block are BAT blocks 109 through 236, the BAT
|
||||
XBAT block are BAT blocks 109 through 235, the BAT
|
||||
blocks enumerated in the second XBAT block are BAT
|
||||
blocks 237 through 364, and so on.</p>
|
||||
blocks 236 through 362, and so on.</p>
|
||||
<p>While a normal BAT block holds 128 entries, each XBAT
|
||||
only references 127 BAT blocks. The last, 128th entry
|
||||
in an XBAT is the offset to the next XBAT block in the
|
||||
chain (or -1 if this is the last XBAT).</p>
|
||||
<p>Through the use of XBAT blocks, the limit on the
|
||||
overall document size is that imposed by the 4-byte
|
||||
block indices; if the indices are unsigned ints, the
|
||||
|
@ -34,6 +34,7 @@
|
||||
|
||||
<changes>
|
||||
<release version="3.8-beta1" date="2010-??-??">
|
||||
<action dev="poi-developers" type="add">32903 - Correct XBAT chaining explanation in /poifs/fileformat.html</action>
|
||||
<action dev="poi-developers" type="add">50829 - Support for getting the tables associated with a XSSFSheet</action>
|
||||
<action dev="poi-developers" type="fix">50299 - More XSSFColor updates for ARGB vs RGB</action>
|
||||
<action dev="poi-developers" type="fix">50581 - Use stax:stax-api instead of org.apache.geronimo.specs:geronimo-stax-api_1.0_spec</action>
|
||||
|
Loading…
Reference in New Issue
Block a user