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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:
Nick Burch 2011-02-25 22:12:54 +00:00
parent a6e6fcdb96
commit 7e3371bb15
2 changed files with 16 additions and 6 deletions
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21
src/documentation/content/xdocs/poifs/fileformat.xml
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@ -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

1
src/documentation/content/xdocs/status.xml
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@ -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>