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An XBAT may not be fully used, and remaining entries may be 0 not POIFSConstants.UNUSED_BLOCK, so avoid trying to process any that we know aren't used. Fixes bug #53810 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1442095 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2013-02-04 12:52:12 +00:00
parent 5801aa36b2
commit dd21676086
1 changed files with 7 additions and 1 deletions
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8
src/java/org/apache/poi/poifs/filesystem/NPOIFSFileSystem.java
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@ -356,6 +356,9 @@ public class NPOIFSFileSystem extends BlockStore
readBAT(fatAt, loopDetector);
}
// Work out how many FAT blocks remain in the XFATs
int remainingFATs = _header.getBATCount() - _header.getBATArray().length;
// Now read the XFAT blocks, and the FATs within them
BATBlock xfat;
int nextAt = _header.getXBATIndex();
@ -367,11 +370,14 @@ public class NPOIFSFileSystem extends BlockStore
nextAt = xfat.getValueAt(bigBlockSize.getXBATEntriesPerBlock());
_xbat_blocks.add(xfat);
for(int j=0; j<bigBlockSize.getXBATEntriesPerBlock(); j++) {
// Process all the (used) FATs from this XFAT
int xbatFATs = Math.min(remainingFATs, bigBlockSize.getXBATEntriesPerBlock());
for(int j=0; j<xbatFATs; j++) {
int fatAt = xfat.getValueAt(j);
if(fatAt == POIFSConstants.UNUSED_BLOCK || fatAt == POIFSConstants.END_OF_CHAIN) break;
readBAT(fatAt, loopDetector);
}
remainingFATs -= xbatFATs;
}
// We're now able to load steams