https://issues.apache.org/bugzilla/show_bug.cgi?id=49423
Summary: Data got lost when trying to get EscherContainerRecord
Product: POI
Version: 3.5-FINAL
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: blocker
Priority: P2
Component: POI Overall
AssignedTo: [email protected]
ReportedBy: [email protected]
One of my project need to read images from an excel file (.xls). Besides
reading out the image data, I also need to read out the image position (row and
column) from excel file. During this process, I found there is a bug when I
tried to get EscherContainerRecord.
Here was my plan: I tried to read EscherAggregate from HSSFSheet, and then From
EscherAggreage, I retrieved a list of the EscherRecord. By going though this
list of EscherRecord, and their children, I can get EscherClientAnchorRecord
which contains row number and column number.
But every time if I process a file which has around 50+ or 60+ images, I got an
warning:
WARNING: xxxx bytes remaining but no space left
WARNING: xxxx bytes remaining but no space left
And from the output, I can see there are only about 30+
EscherClientAnchorRecord are retrieved. I believe that EscherClientAnchorRecord
is a child of EscherContainerRecord this this case, and the process of creating
this EscherContainerRecord get some problems. I checked around the source code,
and found the only place where create this warning message is in class :
org/apache/poi/ddf/EscherContainerRecord.java: with following method:
public int fillFields(byte[] data, int pOffset, EscherRecordFactory
recordFactory) {
int bytesRemaining = readHeader(data, pOffset);
int bytesWritten = 8;
int offset = pOffset + 8;
while (bytesRemaining > 0 && offset < data.length) {
EscherRecord child = recordFactory.createRecord(data, offset);
int childBytesWritten = child.fillFields(data, offset,
recordFactory);
bytesWritten += childBytesWritten;
offset += childBytesWritten;
bytesRemaining -= childBytesWritten;
addChildRecord(child);
if (offset >= data.length && bytesRemaining > 0) {
System.out.println("WARNING: " + bytesRemaining + " bytes
remaining but no space left");
}
}
return bytesWritten;
}
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