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https://issues.apache.org/jira/browse/XERCESC-1988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486810#comment-13486810
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ZORO-BI Christophe-Olivier commented on XERCESC-1988:
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Hello,
I'm using Xerces 2_6_0 to generate XML files from database so I manipulate big
XML files (2MB) by file and I generate thousands of files.
The same DomDocument is appended until a number of records is reached.
After I release DomDocument: pDOMDocument->release();
XMLPlatformUtils::Terminate();
But memory seems not to be completly released and keeps increasing.
I tried to modify expandCapacity function as proposed but I have the same
behaviour.
Has somebody another idea about this bug correction?
Regards.
> memory leak DOMBuffer::expandCapacity
> -------------------------------------
>
> Key: XERCESC-1988
> URL: https://issues.apache.org/jira/browse/XERCESC-1988
> Project: Xerces-C++
> Issue Type: Bug
> Components: DOM
> Affects Versions: 3.1.0
> Environment: all
> Reporter: Reinier vos
>
> in src/xercesc/dom/impl/DOMStringPool.cpp
> DOMBuffer::expandCapacity
> a new buffer of the required size is created while leaving the original
> buffer in memory (comented as a know issue). This posses serious memory
> issues for large strings ( e.g. base64 strings). Creating a text node of 60MB
> requires like 600MB memory.
> I poked a little change in the mentioned function which by no means is a neat
> way but for this application it does the trick (and it describes the issue):
> // Copy over the old stuff
> memcpy(newBuf, fBuffer, fCapacity * sizeof(XMLCh));
> // in DOMDocumentImpl::allocate a standard block
> (header+buffer[kHeapAllocSize]) is used for allocations <=
> kMaxSubAllocationSize
> // Anything bigger is put into its own block (with its own buffer[cap])
> // Check if the buffer we expaned was in its own block, this can be
> deleted safely after a reallocate
> if ( fCapacity * sizeof(XMLCh) > 4096 )
> {
> size_t sizeOfHeader =
> XMLPlatformUtils::alignPointerForNewBlockAllocation(sizeof(void *));
> //retrieve the location of the buffer preceding the one we're
> about to delete
> //set this location in the new header
> *(void **)( (char *)newBuf-sizeOfHeader )=*(void **)( (char
> *)fBuffer-sizeOfHeader );
> delete(((char *)fBuffer-sizeOfHeader));
> }
> // store new stuff
> fBuffer = newBuf;
> fCapacity = newCap;
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