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Posted to c-dev@xerces.apache.org by "Scott Cantor (JIRA)" <xe...@xml.apache.org> on 2018/04/06 00:00:04 UTC
[jira] [Closed] (XERCESC-2145) indefinite memory allocations using
DOMNode::getTextContent()
[ https://issues.apache.org/jira/browse/XERCESC-2145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Scott Cantor closed XERCESC-2145.
---------------------------------
> indefinite memory allocations using DOMNode::getTextContent()
> -------------------------------------------------------------
>
> Key: XERCESC-2145
> URL: https://issues.apache.org/jira/browse/XERCESC-2145
> Project: Xerces-C++
> Issue Type: Bug
> Components: DOM
> Affects Versions: 3.1.2, 3.2.1
> Environment: Windows 10, Visual Studio 2017
> Reporter: Blair Fonville
> Priority: Major
> Attachments: config.xml, main.cpp
>
>
> In a program which reads (parses) an xml file once into a DOMDocument, and then accesses the content of the nodes/elements often, through getTextContent(), the heap memory builds indefinitely.
> For example:
> {code:java}
> #include <xercesc/dom/DOM.hpp>
> XERCES_CPP_NAMESPACE_USE
> int main(int argc, char **argv)
> {
> XMLPlatformUtils::Initialize();
> XMLCh tempStr[100];
> XMLString::transcode("LS", tempStr, 99);
> DOMImplementation *impl = DOMImplementationRegistry::getDOMImplementation(tempStr);
> DOMLSParser *parser = ((DOMImplementationLS*)impl) ->createLSParser( DOMImplementationLS::MODE_SYNCHRONOUS, 0);
> DOMDocument *doc = impl->createDocument(0, 0, 0);
> doc = parser->parseURI("config.xml");
> DOMElement *el = doc->getDocumentElement();
> // Heap blows up here
> while (1) {
> char *cstr = XMLString::transcode(el->getTextContent());
> XMLString::release(&cstr);
> }
> // and/or here
> while (1) {
> XMLCh *xstr = XMLString::replicate(el->getTextContent());
> char *cstr = XMLString::transcode(xstr);
> XMLString::release(&cstr);
> XMLString::release(&xstr);
> }
> }
> {code}
> I realize that the memory is supposed to be freed when the Document is released, but in a program where the Document is populated at startup, and used forever, this is, for all practical purposes, a memory leak.
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