Hello,
I have a xml file i want to parse. This part works so far.
But my problem is that my xml file has a size of 20 MiB and more. So, if i work
with such a file, then i can see that the allocated memory is not given back to
the system after i call the mentioned free operations xmlFreeDoc(doc) and
xmlFreeParserCtxt(). As far as i just create the doc tree and call the free
operations i could "repair" the memory usage by calling malloc and free the
allocated memory, but as soon as i touch the node contents in any way (see
for-loop) i can't get the memory given back to the system!
And here is my code sample:
xmlParserCtxtPtr ctxt; /* the parser context */
xmlDocPtr doc; /* the resulting document tree */
/* create a parser context */
ctxt = xmlNewParserCtxt();
if (ctxt == NULL) {
fprintf(stderr, "Failed to allocate parser contextn");
return -12;
}
/* parse the file, activating the DTD validation option */
doc = xmlCtxtReadFile(ctxt, nodeCoordinateSource, NULL, 0);
/* check if parsing suceeded */
if (doc == NULL) {
fprintf(stderr, "Failed to parse %sn", nodeCoordinateSource);
} else {
// /* check if validation suceeded */
// if (ctxt->valid == 0)
// fprintf(stderr, "Failed to validate %sn", nodeCoordinateSource);
xmlNode *root = xmlDocGetRootElement(doc);
/* get NodeRecords */
if(root->type == XML_ELEMENT_NODE) {
int found;
xmlAttr *attr;
const xmlChar *match = (const xmlChar *)"dimensions";
for(attr = root->properties, found = 0; attr && !found; attr =
(xmlAttr *)attr->next) {
if(!xmlStrcmp(attr->name, match)) {
dimensions = atoi((const char *)attr->children->content);
found = 1;
}
}
attr = NULL;
root = NULL;
}
/* free up the resulting document */
xmlFreeDoc(doc);
xmlFreeParserCtxt(ctxt);
/* repair memory usage */
ptr = (void *)malloc(1024*1024);
free(ptr);
}
Has anyone an idea how i can fix this?
Regards
Viktor
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