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comment on memory leak fix

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git-svn-id: svn+q:///qpdf/trunk@979 71b93d88-0707-0410-a8cf-f5a4172ac649
This commit is contained in:
Jay Berkenbilt 2010-06-06 18:03:21 +00:00
parent 21753001b7
commit 6755a86734
2 changed files with 18 additions and 0 deletions
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14
libqpdf/QPDF.cc
View File

@ -277,6 +277,20 @@ QPDF::QPDF() :
QPDF::~QPDF()
{
// If two objects are mutually referential (through each object
// having an array or dictionary that contains an indirect
// reference to the other), the circular references in the
// PointerHolder objects will prevent the objects from being
// deleted. Walk through all objects in the object cache, which
// is those objects that we read from the file, and break all
// resolved references. At this point, obviously no one is still
// using the QPDF object, but we'll explicitly clear the xref
// table anyway just to prevent any possibility of resolve()
// succeeding. Note that we can't break references like this at
// any time when the QPDF object is active. If we do, the next
// reference will reread the object from the file, which would
// have the effect of undoing any modifications that may have been
// made to any of the objects.
this->xref_table.clear();
for (std::map<ObjGen, ObjCache>::iterator iter = this->obj_cache.begin();
iter != obj_cache.end(); ++iter)

4
libqpdf/QPDFObjectHandle.cc
View File

@ -44,6 +44,10 @@ QPDFObjectHandle::QPDFObjectHandle(QPDFObject* data) :
void
QPDFObjectHandle::releaseResolved()
{
// Recursively break any resolved references to indirect objects.
// Do not cross over indirect object boundaries to avoid an
// infinite loop. This method may only be called during final
// destruction. See comments in QPDF::~QPDF().
if (isIndirect())
{
if (this->obj.getPointer())