diff options
Diffstat (limited to 'libqpdf/QPDF.cc')
| -rw-r--r-- | libqpdf/QPDF.cc | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc index f68efc83..cbc2450c 100644 --- a/libqpdf/QPDF.cc +++ b/libqpdf/QPDF.cc @@ -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) |