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Code Issues Releases Wiki Activity

Remove QPDF::ObjectChanged

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Also change QPDF::replaceObject and QPDF::swapObjects such that the
QPDFObject assigned to an og in the obj_cache is never replaced; only
QPDFObject::value is updated.
This commit is contained in:
m-holger 2022-08-02 22:57:33 +01:00
parent 431bd666c0
commit 27fae2b55e
3 changed files with 4 additions and 42 deletions
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8
include/qpdf/QPDF.hh
View File

@ -851,12 +851,6 @@ class QPDF
{
return qpdf->resolve(og);
}
static bool
objectChanged(
QPDF* qpdf, QPDFObjGen const& og, std::shared_ptr<QPDFObject>& oph)
{
return qpdf->objectChanged(og, oph);
}
};
friend class Resolver;
@ -1174,7 +1168,6 @@ class QPDF
std::string const& description,
QPDFObjGen const& exp_og,
QPDFObjGen& og);
bool objectChanged(QPDFObjGen const& og, std::shared_ptr<QPDFObject>& oph);
std::shared_ptr<QPDFObject> resolve(QPDFObjGen const& og);
void resolveObjectsInStream(int obj_stream_number);
void stopOnError(std::string const& message);
@ -1729,7 +1722,6 @@ class QPDF
bool in_parse;
bool parsed;
std::set<int> resolved_object_streams;
bool ever_replaced_objects;
// Linearization data
qpdf_offset_t first_xref_item_offset; // actual value from file

34
libqpdf/QPDF.cc
View File

@ -223,7 +223,6 @@ QPDF::Members::Members() :
immediate_copy_from(false),
in_parse(false),
parsed(false),
ever_replaced_objects(false),
first_xref_item_offset(0),
uncompressed_after_compressed(false)
{
@ -1928,28 +1927,6 @@ QPDF::readObjectAtOffset(
return oh;
}
bool
QPDF::objectChanged(QPDFObjGen const& og, std::shared_ptr<QPDFObject>& oph)
{
// See if the object cached at og, if any, is the one passed in.
// QPDFObjectHandle uses this to detect outdated handles to
// replaced or swapped objects. This is a somewhat expensive check
// because it happens with every dereference of a
// QPDFObjectHandle. To reduce the hit somewhat, short-circuit the
// check if we never called a function that replaces an object
// already in cache. It is important for functions that do this to
// set ever_replaced_objects = true.
if (!this->m->ever_replaced_objects) {
return false;
}
auto c = this->m->obj_cache.find(og);
if (c == this->m->obj_cache.end()) {
return true;
}
return (c->second.object.get() != oph.get());
}
std::shared_ptr<QPDFObject>
QPDF::resolve(QPDFObjGen const& og)
{
@ -2207,14 +2184,12 @@ QPDF::replaceObject(QPDFObjGen const& og, QPDFObjectHandle oh)
throw std::logic_error(
"QPDF::replaceObject called with indirect object handle");
}
// Force new object to appear in the cache
resolve(og);
// Replace the object in the object cache
this->m->ever_replaced_objects = true;
this->m->obj_cache[og] =
ObjCache(QPDFObjectHandle::ObjAccessor::getObject(oh), -1, -1);
m->obj_cache[og].object->assign(
QPDFObjectHandle::ObjAccessor::getObject(oh));
}
void
@ -2536,10 +2511,7 @@ QPDF::swapObjects(QPDFObjGen const& og1, QPDFObjGen const& og2)
// cache.
resolve(og1);
resolve(og2);
ObjCache t = this->m->obj_cache[og1];
this->m->ever_replaced_objects = true;
this->m->obj_cache[og1] = this->m->obj_cache[og2];
this->m->obj_cache[og2] = t;
m->obj_cache[og1].object->swapWith(m->obj_cache[og2].object);
}
unsigned long long

4
libqpdf/QPDFObjectHandle.cc
View File

@ -2611,9 +2611,7 @@ QPDFObjectHandle::dereference()
if (!this->initialized) {
return false;
}
if ((this->obj->getTypeCode() == QPDFObject::ot_unresolved) ||
(getObjectID() &&
QPDF::Resolver::objectChanged(this->qpdf, getObjGen(), this->obj))) {
if (this->obj->getTypeCode() == QPDFObject::ot_unresolved) {
this->obj = QPDF::Resolver::resolve(this->qpdf, getObjGen());
}
return true;