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Revert getOwningQPDF, and add getQPDF that returns a reference

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This commit is contained in:
Jay Berkenbilt 2022-09-07 11:29:17 -04:00
parent bac559559e
commit 0132261ee0
9 changed files with 87 additions and 69 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2022-09-07 Jay Berkenbilt <ejb@ql.org>
* Add QPDFObjectHandle::getQPDF(), which returns a reference, as
an alternative to QPDFObjectHandle::getOwningQPDF().
2022-09-06 Jay Berkenbilt <ejb@ql.org>
* For all bounding box methods in QPDFPageObjectHelper other than

54
include/qpdf/QPDFObjectHandle.hh
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@ -661,14 +661,17 @@ class QPDFObjectHandle
static QPDFObjectHandle newReserved(QPDF* qpdf);
// Provide an owning qpdf and object description. The library does
// this automatically with objects that are read from the
// input PDF and with objects that are created programmatically
// and inserted into the QPDF by adding them to an array or a
// dictionary or creating a new indirect object. Most end user
// this automatically with objects that are read from the input
// PDF and with objects that are created programmatically and
// inserted into the QPDF as a new indirect object. Most end user
// code will not need to call this. If an object has an owning
// qpdf and object description, it enables qpdf to give warnings
// with proper context in some cases where it would otherwise
// raise exceptions.
// raise exceptions. It is okay to add objects without an
// owning_qpdf to objects that have one, but it is an error to
// have a QPDF contain objects with owning_qpdf set to something
// else. To add objects from another qpdf, use copyForeignObject
// instead.
QPDF_DLL
void setObjectDescription(
QPDF* owning_qpdf, std::string const& object_description);
@ -978,23 +981,34 @@ class QPDFObjectHandle
int& min_suffix,
std::set<std::string>* resource_names = nullptr);
// If this is an indirect object, return a pointer to the QPDF
// object that owns an indirect object. Direct objects are not
// owned by a QPDF. Usage notes:
// A QPDFObjectHandle has an owning QPDF if it is associated with
// ("owned by") a specific QPDF object. Indirect objects always
// have an owning QPDF. Direct objects that are read from the
// input source will also have an owning QPDF. Programmatically
// created objects will only have one if setObjectDescription was
// called.
//
// * When allow_nullptr is true, this method will return a null
// pointer if the object is not owned by a QPDF. Otherwise, an
// exception is thrown.
//
// * You should not retain the value returned by this method for
// longer than the lifetime of the owning QPDF object. If you
// retain a QPDFObjectHandle longer than the owning QPDF, when
// the QPDF object is destroyed, the QPDFObjectHandle will turn
// into a direct "null" object, and getOwningQPDF() called on it
// at that time will return a null pointer.
// When the QPDF object that owns an object is destroyed, the
// object is changed into a null, and its owner is cleared.
// Therefore you should not retain the value of an owning QPDF
// beyond the life of the QPDF. If in doubt, ask for it each time
// you need it.
// getOwningQPDF returns a pointer to the owning QPDF is the
// object has one. Otherwise, it returns a null pointer. Use this
// when you are able to handle the case of an object that doesn't
// have an owning QPDF.
QPDF_DLL
QPDF* getOwningQPDF(
bool allow_nullptr = true, std::string const& error_msg = "") const;
QPDF* getOwningQPDF() const;
// getQPDF, new in qpdf 11, returns a reference owning QPDF. If
// there is none, it throws a runtime_error. Use this when you
// know the object has to have an owning QPDF, such as when it's a
// known indirect object. Since streams are always indirect
// objects, this method can be used safely for streams. If
// error_msg is specified, it will be used at the contents of the
// runtime_error if there is now owner.
QPDF_DLL
QPDF& getQPDF(std::string const& error_msg = "") const;
// Create a shallow copy of an object as a direct object, but do not
// traverse across indirect object boundaries. That means that,

16
libqpdf/QPDF.cc
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@ -2299,14 +2299,14 @@ QPDF::copyForeignObject(QPDFObjectHandle foreign)
throw std::logic_error(
"QPDF::copyForeign called with direct object handle");
}
QPDF* other = foreign.getOwningQPDF(false);
if (other == this) {
QPDF& other = foreign.getQPDF();
if (&other == this) {
QTC::TC("qpdf", "QPDF copyForeign not foreign");
throw std::logic_error(
"QPDF::copyForeign called with object from this QPDF");
}
ObjCopier& obj_copier = this->m->object_copiers[other->m->unique_id];
ObjCopier& obj_copier = this->m->object_copiers[other.m->unique_id];
if (!obj_copier.visiting.empty()) {
throw std::logic_error("obj_copier.visiting is not empty"
" at the beginning of copyForeignObject");
@ -2490,8 +2490,8 @@ QPDF::copyStreamData(QPDFObjectHandle result, QPDFObjectHandle foreign)
// Copy information from the foreign stream so we can pipe its
// data later without keeping the original QPDF object around.
QPDF* foreign_stream_qpdf = foreign.getOwningQPDF(
false, "unable to retrieve owning qpdf from foreign stream");
QPDF& foreign_stream_qpdf =
foreign.getQPDF("unable to retrieve owning qpdf from foreign stream");
auto stream = QPDFObjectHandle::ObjAccessor::asStream(foreign);
if (stream == nullptr) {
@ -2499,7 +2499,7 @@ QPDF::copyStreamData(QPDFObjectHandle result, QPDFObjectHandle foreign)
" stream object from foreign stream");
}
std::shared_ptr<Buffer> stream_buffer = stream->getStreamDataBuffer();
if ((foreign_stream_qpdf->m->immediate_copy_from) &&
if ((foreign_stream_qpdf.m->immediate_copy_from) &&
(stream_buffer == nullptr)) {
// Pull the stream data into a buffer before attempting
// the copy operation. Do it on the source stream so that
@ -2529,8 +2529,8 @@ QPDF::copyStreamData(QPDFObjectHandle result, QPDFObjectHandle foreign)
dict.getKey("/DecodeParms"));
} else {
auto foreign_stream_data = std::make_shared<ForeignStreamData>(
foreign_stream_qpdf->m->encp,
foreign_stream_qpdf->m->file,
foreign_stream_qpdf.m->encp,
foreign_stream_qpdf.m->file,
foreign.getObjGen(),
stream->getOffset(),
stream->getLength(),

8
libqpdf/QPDFFormFieldObjectHelper.cc
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@ -362,12 +362,10 @@ QPDFFormFieldObjectHelper::setV(QPDFObjectHandle value, bool need_appearances)
setFieldAttribute("/V", value);
}
if (need_appearances) {
QPDF* qpdf = this->oh.getOwningQPDF(
false,
QPDF& qpdf = this->oh.getQPDF(
"QPDFFormFieldObjectHelper::setV called with need_appearances = "
"true on an object that is not associated with an owning QPDF");
QPDFAcroFormDocumentHelper(*qpdf).setNeedAppearances(true);
QPDFAcroFormDocumentHelper(qpdf).setNeedAppearances(true);
}
}
@ -881,7 +879,7 @@ QPDFFormFieldObjectHelper::generateTextAppearance(
if (found_font_in_dr && resources.isDictionary()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper get font from /DR");
if (resources.isIndirect()) {
resources = resources.getOwningQPDF(false)->makeIndirectObject(
resources = resources.getQPDF().makeIndirectObject(
resources.shallowCopy());
AS.getDict().replaceKey("/Resources", resources);
}

6
libqpdf/QPDFJob.cc
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@ -2194,8 +2194,8 @@ QPDFJob::doUnderOverlayForPage(
std::map<unsigned long long, std::shared_ptr<QPDFAcroFormDocumentHelper>>
afdh;
auto make_afdh = [&](QPDFPageObjectHelper& ph) {
QPDF* q = ph.getObjectHandle().getOwningQPDF(false);
return get_afdh_for_qpdf(afdh, q);
QPDF& q = ph.getObjectHandle().getQPDF();
return get_afdh_for_qpdf(afdh, &q);
};
auto dest_afdh = make_afdh(dest_page);
@ -2635,7 +2635,7 @@ static QPDFObjectHandle
added_page(QPDF& pdf, QPDFObjectHandle page)
{
QPDFObjectHandle result = page;
if (page.getOwningQPDF(false) != &pdf) {
if (&page.getQPDF() != &pdf) {
// Calling copyForeignObject on an object we already copied
// will give us the already existing copy.
result = pdf.copyForeignObject(page);

19
libqpdf/QPDFObjectHandle.cc
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@ -1668,11 +1668,10 @@ QPDFObjectHandle::coalesceContentStreams()
// incorrect way. However, it can happen in a PDF file whose
// page structure is direct, which is against spec but still
// possible to hand construct, as in fuzz issue 27393.
QPDF* qpdf = getOwningQPDF(
false,
QPDF& qpdf = getQPDF(
"coalesceContentStreams called on object with no associated PDF file");
QPDFObjectHandle new_contents = newStream(qpdf);
QPDFObjectHandle new_contents = newStream(&qpdf);
this->replaceKey("/Contents", new_contents);
auto provider = std::shared_ptr<StreamDataProvider>(
@ -2775,16 +2774,20 @@ QPDFObjectHandle::getObjGen() const
// Indirect object accessors
QPDF*
QPDFObjectHandle::getOwningQPDF(
bool allow_nullptr, std::string const& error_msg) const
QPDFObjectHandle::getOwningQPDF() const
{
return isInitialized() ? this->obj->getQPDF() : nullptr;
}
QPDF&
QPDFObjectHandle::getQPDF(std::string const& error_msg) const
{
// Will be null for direct objects
auto result = isInitialized() ? this->obj->getQPDF() : nullptr;
if (!allow_nullptr && (result == nullptr)) {
if (result == nullptr) {
throw std::runtime_error(
error_msg == "" ? "attempt to use a null qpdf object" : error_msg);
}
return result;
return *result;
}
void

41
libqpdf/QPDFPageObjectHelper.cc
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@ -477,8 +477,7 @@ QPDFPageObjectHelper::externalizeInlineImages(size_t min_size, bool shallow)
this->oh.replaceKey(
"/Contents",
QPDFObjectHandle::newStream(
this->oh.getOwningQPDF(false),
b.getBufferSharedPointer()));
&this->oh.getQPDF(), b.getBufferSharedPointer()));
}
}
} else {
@ -729,12 +728,10 @@ QPDFPageObjectHelper::removeUnreferencedResources()
QPDFPageObjectHelper
QPDFPageObjectHelper::shallowCopyPage()
{
QPDF* qpdf = this->oh.getOwningQPDF(
false,
QPDF& qpdf = this->oh.getQPDF(
"QPDFPageObjectHelper::shallowCopyPage called with a direct object");
QPDFObjectHandle new_page = this->oh.shallowCopy();
return QPDFPageObjectHelper(qpdf->makeIndirectObject(new_page));
return QPDFPageObjectHelper(qpdf.makeIndirectObject(new_page));
}
QPDFObjectHandle::Matrix
@ -788,11 +785,10 @@ QPDFPageObjectHelper::getMatrixForTransformations(bool invert)
QPDFObjectHandle
QPDFPageObjectHelper::getFormXObjectForPage(bool handle_transformations)
{
QPDF* qpdf = this->oh.getOwningQPDF(
false,
QPDF& qpdf = this->oh.getQPDF(
"QPDFPageObjectHelper::getFormXObjectForPage called with a direct "
"object");
QPDFObjectHandle result = QPDFObjectHandle::newStream(qpdf);
QPDFObjectHandle result = QPDFObjectHandle::newStream(&qpdf);
QPDFObjectHandle newdict = result.getDict();
newdict.replaceKey("/Type", QPDFObjectHandle::newName("/XObject"));
newdict.replaceKey("/Subtype", QPDFObjectHandle::newName("/Form"));
@ -961,10 +957,8 @@ QPDFPageObjectHelper::placeFormXObject(
void
QPDFPageObjectHelper::flattenRotation(QPDFAcroFormDocumentHelper* afdh)
{
QPDF* qpdf = this->oh.getOwningQPDF(
false,
QPDF& qpdf = this->oh.getQPDF(
"QPDFPageObjectHelper::flattenRotation called with a direct object");
auto rotate_oh = this->oh.getKey("/Rotate");
int rotate = 0;
if (rotate_oh.isInteger()) {
@ -1067,8 +1061,9 @@ QPDFPageObjectHelper::flattenRotation(QPDFAcroFormDocumentHelper* afdh)
break;
}
std::string cm_str = std::string("q\n") + cm.unparse() + " cm\n";
this->oh.addPageContents(QPDFObjectHandle::newStream(qpdf, cm_str), true);
this->oh.addPageContents(QPDFObjectHandle::newStream(qpdf, "\nQ\n"), false);
this->oh.addPageContents(QPDFObjectHandle::newStream(&qpdf, cm_str), true);
this->oh.addPageContents(
QPDFObjectHandle::newStream(&qpdf, "\nQ\n"), false);
this->oh.removeKey("/Rotate");
QPDFObjectHandle rotate_obj = getAttribute("/Rotate", false);
if (!rotate_obj.isNull()) {
@ -1083,7 +1078,7 @@ QPDFPageObjectHelper::flattenRotation(QPDFAcroFormDocumentHelper* afdh)
std::set<QPDFObjGen> old_fields;
std::shared_ptr<QPDFAcroFormDocumentHelper> afdhph;
if (!afdh) {
afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(*qpdf);
afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(qpdf);
afdh = afdhph.get();
}
afdh->transformAnnotations(
@ -1108,11 +1103,9 @@ QPDFPageObjectHelper::copyAnnotations(
return;
}
QPDF* from_qpdf = from_page.getObjectHandle().getOwningQPDF(
false,
QPDF& from_qpdf = from_page.getObjectHandle().getQPDF(
"QPDFPageObjectHelper::copyAnnotations: from page is a direct object");
QPDF* this_qpdf = this->oh.getOwningQPDF(
false,
QPDF& this_qpdf = this->oh.getQPDF(
"QPDFPageObjectHelper::copyAnnotations: this page is a direct object");
std::vector<QPDFObjectHandle> new_annots;
@ -1121,19 +1114,19 @@ QPDFPageObjectHelper::copyAnnotations(
std::shared_ptr<QPDFAcroFormDocumentHelper> afdhph;
std::shared_ptr<QPDFAcroFormDocumentHelper> from_afdhph;
if (!afdh) {
afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(*this_qpdf);
afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(this_qpdf);
afdh = afdhph.get();
}
if (this_qpdf == from_qpdf) {
if (&this_qpdf == &from_qpdf) {
from_afdh = afdh;
} else if (from_afdh) {
if (from_afdh->getQPDF().getUniqueId() != from_qpdf->getUniqueId()) {
if (from_afdh->getQPDF().getUniqueId() != from_qpdf.getUniqueId()) {
throw std::logic_error(
"QPDFAcroFormDocumentHelper::copyAnnotations: from_afdh"
" is not from the same QPDF as from_page");
}
} else {
from_afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(*from_qpdf);
from_afdhph = std::make_shared<QPDFAcroFormDocumentHelper>(from_qpdf);
from_afdh = from_afdhph.get();
}
@ -1143,7 +1136,7 @@ QPDFPageObjectHelper::copyAnnotations(
new_fields,
old_fields,
cm,
from_qpdf,
&from_qpdf,
from_afdh);
afdh->addAndRenameFormFields(new_fields);
auto annots = this->oh.getKey("/Annots");

2
libqpdf/QPDF_pages.cc
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@ -233,7 +233,7 @@ QPDF::insertPage(QPDFObjectHandle newpage, int pos)
newpage = makeIndirectObject(newpage);
} else if (newpage.getOwningQPDF() != this) {
QTC::TC("qpdf", "QPDF insert foreign page");
newpage.getOwningQPDF(false)->pushInheritedAttributesToPage();
newpage.getQPDF().pushInheritedAttributesToPage();
newpage = copyForeignObject(newpage);
} else {
QTC::TC("qpdf", "QPDF insert indirect page");

5
manual/release-notes.rst
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@ -208,6 +208,11 @@ For a detailed list of changes, please see the file
generally not happen for correct code, but at least the
situation is detectible now.
- The method ``QPDFObjectHandle::getQPDF`` returns a ``QPDF&``
(rather than a ``QPDF*``) and is an alternative to
``QPDFObjectHandle::getOwningQPDF`` for when the object is known
to have an owning ``QPDF``.
- It is now possible to test ``QPDFObjectHandle`` equality with
``==`` and ``!=``. Two ``QPDFObjectHandle`` objects are equal if
they point to the same underlying object, meaning changes to one