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https://github.com/qpdf/qpdf.git
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1348 lines
46 KiB
C++
1348 lines
46 KiB
C++
#include <qpdf/QPDFAcroFormDocumentHelper.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/QPDFPageDocumentHelper.hh>
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#include <qpdf/ResourceFinder.hh>
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#include <qpdf/Pl_Buffer.hh>
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#include <qpdf/QUtil.hh>
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QPDFAcroFormDocumentHelper::Members::~Members()
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{
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}
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QPDFAcroFormDocumentHelper::Members::Members() :
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cache_valid(false)
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{
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}
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QPDFAcroFormDocumentHelper::QPDFAcroFormDocumentHelper(QPDF& qpdf) :
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QPDFDocumentHelper(qpdf),
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m(new Members())
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{
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// We have to analyze up front. Otherwise, when we are adding
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// annotations and fields, we are in a temporarily unstable
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// configuration where some widget annotations are not reachable.
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analyze();
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}
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void
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QPDFAcroFormDocumentHelper::invalidateCache()
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{
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this->m->cache_valid = false;
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this->m->field_to_annotations.clear();
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this->m->annotation_to_field.clear();
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}
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bool
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QPDFAcroFormDocumentHelper::hasAcroForm()
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{
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return this->qpdf.getRoot().hasKey("/AcroForm");
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}
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QPDFObjectHandle
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QPDFAcroFormDocumentHelper::getOrCreateAcroForm()
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{
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auto acroform = this->qpdf.getRoot().getKey("/AcroForm");
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if (! acroform.isDictionary())
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{
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acroform = this->qpdf.makeIndirectObject(
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QPDFObjectHandle::newDictionary());
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this->qpdf.getRoot().replaceKey("/AcroForm", acroform);
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}
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return acroform;
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}
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void
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QPDFAcroFormDocumentHelper::addFormField(QPDFFormFieldObjectHelper ff)
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{
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auto acroform = getOrCreateAcroForm();
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auto fields = acroform.getKey("/Fields");
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if (! fields.isArray())
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{
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fields = QPDFObjectHandle::newArray();
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acroform.replaceKey("/Fields", fields);
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}
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fields.appendItem(ff.getObjectHandle());
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std::set<QPDFObjGen> visited;
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traverseField(
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ff.getObjectHandle(), QPDFObjectHandle::newNull(), 0, visited);
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}
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void
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QPDFAcroFormDocumentHelper::addAndRenameFormFields(
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std::vector<QPDFObjectHandle> fields)
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{
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analyze();
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std::map<std::string, std::string> renames;
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std::list<QPDFObjectHandle> queue;
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queue.insert(queue.begin(), fields.begin(), fields.end());
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std::set<QPDFObjGen> seen;
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while (! queue.empty())
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{
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QPDFObjectHandle obj = queue.front();
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queue.pop_front();
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auto og = obj.getObjGen();
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if (seen.count(og))
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{
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// loop
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continue;
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}
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seen.insert(og);
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auto kids = obj.getKey("/Kids");
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if (kids.isArray())
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{
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for (auto kid: kids.aitems())
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{
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queue.push_back(kid);
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}
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}
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if (obj.hasKey("/T"))
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{
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// Find something we can append to the partial name that
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// makes the fully qualified name unique. When we find
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// something, reuse the same suffix for all fields in this
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// group with the same name. We can only change the name
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// of fields that have /T, and this field's /T is always
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// at the end of the fully qualified name, appending to /T
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// has the effect of appending the same thing to the fully
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// qualified name.
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std::string old_name =
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QPDFFormFieldObjectHelper(obj).getFullyQualifiedName();
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if (renames.count(old_name) == 0)
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{
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std::string new_name = old_name;
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int suffix = 0;
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std::string append;
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while (! getFieldsWithQualifiedName(new_name).empty())
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{
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++suffix;
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append = "+" + QUtil::int_to_string(suffix);
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new_name = old_name + append;
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}
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renames[old_name] = append;
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}
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std::string append = renames[old_name];
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if (! append.empty())
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{
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obj.replaceKey(
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"/T", QPDFObjectHandle::newUnicodeString(
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obj.getKey("/T").getUTF8Value() + append));
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}
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}
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}
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for (auto i: fields)
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{
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addFormField(i);
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}
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}
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void
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QPDFAcroFormDocumentHelper::removeFormFields(
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std::set<QPDFObjGen> const& to_remove)
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{
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auto acroform = this->qpdf.getRoot().getKey("/AcroForm");
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if (! acroform.isDictionary())
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{
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return;
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}
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auto fields = acroform.getKey("/Fields");
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if (! fields.isArray())
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{
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return;
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}
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for (auto const& og: to_remove)
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{
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auto annotations = this->m->field_to_annotations.find(og);
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if (annotations != this->m->field_to_annotations.end())
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{
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for (auto aoh: annotations->second)
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{
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this->m->annotation_to_field.erase(
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aoh.getObjectHandle().getObjGen());
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}
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this->m->field_to_annotations.erase(og);
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}
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auto name = this->m->field_to_name.find(og);
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if (name != this->m->field_to_name.end())
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{
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this->m->name_to_fields[name->second].erase(og);
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if (this->m->name_to_fields[name->second].empty())
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{
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this->m->name_to_fields.erase(name->second);
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}
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this->m->field_to_name.erase(og);
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}
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}
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int i = 0;
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while (i < fields.getArrayNItems())
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{
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auto field = fields.getArrayItem(i);
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if (to_remove.count(field.getObjGen()))
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{
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fields.eraseItem(i);
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}
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else
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{
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++i;
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}
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}
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}
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void
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QPDFAcroFormDocumentHelper::setFormFieldName(
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QPDFFormFieldObjectHelper ff, std::string const& name)
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{
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ff.setFieldAttribute("/T", name);
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std::set<QPDFObjGen> visited;
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auto ff_oh = ff.getObjectHandle();
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traverseField(ff_oh, ff_oh.getKey("/Parent"), 0, visited);
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}
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std::vector<QPDFFormFieldObjectHelper>
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QPDFAcroFormDocumentHelper::getFormFields()
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{
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analyze();
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std::vector<QPDFFormFieldObjectHelper> result;
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for (std::map<QPDFObjGen,
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std::vector<QPDFAnnotationObjectHelper> >::iterator iter =
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this->m->field_to_annotations.begin();
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iter != this->m->field_to_annotations.end(); ++iter)
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{
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result.push_back(this->qpdf.getObjectByObjGen((*iter).first));
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}
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return result;
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}
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std::set<QPDFObjGen>
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QPDFAcroFormDocumentHelper::getFieldsWithQualifiedName(
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std::string const& name)
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{
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analyze();
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// Keep from creating an empty entry
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std::set<QPDFObjGen> result;
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auto iter = this->m->name_to_fields.find(name);
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if (iter != this->m->name_to_fields.end())
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{
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result = iter->second;
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}
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return result;
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}
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std::vector<QPDFAnnotationObjectHelper>
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QPDFAcroFormDocumentHelper::getAnnotationsForField(QPDFFormFieldObjectHelper h)
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{
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analyze();
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std::vector<QPDFAnnotationObjectHelper> result;
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QPDFObjGen og(h.getObjectHandle().getObjGen());
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if (this->m->field_to_annotations.count(og))
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{
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result = this->m->field_to_annotations[og];
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}
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return result;
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}
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std::vector<QPDFAnnotationObjectHelper>
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QPDFAcroFormDocumentHelper::getWidgetAnnotationsForPage(QPDFPageObjectHelper h)
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{
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return h.getAnnotations("/Widget");
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}
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std::vector<QPDFFormFieldObjectHelper>
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QPDFAcroFormDocumentHelper::getFormFieldsForPage(QPDFPageObjectHelper ph)
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{
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analyze();
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std::set<QPDFObjGen> added;
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std::vector<QPDFFormFieldObjectHelper> result;
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auto widget_annotations = getWidgetAnnotationsForPage(ph);
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for (auto annot: widget_annotations)
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{
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auto field = getFieldForAnnotation(annot);
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field = field.getTopLevelField();
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auto og = field.getObjectHandle().getObjGen();
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if (! added.count(og))
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{
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added.insert(og);
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if (field.getObjectHandle().isDictionary())
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{
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result.push_back(field);
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}
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}
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}
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return result;
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}
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QPDFFormFieldObjectHelper
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QPDFAcroFormDocumentHelper::getFieldForAnnotation(QPDFAnnotationObjectHelper h)
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{
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QPDFObjectHandle oh = h.getObjectHandle();
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QPDFFormFieldObjectHelper result(QPDFObjectHandle::newNull());
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if (! oh.isDictionaryOfType("", "/Widget"))
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{
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return result;
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}
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analyze();
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QPDFObjGen og(oh.getObjGen());
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if (this->m->annotation_to_field.count(og))
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{
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result = this->m->annotation_to_field[og];
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}
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return result;
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}
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void
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QPDFAcroFormDocumentHelper::analyze()
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{
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if (this->m->cache_valid)
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{
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return;
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}
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this->m->cache_valid = true;
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QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
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if (! (acroform.isDictionary() && acroform.hasKey("/Fields")))
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{
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return;
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}
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QPDFObjectHandle fields = acroform.getKey("/Fields");
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if (! fields.isArray())
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{
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper fields not array");
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acroform.warnIfPossible(
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"/Fields key of /AcroForm dictionary is not an array; ignoring");
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fields = QPDFObjectHandle::newArray();
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}
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// Traverse /AcroForm to find annotations and map them
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// bidirectionally to fields.
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std::set<QPDFObjGen> visited;
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int nfields = fields.getArrayNItems();
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QPDFObjectHandle null(QPDFObjectHandle::newNull());
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for (int i = 0; i < nfields; ++i)
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{
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traverseField(fields.getArrayItem(i), null, 0, visited);
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}
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// All Widget annotations should have been encountered by
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// traversing /AcroForm, but in case any weren't, find them by
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// walking through pages, and treat any widget annotation that is
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// not associated with a field as its own field. This just ensures
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// that requesting the field for any annotation we find through a
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// page's /Annots list will have some associated field. Note that
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// a file that contains this kind of error will probably not
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// actually work with most viewers.
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QPDFPageDocumentHelper dh(this->qpdf);
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std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();
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for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
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iter != pages.end(); ++iter)
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{
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QPDFPageObjectHelper ph(*iter);
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std::vector<QPDFAnnotationObjectHelper> annots =
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getWidgetAnnotationsForPage(ph);
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for (std::vector<QPDFAnnotationObjectHelper>::iterator i2 =
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annots.begin();
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i2 != annots.end(); ++i2)
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{
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QPDFObjectHandle annot((*i2).getObjectHandle());
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QPDFObjGen og(annot.getObjGen());
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if (this->m->annotation_to_field.count(og) == 0)
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{
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper orphaned widget");
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// This is not supposed to happen, but it's easy
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// enough for us to handle this case. Treat the
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// annotation as its own field. This could allow qpdf
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// to sensibly handle a case such as a PDF creator
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// adding a self-contained annotation (merged with the
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// field dictionary) to the page's /Annots array and
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// forgetting to also put it in /AcroForm.
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annot.warnIfPossible(
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"this widget annotation is not"
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" reachable from /AcroForm in the document catalog");
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this->m->annotation_to_field[og] =
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QPDFFormFieldObjectHelper(annot);
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this->m->field_to_annotations[og].push_back(
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QPDFAnnotationObjectHelper(annot));
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}
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}
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}
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}
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void
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QPDFAcroFormDocumentHelper::traverseField(
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QPDFObjectHandle field, QPDFObjectHandle parent, int depth,
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std::set<QPDFObjGen>& visited)
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{
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if (depth > 100)
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{
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// Arbitrarily cut off recursion at a fixed depth to avoid
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// specially crafted files that could cause stack overflow.
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return;
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}
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if (! field.isIndirect())
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{
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper direct field");
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field.warnIfPossible(
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"encountered a direct object as a field or annotation while"
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" traversing /AcroForm; ignoring field or annotation");
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return;
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}
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if (! field.isDictionary())
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{
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper non-dictionary field");
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field.warnIfPossible(
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"encountered a non-dictionary as a field or annotation while"
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" traversing /AcroForm; ignoring field or annotation");
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return;
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}
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QPDFObjGen og(field.getObjGen());
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if (visited.count(og) != 0)
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{
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper loop");
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field.warnIfPossible("loop detected while traversing /AcroForm");
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return;
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}
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visited.insert(og);
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// A dictionary encountered while traversing the /AcroForm field
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// may be a form field, an annotation, or the merger of the two. A
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// field that has no fields below it is a terminal. If a terminal
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// field looks like an annotation, it is an annotation because
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// annotation dictionary fields can be merged with terminal field
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// dictionaries. Otherwise, the annotation fields might be there
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// to be inherited by annotations below it.
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bool is_annotation = false;
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bool is_field = (0 == depth);
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QPDFObjectHandle kids = field.getKey("/Kids");
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if (kids.isArray())
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{
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is_field = true;
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int nkids = kids.getArrayNItems();
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for (int k = 0; k < nkids; ++k)
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{
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traverseField(kids.getArrayItem(k), field, 1 + depth, visited);
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}
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}
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else
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{
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if (field.hasKey("/Parent"))
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{
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is_field = true;
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}
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if (field.hasKey("/Subtype") ||
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field.hasKey("/Rect") ||
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field.hasKey("/AP"))
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{
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is_annotation = true;
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}
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}
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper field found",
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(depth == 0) ? 0 : 1);
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QTC::TC("qpdf", "QPDFAcroFormDocumentHelper annotation found",
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(is_field ? 0 : 1));
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if (is_annotation)
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{
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QPDFObjectHandle our_field = (is_field ? field : parent);
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this->m->field_to_annotations[our_field.getObjGen()].push_back(
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QPDFAnnotationObjectHelper(field));
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this->m->annotation_to_field[og] =
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QPDFFormFieldObjectHelper(our_field);
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}
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if (is_field && (field.hasKey("/T")))
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{
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QPDFFormFieldObjectHelper foh(field);
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auto f_og = field.getObjGen();
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std::string name = foh.getFullyQualifiedName();
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auto old = this->m->field_to_name.find(f_og);
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if (old != this->m->field_to_name.end())
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{
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// We might be updating after a name change, so remove any
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// old information
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std::string old_name = old->second;
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this->m->name_to_fields[old_name].erase(f_og);
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}
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this->m->field_to_name[f_og] = name;
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this->m->name_to_fields[name].insert(f_og);
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}
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}
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bool
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QPDFAcroFormDocumentHelper::getNeedAppearances()
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{
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bool result = false;
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QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
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if (acroform.isDictionary() &&
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acroform.getKey("/NeedAppearances").isBool())
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{
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result = acroform.getKey("/NeedAppearances").getBoolValue();
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}
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return result;
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}
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void
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QPDFAcroFormDocumentHelper::setNeedAppearances(bool val)
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{
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QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
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if (! acroform.isDictionary())
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{
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this->qpdf.getRoot().warnIfPossible(
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"ignoring call to QPDFAcroFormDocumentHelper::setNeedAppearances"
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" on a file that lacks an /AcroForm dictionary");
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return;
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}
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if (val)
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{
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acroform.replaceKey("/NeedAppearances",
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QPDFObjectHandle::newBool(true));
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}
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else
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{
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acroform.removeKey("/NeedAppearances");
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}
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}
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void
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QPDFAcroFormDocumentHelper::generateAppearancesIfNeeded()
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{
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if (! getNeedAppearances())
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{
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return;
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}
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|
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QPDFPageDocumentHelper pdh(this->qpdf);
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std::vector<QPDFPageObjectHelper> pages = pdh.getAllPages();
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for (std::vector<QPDFPageObjectHelper>::iterator page_iter =
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pages.begin();
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page_iter != pages.end(); ++page_iter)
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{
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std::vector<QPDFAnnotationObjectHelper> annotations =
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getWidgetAnnotationsForPage(*page_iter);
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for (std::vector<QPDFAnnotationObjectHelper>::iterator annot_iter =
|
|
annotations.begin();
|
|
annot_iter != annotations.end(); ++annot_iter)
|
|
{
|
|
QPDFAnnotationObjectHelper& aoh = *annot_iter;
|
|
QPDFFormFieldObjectHelper ffh =
|
|
getFieldForAnnotation(aoh);
|
|
if (ffh.getFieldType() == "/Btn")
|
|
{
|
|
// Rather than generating appearances for button
|
|
// fields, rely on what's already there. Just make
|
|
// sure /AS is consistent with /V, which we can do by
|
|
// resetting the value of the field back to itself.
|
|
// This code is referenced in a comment in
|
|
// QPDFFormFieldObjectHelper::generateAppearance.
|
|
if (ffh.isRadioButton() || ffh.isCheckbox())
|
|
{
|
|
ffh.setV(ffh.getValue());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ffh.generateAppearance(aoh);
|
|
}
|
|
}
|
|
}
|
|
setNeedAppearances(false);
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::adjustInheritedFields(
|
|
QPDFObjectHandle obj,
|
|
bool override_da, std::string const& from_default_da,
|
|
bool override_q, int from_default_q)
|
|
{
|
|
// Override /Q or /DA if needed. If this object has a field type,
|
|
// directly or inherited, it is a field and not just an
|
|
// annotation. In that case, we need to override if we are getting
|
|
// a value from the document that is different from the value we
|
|
// would have gotten from the old document. We must take care not
|
|
// to override an explicit value. It's possible that /FT may be
|
|
// inherited by lower fields that may explicitly set /DA or /Q or
|
|
// that this is a field whose type does not require /DA or /Q and
|
|
// we may be put a value on the field that is unused. This is
|
|
// harmless, so it's not worth trying to work around.
|
|
|
|
auto has_explicit = [](QPDFFormFieldObjectHelper& field,
|
|
std::string const& key) {
|
|
if (field.getObjectHandle().hasKey(key))
|
|
{
|
|
return true;
|
|
}
|
|
auto oh = field.getInheritableFieldValue(key);
|
|
if (! oh.isNull())
|
|
{
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
if (override_da || override_q)
|
|
{
|
|
QPDFFormFieldObjectHelper cur_field(obj);
|
|
if (override_da && (! has_explicit(cur_field, "/DA")))
|
|
{
|
|
std::string da = cur_field.getDefaultAppearance();
|
|
if (da != from_default_da)
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper override da");
|
|
obj.replaceKey(
|
|
"/DA",
|
|
QPDFObjectHandle::newUnicodeString(
|
|
from_default_da));
|
|
}
|
|
}
|
|
if (override_q && (! has_explicit(cur_field, "/Q")))
|
|
{
|
|
int q = cur_field.getQuadding();
|
|
if (q != from_default_q)
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper override q");
|
|
obj.replaceKey(
|
|
"/Q",
|
|
QPDFObjectHandle::newInteger(from_default_q));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
class ResourceReplacer: public QPDFObjectHandle::TokenFilter
|
|
{
|
|
public:
|
|
ResourceReplacer(
|
|
std::map<std::string,
|
|
std::map<std::string,
|
|
std::string>> const& dr_map,
|
|
std::map<std::string,
|
|
std::map<std::string,
|
|
std::set<size_t>>> const& rnames);
|
|
virtual ~ResourceReplacer() = default;
|
|
virtual void handleToken(QPDFTokenizer::Token const&) override;
|
|
|
|
private:
|
|
size_t offset;
|
|
std::map<std::string, std::map<size_t, std::string>> to_replace;
|
|
};
|
|
|
|
ResourceReplacer::ResourceReplacer(
|
|
std::map<std::string,
|
|
std::map<std::string, std::string>> const& dr_map,
|
|
std::map<std::string,
|
|
std::map<std::string, std::set<size_t>>> const& rnames)
|
|
:
|
|
offset(0)
|
|
{
|
|
// We have:
|
|
// * dr_map[resource_type][key] == new_key
|
|
// * rnames[resource_type][key] == set of offsets
|
|
//
|
|
// We want:
|
|
// * to_replace[key][offset] = new_key
|
|
|
|
for (auto const& rn_iter: rnames)
|
|
{
|
|
std::string const& rtype = rn_iter.first;
|
|
auto dr_map_rtype = dr_map.find(rtype);
|
|
if (dr_map_rtype == dr_map.end())
|
|
{
|
|
continue;
|
|
}
|
|
auto const& key_offsets = rn_iter.second;
|
|
for (auto const& ko_iter: key_offsets)
|
|
{
|
|
std::string const& old_key = ko_iter.first;
|
|
auto dr_map_rtype_old = dr_map_rtype->second.find(old_key);
|
|
if (dr_map_rtype_old == dr_map_rtype->second.end())
|
|
{
|
|
continue;
|
|
}
|
|
auto const& offsets = ko_iter.second;
|
|
for (auto const& o_iter: offsets)
|
|
{
|
|
to_replace[old_key][o_iter] = dr_map_rtype_old->second;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ResourceReplacer::handleToken(QPDFTokenizer::Token const& token)
|
|
{
|
|
bool wrote = false;
|
|
if (token.getType() == QPDFTokenizer::tt_name)
|
|
{
|
|
std::string name =
|
|
QPDFObjectHandle::newName(token.getValue()).getName();
|
|
if (to_replace.count(name) &&
|
|
to_replace[name].count(offset))
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper replaced DA token");
|
|
write(to_replace[name][offset]);
|
|
wrote = true;
|
|
}
|
|
}
|
|
this->offset += token.getRawValue().length();
|
|
if (! wrote)
|
|
{
|
|
writeToken(token);
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::adjustDefaultAppearances(
|
|
QPDFObjectHandle obj,
|
|
std::map<std::string,
|
|
std::map<std::string, std::string>> const& dr_map)
|
|
{
|
|
// This method is called on a field that has been copied from
|
|
// another file but whose /DA still refers to resources in the
|
|
// original file's /DR.
|
|
|
|
// When appearance streams are generated for variable text fields
|
|
// (see ISO 32000 PDF spec section 12.7.3.3), the field's /DA is
|
|
// used to generate content of the appearance stream. /DA contains
|
|
// references to resources that may be resolved in the document's
|
|
// /DR dictionary, which appears in the document's /AcroForm
|
|
// dictionary. For fields that we copied from other documents, we
|
|
// need to ensure that resources are mapped correctly in the case
|
|
// of conflicting names. For example, if a.pdf's /DR has /F1
|
|
// pointing to one font and b.pdf's /DR also has /F1 but it points
|
|
// elsewhere, we need to make sure appearance streams of fields
|
|
// copied from b.pdf into a.pdf use whatever font /F1 meant in
|
|
// b.pdf, not whatever it means in a.pdf. This method takes care
|
|
// of that. It is only called on fields copied from foreign files.
|
|
|
|
// A few notes:
|
|
//
|
|
// * If the from document's /DR and the current document's /DR
|
|
// have conflicting keys, we have already resolved the conflicts
|
|
// before calling this method. The dr_map parameter contains the
|
|
// mapping from old keys to new keys.
|
|
//
|
|
// * /DA may be inherited from the document's /AcroForm
|
|
// dictionary. By the time this method has been called, we have
|
|
// already copied any document-level values into the fields to
|
|
// avoid having them inherit from the new document. This was
|
|
// done in adjustInheritedFields.
|
|
|
|
auto DA = obj.getKey("/DA");
|
|
if (! DA.isString())
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Find names in /DA. /DA is a string that contains content
|
|
// stream-like code, so we create a stream out of the string and
|
|
// then filter it. We don't attach the stream to anything, so it
|
|
// will get discarded.
|
|
ResourceFinder rf;
|
|
auto da_stream = QPDFObjectHandle::newStream(
|
|
&this->qpdf, DA.getUTF8Value());
|
|
try
|
|
{
|
|
auto nwarnings = this->qpdf.numWarnings();
|
|
da_stream.parseAsContents(&rf);
|
|
if (this->qpdf.numWarnings() > nwarnings)
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper /DA parse error");
|
|
}
|
|
}
|
|
catch (std::exception& e)
|
|
{
|
|
// No way to reproduce in test suite right now since error
|
|
// conditions are converted to warnings.
|
|
obj.warnIfPossible(
|
|
std::string("Unable to parse /DA: ") + e.what() +
|
|
"; this form field may not update properly");
|
|
return;
|
|
}
|
|
|
|
// Regenerate /DA by filtering its tokens.
|
|
ResourceReplacer rr(dr_map, rf.getNamesByResourceType());
|
|
Pl_Buffer buf_pl("filtered DA");
|
|
da_stream.filterAsContents(&rr, &buf_pl);
|
|
PointerHolder<Buffer> buf = buf_pl.getBuffer();
|
|
std::string new_da(
|
|
reinterpret_cast<char*>(buf->getBuffer()), buf->getSize());
|
|
obj.replaceKey("/DA", QPDFObjectHandle::newString(new_da));
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::adjustAppearanceStream(
|
|
QPDFObjectHandle stream,
|
|
std::map<std::string, std::map<std::string, std::string>> dr_map)
|
|
{
|
|
// We don't have to modify appearance streams or their resource
|
|
// dictionaries for them to display properly, but we need to do so
|
|
// to make them save to regenerate. Suppose an appearance stream
|
|
// as a font /F1 that is different from /F1 in /DR, and that when
|
|
// we copy the field, /F1 is remapped to /F1_1. When the field is
|
|
// regenerated, /F1_1 won't appear in the stream's resource
|
|
// dictionary, so the regenerated appearance stream will revert to
|
|
// the /F1_1 in /DR. If we adjust existing appearance streams, we
|
|
// are protected from this problem.
|
|
|
|
auto dict = stream.getDict();
|
|
auto resources = dict.getKey("/Resources");
|
|
|
|
// Make sure this stream has its own private resource dictionary.
|
|
bool was_indirect = resources.isIndirect();
|
|
resources = resources.shallowCopy();
|
|
if (was_indirect)
|
|
{
|
|
resources = this->qpdf.makeIndirectObject(resources);
|
|
}
|
|
dict.replaceKey("/Resources", resources);
|
|
// Create a dictionary with top-level keys so we can use
|
|
// mergeResources to force them to be unshared. We will also use
|
|
// this to resolve conflicts that may already be in the resource
|
|
// dictionary.
|
|
auto merge_with = QPDFObjectHandle::newDictionary();
|
|
for (auto const& top_key: dr_map)
|
|
{
|
|
merge_with.replaceKey(
|
|
top_key.first, QPDFObjectHandle::newDictionary());
|
|
}
|
|
resources.mergeResources(merge_with);
|
|
// Rename any keys in the resource dictionary that we
|
|
// remapped.
|
|
for (auto const& i1: dr_map)
|
|
{
|
|
std::string const& top_key = i1.first;
|
|
auto subdict = resources.getKey(top_key);
|
|
if (! subdict.isDictionary())
|
|
{
|
|
continue;
|
|
}
|
|
for (auto const& i2: i1.second)
|
|
{
|
|
std::string const& old_key = i2.first;
|
|
std::string const& new_key = i2.second;
|
|
auto existing_new = subdict.getKey(new_key);
|
|
if (! existing_new.isNull())
|
|
{
|
|
// The resource dictionary already has a key in it
|
|
// matching what we remapped an old key to, so we'll
|
|
// have to move it out of the way. Stick it in
|
|
// merge_with, which we will re-merge with the
|
|
// dictionary when we're done. We know merge_with
|
|
// already has dictionaries for all the top keys.
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper ap conflict");
|
|
merge_with.getKey(top_key).replaceKey(new_key, existing_new);
|
|
}
|
|
auto existing_old = subdict.getKey(old_key);
|
|
if (! existing_old.isNull())
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper ap rename");
|
|
subdict.replaceKey(new_key, existing_old);
|
|
subdict.removeKey(old_key);
|
|
}
|
|
}
|
|
}
|
|
// Deal with any any conflicts by re-merging with merge_with and
|
|
// updating our local copy of dr_map, which we will use to modify
|
|
// the stream contents.
|
|
resources.mergeResources(merge_with, &dr_map);
|
|
// Remove empty subdictionaries
|
|
for (auto iter: resources.ditems())
|
|
{
|
|
if (iter.second.isDictionary() &&
|
|
(iter.second.getKeys().size() == 0))
|
|
{
|
|
resources.removeKey(iter.first);
|
|
}
|
|
}
|
|
|
|
// Now attach a token filter to replace the actual resources.
|
|
ResourceFinder rf;
|
|
try
|
|
{
|
|
auto nwarnings = this->qpdf.numWarnings();
|
|
stream.parseAsContents(&rf);
|
|
if (this->qpdf.numWarnings() > nwarnings)
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper AP parse error");
|
|
}
|
|
auto rr = new ResourceReplacer(dr_map, rf.getNamesByResourceType());
|
|
PointerHolder<QPDFObjectHandle::TokenFilter> tf = rr;
|
|
stream.addTokenFilter(tf);
|
|
}
|
|
catch (std::exception& e)
|
|
{
|
|
// No way to reproduce in test suite right now since error
|
|
// conditions are converted to warnings.
|
|
stream.warnIfPossible(
|
|
std::string("Unable to parse appearance stream: ") + e.what());
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::transformAnnotations(
|
|
QPDFObjectHandle old_annots,
|
|
std::vector<QPDFObjectHandle>& new_annots,
|
|
std::vector<QPDFObjectHandle>& new_fields,
|
|
std::set<QPDFObjGen>& old_fields,
|
|
QPDFMatrix const& cm,
|
|
QPDF* from_qpdf,
|
|
QPDFAcroFormDocumentHelper* from_afdh)
|
|
{
|
|
PointerHolder<QPDFAcroFormDocumentHelper> afdhph;
|
|
if (! from_qpdf)
|
|
{
|
|
// Assume these are from the same QPDF.
|
|
from_qpdf = &this->qpdf;
|
|
from_afdh = this;
|
|
}
|
|
else if ((from_qpdf != &this->qpdf) && (! from_afdh))
|
|
{
|
|
afdhph = new QPDFAcroFormDocumentHelper(*from_qpdf);
|
|
from_afdh = afdhph.getPointer();
|
|
}
|
|
bool foreign = (from_qpdf != &this->qpdf);
|
|
|
|
// It's possible that we will transform annotations that don't
|
|
// include any form fields. This code takes care not to muck
|
|
// around with /AcroForm unless we have to.
|
|
|
|
QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
|
|
QPDFObjectHandle from_acroform = from_qpdf->getRoot().getKey("/AcroForm");
|
|
|
|
// /DA and /Q may be inherited from the document-level /AcroForm
|
|
// dictionary. If we are copying a foreign stream and the stream
|
|
// is getting one of these values from its document's /AcroForm,
|
|
// we will need to copy the value explicitly so that it doesn't
|
|
// start getting its default from the destination document.
|
|
bool override_da = false;
|
|
bool override_q = false;
|
|
std::string from_default_da;
|
|
int from_default_q = 0;
|
|
// If we copy any form fields, we will need to merge the source
|
|
// document's /DR into this document's /DR.
|
|
QPDFObjectHandle from_dr = QPDFObjectHandle::newNull();
|
|
if (foreign)
|
|
{
|
|
std::string default_da;
|
|
int default_q = 0;
|
|
if (acroform.isDictionary())
|
|
{
|
|
if (acroform.getKey("/DA").isString())
|
|
{
|
|
default_da = acroform.getKey("/DA").getUTF8Value();
|
|
}
|
|
if (acroform.getKey("/Q").isInteger())
|
|
{
|
|
default_q = acroform.getKey("/Q").getIntValueAsInt();
|
|
}
|
|
}
|
|
if (from_acroform.isDictionary())
|
|
{
|
|
if (from_acroform.getKey("/DR").isDictionary())
|
|
{
|
|
from_dr = from_acroform.getKey("/DR");
|
|
if (! from_dr.isIndirect())
|
|
{
|
|
from_dr = from_qpdf->makeIndirectObject(from_dr);
|
|
}
|
|
from_dr = this->qpdf.copyForeignObject(from_dr);
|
|
}
|
|
if (from_acroform.getKey("/DA").isString())
|
|
{
|
|
from_default_da = from_acroform.getKey("/DA").getUTF8Value();
|
|
}
|
|
if (from_acroform.getKey("/Q").isInteger())
|
|
{
|
|
from_default_q = from_acroform.getKey("/Q").getIntValueAsInt();
|
|
}
|
|
}
|
|
if (from_default_da != default_da)
|
|
{
|
|
override_da = true;
|
|
}
|
|
if (from_default_q != default_q)
|
|
{
|
|
override_q = true;
|
|
}
|
|
}
|
|
|
|
// If we have to merge /DR, we will need a mapping of conflicting
|
|
// keys for rewriting /DA. Set this up for lazy initialization in
|
|
// case we encounter any form fields.
|
|
std::map<std::string, std::map<std::string, std::string>> dr_map;
|
|
bool initialized_dr_map = false;
|
|
QPDFObjectHandle dr = QPDFObjectHandle::newNull();
|
|
auto init_dr_map = [&]() {
|
|
if (! initialized_dr_map)
|
|
{
|
|
initialized_dr_map = true;
|
|
// Ensure that we have a /DR that is an indirect
|
|
// dictionary object.
|
|
if (! acroform.isDictionary())
|
|
{
|
|
acroform = getOrCreateAcroForm();
|
|
}
|
|
dr = acroform.getKey("/DR");
|
|
if (! dr.isDictionary())
|
|
{
|
|
dr = QPDFObjectHandle::newDictionary();
|
|
}
|
|
dr.makeResourcesIndirect(this->qpdf);
|
|
if (! dr.isIndirect())
|
|
{
|
|
dr = this->qpdf.makeIndirectObject(dr);
|
|
acroform.replaceKey("/DR", dr);
|
|
}
|
|
// Merge the other document's /DR, creating a conflict
|
|
// map. mergeResources checks to make sure both objects
|
|
// are dictionaries. By this point, if this is foreign,
|
|
// from_dr has been copied, so we use the target qpdf as
|
|
// the owning qpdf.
|
|
from_dr.makeResourcesIndirect(this->qpdf);
|
|
dr.mergeResources(from_dr, &dr_map);
|
|
|
|
if (from_afdh->getNeedAppearances())
|
|
{
|
|
setNeedAppearances(true);
|
|
}
|
|
}
|
|
};
|
|
|
|
// This helper prevents us from copying the same object
|
|
// multiple times.
|
|
std::map<QPDFObjGen, QPDFObjectHandle> orig_to_copy;
|
|
auto maybe_copy_object = [&](QPDFObjectHandle& to_copy) {
|
|
auto og = to_copy.getObjGen();
|
|
if (orig_to_copy.count(og))
|
|
{
|
|
to_copy = orig_to_copy[og];
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
to_copy = this->qpdf.makeIndirectObject(to_copy.shallowCopy());
|
|
orig_to_copy[og] = to_copy;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
// Now do the actual copies.
|
|
|
|
std::set<QPDFObjGen> added_new_fields;
|
|
for (auto annot: old_annots.aitems())
|
|
{
|
|
if (annot.isStream())
|
|
{
|
|
annot.warnIfPossible("ignoring annotation that's a stream");
|
|
continue;
|
|
}
|
|
|
|
// Make copies of annotations and fields down to the
|
|
// appearance streams, preserving all internal referential
|
|
// integrity. When the incoming annotations are from a
|
|
// different file, we first copy them locally. Then, whether
|
|
// local or foreign, we copy them again so that if we bring
|
|
// the same annotation in multiple times (e.g. overlaying a
|
|
// foreign page onto multiple local pages or a local page onto
|
|
// multiple other local pages), we don't create annotations
|
|
// that are referenced in more than one place. If we did that,
|
|
// the effect of applying transformations would be cumulative,
|
|
// which is definitely not what we want. Besides, annotations
|
|
// and fields are not intended to be referenced in multiple
|
|
// places.
|
|
|
|
// Determine if this annotation is attached to a form field.
|
|
// If so, the annotation may be the same object as the form
|
|
// field, or the form field may have the annotation as a kid.
|
|
// In either case, we have to walk up the field structure to
|
|
// find the top-level field. Within one iteration through a
|
|
// set of annotations, we don't want to copy the same item
|
|
// more than once. For example, suppose we have field A with
|
|
// kids B, C, and D, each of which has annotations BA, CA, and
|
|
// DA. When we get to BA, we will find that BA is a kid of B
|
|
// which is under A. When we do a copyForeignObject of A, it
|
|
// will also copy everything else because of the indirect
|
|
// references. When we clone BA, we will want to clone A and
|
|
// then update A's clone's kid to point B's clone and B's
|
|
// clone's parent to point to A's clone. The same thing holds
|
|
// for annotations. Next, when we get to CA, we will again
|
|
// discover that A is the top, but we don't want to re-copy A.
|
|
// We want CA's clone to be linked to the same clone as BA's.
|
|
// Failure to do this will break up things like radio button
|
|
// groups, which all have to kids of the same parent.
|
|
|
|
auto ffield = from_afdh->getFieldForAnnotation(annot);
|
|
auto ffield_oh = ffield.getObjectHandle();
|
|
QPDFObjectHandle top_field;
|
|
bool have_field = false;
|
|
bool have_parent = false;
|
|
if (ffield_oh.isStream())
|
|
{
|
|
ffield_oh.warnIfPossible("ignoring form field that's a stream");
|
|
}
|
|
else if ((! ffield_oh.isNull()) && (! ffield_oh.isIndirect()))
|
|
{
|
|
ffield_oh.warnIfPossible("ignoring form field not indirect");
|
|
}
|
|
else if (! ffield_oh.isNull())
|
|
{
|
|
// A field and its associated annotation can be the same
|
|
// object. This matters because we don't want to clone the
|
|
// annotation and field separately in this case.
|
|
have_field = true;
|
|
// Find the top-level field. It may be the field itself.
|
|
top_field = ffield.getTopLevelField(
|
|
&have_parent).getObjectHandle();
|
|
if (foreign)
|
|
{
|
|
// copyForeignObject returns the same value if called
|
|
// multiple times with the same field. Create/retrieve
|
|
// the local copy of the original field. This pulls
|
|
// over everything the field references including
|
|
// annotations and appearance streams, but it's
|
|
// harmless to call copyForeignObject on them too.
|
|
// They will already be copied, so we'll get the right
|
|
// object back.
|
|
|
|
// top_field and ffield_oh are known to be indirect.
|
|
top_field = this->qpdf.copyForeignObject(top_field);
|
|
ffield_oh = this->qpdf.copyForeignObject(ffield_oh);
|
|
}
|
|
else
|
|
{
|
|
// We don't need to add top_field to old_fields if
|
|
// it's foreign because the new copy of the foreign
|
|
// field won't be referenced anywhere. It's just the
|
|
// starting point for us to make an additional local
|
|
// copy of.
|
|
old_fields.insert(top_field.getObjGen());
|
|
}
|
|
|
|
// Traverse the field, copying kids, and preserving
|
|
// integrity.
|
|
std::list<QPDFObjectHandle> queue;
|
|
if (maybe_copy_object(top_field))
|
|
{
|
|
queue.push_back(top_field);
|
|
}
|
|
std::set<QPDFObjGen> seen;
|
|
while (! queue.empty())
|
|
{
|
|
QPDFObjectHandle obj = queue.front();
|
|
queue.pop_front();
|
|
auto orig_og = obj.getObjGen();
|
|
if (seen.count(orig_og))
|
|
{
|
|
// loop
|
|
break;
|
|
}
|
|
seen.insert(orig_og);
|
|
auto parent = obj.getKey("/Parent");
|
|
if (parent.isIndirect())
|
|
{
|
|
auto parent_og = parent.getObjGen();
|
|
if (orig_to_copy.count(parent_og))
|
|
{
|
|
obj.replaceKey("/Parent", orig_to_copy[parent_og]);
|
|
}
|
|
else
|
|
{
|
|
parent.warnIfPossible(
|
|
"while traversing field " +
|
|
obj.getObjGen().unparse() +
|
|
", found parent (" + parent_og.unparse() +
|
|
") that had not been seen, indicating likely"
|
|
" invalid field structure");
|
|
}
|
|
}
|
|
auto kids = obj.getKey("/Kids");
|
|
if (kids.isArray())
|
|
{
|
|
for (int i = 0; i < kids.getArrayNItems(); ++i)
|
|
{
|
|
auto kid = kids.getArrayItem(i);
|
|
if (maybe_copy_object(kid))
|
|
{
|
|
kids.setArrayItem(i, kid);
|
|
queue.push_back(kid);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (override_da || override_q)
|
|
{
|
|
adjustInheritedFields(
|
|
obj, override_da, from_default_da,
|
|
override_q, from_default_q);
|
|
}
|
|
if (foreign)
|
|
{
|
|
// Lazily initialize our /DR and the conflict map.
|
|
init_dr_map();
|
|
// The spec doesn't say anything about /DR on the
|
|
// field, but lots of writers put one there, and
|
|
// it is frequently the same as the document-level
|
|
// /DR. To avoid having the field's /DR point to
|
|
// information that we are not maintaining, just
|
|
// reset it to that if it exists. Empirical
|
|
// evidence suggests that many readers, including
|
|
// Acrobat, Adobe Acrobat Reader, chrome, firefox,
|
|
// the mac Preview application, and several of the
|
|
// free readers on Linux all ignore /DR at the
|
|
// field level.
|
|
if (obj.hasKey("/DR"))
|
|
{
|
|
obj.replaceKey("/DR", dr);
|
|
}
|
|
}
|
|
if (foreign && obj.getKey("/DA").isString() &&
|
|
(! dr_map.empty()))
|
|
{
|
|
adjustDefaultAppearances(obj, dr_map);
|
|
}
|
|
}
|
|
|
|
// Now switch to copies. We already switched for top_field
|
|
maybe_copy_object(ffield_oh);
|
|
ffield = QPDFFormFieldObjectHelper(ffield_oh);
|
|
}
|
|
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper copy annotation",
|
|
(have_field ? 1 : 0) | (foreign ? 2 : 0));
|
|
if (have_field)
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper field with parent",
|
|
(have_parent ? 1 : 0) | (foreign ? 2 : 0));
|
|
}
|
|
if (foreign)
|
|
{
|
|
if (! annot.isIndirect())
|
|
{
|
|
annot = from_qpdf->makeIndirectObject(annot);
|
|
}
|
|
annot = this->qpdf.copyForeignObject(annot);
|
|
}
|
|
maybe_copy_object(annot);
|
|
|
|
// Now we have copies, so we can safely mutate.
|
|
if (have_field && ! added_new_fields.count(top_field.getObjGen()))
|
|
{
|
|
new_fields.push_back(top_field);
|
|
added_new_fields.insert(top_field.getObjGen());
|
|
}
|
|
new_annots.push_back(annot);
|
|
|
|
// Identify and copy any appearance streams
|
|
|
|
auto ah = QPDFAnnotationObjectHelper(annot);
|
|
auto apdict = ah.getAppearanceDictionary();
|
|
std::vector<QPDFObjectHandle> streams;
|
|
auto replace_stream = [](auto& dict, auto& key, auto& old) {
|
|
auto new_stream = old.copyStream();
|
|
dict.replaceKey(key, new_stream);
|
|
return new_stream;
|
|
};
|
|
if (apdict.isDictionary())
|
|
{
|
|
for (auto& ap: apdict.ditems())
|
|
{
|
|
if (ap.second.isStream())
|
|
{
|
|
streams.push_back(
|
|
replace_stream(apdict, ap.first, ap.second));
|
|
}
|
|
else if (ap.second.isDictionary())
|
|
{
|
|
for (auto& ap2: ap.second.ditems())
|
|
{
|
|
if (ap2.second.isStream())
|
|
{
|
|
streams.push_back(
|
|
replace_stream(
|
|
ap.second, ap2.first, ap2.second));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now we can safely mutate the annotation and its appearance
|
|
// streams.
|
|
for (auto& stream: streams)
|
|
{
|
|
auto dict = stream.getDict();
|
|
auto omatrix = dict.getKey("/Matrix");
|
|
QPDFMatrix apcm;
|
|
if (omatrix.isArray())
|
|
{
|
|
QTC::TC("qpdf", "QPDFAcroFormDocumentHelper modify ap matrix");
|
|
auto m1 = omatrix.getArrayAsMatrix();
|
|
apcm = QPDFMatrix(m1);
|
|
}
|
|
apcm.concat(cm);
|
|
auto new_matrix = QPDFObjectHandle::newFromMatrix(apcm);
|
|
if (omatrix.isArray() || (apcm != QPDFMatrix()))
|
|
{
|
|
dict.replaceKey("/Matrix", new_matrix);
|
|
}
|
|
auto resources = dict.getKey("/Resources");
|
|
if ((! dr_map.empty()) && resources.isDictionary())
|
|
{
|
|
adjustAppearanceStream(stream, dr_map);
|
|
}
|
|
}
|
|
auto rect = cm.transformRectangle(
|
|
annot.getKey("/Rect").getArrayAsRectangle());
|
|
annot.replaceKey(
|
|
"/Rect", QPDFObjectHandle::newFromRectangle(rect));
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::copyFieldsFromForeignPage(
|
|
QPDFPageObjectHelper foreign_page,
|
|
QPDFAcroFormDocumentHelper& foreign_afdh,
|
|
std::vector<QPDFObjectHandle>* copied_fields)
|
|
{
|
|
this->qpdf.warn(
|
|
QPDFExc(qpdf_e_unsupported, "", "", 0,
|
|
"Non-working version of copyFieldsFromForeignPage"
|
|
" from qpdf 10.2 called; application requires updating"));
|
|
}
|
|
|
|
void
|
|
QPDFAcroFormDocumentHelper::fixCopiedAnnotations(
|
|
QPDFObjectHandle to_page,
|
|
QPDFObjectHandle from_page,
|
|
QPDFAcroFormDocumentHelper& from_afdh,
|
|
std::set<QPDFObjGen>* added_fields)
|
|
{
|
|
auto old_annots = from_page.getKey("/Annots");
|
|
if ((! old_annots.isArray()) || (old_annots.getArrayNItems() == 0))
|
|
{
|
|
return;
|
|
}
|
|
|
|
std::vector<QPDFObjectHandle> new_annots;
|
|
std::vector<QPDFObjectHandle> new_fields;
|
|
std::set<QPDFObjGen> old_fields;
|
|
transformAnnotations(old_annots, new_annots, new_fields, old_fields,
|
|
QPDFMatrix(), &(from_afdh.getQPDF()),
|
|
&from_afdh);
|
|
|
|
to_page.replaceKey("/Annots", QPDFObjectHandle::newArray(new_annots));
|
|
addAndRenameFormFields(new_fields);
|
|
if (added_fields)
|
|
{
|
|
for (auto f: new_fields)
|
|
{
|
|
added_fields->insert(f.getObjGen());
|
|
}
|
|
}
|
|
}
|