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LibPDF: Load destinations from Catalogue -> Names -> Dests name tree

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PDF allows for named destinations to be provided as string. These can be
either found in the Dests dictionary in the document catalogue (as
already implemented), or in the Name Tree specified by the Dests key in
the Names dictionary of the document catalogue (missing).

This commit adds this missing case. Once the named destination is found
in the name tree, its value is interpreted just like in the first case,
so a new utility method encapsulates the common behavior.
This commit is contained in:
Rodrigo Tobar 2023-01-06 00:41:44 +08:00 committed by Andreas Kling
parent 5420261347
commit a5620fd41f
Notes: sideshowbarker 2024-07-17 18:13:59 +09:00 
Author: https://github.com/rtobar
Commit: https://github.com/SerenityOS/serenity/commit/a5620fd41f
Pull-request: https://github.com/SerenityOS/serenity/pull/16840
2 changed files with 25 additions and 10 deletions
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34
Userland/Libraries/LibPDF/Document.cpp
View file

@ -315,6 +315,17 @@ PDFErrorOr<NonnullRefPtr<Object>> Document::get_inheritable_object(FlyString con
return object->get_object(this, name);
}
PDFErrorOr<Destination> Document::create_destination_from_dictionary_entry(NonnullRefPtr<Object> const& entry, HashMap<u32, u32> const& page_number_by_index_ref)
{
if (entry->is<ArrayObject>()) {
auto entry_array = entry->cast<ArrayObject>();
return create_destination_from_parameters(entry_array, page_number_by_index_ref);
}
auto entry_dictionary = entry->cast<DictObject>();
auto d_array = MUST(entry_dictionary->get_array(this, CommonNames::D));
return create_destination_from_parameters(d_array, page_number_by_index_ref);
}
PDFErrorOr<NonnullRefPtr<OutlineItem>> Document::build_outline_item(NonnullRefPtr<DictObject> const& outline_item_dict, HashMap<u32, u32> const& page_number_by_index_ref)
{
auto outline_item = adopt_ref(*new OutlineItem {});
@ -340,19 +351,22 @@ PDFErrorOr<NonnullRefPtr<OutlineItem>> Document::build_outline_item(NonnullRefPt
if (dest_obj->is<ArrayObject>()) {
auto dest_arr = dest_obj->cast<ArrayObject>();
outline_item->dest = TRY(create_destination_from_parameters(dest_arr, page_number_by_index_ref));
} else if (dest_obj->is<NameObject>()) {
auto dest_name = dest_obj->cast<NameObject>()->name();
} else if (dest_obj->is<NameObject>() || dest_obj->is<StringObject>()) {
FlyString dest_name;
if (dest_obj->is<NameObject>())
dest_name = dest_obj->cast<NameObject>()->name();
else
dest_name = dest_obj->cast<StringObject>()->string();
if (auto dests_value = m_catalog->get(CommonNames::Dests); dests_value.has_value()) {
auto dests = dests_value.value().get<NonnullRefPtr<Object>>()->cast<DictObject>();
auto entry = MUST(dests->get_object(this, dest_name));
if (entry->is<ArrayObject>()) {
auto entry_array = entry->cast<ArrayObject>();
outline_item->dest = TRY(create_destination_from_parameters(entry_array, page_number_by_index_ref));
} else {
auto entry_dictionary = entry->cast<DictObject>();
auto d_array = MUST(entry_dictionary->get_array(this, CommonNames::D));
outline_item->dest = TRY(create_destination_from_parameters(d_array, page_number_by_index_ref));
}
outline_item->dest = TRY(create_destination_from_dictionary_entry(entry, page_number_by_index_ref));
} else if (auto names_value = m_catalog->get(CommonNames::Names); names_value.has_value()) {
auto names = TRY(resolve(names_value.release_value())).get<NonnullRefPtr<Object>>()->cast<DictObject>();
if (!names->contains(CommonNames::Dests))
return Error { Error::Type::MalformedPDF, "Missing Dests key in document catalogue's Names dictionary" };
auto dest_obj = TRY(find_in_name_tree(TRY(names->get_dict(this, CommonNames::Dests)), dest_name));
outline_item->dest = TRY(create_destination_from_dictionary_entry(dest_obj, page_number_by_index_ref));
} else {
return Error { Error::Type::MalformedPDF, "Malformed outline destination" };
}

1
Userland/Libraries/LibPDF/Document.h
View file

@ -136,6 +136,7 @@ private:
PDFErrorOr<NonnullRefPtrVector<OutlineItem>> build_outline_item_chain(Value const& first_ref, HashMap<u32, u32> const&);
PDFErrorOr<Destination> create_destination_from_parameters(NonnullRefPtr<ArrayObject>, HashMap<u32, u32> const&);
PDFErrorOr<Destination> create_destination_from_dictionary_entry(NonnullRefPtr<Object> const& entry, HashMap<u32, u32> const& page_number_by_index_ref);
PDFErrorOr<NonnullRefPtr<Object>> get_inheritable_object(FlyString const& name, NonnullRefPtr<DictObject>);