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LibPDF: Harden the document/parser against errors

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Matthew Olsson 2021-05-24 13:57:16 -07:00 • committed by Ali Mohammad Pur
parent d654fe0e41
commit 1ef5071d1b
6 changed files with 217 additions and 108 deletions
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10
Userland/Libraries/LibPDF/Document.h
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@ -73,7 +73,7 @@ struct OutlineDict final : public RefCounted<OutlineDict> {
class Document final : public RefCounted<Document> {
public:
explicit Document(const ReadonlyBytes& bytes);
static RefPtr<Document> create(const ReadonlyBytes& bytes);
ALWAYS_INLINE const XRefTable& xref_table() const { return m_xref_table; }
ALWAYS_INLINE const DictObject& trailer() const { return *m_trailer; }
@ -123,20 +123,22 @@ public:
}
private:
explicit Document(const NonnullRefPtr<Parser>& parser);
// FIXME: Currently, to improve performance, we don't load any pages at Document
// construction, rather we just load the page structure and populate
// m_page_object_indices. However, we can be even lazier and defer page tree node
// parsing, as good PDF writers will layout the page tree in a balanced tree to
// improve lookup time. This would reduce the initial overhead by not loading
// every page tree node of, say, a 1000+ page PDF file.
void build_page_tree();
void add_page_tree_node_to_page_tree(NonnullRefPtr<DictObject> page_tree);
bool build_page_tree();
bool add_page_tree_node_to_page_tree(NonnullRefPtr<DictObject> page_tree);
void build_outline();
NonnullRefPtr<OutlineItem> build_outline_item(NonnullRefPtr<DictObject> outline_item_dict);
NonnullRefPtrVector<OutlineItem> build_outline_item_chain(const Value& first_ref, const Value& last_ref);
Parser m_parser;
NonnullRefPtr<Parser> m_parser;
XRefTable m_xref_table;
RefPtr<DictObject> m_trailer;
RefPtr<DictObject> m_catalog;