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LibPDF: Implement name tree lookups

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Name Trees are hierarchical, string-keyed, sorted-by-key dictionary
structures in PDF where each node (except the root) specifies the bounds
of the values it holds, and either its kids (more nodes) or the
key/value pairs it contains.

This commit implements a series of lookup calls for finding a key in
such name trees. This implementation follows the tree as needed on each
lookup, but if that becomes inefficient in the long run we can switch to
creating a HashMap with all the contents, which as a drawback will
require more memory.
This commit is contained in:
Rodrigo Tobar 2023-01-06 00:33:24 +08:00 • committed by Andreas Kling
parent 8c79f0e0cf
commit 5420261347
3 changed files with 46 additions and 0 deletions
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4
Userland/Libraries/LibPDF/Document.h
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@ -139,6 +139,10 @@ private:
PDFErrorOr<NonnullRefPtr<Object>> get_inheritable_object(FlyString const& name, NonnullRefPtr<DictObject>);
PDFErrorOr<NonnullRefPtr<Object>> find_in_name_tree(NonnullRefPtr<DictObject> root, FlyString name);
PDFErrorOr<NonnullRefPtr<Object>> find_in_name_tree_nodes(NonnullRefPtr<ArrayObject> siblings, FlyString name);
PDFErrorOr<NonnullRefPtr<Object>> find_in_key_value_array(NonnullRefPtr<ArrayObject> key_value_array, FlyString name);
NonnullRefPtr<DocumentParser> m_parser;
RefPtr<DictObject> m_catalog;
RefPtr<DictObject> m_trailer;