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LibPDF: Harden the document/parser against errors

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This commit is contained in:
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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31
Userland/Libraries/LibPDF/Parser.h
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@ -16,7 +16,7 @@ namespace PDF {
class Document;
class Parser {
class Parser final : public RefCounted<Parser> {
public:
static Vector<Command> parse_graphics_commands(const ReadonlyBytes&);
@ -30,18 +30,18 @@ public:
XRefTable xref_table;
NonnullRefPtr<DictObject> trailer;
};
XRefTableAndTrailer parse_last_xref_table_and_trailer();
Optional<XRefTableAndTrailer> parse_last_xref_table_and_trailer();
NonnullRefPtr<IndirectValue> parse_indirect_value_at_offset(size_t offset);
RefPtr<IndirectValue> parse_indirect_value_at_offset(size_t offset);
RefPtr<DictObject> conditionally_parse_page_tree_node_at_offset(size_t offset);
RefPtr<DictObject> conditionally_parse_page_tree_node_at_offset(size_t offset, bool& ok);
private:
explicit Parser(const ReadonlyBytes&);
bool parse_header();
XRefTable parse_xref_table();
NonnullRefPtr<DictObject> parse_file_trailer();
Optional<XRefTable> parse_xref_table();
RefPtr<DictObject> parse_file_trailer();
bool navigate_to_before_eof_marker();
bool navigate_to_after_startxref();
@ -58,16 +58,16 @@ private:
Value parse_value();
Value parse_possible_indirect_value_or_ref();
NonnullRefPtr<IndirectValue> parse_indirect_value(int index, int generation);
NonnullRefPtr<IndirectValue> parse_indirect_value();
RefPtr<IndirectValue> parse_indirect_value(int index, int generation);
RefPtr<IndirectValue> parse_indirect_value();
Value parse_number();
NonnullRefPtr<NameObject> parse_name();
NonnullRefPtr<StringObject> parse_string();
RefPtr<NameObject> parse_name();
RefPtr<StringObject> parse_string();
String parse_literal_string();
String parse_hex_string();
NonnullRefPtr<ArrayObject> parse_array();
NonnullRefPtr<DictObject> parse_dict();
NonnullRefPtr<StreamObject> parse_stream(NonnullRefPtr<DictObject> dict);
RefPtr<ArrayObject> parse_array();
RefPtr<DictObject> parse_dict();
RefPtr<StreamObject> parse_stream(NonnullRefPtr<DictObject> dict);
Vector<Command> parse_graphics_commands();
@ -77,10 +77,11 @@ private:
bool matches_delimiter() const;
bool matches_regular_character() const;
void consume_eol();
bool consume_eol();
bool consume_whitespace();
char consume();
void consume(char);
void consume(int amount);
bool consume(char);
Reader m_reader;
RefPtr<Document> m_document;