Add thread_local HashSet<ObjRef> tracking for circular reference detection
in the Object Parser. This prevents infinite recursion when PDF objects
contain circular references.
- Created cycle.rs module with RESOLVING thread_local storage
- ResolutionGuard RAII ensures cleanup on drop (even on panic)
- is_resolving() helper for cycle detection
- All 13 cycle tests pass
Closes: pdftract-522li
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implement per-word validation filter for assisted-OCR BrokenVector path.
Changes:
- Add SpanSource::OcrAssisted variant to hybrid.rs
- Add Span::ocr_assisted() helper method
- Implement validate_ocr_with_position_hints() in ocr.rs
- 5pt distance threshold for position validation
- 0.4 confidence cap for rejected words
- Linear scan for nearest-neighbor lookup
- Add unit tests for validation filter
Closes: pdftract-3s2i
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Fixed compilation error in xref.rs where u64 literal 0x5DEECE66D was used
with u32 state, causing overflow. Changed state to u64 for proper Java
Random algorithm behavior.
The OCG /OCProperties parsing implementation was already complete and
all tests pass. See notes/pdftract-2a6rk.md for verification.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Fix Token::Keyword to use b"..." .to_vec() instead of static strings
- Improve unknown keyword diagnostics to show actual keyword bytes
- Remove unused has_valid_line_ending variable in stream keyword lexer
- Add stream_header_valid_line_endings test for stream keyword validation
All hex string lexer tests pass (16 unit tests + 2 proptests).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-2hm4
Implement the document catalog parser (/Root traversal) for PDF documents.
The catalog parser extracts all key entries from the document catalog
including Pages, Outlines, MarkInfo, StructTreeRoot, AcroForm, Names,
Metadata, PageLabels, OCProperties, OpenAction, AA, and Version.
Key structures:
- MarkInfo: parses /MarkInfo dictionary with is_tagged, user_properties, suspects
- PageLabelStyle: enum for all label styles (D, R, r, A, a)
- PageLabel: single page label with style, prefix, and start value
- PageLabelsTree: number tree parser for /PageLabels with /Nums and /Kids support
- OcProperties: stub for OCG implementation (delegated to dedicated bead)
- Catalog: main catalog struct with all required and optional fields
Number tree implementation:
- Parses /Nums arrays (leaf nodes with alternating key-value pairs)
- Supports /Kids arrays (internal nodes for recursive tree traversal)
- Provides get_label_with_start() and get_label() methods for lookup
- Correctly formats roman numerals (uppercase/lowercase) and letter sequences
All 27 tests pass including proptests for fuzzing robustness (INV-8).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
