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>
- Add decode_page_content_streams() function for per-page lazy decode
- Update extract_page_from_dict() to support lazy stream decoding
- Modify extract_pdf() and extract_pdf_ndjson() to enable lazy decoding
- Fix borrow checker issue in LazyPageIter::next()
This ensures content streams are decoded lazily per page and dropped
immediately after processing, keeping peak RSS flat across page count.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implement the libpdftract native FFI library as a cdylib + staticlib
with cbindgen-generated headers and full extern "C" API.
Components:
- crates/pdftract-libpdftract/ with cdylib + staticlib targets
- All 9 contract methods + utility functions as extern "C"
- cbindgen config and generated pdftract.h header
- pkg-config template (pdftract.pc.in)
- Homebrew formula template (distribution/homebrew/)
- vcpkg port template (distribution/vcpkg/)
- C conformance test (tests/conformance.c)
API features:
- Owned JSON strings returned via CString::into_raw()
- Caller frees with pdftract_free() (not libc free())
- Thread-local error storage (pdftract_last_error)
- Thread-safe and reentrant (no global mutable state)
- ABI version function for compatibility checking
Verification:
- cargo build produces libpdftract.so and libpdftract.a
- Conformance test compiles and runs successfully
- Thread safety verified with 4 concurrent threads
References:
- Plan line 3477: SDK Architecture / The Ten SDKs
- Bead: pdftract-1eaxm
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Updated test_api_null.c to run 10,000 alloc/free cycles (was 100)
- Updated verification note to mark memory roundtrip as PASS
- Improved stream_next implementation to use reference-based approach
instead of Box::from_raw/leak dance for cleaner memory handling
All acceptance criteria for pdftract-5ya9x now PASS:
- 12 exported symbols verified via nm -D
- C client tests (test_api.c, test_api_null.c)
- C++ client test (test_extract.cpp)
- Null pointer safety
- Panic safety (catch_unwind on all entry points)
- Memory roundtrip (10,000 iterations)
- Thread safety (8 pthreads)
Co-Authored-By: Claude Code <noreply@anthropic.com>
