Implement the Receipt struct and lite-mode JSON serialization for
visual citation receipts. This provides cryptographic proof of
provenance for extracted text.
Changes:
- Add Receipt struct with 6 fields (pdf_fingerprint, page_index,
bbox, content_hash, extraction_version, svg_clip)
- Implement Receipt::lite() constructor with NFC normalization
- Integrate Receipt into SpanJson and BlockJson schemas
- Add unicode-normalization and serde_json dependencies
Acceptance criteria:
- Receipt::lite() produces valid receipts with svg_clip=None
- Lite mode JSON omits svg_clip key via skip_serializing_if
- Content hash uses NFC normalization for cross-platform stability
- Receipt wired into SpanJson and BlockJson types
Note: 100 receipts aggregate size is ~27 KB (not 15 KB as planned).
The 15 KB target is not achievable with required field sizes.
Refs: pdftract-5zm86, Phase 6.8 Visual Citation Receipts (lines 2351-2417)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Changes from Phase 6.7 child beads that were not committed earlier:
- Add subtle dependency for constant-time token comparison
- Add root directory for path-traversal protection in HTTP+SSE transport
- Update MCP server state to support --root flag
- Minor fixes and improvements across MCP modules
These changes support the 7 closed child beads:
- pdftract-5xq16: JSON-RPC 2.0 framing layer
- pdftract-67tm8: stdio transport
- pdftract-g0ro2: HTTP+SSE transport
- pdftract-24kut: transport mutual exclusion enforcement
- pdftract-1rami: tool catalog (10 tools)
- pdftract-6696g: path-traversal protection
- pdftract-zltqd: bearer-token auth
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The --root DIR flag was already fully implemented in the codebase.
All 25 tests pass (12 unit + 13 integration tests).
Acceptance criteria verified:
- Path traversal rejected with -32602
- Absolute paths rejected when --root is set
- HTTPS URLs bypass the check
- Symlink escapes detected via canonicalize
- Startup validation for root directory
Co-Authored-By: Claude Code <noreply@anthropic.com>
Per ADR-006: stdio and HTTP transports are mutually exclusive because they
have opposite stdout discipline (stdio: JSON-RPC sink; HTTP: log channel).
Changes:
- Add clap ArgGroup with multiple(false) to enforce --stdio XOR --bind
- Default to stdio mode when neither flag is specified
- Change --bind from required String to Option<String>
- Add ADR-006 reference to help text and doc comments
- Add unit tests for CLI argument validation
Acceptance criteria:
- pdftract mcp → launches in stdio mode (default)
- pdftract mcp --stdio → launches in stdio mode
- pdftract mcp --bind ADDR → launches in HTTP+SSE mode
- pdftract mcp --stdio --bind ADDR → exits 2 with clap conflict error
- pdftract mcp --help shows mutual exclusivity note
- Unit test verifies ArgGroup conflict on dual-transport invocation
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implements the HTTP+SSE transport for the MCP server per bead pdftract-g0ro2.
All acceptance criteria PASS.
Routes:
- POST /: JSON-RPC requests (single or batch)
- GET /sse: Server-Sent Events for notifications
- GET /health: Health check (auth-exempt)
Key features:
- Reuses axum/tokio/tower-http from Phase 6.4 (no new deps)
- Bearer token auth (from sibling bead 6.7.7)
- Request body limit (256 MB default, configurable via --max-upload-mb)
- SSE keepalive every 30 seconds
- Broadcast channel for fan-out notifications
- Backpressure handling (drops lagged clients with WARN log)
- 100-client SSE limit (MAX_SSE_CLIENTS)
- Custom 413 Payload Too Large JSON response
- Batch request support per JSON-RPC 2.0 spec
All 10 integration tests pass:
- test_post_tools_list: POST / returns tool catalog
- test_get_sse_stream: GET /sse opens SSE stream with keepalive
- test_50_concurrent_clients: 50 concurrent clients succeed
- test_health_during_load: GET /health returns 200 under load
- test_post_batch_request: Batch requests return batch responses
- test_post_payload_too_large: POST / over limit returns 413 with JSON body
- test_auth_required_for_non_loopback: Bearer auth returns 401 with WWW-Authenticate
- test_post_single_request_returns_single_response: Single request returns single response
- test_unknown_method: Unknown method returns method_not_found error
- test_get_health: GET /health returns 200 with version info
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implements the stdio transport for the MCP server, enabling communication
with local agents (Claude Desktop, Claude Code, Continue, Cursor) over
standard input/output with Content-Length framing.
Core features:
- LSP-style Content-Length framing with \r\n terminators
- JSON-RPC 2.0 message parsing and serialization
- INV-9 compliance: stdout contains only JSON-RPC frames
- Panic hook redirects panics to stderr
- SIGTERM handler for graceful shutdown
- Parse errors return -32700 with id: null, then continue
Acceptance criteria:
- ✅ Piping tools/list with framing produces expected response < 50ms
- ✅ EOF on stdin → clean exit within 100ms
- ✅ Malformed JSON → -32700 error, subsequent requests work
- ✅ No println!/log output to stdout (INV-9 enforced)
- ✅ Panics go to stderr, no partial JSON on stdout
- ✅ SIGTERM → exit 0, SIGINT → immediate non-zero exit
Tests added:
- crates/pdftract-cli/tests/mcp-stdio.rs (8 integration tests, all pass)
- All 49 existing unit tests continue to pass
Refs: pdftract-67tm8, plan Phase 6.7.2
Add hand-rolled JSON-RPC 2.0 implementation for MCP server transports.
Module: crates/pdftract-cli/src/mcp/framing/
- Id enum with Number/String/Null variants preserving JSON type
- Request, Response, Notification, ErrorObject structs
- BatchMessage for batch request handling
- Strict jsonrpc version validation (must be "2.0")
- All 6 spec-defined error codes (-32700, -32600, -32601, -32602, -32603, -32099..-32000)
- Constructor helpers for common patterns
Acceptance criteria verified:
- Round-trip serialization/deserialization
- ID type preservation (number/string/null)
- Parse error responses with null id
- Method not found error construction
- Notification detection (no id field)
- Batch request handling
- Rejection of invalid jsonrpc versions
- Empty batch rejection
16 unit tests covering all spec requirements.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Enhanced the `detect_linearization` function to avoid false matches when
extracting keys from the linearization dictionary. Previous implementation
could incorrectly match "/L" within "/Linearized" or "/H" within other keys.
Changes:
- Added loop-based search in extract_number helper to skip substring matches
- Added similar substring-aware logic for /H (hint stream) parsing
- Added new diagnostic codes for /Prev chain error handling
- Added comprehensive verification note
Acceptance criteria PASS:
- Non-linearized files return None
- Valid linearized dict detected correctly
- File size mismatch (incremental update) invalidates linearization
- No /H entry returns None for hint_stream_offset
- Random bytes never panic (proptest)
- Forward scan disabled for linearized files
- INV-8 maintained (no panics on arbitrary input)
Co-Authored-By: Claude Code <noreply@anthropic.com>
The hybrid xref handler (merge_hybrid) was already implemented. This adds
a property-based test to verify it handles random combinations of traditional
and stream entries without panicking.
Changes:
- Added proptest_merge_hybrid_no_panic to proptest_tests module
- Tests random entry sets using prop::collection::hash_map
- Covers all entry types (InUse, Free, Compressed)
- Verification note confirms all acceptance criteria PASS
Test results: 9/9 merge_hybrid tests pass
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>
Implements merge_hybrid() and is_hybrid_trailer() for hybrid PDF files.
Hybrid files have both a traditional xref table at startxref and a
supplementary xref stream pointed to by /XRefStm in the trailer.
Per PDF spec, the traditional table is authoritative for objects it
covers; the stream's type-2 entries fill gaps not covered by the
traditional table.
Key behaviors:
- Traditional entries override stream entries for same object numbers
- Stream-only type-2 entries are added as gap fill
- Free/InUse conflicts emit STRUCT_HYBRID_CONFLICT diagnostic
- Merged trailer has /XRefStm key removed
- Result XrefSection has is_hybrid: true set
Acceptance criteria:
- Critical test: traditional entries override stream entries (PASS)
- Gap fill: stream-only type-2 entries added (PASS)
- Free/InUse conflict: diagnostic emitted (PASS)
- Non-hybrid trailer: is_hybrid_trailer returns false (PASS)
- proptest: no panics with random combinations (PASS)
- INV-8 maintained: no panics in library code (PASS)
Co-Authored-By: Claude Code <noreply@anthropic.com>
- Change resolve function signature from Fn(ObjRef) -> Option<PdfObject>
to Fn(ObjRef) -> Option<PdfStream> for type safety
- Fix caching: load_object_stream now properly populates cache
- Fix error propagation for /Extends chains (CircularRef, DepthExceeded)
- Fix test data: add whitespace between embedded objects for lexer
- Fix compilation error in test_truncated_objstm_body
All 16 objstm tests now pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The lexer should not emit diagnostics for unknown keywords because:
1. Many valid keywords (trailer, xref, etc.) are not in the initial dispatch table
2. The object parser is responsible for validating keywords against known operators
3. Emitting diagnostics here causes false positives for valid PDF constructs
This change aligns with the task requirement that unknown keywords emit
Token::Keyword without a diagnostic, letting the object parser handle
STRUCT_UNKNOWN_KEYWORD if needed.
Co-Authored-By: Claude Code <noreply@anthropic.com>
Fixed incorrect fallback behavior in keyword lexer functions. Four
functions (lex_e_keyword, lex_o_keyword, lex_r_keyword, lex_n_keyword)
were incorrectly calling lex_name() instead of lex_keyword() when
keywords didn't match.
When a PDF contains an unrecognized word starting with e/o/n/R
(e.g., "endob" instead of "endobj"), the lexer should fall back to
generic keyword parsing (Token::Keyword(bytes)), not name parsing.
Names always start with /, so calling lex_name() on input without
a leading / would incorrectly skip the first byte.
References:
- Bead: pdftract-5upi
- Notes: notes/pdftract-5upi.md
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Make diagnostics module visible to fingerprint module and fix
hash_page_geometry signature to match usage.
Changes:
- Add `pub mod diagnostics;` to lib.rs for module visibility
- Modify hash_page_geometry to create diagnostics internally
The canonicalize module already has complete implementation:
- canonicalize_f64: banker's rounding to 4dp for geometry
- normalize_content_stream: whitespace normalization via lexer
- serialize_dict_canonical: sorted-key dict serialization
- hash_resource_dict_canonical: order-independent resource hashing
Verification: notes/pdftract-154mz.md
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add details about the BytesSource cleanup bug fix and clarify that the
contract defines 7 error kinds, not 8 as initially stated in the task.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add comprehensive verification note for forward_scan_xref implementation.
The function was already implemented in xref.rs; this note documents
verification of all bead requirements.
Also fix duplicate ObjRef import in parser/mod.rs (ObjRef is defined in
diagnostics module and re-exported).
Bead: pdftract-46lw
The apostrophe in 'banker's_rounding' is invalid Rust 2021 syntax.
Changed to 'bankers_rounding' to fix compilation.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit implements the Cargo.lock policy for reproducible builds
across all workspace members (pdftract-core, pdftract-cli, pdftract-py).
Changes:
- Add CONTRIBUTING.md with lockfile-update workflow documentation
- Add .renovaterc.json for weekly lockfile-only PRs (human-gated)
- Add crates/pdftract-core/README.md with rationale for checked-in lockfiles
- Add notes/pdftract-49f8.md with verification note
The Argo workflow updates (pdftract-ci.yaml) are committed separately
in the declarative-config repo.
Acceptance criteria:
- PASS: Cargo.lock tracked by git, not in .gitignore
- PASS: Argo workflow templates document --locked/--frozen requirements
- WARN: Enforcement to be completed when placeholder templates are implemented
- WARN: Binary reproducibility verification deferred to pdftract-build-binaries implementation
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The structural token lexer was already fully implemented. All 84 lexer
tests pass, covering all acceptance criteria:
- Array/dict delimiters ([], <<>>)
- Keywords (true, false, null, obj, endobj, stream, endstream, R)
- Hex string vs dict ambiguity (< vs <<)
- Stream header validation (\n or \r\n only, lone \r is invalid)
- Case-sensitive keyword matching
This commit fixes a pre-existing compilation error in xref.rs where
forward_scan_memory() called parse_obj_header_at_memory() which didn't
exist. Added the missing function as a byte-slice variant of
parse_obj_header_at() for efficient memory-based scanning.
Verification: notes/pdftract-5upi.md
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implement TH-07 password ingress channels for CLI:
- --password-stdin flag (reads one line from stdin)
- PDFTRACT_PASSWORD env var
- --password VALUE (rejected unless PDFTRACT_INSECURE_CLI_PASSWORD=1)
Exit code 64 for insecure password usage with stderr hint.
Stderr warning emitted when --password VALUE accepted via opt-in.
Priority order: stdin > env var > value (opt-in) > none.
Empty password (bare newline) treated as no password.
Acceptance criteria:
- --password-stdin: PASS
- PDFTRACT_PASSWORD: PASS
- --password VALUE rejection (exit 64): PASS
- Stderr warning on opt-in: PASS
- Exit codes: PASS
- Python/MCP/Serve: N/A (crates don't exist yet)
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
Add two proptests for the PDF hex string lexer to verify robustness
and correctness:
1. proptest_hex_string_never_panics_on_random_bytes: Random byte
sequences starting with '<' (not '<<') never cause panics.
2. proptest_hex_string_roundtrip_via_reencode: Hex decode + re-encode
roundtrip property validates that encoding and decoding are
inverse operations.
The hex string lexer implementation was already present and correct,
with proper handling of odd-length zero padding (<4> -> \x40, not \x04).
All acceptance criteria pass:
- Empty hex string: <> -> b""
- Odd-length single nibble: <4> -> b"\x40" (critical test)
- Standard decoding: <48656C6C6F> -> b"Hello"
- Mixed case: <aBcD> -> b"\xAB\xCD"
- Whitespace ignored: <48 65> -> b"\x48\x65"
- Unterminated with diagnostic: <48 -> b"\x48" + STRUCT_UNTERMINATED_STRING
- Proptests pass: random bytes never panic, roundtrip property holds
- INV-8 maintained: all error paths use diagnostics, no panics
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Rename all DiagCode enum variants in the lexer to use the STRUCT_ prefix
to match the specification. This clarifies that these diagnostics relate
to structural/lexical issues in PDF documents.
Changes:
- InvalidName -> StructInvalidName
- InvalidHex -> StructInvalidHex
- InvalidOctal -> StructInvalidOctal
- InvalidStreamHeader -> StructInvalidStreamHeader
- UnexpectedEof -> StructUnexpectedEof
- UnterminatedString -> StructUnterminatedString
The hex string lexer implementation was already correct, with proper
handling of:
- Hex digit pair decoding
- Embedded whitespace (PDF spec 7.2.2)
- Odd-length zero padding: <4> -> \x40 (dangling nibble is HIGH)
- Invalid character diagnostics
- Unterminated string diagnostics
All 16 hex string tests pass, including critical tests for odd-length
padding and error handling.
See: notes/pdftract-2hm4.md
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add verify_receipt method support to Go templates:
- client.go.tera: Add verify_receipt with string params (path, receipt)
- conformance_test.go.tera: Add testVerifyReceipt test case
Code generator cleanup:
- Add uses_string_params and string_param_count to Method struct
- Fix unused variable warnings in contract parsing
- Document TODO for full markdown contract parsing
Verification:
- All 9 methods generated correctly (extract, extract_text, extract_markdown, extract_stream, search, get_metadata, hash, classify, verify_receipt)
- All 7 error types generated with exit code mapping
- Drift detection working (validate command)
- Protection against overwriting hand-written code (GENERATED marker)
See notes/pdftract-1534.md for full acceptance criteria status.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-1534
Add verify_receipt method support to Go templates:
- client.go.tera: Add verify_receipt with string params (path, receipt)
- conformance_test.go.tera: Add testVerifyReceipt test case
Code generator cleanup:
- Add uses_string_params and string_param_count to Method struct
- Fix unused variable warnings in contract parsing
- Document TODO for full markdown contract parsing
Verification:
- All 9 methods generated correctly (extract, extract_text, extract_markdown, extract_stream, search, get_metadata, hash, classify, verify_receipt)
- All 7 error types generated with exit code mapping
- Drift detection working (validate command)
- Protection against overwriting hand-written code (GENERATED marker)
See notes/pdftract-1534.md for full acceptance criteria status.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Two fixes:
1. Hex string lexer now flushes dangling nibble when encountering invalid
characters. For `<4X8Y>`, the X and Y are invalid, so we flush nibble 4
as 0x40, then flush nibble 8 as 0x80, producing `\x40\x80`.
2. Fixed skip_whitespace_and_comments() to properly handle whitespace
after comments. The previous logic only continued looping if the next
byte was `%`, missing cases where whitespace follows a comment.
All 52 lexer tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implements the conformance test runner pattern for all 10 SDKs as specified
in the plan (line 3547). Each SDK now has a dedicated conformance test runner.
Created:
- tests/sdk-conformance/report-schema.json: JSON schema for conformance reports
- docs/notes/sdk-conformance-runner.md: Pattern documentation and reference
- crates/pdftract-cli/tests/conformance.rs: Rust cargo test target
- tests/conformance/test_conformance.py: Python pytest harness
- tests/conformance/conformance.test.ts: Node.js vitest runner
- tests/conformance/conformance_test.go: Go go test runner
- tests/conformance/ConformanceTest.java: Java JUnit 5 runner
- tests/conformance/ConformanceTests.cs: .NET xUnit runner
- tests/conformance/conformance.c: C standalone binary
- tests/conformance/conformance_test.rb: Ruby minitest runner
- tests/conformance/ConformanceTest.php: PHP PHPUnit runner
- tests/conformance/ConformanceTests.swift: Swift XCTest runner
All runners implement:
- Loading of tests/sdk-conformance/cases.json
- Execution of test cases with language-native method invocations
- Comparison of results against expected values with numeric tolerances
- Emission of machine-readable conformance-report.json
- Non-zero exit on failures/errors for CI gating
Acceptance criteria:
- PASS: All 10 SDKs have language-specific runners
- PASS: Runners consume shared cases.json
- PASS: Runners emit JSON reports matching schema
- PASS: Runners exit non-zero on failure
- WARN: README integration pending SDK repo creation
- WARN: Stub implementations return placeholder results
References:
- Plan line 3547: "Every SDK has a pdftract-sdk-conformance test runner"
- Plan line 3589: "Conformance suite results published as Argo artifact"
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-5omc
Implement the conformance test runner pattern that every SDK will
implement to validate against the shared test suite.
- Rust reference implementation (crates/pdftract-core/tests/conformance.rs)
* Full test suite loader and executor
* Comparison engine with min/max, string constraints, tolerances
* Skip logic for unsupported features and schema versions
* Report generation in JSON format
- CLI compare subcommand (crates/pdftract-cli/src/main.rs)
* pdftract compare - Compare actual vs expected with tolerances
* Cross-language comparison tool to avoid reimplementations
- Documentation (docs/conformance/sdk-contract.md)
* Complete pattern specification with pseudocode
* Per-language runner locations
* CI integration requirements
- Python reference stub (tests/python-conformance/test_conformance.py)
* Full pytest-based implementation following the pattern
Closes: pdftract-5omc
Changes:
- Use pdftract-test-glibc:1.78 image (has aws/b2 CLI preinstalled)
- Use b2-readonly secret instead of armor-secrets
- Update env var names to ARMOR_ACCESS_KEY_ID/ARMOR_SECRET_ACCESS_KEY
- Remove apt-get install step (tools already in image)
The cer-diff tool was already implemented in a previous commit.
This commit fixes the image and secret references per the bead spec.
References pdftract-2t9 acceptance criteria:
- regression-corpus step runs on every PR (✓ already in workflow)
- Uses pdftract-test-glibc:1.78 image (✓ fixed)
- Uses b2-readonly secret (✓ fixed)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Implement Merkle SHA-256 fingerprint algorithm for PDF structural
fingerprinting as specified in Phase 1.7 of the plan.
Components:
- FingerprintInput struct with page data and catalog flags
- Per-page hashing: content streams (normalized), resources (sorted),
geometry (4dp banker's rounding)
- Structure tree hash for tagged PDFs
- Catalog feature flag byte (encryption, JS, XFA, OCG)
Acceptance criteria:
- INV-3: 100% reproducible fingerprints (test passes)
- INV-13: Output format ^pdftract-v1:[0-9a-f]{64}$ (test passes)
- Performance: 100-page PDF in < 1ms (test passes)
- KU-7: WARN - no linearized fixtures available
Closes pdftract-q15sh
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add test_cycle_detection_in_page_tree to verify that circular references
in the /Pages tree are detected and handled gracefully without panicking.
The test creates a page tree with a cycle (parent -> child1 -> child2 -> child1)
and verifies that the flattener returns the valid pages while pruning the
cyclic portion.
Acceptance criteria verified:
- 3-level /Pages inheritance with MediaBox: PASS
- EC-09 missing MediaBox defaults to US Letter: PASS
- /Pages tree with cycles detected: PASS
- /Rotate value 45 clamped to 0: PASS
- Page count validation: PASS
- proptest random shapes never panic: PASS
- INV-8 no panics on invalid input: PASS
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-5tmcg
Bead-Id: pdftract-4iier
- Remove incorrect #[cfg(feature = "proptest")] since proptest is not behind a feature
- Update verification note to reflect 30 passing tests (includes 2 proptest tests)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Fix stream.rs test cases to use PdfStream::new() correctly (takes PdfDict directly, not wrapped in PdfObject::Dict)
- Fix catalog.rs test cases to use PdfObject::Dict(Box::new(dict)) (API change)
- Update parse_catalog to return Ok(empty_catalog) with STRUCT_MISSING_KEY diagnostic instead of Err when /Pages is missing (per bead acceptance criteria)
All catalog parser tests pass:
- 27 tests including 6 proptests for INV-8 compliance
- PageLabels number tree with mixed roman/arabic styles
- Tagged PDF detection via /MarkInfo
- Optional fields (Outlines, Version, etc.)
- proptest: random PdfObject as /Root never panics
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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>
Changed Diagnostic::msg from String to Cow<'static, str> to avoid
allocations for static error messages. Static messages now use
Cow::Borrowed, while dynamic formatted messages use Cow::Owned.
Also fixed peek_token lifetime issue - was returning reference to
local variable, now returns reference from cache.
Acceptance criteria:
- Token enum with all required variants
- Lexer struct with position tracking and diagnostics
- Diagnostic uses Cow<'static, str> for zero-allocation static messages
- All public methods implemented: new, next_token, peek_token, position, take_diagnostics
- All internal helpers implemented
Refs: pdftract-4hn1
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-4hn1
