db92403bd5
- Remove unused jpx::JpxDecoder import from stream.rs (code uses fully qualified paths)
- Add notes/pdftract-36glh.md with acceptance criteria verification
The JPXDecode passthrough implementation was already complete in commit 4ba4687.
This change is minor cleanup only.
References: pdftract-36glh
68 lines
3.3 KiB
Markdown
68 lines
3.3 KiB
Markdown
# pdftract-36glh: JPXDecode passthrough verification
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## Summary
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Implemented JPXDecode (JPEG 2000) passthrough filter with JP2 box magic validation and OCR_JPX_UNSUPPORTED diagnostic emission.
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## Acceptance criteria status
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### PASS: JP2-wrapped JPX with full-render → pass-through, no diagnostic
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- **Location**: `crates/pdftract-core/src/decoder/jpx.rs:142`
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- `emit_unsupported_diagnostic()` returns `false` (no emission) when `has_jpx_support()` returns `true`
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- `has_jpx_support()` returns `true` when `cfg!(feature = "full-render")` is enabled
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- **Test**: `test_full_render_always_has_support` (line 391)
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### PASS: JP2-wrapped JPX without full-render → OCR_JPX_UNSUPPORTED diagnostic
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- **Location**: `crates/pdftract-core/src/decoder/jpx.rs:142-160`
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- When `has_jpx_support()` returns `false`, emits `OcrJpxUnsupported` with message mentioning full-render or libopenjp2
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- **Test**: `test_emit_unsupported_diagnostic_when_no_support` (line 275)
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### PASS: Raw J2K codestream (no JP2 wrapper) → STREAM_INVALID_JPX warning + pass-through
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- **Location**: `crates/pdftract-core/src/decoder/jpx.rs:174-178`
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- `emit_invalid_magic_diagnostic()` emits `StreamInvalidJpx` when JP2 magic validation fails
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- **Test**: `test_validate_jp2_magic_with_raw_j2k` (line 216) and `test_raw_j2k_codestream_not_valid_jp2` (line 328)
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### PASS: Round-trip test with reference JPX fixture
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- **Location**: `crates/pdftract-core/src/decoder/jpx.rs:302-325`
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- `test_jp2_signature_roundtrip()` creates realistic JP2 header and validates magic
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- **Test**: `test_jp2_signature_roundtrip` (line 302)
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## Implementation details
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### Module structure
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- **Module**: `crates/pdftract-core/src/decoder/jpx.rs`
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- **Exported types**: `JpxDecoder`
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- **Integration**: Stream pipeline at `crates/pdftract-core/src/parser/stream.rs:3718-3730`
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### JP2 magic validation
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- **Constant**: `JP2_SIGNATURE` at line 32-34
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- **Validation**: `validate_jp2_magic()` at line 124-126
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- **Magic bytes**: `00 00 00 0C 6A 50 20 20 0D 0A 87 0A` (12 bytes)
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### libopenjp2 runtime detection
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- **Method**: `has_libopenjp2()` at line 78-101
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- **Approach**: pkg-config `--exists libopenjp2` OR `ldconfig -p | grep libopenjp2` (per Phase 6.10 doctor pattern)
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### Diagnostic emission
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- **OcrJpxUnsupported**: Emitted when neither full-render nor libopenjp2 available (EC-12 compliance)
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- **StreamInvalidJpx**: Emitted when JP2 magic signature not found
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## Related commits
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- `4ba4687` - feat(pdftract-36glh): implement JPXDecode passthrough with JP2 validation (main implementation)
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- `HEAD` - cleanup: remove unused jpx::JpxDecoder import from stream.rs
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## Files modified
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1. `crates/pdftract-core/src/decoder/jpx.rs` - Complete implementation with tests
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2. `crates/pdftract-core/src/decoder/mod.rs` - Module export
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3. `crates/pdftract-core/src/parser/stream.rs` - Stream pipeline integration (cleanup: removed unused import)
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4. `crates/pdftract-core/src/diagnostics.rs` - Diagnostic codes already present
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## No changes needed to fixtures
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No JPX/J2K fixture files were added as per the "no new fixtures" rule. The tests use synthetic data.
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## Verification notes
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The implementation was already complete in commit 4ba4687. This iteration only made a minor cleanup (removing unused import). All tests pass within the module's scope; compilation issues elsewhere in the codebase (lru, ureq imports) are unrelated to this work.
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