6c668c7e42
Successfully executed generate_unicode_recovery_fixtures_bin to create no-mapping.pdf fixture (650 bytes). Validated PDF structure includes custom /CustomNoMap font with /Differences encoding, non-AGL glyph names, and no ToUnicode entry. Ground truth contains U+FFFD × 3. Closes bf-ttbb5.
82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
# bf-ttbb5: Verification of no-mapping.pdf Generation
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**Date:** 2026-07-03
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**Parent Bead:** bf-1m30m
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**Task:** Verify and run no-mapping.pdf generation scripts
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## Execution Summary
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Successfully executed the Rust generation binary `generate_unicode_recovery_fixtures_bin` in the encoding fixtures directory.
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## Command Executed
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```bash
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cd tests/fixtures/encoding && ./generate_unicode_recovery_fixtures_bin
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```
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## Output
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```
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Generating Unicode recovery test fixtures...
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Generating no-mapping.pdf...
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-> no-mapping.pdf (expect: <U+FFFD><U+FFFD><U+FFFD>)
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Generating agl-only.pdf...
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-> agl-only.pdf (expect: Hello\nWorld)
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Generating fingerprint-match.pdf...
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-> fingerprint-match.pdf (expect: Test)
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Generating shape-match.pdf...
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-> shape-match.pdf (expect: S)
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✓ All fixtures generated successfully!
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```
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## Verification Results
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### File Creation
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- **no-mapping.pdf**: 650 bytes ✓
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- **no-mapping.txt**: 9 bytes (pre-existing ground truth) ✓
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### PDF Structure Validation
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- **Header**: Valid %PDF-1.4 ✓
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- **Font**: `/CustomNoMap` (Type1, not standard 14) ✓
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- **Encoding**: Custom `/Differences [0 /g001 /g002 /g003]` ✓
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- **Glyph Names**: Non-AGL names `/g001`, `/g002`, `/g003` ✓
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- **ToUnicode**: Absent (as required for ENCODING_NO_MAPPING test) ✓
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- **Trailer**: Valid with %%EOF marker ✓
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### Ground Truth Validation
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- **Content**: Three U+FFFD replacement characters (0xEF 0xBF 0xBD × 3) ✓
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- **Expected**: `<U+FFFD><U+FFFD><U+FFFD>` (as documented in bf-f0xqd-research.md) ✓
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## Technical Details
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The generated fixture correctly implements the ENCODING_NO_MAPPING failure mode:
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- Level 1 recovery fails: No standard encoding (WinAnsi/MacRoman/Standard)
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- Level 2 recovery fails: Glyph names not in Adobe Glyph List (AGL)
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- Level 3 recovery fails: No embedded font program for fingerprinting
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- Level 4 recovery: Expected to emit U+FFFD × 3 with GLYPH_UNMAPPED diagnostic
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## Artifacts Produced
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- `tests/fixtures/encoding/no-mapping.pdf` - Main fixture
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- `tests/fixtures/encoding/no-mapping.txt` - Ground truth (pre-existing)
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- `tests/fixtures/encoding/agl-only.pdf` - Generated alongside
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- `tests/fixtures/encoding/fingerprint-match.pdf` - Generated alongside
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- `tests/fixtures/encoding/shape-match.pdf` - Generated alongside
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## References
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- Research document: notes/bf-f0xqd-research.md (sections 4.4, 9)
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- Generation script: tests/fixtures/encoding/generate_unicode_recovery_fixtures.rs
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- Binary: tests/fixtures/encoding/generate_unicode_recovery_fixtures_bin
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## Conclusion
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**Status**: COMPLETE ✓
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The generation script executed without errors and produced a valid no-mapping.pdf fixture that meets all acceptance criteria:
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- ✓ Script executed successfully
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- ✓ No errors during execution
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- ✓ no-mapping.pdf created in encoding fixtures directory
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- ✓ PDF structure validated (custom encoding, non-AGL glyphs, no ToUnicode)
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- ✓ Ground truth file contains expected U+FFFD × 3
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