# bf-ttbb5: Verification of no-mapping.pdf Generation

**Date:** 2026-07-03
**Parent Bead:** bf-1m30m
**Task:** Verify and run no-mapping.pdf generation scripts

## Execution Summary

Successfully executed the Rust generation binary `generate_unicode_recovery_fixtures_bin` in the encoding fixtures directory.

## Command Executed

```bash
cd tests/fixtures/encoding && ./generate_unicode_recovery_fixtures_bin
```

## Output

```
Generating Unicode recovery test fixtures...
  Generating no-mapping.pdf...
    -> no-mapping.pdf (expect: <U+FFFD><U+FFFD><U+FFFD>)
  Generating agl-only.pdf...
    -> agl-only.pdf (expect: Hello\nWorld)
  Generating fingerprint-match.pdf...
    -> fingerprint-match.pdf (expect: Test)
  Generating shape-match.pdf...
    -> shape-match.pdf (expect: S)

✓ All fixtures generated successfully!
```

## Verification Results

### File Creation
- **no-mapping.pdf**: 650 bytes ✓
- **no-mapping.txt**: 9 bytes (pre-existing ground truth) ✓

### PDF Structure Validation
- **Header**: Valid %PDF-1.4 ✓
- **Font**: `/CustomNoMap` (Type1, not standard 14) ✓
- **Encoding**: Custom `/Differences [0 /g001 /g002 /g003]` ✓
- **Glyph Names**: Non-AGL names `/g001`, `/g002`, `/g003` ✓
- **ToUnicode**: Absent (as required for ENCODING_NO_MAPPING test) ✓
- **Trailer**: Valid with %%EOF marker ✓

### Ground Truth Validation
- **Content**: Three U+FFFD replacement characters (0xEF 0xBF 0xBD × 3) ✓
- **Expected**: `<U+FFFD><U+FFFD><U+FFFD>` (as documented in bf-f0xqd-research.md) ✓

## Technical Details

The generated fixture correctly implements the ENCODING_NO_MAPPING failure mode:
- Level 1 recovery fails: No standard encoding (WinAnsi/MacRoman/Standard)
- Level 2 recovery fails: Glyph names not in Adobe Glyph List (AGL)
- Level 3 recovery fails: No embedded font program for fingerprinting
- Level 4 recovery: Expected to emit U+FFFD × 3 with GLYPH_UNMAPPED diagnostic

## Artifacts Produced

- `tests/fixtures/encoding/no-mapping.pdf` - Main fixture
- `tests/fixtures/encoding/no-mapping.txt` - Ground truth (pre-existing)
- `tests/fixtures/encoding/agl-only.pdf` - Generated alongside
- `tests/fixtures/encoding/fingerprint-match.pdf` - Generated alongside
- `tests/fixtures/encoding/shape-match.pdf` - Generated alongside

## References

- Research document: notes/bf-f0xqd-research.md (sections 4.4, 9)
- Generation script: tests/fixtures/encoding/generate_unicode_recovery_fixtures.rs
- Binary: tests/fixtures/encoding/generate_unicode_recovery_fixtures_bin

## Conclusion

**Status**: COMPLETE ✓

The generation script executed without errors and produced a valid no-mapping.pdf fixture that meets all acceptance criteria:
- ✓ Script executed successfully
- ✓ No errors during execution
- ✓ no-mapping.pdf created in encoding fixtures directory
- ✓ PDF structure validated (custom encoding, non-AGL glyphs, no ToUnicode)
- ✓ Ground truth file contains expected U+FFFD × 3