# bf-54x8x: no-mapping.pdf Fixture Documentation

## Task Completed

Documented the no-mapping.pdf fixture structure and regeneration process.

## Summary

The no-mapping.pdf fixture documentation was already comprehensive and complete. Both documentation files exist with all required information:

### Files Verified

1. **`tests/fixtures/no-mapping.md`** (452 lines)
   - Complete fixture structure documentation
   - PDF properties, font analysis, content stream analysis
   - Raw PDF structure with all 5 objects
   - Regeneration instructions (Python + manual)
   - Inspection commands and verification steps
   - Test coverage and troubleshooting guide

2. **`tests/fixtures/encoding/no-mapping.md`** (203 lines)
   - Encoding-specific fixture documentation
   - Purpose and expected behavior (Level 4 Unicode recovery)
   - Font details and encoding dictionary
   - Regeneration instructions with examples
   - Verification and test references

### Fixture Integrity Verified

```bash
$ sha256sum tests/fixtures/encoding/no-mapping.pdf
b24f88d3add958bfec1d6b134f2cd030cd41bb1932bedbe99405599bd01fa8f0  tests/fixtures/encoding/no-mapping.pdf
```

Matches documented SHA256 in both files.

### PDF Structure Confirmed

```bash
$ pdfinfo tests/fixtures/encoding/no-mapping.pdf
Pages:           1
Page size:       612 x 792 pts (letter)
File size:       660 bytes
PDF version:     1.4

$ pdffonts tests/fixtures/encoding/no-mapping.pdf
name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
CustomNoMap                          Type 1            Custom           no  no  no       5  0
```

### Ground Truth Verified

```bash
$ hexdump -C tests/fixtures/encoding/no-mapping.txt
00000000  ef bf bd ef bf bd ef bf  bd ef bf bd 0a ef bf bd  |................|
00000010  ef bf bd                                          |...|
```

Content: ���\n�� (4 U+FFFD + newline + 2 U+FFFD)

### Regeneration Process

**Primary method:**
```bash
python3 tools/generate_encoding_fixtures.py
```

**Manual method:** Complete raw PDF structure provided in documentation files.

## Acceptance Criteria Status

- ✅ tests/fixtures/no-mapping.md includes fixture structure section
- ✅ Regeneration instructions are complete and reproducible
- ✅ Includes example commands for pdfinfo/pdffonts inspection

## References

- Plan: docs/plan/plan.md (lines 1420-1650 - Phase 2.3 Unicode recovery)
- Related: TH-03 encoding recovery tests
- Generator: tools/generate_encoding_fixtures.py

## Conclusion

The fixture documentation is complete, accurate, and ready for use. All acceptance criteria have been met.