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

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
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

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

Matches documented SHA256 in both files.

PDF Structure Confirmed

$ 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

$ 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: <20><><EFBFBD>\n<><6E> (4 U+FFFD + newline + 2 U+FFFD)

Regeneration Process

Primary method:

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.

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