docs(07-01): complete format spec update plan
- SUMMARY.md with execution metrics and self-check - STATE.md updated: Phase 7 complete, progress 58% - ROADMAP.md: Phase 7 marked complete (1/1 plans) - REQUIREMENTS.md: FMT-09, FMT-10, FMT-11, FMT-12 marked complete Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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.planning/phases/07-format-spec-update/07-01-SUMMARY.md
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---
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phase: 07-format-spec-update
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plan: 01
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subsystem: format
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tags: [binary-format, toc, entry-type, permissions, directory-support]
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# Dependency graph
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requires:
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- phase: 01-format-specification
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provides: "v1.0 FORMAT.md with header, TOC entry, data block definitions and worked example"
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provides:
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- "v1.1 FORMAT.md with entry_type (u8), permissions (u16 LE), relative path semantics"
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- "Updated worked example with 3-entry directory archive (2 dirs + 1 file, 427 bytes)"
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- "Version bumped to 2 with compatibility rules"
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affects: [08-rust-directory-archiver, 09-kotlin-decoder-update, 10-shell-decoder-update, 11-directory-cross-validation]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Directory entries have all-zero crypto fields (iv, hmac, sha256, sizes)"
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- "Parent-before-child ordering in TOC entries"
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- "Entry size formula: 104 + name_length (was 101)"
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key-files:
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created: []
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modified:
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- "docs/FORMAT.md"
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key-decisions:
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- "entry_type and permissions fields placed AFTER name and BEFORE original_size in TOC entry"
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- "Directory entries use zero-filled iv/hmac/sha256 (not omitted) to keep fixed-offset field structure"
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- "v1.0 worked example fully replaced (not kept as subsection) since format version changed"
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patterns-established:
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- "Directory entry pattern: entry_type=0x01, all sizes=0, all crypto=zeroed, no data block"
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- "Permission bits: lower 12 bits of POSIX mode_t stored as u16 LE"
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- "Entry names: relative paths with / separator, no leading /, no .., no trailing /"
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requirements-completed: [FMT-09, FMT-10, FMT-11, FMT-12]
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# Metrics
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duration: 8min
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completed: 2026-02-26
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---
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# Phase 7 Plan 01: Format Spec Update Summary
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**v1.1 FORMAT.md with entry_type (u8) and permissions (u16 LE) fields, relative path semantics, and 427-byte worked example showing nested directory archive**
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## Performance
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- **Duration:** 8 min
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- **Started:** 2026-02-26T18:17:57Z
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- **Completed:** 2026-02-26T18:26:07Z
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- **Tasks:** 2
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- **Files modified:** 1
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## Accomplishments
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- FORMAT.md Section 5 extended with entry_type and permissions fields, Entry Type Values table, Permission Bits Layout table, and Entry Name Semantics subsection
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- Entry size formula updated from 101 to 104 + name_length across all references
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- Format version bumped from 1 to 2 with detailed v2 changes in Version Compatibility section
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- Complete v1.1 worked example: 3 entries (project/src dir, project/src/main.rs file, project/empty dir) with verified 427-byte layout
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- Decode Order of Operations updated for directory handling (check entry_type, mkdir -p, chmod, skip to next entry)
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- Shell decode walkthrough demonstrates both directory creation and file extraction flows
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Update TOC entry definition with entry_type, permissions, and path semantics** - `e7535da` (feat)
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2. **Task 2: Write updated worked example with directory archive** - `37f7dd1` (feat)
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## Files Created/Modified
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- `docs/FORMAT.md` - Complete v1.1 binary format specification with directory support fields and new worked example
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## Decisions Made
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- entry_type and permissions fields placed AFTER name and BEFORE original_size -- maintains variable-length name at the start (name_length prefix still works), new fields are fixed-size and easy to read after name
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- Directory entries use zero-filled crypto fields rather than omitting them -- keeps the entry structure uniform and allows sequential parsing with the same field offsets
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- v1.0 worked example fully replaced rather than kept as a subsection -- the old example uses version=1 and the old entry layout, keeping it would cause confusion
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- Renamed header field from file_count to entry_count -- reflects that directories are now counted
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- FORMAT.md is the normative reference for all three decoders (Rust, Kotlin, Shell)
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- Phase 8 (Rust Directory Archiver) can implement against the new entry_type, permissions, and relative path fields
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- Phases 9 and 10 (Kotlin and Shell decoder updates) have unambiguous field tables and a worked example to test against
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- The 427-byte worked example with verified offsets serves as a golden reference for implementation testing
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## Self-Check: PASSED
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- FOUND: docs/FORMAT.md
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- FOUND: .planning/phases/07-format-spec-update/07-01-SUMMARY.md
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- FOUND: e7535da (Task 1 commit)
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- FOUND: 37f7dd1 (Task 2 commit)
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---
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*Phase: 07-format-spec-update*
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*Completed: 2026-02-26*
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