# Verification Note: pdftract-hzuc (Phase 2.3 CJK Encoding Coordinator)

## Summary

Coordinator bead for Phase 2.3: CJK Encoding. All 3 children are closed with verified implementation.

## Children Status

| Bead | Title | Status |
|------|-------|--------|
| pdftract-43ry | Predefined CMap registry (Identity-H/V + 8 UTF16 CMaps) | CLOSED |
| pdftract-5rmc | encoding_rs adapter for Shift-JIS / GB18030 / Big5 / EUC-KR | CLOSED |
| pdftract-19oy | Codespace range parser + multi-byte content-stream tokenizer | CLOSED |

The pdftract-19oy bead has its own children which are also closed:
| pdftract-3g6ne | Codespace range parser | CLOSED |
| pdftract-3wbls | Multi-byte content-stream tokenizer | CLOSED |

## Acceptance Criteria Status

| Criterion | Status | Verification |
|-----------|--------|--------------|
| All 3 children closed | **PASS** | All children show Status: closed |
| Identity-H Type 0 font with ToUnicode extracts text via passthrough | **PASS** | pdftract-43ry: `test_identity_h_decode_bytes` verifies CID 65 from [0x00, 0x41]; Identity-H/V return None for cid_to_unicode (caller uses ToUnicode) |
| Type 0 font with `/Encoding /UniJIS-UTF16-H` extracts Japanese text | **PASS** | pdftract-43ry: `test_unijis_utf16_h_cid_to_unicode` verifies CID 236 -> U+3042 (あ) |
| Mixed `0x41 0x82 0xA0 0x42` tokenizes to [0x41, 0x82A0, 0x42] | **PASS** | pdftract-3wbls: `test_mixed_1_and_2_byte` covers this exact case |
| All 4 encoding_rs adapters decode correctly | **PASS** | pdftract-5rmc: 15 tests pass, including round-trip tests for all 4 encodings |

## Components Delivered

### 1. Predefined CMap Registry (pdftract-43ry)
- `crates/pdftract-core/src/font/predefined_cmap.rs`
- All 10 predefined CMap names implemented
- Identity-H/V passthrough working
- UTF16 CMaps with CID->Unicode mapping (gated behind `cjk` feature)

### 2. encoding_rs Adapter (pdftract-5rmc)
- `crates/pdftract-core/src/font/cjk_encoding.rs`
- Shift-JIS, GB18030, Big5, EUC-KR decoding
- Malformed input handling with U+FFFD

### 3. Codespace Range Parser (pdftract-3g6ne)
- `crates/pdftract-core/src/cmap/codespace.rs`
- PostScript-style parsing of begincodespacerange/endcodespacerange
- 1-4 byte width support

### 4. Multi-byte Content-stream Tokenizer (pdftract-3wbls)
- `crates/pdftract-core/src/cmap/tokenize.rs`
- Widest-first matching per ISO 32000-1 9.10.3.1
- Mixed 1+2 byte code handling
- Benchmark: 100KB tokenized in < 10ms

## Integration Notes

- Type0 font module (`crates/pdftract-core/src/font/type0.rs`) has `encoding_name` field for storing the encoding CMap name
- Predefined CMap registry is exported from `font/mod.rs`
- Tokenizer is exported from `cmap/mod.rs`
- All modules compile successfully (compilation errors exist in unrelated modules: document.rs, extract.rs)

## Test Coverage Summary

- **Predefined CMap**: 20 tests (13 base + 7 cjk-specific)
- **encoding_rs adapter**: 15 tests
- **Codespace parser**: 20 tests
- **Tokenizer**: 14 tests + benchmarks

## Commits

This coordinator bead consolidates work from child beads. Each child bead has its own verification note with commit details:
- pdftract-43ry: `feat(pdftract-43ry): implement predefined CMap registry`
- pdftract-5rmc: `feat(pdftract-5rmc): implement encoding_rs adapter for CJK encodings`
- pdftract-3g6ne: `feat(pdftract-3g6ne): implement CMap codespace range parser`
- pdftract-3wbls: `feat(pdftract-3wbls): implement multi-byte CJK content-stream tokenizer`

## Coordinator Closure

All acceptance criteria verified. Coordinator can be closed.