CharlesKWON 66882c30bd fix(cdx): Harbour-compatible layout — compound root, RCHB sig, leaf format ...

Align Five's CDX file layout with Harbour's expectations:
- Compound root header at 0, compound leaf at 1024, tags at 1536+
- "RCHB" signature at offset 20 in compound root
- IgnoreCase/collation flags at offset 503-505
- Compound leaf: LeftPtr/RightPtr = 0xFFFFFFFF, recBits=16 fixed
- Tags sorted alphabetically in compound directory B-tree
- Tag IndexOpt: TypeCompact | TypeCompound (0x60)

Status of Harbour cross-read verification:
- CHAR-only CDX tags: layout matches Harbour byte-for-byte
- Numeric tags: Harbour uses IEEE double (8-byte) key encoding,
  Five uses DBF ASCII key bytes — causes DBFCDX/1012 corruption
  when Harbour reads Five-created CDX with numeric tags
- Five reading Harbour CDX: works perfectly (existing)
- Five reading Five CDX: works perfectly

Remaining: numeric key encoding for full Harbour write-compatibility.
CLAUDE.md updated to reflect this single remaining limitation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-14 01:33:52 +09:00

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