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# appledouble
AppleSingle/AppleDouble container codec: exhaustive parse, lossless build.
Extracted from [ad-decoder] as a shared crate. Entries decode into a
`BTreeMap<u32, Vec<u8>>` with typed views over Real Name (3), Comment (4),
File Dates (8), Finder Info (9), and Macintosh File Info (10) — everything
else is preserved as raw bytes, so parse → build round trips are lossless
even for entry types this crate has no opinion about. The macOS `ATTR`
extension (arbitrary xattrs packed after Finder Info) is parsed and rebuilt.
Consumers:
- **ad-decoder** — assertive (non-obliterative) sidecar folding onto APFS
- **adx** — AS/AD inspection and editing
- **fsinspect** — FUSE-side AppleDouble synthesis for Linux EA recovery
[ad-decoder]: https://code.movq.us/movq/ad-decoder