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Implement native DAT container codec

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gamer147
2026-07-24 14:00:33 -04:00
parent 15f23abf5c
commit 6ffd21cd3e
10 changed files with 856 additions and 5 deletions
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docs/engine-re.md
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@@ -1722,6 +1722,16 @@ inventing a second save container.
a profile/save service so extended mode can later add JSON inspection/export, namespaced mod state, migrations,
or a friendlier editor without changing compatibility-mode opcode semantics or the native import/export path.
**Port correspondence (2026-07-24, codec foundation implemented):**
`Age.Engine.Persistence.NativeSaveContainerCodec` now reads and writes the common header, Shift-JIS game id,
SYSTEMTIME/playtime/version metadata, both CRC layers, version-2 compression wrapper, and exact reversible
DWORD transform. `Sys4.LzssEncoder` emits the same 4 KiB-ring token dialect already consumed by
`LzssDecoder`, falling back to native verbatim storage when compression does not shrink. The
`INativeDatStore` boundary and `DirectoryNativeDatStore` own shared `$$SAVE.DAT` → `SAVE.DAT` /
`SAVE.BAK` replacement/fallback and direct numbered `SAVE##.DAT` writes. Payload schemas, `RT.DAT`,
thumbnails, and opcode wiring remain deliberately above or after this layer; the existing `GameSession`
JSON snapshot is unchanged.
### Opcode `0xae` continues numbered-save stack restoration (2026-07-20)
Opcode `0xae` is the load-side rendezvous paired with serialized script-frame state. Its handler,