dc3de9dbc4
Route-A investigation of the defaulted-field hunt: mapped the generic IDXD reflective serializer (IdxdLoad_Dispatch/Idxd_Parse/ Reflect_FindFieldIndex/Reflect_SetField + g_FieldNameRegistry) and the global name-vector. Established that Idxd_Parse only writes fields present in the pool; defaults come from each type's constructor via the reflection registry. Quantified the gap (534 craft: 30-70% of core stats defaulted) and documented the two finish routes (static constructor reversal vs. runtime registry dump). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
122 lines
8.5 KiB
Markdown
122 lines
8.5 KiB
Markdown
# Project Sylpheed — reverse-engineered symbol map
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Durable record of guest functions/data in the retail title (`default.xex`,
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base `0x82000000`) that have been positively identified by RE. Addresses are
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guest virtual addresses. This is the source of truth for names; the DuckDB
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`sylpheed.db` (this dir) `functions.name` column can be re-stamped from here
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with `apply_re_symbols.sql` (names are wiped on a full DB regen).
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Confidence: **H** = behaviour proven (reproduced/verified against data), **M** =
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strongly inferred from disassembly, **L** = tentative.
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## Archive (IPFB `.pak`) subsystem
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| Address | Name | Conf | Description |
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|---|---|---|---|
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| `0x824609C8` | `Pak_FindEntryByName` | H | Look up a TOC entry by path. Args `(r3 = pak object, r4 = char* path)`. Calls `Pak_HashPathName(path)`, then binary-searches the sorted 12-byte TOC (base `pak+4`, count `pak+8`, stride 12; compares the 32-bit `name_hash`). Returns the matching record pointer or 0. |
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| `0x82460928` | `Pak_HashPathName` | H | Duplicate `r3 = char* path`, lowercase it in place (`Str_ToLowerAscii`), hash with `Sylph_NameHash`, free the copy, return the 32-bit hash. This is the path→key bridge. |
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| `0x82455C78` | `Sylph_NameHash` | H | The IPFB TOC / cache-path name-hash. See [Name-hash](#name-hash-sylph_namehash). Input must already be lowercased. `r3 = char*` → `r3 = u32 hash`. |
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| `0x825F4F90` | `Str_ToLowerAscii` | H | In-place ASCII lowercase (`A`–`Z` → `+0x20`); other bytes pass through. `r3 = char*`. (When `r3 == 0` it takes an unrelated init branch.) |
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| `0x824607B0` | `Pak_IsIPFBHeader` | H | Validate an IPFB header. Loads the header's first word and checks it equals `"IPFB"` (`0x49504642`) via a delta trick: `first_word - 0x49504620 == 0x22` (`'B' - ' '`). `r5 = header ptr`. Returns bool-ish in `r3`. |
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| `0x82460AD0`… | *(pak header parse, unregistered container)* | M | The pak-open/validate path around `0x82460DC0`–`0x82460EC4` builds an expected-header template (`"IPFB"`, `0x10000000` flags) on the stack and calls `Pak_IsIPFBHeader`. Function-boundary detection missed the enclosing frame (entry ≈ `0x82460E34`). |
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| `0x82458508` | `Archive_StreamReadCrc32` | M | Streaming block reader that validates content with a reflected CRC-32 (init `0xFFFFFFFF`, final `~`, table at `g_Crc32Table`). Compares the computed CRC to a stored expected value (`state+144`). This is a **content-integrity** CRC, *not* the name-hash. |
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| `0x828992F0` | `g_Crc32Table` (data) | H | 256-entry reflected CRC-32 lookup table. Referenced only by `Archive_StreamReadCrc32` and its sibling loop at `0x82457AF8`. |
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## IDXD reflective serialization framework
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Generic tagged-object (de)serializer shared by ~15 object families (craft,
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weapon, message/character, effects, …). The `.pak` IDXD payloads are read
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through this.
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| Address | Name | Conf | Description |
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|---|---|---|---|
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| `0x824486C0` | `IdxdLoad_Dispatch` | M | Entry: reads the magic and dispatches across variants `IDXD` (`0x49445844`), `IDX2`, `IDX3`, `IDXC`, `IXUD` → the matching parser. **15 callers** (one per object family). The target object is passed in `r3` — already constructed (defaults set) by the caller. |
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| `0x82448D00` | `IdxdLoad_Variant2` | M | Sibling variant loader (also materializes the `IDXD` magic). |
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| `0x82449640` | `Idxd_Parse` | M | The IDXD body parser: skips a BOM, then loops the string pool — per field, reads the name token, `Reflect_FindFieldIndex`, then dispatches on the **value's first char** (jump table at `0x824497F8`, index `firstchar - 0x22`) to type-specific writers. Only fields **present** in the pool are written. |
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| `0x8244A2F0` | `Reflect_FindFieldIndex` | M | Look up a field-name string in a global name-vector at `0x820B4F18` (std::vector-like: count `+20`, data `+24`/SSO), via a `strncmp`-style compare (`0x825EDCE0`). Returns index or `-1`. |
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| `0x8244A4B0` | `Reflect_SetField` | L | Apply a value to `object` using its per-instance property registry at `object+64` and a config string at `0x820B4F28`. |
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| `0x820B4F18` | `g_FieldNameRegistry` (data) | L | Global reflection name-vector (runtime-built) used by `Reflect_FindFieldIndex`. |
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**Defaulted fields:** a field is written to the IDXD pool only when it differs
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from its default, so `Idxd_Parse` never sets defaulted fields — their values are
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established by each **type's constructor** (in the 15 `IdxdLoad_Dispatch`
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callers) before load, via this same registry. Recovering them statically means
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reversing those constructors and joining `field-name → struct-offset →
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default-store`; a runtime dump of a loaded object's registry gives
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`name → value` directly. (Open — see below.)
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## 3D resource subsystem
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| Address | Name | Conf | Description |
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|---|---|---|---|
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| `0x82640290` | `Res3D_LoadMeshChunk` | L | 3D-resource loader: walks 12-byte records, checks chunk tags (`0x1A22AA26`, `0x2DA2AA24`), and copies `float` triples (x/y/z vertices) via `lfs`/`stfs`. Part of the DefTables/`machines\<model>\…` mesh path. |
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## Name-hash (`Sylph_NameHash`)
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Per-byte Barrett-reduced polynomial hash over the **lowercased** name:
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```
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A = 0 ; B = 0
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for each (sign-extended) byte c of the lowercased name:
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A = (A << 8) + c # 32-bit
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A = A - (((A * 0x8003_1493) >> 32) rol 9 & 0x1FF) * 0x00FF_F9D7 # A mod 0x00FF_F9D7 (no final fixup)
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B = B + c
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hash = ((B & 0xFF) << 24) | (A & 0x00FF_FFFF)
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```
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- Modulus `0x00FF_F9D7`, reciprocal `0x8003_1493` (the `mulhwu`/`mullw` Barrett step).
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- Low 24 bits = modular polynomial hash; top byte = 8-bit additive checksum of the bytes.
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- No trailing conditional subtract — the value is defined by the exact op sequence.
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- Faithful Rust reproduction: `sylpheed-formats/src/hash.rs` (`name_hash`).
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**Verified** against retail TOCs: `name_hash("files.tbl") == 0x8342_1153`,
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`name_hash("eng\\weapon.tbl") == 0x900C_8DCD`, `name_hash("eng\\strings.tbl") == 0x10C8_0B87`,
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`name_hash("jpn\\weapon.tbl") == 0x9E85_FEFF`.
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## TOC key path conventions (preimages)
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The 32-bit TOC key is `name_hash` of a **backslash** path with the entry's
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internal identity string. Confirmed schemes:
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| Scheme | Example | Where |
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|---|---|---|
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| `unit\<ID>.tbl` | `unit\UN_f001_TCAF_DeltaSaber_T_EX5.tbl` → `0x7C96296C` | craft/ship entries in `GP_MAIN_GAME_*.pak` |
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| `weapon\<ID>.tbl` | `weapon\Weapon_DSaber_P_wep_26_Missile.tbl` | weapon entries |
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| `message\<ID>.tbl` | `message\CharacterCARL.tbl` | character/dialog entries |
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| `effect\<ID>.tbl` | — | effect definitions |
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| `<lang>\<name>.tbl` | `eng\weapon.tbl`, `jpn\strings.tbl` | localized loadout/text tables |
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| `<name>.tbl` | `files.tbl` | root manifest / DefTables resource entries |
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`<ID>` = the entry's internal `ID` field (IDXD string pool). Craft/weapon
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entries also self-describe by content, so stats are readable without the key.
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Coverage with these schemes (IDXD entries, whole-pool ID extraction):
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GP_MAIN_GAME_E 308/1004 (≈31%), DefTables 804/1425 (≈56%). Shipped in
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`sylpheed-formats` (`hash::recover_toc_name`, `pak list` prints resolved
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paths). The unresolved remainder use deeper cross-referenced directory
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paths (e.g. per-mission dialog `MSG_*` entries) — a later hunt, not an
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extraction limit.
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## Open threads
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- **Defaulted IDXD fields.** A field is omitted from the pool exactly when it
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equals the schema default, so present values are all *overrides* and the
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defaults cannot be inferred from them. Gap is large: across the 534 craft
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(`schema 0x43FAA517`) entries, explicit-presence is `Acceleration` 42%,
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`MaximumVelocity` 51%, `Turn_AngularVelocity` 31%, `FCSRange` 34%,
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`ShieldRatio` 49% (`Size_X` 100%, `HP` 85%). So 40–70% of craft rely on
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unknown defaults for core flight/defense stats.
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- Ruled out: the big 16-byte-record binary node table inside a craft IDXD is
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**spatial/mesh data**, not defaults (not keyed by `name_hash(field_key)`).
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- `schema_hash` is **not** a code immediate and **not** `name_hash(typename)`.
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- Defaults are set by each type's **constructor** (one per `IdxdLoad_Dispatch`
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caller) via the reflection registry, not by `Idxd_Parse`.
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- **Two finish routes.** (A, static) reverse the craft constructor: read its
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field registrations (`name → offset`) and default-init stores
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(`offset → value`), join them — heavy, and offset↔name correlation is
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error-prone. (B, runtime) dump a loaded craft object's registry
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(`obj+64`) / struct from xenia-rs or Canary — a fully-loaded craft already
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holds every default; one dump yields `name → value`. **B is the efficient
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finish** given the framework is generic; A's framework map above is the
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prerequisite either way.
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