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firestorm/MW4COMPARE/reports/textures-decoded-diff.txt
T
dicionClaude Opus 5GitHub Copilot
 83478b7666 Add MW4COMPARE: .mw4 decompiler toolchain and V4H comparison harness 
Tooling built to recover editable source for six 'Mech chassis that exist
in the parallel FS_Build_V4H build but not in this repo. Reverse-engineers
every compiled record type in the .mw4 package format back to the .data /
.instance / .subsystems / .damage / .contents / .torso / .engine /
.armature sources the content pipeline consumes.

Nothing here is wired into the game build. It is a standalone analysis
harness run from Linux.

Package format
--------------
"#VBD" container. Directory records are [len][name][FILETIME][origSize]
[storedSize][offset], payload base at dword 0x0C. A record is stored raw
when storedSize == origSize, otherwise LZW (9->12-bit LSB-first codes,
256=clear, 257=EOF, dict from 258), per Database.cpp:451.

GameModel records are flat /Zp4 structs following the C++ inheritance
chain Entity(0) -> Mover(28) -> MWObject(80) -> Vehicle(664) -> Mech(756),
1636 bytes total. CreateMessage records follow Replicator -> Entity ->
Mover -> MWMover -> MWObject -> Vehicle -> Mech from start=16 (the
undeclared Connection__Message header), ending at 341 and padded to 344.

tools/decompile/
----------------
  datamap.py        header-driven layout engine; CHAIN + ANCHORS
                    {Vehicle:664, Mech:756} assert the struct offsets
  mw4msg.py         CreateMessage reader/walker
  data.py           .data      constants.py  define/table symbol resolution
  damage.py         .damage    contents.py   .contents
  smallmodel.py     .torso + .engine         instance.py  .instance
  armature.py / armature_parts.py  .armature + armaturedata/armaturevideo
  assembly.py       joint hierarchy renderer
  make_generic_doll.py  builds generic MFD/Radar damage dolls
  verify_*.py       per-type round-trip verifiers

Verified round-trip across all 64 shared chassis:
  .armature      2938/2976 pages     .subsystems  7579/7585 keys
  .data map      6071/6071 values    .data trip   8291/8306 keys
  .damage        6605/6605 keys      .contents    7480/7480 keys
  .torso+.engine 1280/1280 keys      .instance     896/896 keys, 64/64 pages
  armature_parts 1202/1202 .data, 1149/1202 .video

Layout-discovery lessons (documented in DECOMPILING.md)
-------------------------------------------------------
- Never let a field map be discovered by the values that verify it. A
  value-matching pass reported 4288/4288 while mis-assigning 34 keys. The
  map was rebuilt from header declaration order, anchored on uniquely
  resolved fields.
- Read the factory, not the data. 12 .data fields and 5 Torso fields are
  declared plain Stuff::Scalar but multiplied by Radians_Per_Degree in
  Mech_Tool.cpp:889 / Torso_Tool.cpp.
- Strip typedefs before walking a header. A stray `typedef int AttributeID;`
  masked a missing ClassID - two 4-byte errors cancelling out, caught only
  by the ANCHORS assertion.
- A verifier that silently narrows its own input reports success. Braced
  blocks must be hidden before splitting pages, replacing both CR and LF,
  because a `Shadow={...}` block contains a line reading `[shadow]` and
  splitlines() also splits on bare CR.
- NSWIZZLE is undefined, so the #else branch is live and orders members
  differently. bool is 1 byte; char x[MaxStringLength] is 256.
- V4H carries stale Mech IDs (their Atlas is 5, ours 6), so 64 of 65 shared
  chassis are off by one; --retarget-ids emits $(M_<Chassis>)/$(IDS_<Chassis>).

reports/ holds generated diffs. The two ~5 MB manifest-*.tsv intermediates
are gitignored; regenerate everything with run-comparison.sh.

Co-authored-by: Claude Opus 5 (Anthropic) <noreply@anthropic.com>
Co-authored-by: GitHub Copilot <copilot@github.com>
2026-08-08 16:47:57 -05:00

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# entries: A=10419 B=10120 A_only=299 B_only=0 decoded-differ=1
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+A mechs/champion/chp_hip_dam.erf 6655B
+A mechs/champion/chp_lbtoe.erf 1211B
+A mechs/champion/chp_lbtoe_dam.erf 1211B
+A mechs/champion/chp_ldleg.erf 8372B
+A mechs/champion/chp_ldleg_dam.erf 8372B
+A mechs/champion/chp_lfoot.erf 2017B
+A mechs/champion/chp_lfoot_dam.erf 2017B
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+A mechs/champion/chp_lftoe_dam.erf 2309B
+A mechs/champion/chp_lgun.erf 8328B
+A mechs/champion/chp_luarm.erf 853B
+A mechs/champion/chp_luarm_dam.erf 853B
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+A mechs/champion/chp_luleg_dam.erf 10067B
+A mechs/champion/chp_rbtoe.erf 1211B
+A mechs/champion/chp_rbtoe_dam.erf 1211B
+A mechs/champion/chp_rdleg.erf 8372B
+A mechs/champion/chp_rdleg_dam.erf 8372B
+A mechs/champion/chp_rfoot.erf 2017B
+A mechs/champion/chp_rfoot_dam.erf 2017B
+A mechs/champion/chp_rftoe.erf 2309B
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+A mechs/jenner2c/jec_luleg.erf 13003B
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+A mechs/jenner2c/jec_rbtoe.erf 3191B
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+A mechs/jenner2c/jec_rfoot_dam.erf 2667B
+A mechs/jenner2c/jec_rftoe.erf 3599B
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+A mechs/marauder/runninglights.erf 541B
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+A mechs/thunderbolt/thu_rftoe_dam.erf 2555B
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+A mechs/thunderbolt/thu_torso_dam.erf 12695B
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+A textures/footsteps/thunderbolt_snow.tga{hint} 4B
~ textures/stockdecals/decal_49.tga A=16428B B=16428B
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