83478b7666
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>
83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""Verification harness for the mech .data{GameModel} field map.
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Reads every mapped value through its header-derived offset and compares against
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the source .data, across all 64 chassis we hold both forms for.
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Unlike a value-discovered map this one can genuinely fail: the offsets come from
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declaration order, so a mis-parsed header shows up at once as a whole column of
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wrong values. Keys that miss consistently by a constant factor are reported with
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their decoded/source ratio, which is how unit conversions (deg -> rad, kph ->
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m/s) announce themselves.
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python3 verify_data.py
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"""
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import sys, os, re, collections
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sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
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import datamap
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def close(a, b):
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return abs(a - b) <= max(1e-4, abs(b) * 1e-5)
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def matches(got, want_text, typ):
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"""Compare a decoded value against the raw source text."""
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if typ in datamap.VECTORS:
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nums = [float(x) for x in re.findall(r'-?\d+\.?\d*(?:[eE][-+]?\d+)?', want_text)]
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return len(nums) == len(got) and all(close(a, b) for a, b in zip(got, nums))
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if typ == "char":
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return got.lower() == want_text.strip().lower()
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if typ in ("bool", "BYTE"):
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w = want_text.strip().lower()
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if w in ("true", "yes", "1"):
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return got == 1
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if w in ("false", "no", "0"):
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return got == 0
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return None
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try:
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return close(float(got), float(want_text))
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except ValueError:
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return None
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def main():
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pairs, field_map = datamap.build()
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t = collections.Counter()
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bad = collections.Counter()
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examples = []
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for ch, kv, blob in pairs:
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for key, (off, typ, size, angle) in field_map.items():
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if key not in kv:
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continue
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got = datamap.read(blob, off, typ, size, angle)
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ok = matches(got, kv[key], typ)
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if ok is None:
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t["skipped"] += 1
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continue
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t["values"] += 1
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if ok:
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t["ok"] += 1
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else:
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bad[key] += 1
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if len(examples) < 12:
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examples.append((ch, key, typ, kv[key], got, off))
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print(f"chassis : {len(pairs)}")
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print(f"mapped keys : {len(field_map)}")
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print(f"values compared : {t['values']} exact: {t['ok']} wrong: {t['values'] - t['ok']}")
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print(f"not comparable : {t['skipped']} (enum/resource text, decoded separately)")
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if bad:
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print("\nkeys not matching:")
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for k, v in bad.most_common(25):
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print(f" {k:34s} x{v}")
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print("\nexamples (chassis, key, type, source, decoded, offset):")
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for ch, key, typ, src, got, off in examples:
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print(f" {ch:14s} {key:28s} {typ:10s} src={src!r:24s} got={got!r} @{off}")
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if __name__ == "__main__":
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main()
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