463877773c
Reverse-engineering + open reimplementation workspace for Eushully's AGE/SYS4 engine (first target: Himegari). The repo root is age-reimpl/; the original game install and the extracted ALF data are siblings outside the repo and are never tracked. build/ (derived corpora) is gitignored and regenerated by the tools. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
"""Find how instructions reference string offsets, and inspect 0x71 operands
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in context. Uses T3 jump-target values as confirmed instruction starts.
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"""
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import struct
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from pathlib import Path
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from collections import Counter
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ROOT = Path(__file__).resolve().parents[2] / "extracted" / "DATA1"
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def parse(name):
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data = (ROOT / name).read_bytes()
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f = struct.unpack_from("<13I", data, 8)
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body = data[0x3C:]
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n = len(body) // 4
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dws = struct.unpack_from(f"<{n}I", body, 0)
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return f, dws, body
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def decode_str(body, i):
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raw = bytearray()
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n = len(body) // 4
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for j in range(i, min(i + 60, n)):
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chunk = bytes(b ^ 0xFF for b in body[j*4:(j+1)*4])
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raw += chunk
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if 0 in chunk:
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break
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try:
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return bytes(raw).split(b"\0")[0].decode("cp932")
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except UnicodeDecodeError:
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return None
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def xref(name, targets):
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f, dws, body = parse(name)
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print(f"\n=== {name}: xrefs to {[hex(t) for t in targets]} ===")
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for t in targets:
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hits = [i for i, v in enumerate(dws[:f[8]]) if v == t]
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for i in hits:
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lo = max(0, i - 6)
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ctx = " ".join(f"{v:x}" for v in dws[lo:i + 3])
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print(f" {t:#x} referenced at [{i:#x}]: ...{ctx}...")
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def sample_71(name, k=6):
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f, dws, body = parse(name)
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print(f"\n=== {name}: T1 (0x71) operands in context ===")
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off, cnt = f[8], f[7]
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for e in list(dws[off:off + cnt])[:k]:
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lo = max(0, e - 8)
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ctx = " ".join(f"{v:x}" for v in dws[lo:e + 4])
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print(f" target [{e:#x}]: ...{ctx}...")
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def first_instrs(name, count=20):
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"""Dump first N dwords raw, plus known instruction starts from T3 values."""
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f, dws, body = parse(name)
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starts = sorted(set(dws[f[12]:f[12] + f[11]]))
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print(f"\n=== {name}: first dwords ===")
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print(" " + " ".join(f"{v:x}" for v in dws[:count]))
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print(f" T3-confirmed instruction starts (first 12): {[hex(s) for s in starts[:12]]}")
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if __name__ == "__main__":
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xref("MENU.BIN", [0x303, 0x30B, 0x30E])
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xref("SC0030.BIN", [0xEF80, 0xEF89, 0xEF91])
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sample_71("SC0030.BIN")
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sample_71("MENU.BIN", k=2)
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first_instrs("MENU.BIN")
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first_instrs("SC0030.BIN")
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