aa3da00bfa
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>
77 lines
2.3 KiB
Python
77 lines
2.3 KiB
Python
"""What do T1/T2/T3 entries point at? Plus: extract XOR-0xFF strings from scripts.
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Prints dword windows around table-entry targets, and scans for complement-encoded
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Shift-JIS strings.
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"""
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import struct
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import sys
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from pathlib import Path
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ROOT = Path(__file__).resolve().parents[2] / "extracted" / "DATA1"
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def parse(path):
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data = path.read_bytes()
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f = struct.unpack_from("<13I", data, 8)
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body = data[0x3C:]
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return data, f, body
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def dw(body, i):
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return struct.unpack_from("<I", body, i * 4)[0]
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def try_string(body, i, max_dwords=40):
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"""Try to decode a XOR-0xFF cp932 string starting at dword i."""
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raw = bytearray()
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n = 0
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for j in range(i, min(i + max_dwords, len(body) // 4)):
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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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n += 1
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if 0 in chunk:
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break
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else:
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return None, 0
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s = raw.split(b"\0")[0]
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if len(s) == 0:
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return "", n
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try:
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dec = s.decode("cp932")
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except UnicodeDecodeError:
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return None, 0
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if all(0x20 <= b or b in (0x09,) for b in s):
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return dec, n
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return None, 0
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def windows(name):
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data, f, body = parse(ROOT / name)
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nd = len(body) // 4
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print(f"\n=== {name} (body {nd} dw, code {f[8]} dw) ===")
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for label, cnt, off in (("T1", f[7], f[8]), ("T2", f[9], f[10]), ("T3", f[11], f[12])):
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entries = [dw(body, off + k) for k in range(min(cnt, 6))]
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print(f" {label}: {cnt} entries -> {[hex(e) for e in entries]}")
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for e in entries[:4]:
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ctx = [dw(body, i) for i in range(max(0, e - 2), min(nd, e + 5))]
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s, _ = try_string(body, e)
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tag = f" str@target: {s!r}" if s else ""
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print(f" target {e:#x}: [-2..+4] = {[hex(v) for v in ctx]}{tag}")
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def scan_strings(name, limit=15, min_len=4):
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data, f, body = parse(ROOT / name)
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nd = len(body) // 4
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print(f"\n=== strings in {name} ===")
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found = 0
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i = 0
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while i < nd and found < limit:
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s, n = try_string(body, i)
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if s and len(s) >= min_len:
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print(f" [{i:#x}] {s!r}")
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found += 1
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i += n
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else:
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i += 1
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if __name__ == "__main__":
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for n in ("MENU.BIN", "ADDEXP.BIN", "CALLBACK_LOST.BIN", "ALCHEMY.BIN"):
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windows(n)
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scan_strings("MENU.BIN")
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scan_strings("SC0030.BIN", limit=20, min_len=6)
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