3cdf2b24b2
Found the routines in the disassembly DB rather than guessing from data: sub_82447DF0 IDXD tag hash (lbz+extsb, modulus 0x00FFFFDF, magic 0x2101) sub_82447E70 IXUD tag hash (lhz, 64-bit, modulus 0xFFFFFF67 then 0x00FFFFDF) Both transcribed instruction-for-instruction into Python and Rust. IXUD SOLVED. It defeated every single-modulus search because it chains TWO exact moduli -- the loop reduces mod 2^32-153 in 64-bit arithmetic and only the result is folded mod 2^24-33. A polynomial mod M1 folded through M2 is not a polynomial mod anything, which is exactly why the gcd test returned 1. Verified independently: 86/86 record keys and 108,261/108,261 field tags in GP_MAIN_GAME_E.pak, and NoRecord -> 0x1c6d9c96. CORRECTION 1: tag_hash must SIGN-EXTEND each byte (extsb). My reconstruction used unsigned bytes and matched all 1.27M disc names -- every one is ASCII -- while disagreeing on ~90% of random inputs with a byte >= 0x80 (verified: 18096/20000). The disc could never have caught this; only the disassembly did. CORRECTION 2: name_hash's reduction is EXACT, not lossy. The module doc claimed the missing conditional subtract made it something other than %. rlwinm r6,r6, 9,23,31 is just hi>>23, and with RECIP = floor(2^55/M)+1 that is Granlund- Montgomery magic division -- 0 wrong at every quotient boundary across the full 32-bit domain. Retracted. cargo test -p sylpheed-formats --lib hash: 10/10.
49 lines
1.7 KiB
Python
Executable File
49 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Is a modal YES/NO dialog on screen?
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Written because `wait_screen.sh --tap A` BLIND-taps A, and on this game's
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"Load game?" dialog the cursor starts on **NO** — so a blind tap answers NO,
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drops back to the save list, and the next tap reopens the dialog. That is a
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stable oscillation, and it burned three consecutive 300 s boots as
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"NO readyroom" while d-pad and A both worked perfectly.
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The game dims the whole frame behind a modal, so the dialog is detectable
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without knowing which dialog it is: sample the band where the modal sits and
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compare its brightness against the undimmed screen.
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Measured on the LOAD GAME save list (1279x675):
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save list, no dialog mean 59.0 / 62.4 p95 164 / 199
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"Load game?" dialog up mean 34.4 p95 113
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so the threshold sits at 45. Used ONLY to decide whether tapping A is safe:
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with a dialog up, A is the affirmative/OK button; without one, A may mean
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something destructive like "open the dialog again".
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⚠️ Calibrated on 1 positive and 2 negatives — thin. Widen it as runs collect
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more frames.
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Usage: dialog_up.py <png> -> prints metrics, exit 0 if a dialog is up
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"""
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import sys
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import numpy as np
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from PIL import Image
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THRESHOLD = 45.0
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def metric(path):
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im = np.asarray(Image.open(path).convert("L"), dtype=float)
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h, w = im.shape
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box = im[int(h * 0.33):int(h * 0.48), int(w * 0.28):int(w * 0.72)]
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return float(box.mean()), float(np.percentile(box, 95))
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if __name__ == "__main__":
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mean, p95 = metric(sys.argv[1])
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up = mean < THRESHOLD
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print("%s mean=%.1f p95=%.1f threshold=%.0f" %
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("dialog" if up else "no-dialog", mean, p95, THRESHOLD))
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sys.exit(0 if up else 1)
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