OpenFUT/fifa17-recon/tools/discard_probe.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Read back the DISCARD (quick-sell) value the live client holds for every
resident card, and check it against the client's own `fcc_discardcoins` table.

READ-ONLY. Walks the same CardsDb node tree as card_identity_probe / coach_probe
via /proc/PID/mem; there is no write path in this file.

WHAT THE TWO SLOTS MEAN (FUN_18013fe00 / FUN_180141660)
-------------------------------------------------------
  item+0x38   the `discardValue` WE sent (atom 0xd7), stored verbatim.
  item+0x3c   the value the CLIENT computed for itself.

At 0x180141025 a `cmp dword [rbp+0x198],0` / `ja` SKIPS the whole local
computation when +0x38 is non-zero. So:

  * +0x38 non-zero  ->  the client displays OUR number and +0x3c is not filled.
  * +0x38 zero      ->  the client computes, and +0x3c is what the player sees.

The local computation is
    SELECT price FROM fcc_discardcoins WHERE cardtype==? AND level==? AND rare==?
    value = round_half_up(rating * price / 100)
with `level` = 3 if rating >= 0x4b, 2 if >= 0x41, else 1 (item+0x54), and
cardtype derived from cardsubtypeid by FUN_1800d8330.

WHY THIS TOOL EXISTS
--------------------
For cardtypes 2/3/4/5/10 (the five staff families) the client OVERWRITES the
rating and rare flag we send with values from its own card database before
computing. The server therefore cannot know the displayed price from what it
sent -- it has to be read back. +0x3c is that read-back, and it is the ground
truth for what the server must credit on a quick sell.

Usage:
    python3 discard_probe.py                 # table of every resident card
    python3 discard_probe.py --kind staff    # only the staff families
    python3 discard_probe.py --json out.json
"""
import argparse
import json
import os
import sys

import card_identity_probe as P
import watch_club_model as W

TABLES = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "data", "tables")

F_SERVER_DISCARD = 0x38
F_CLIENT_DISCARD = 0x3C
F_LEVEL = 0x54
F_RARE = 0x58
F_RATING = 0xB4


def cardtype_for_subtype(sub):
    """FUN_1800d8330, read out of its raw two-level jump table."""
    if 0 <= sub <= 3:
        return 1
    if sub == 4:
        return 2
    if sub == 5:
        return 3
    if sub == 6:
        return 10
    if sub == 7:
        return 5
    if sub == 8:
        return 4
    if 9 <= sub <= 11:
        return 7
    if sub in (30, 31, 236) or 145 <= sub <= 150 or 231 <= sub <= 233:
        return 9
    if 51 <= sub <= 136 or 201 <= sub <= 220 or 250 <= sub <= 273 or 300 <= sub <= 341:
        return 6
    return 0


def load_prices():
    """{(cardtype, level, rare): price} from the client's own dumped table."""
    path = os.path.join(TABLES, "fcc_discardcoins.json")
    if not os.path.isfile(path):
        return None
    doc = json.load(open(path))
    rows = doc["rows"] if isinstance(doc, dict) else doc
    return {(r["cardtype"], r["level"], r["rare"]): r["price"] for r in rows}


def predict(prices, cardtype, rating, rare):
    """The client's formula, reproduced. An absent key pays 0, never a floor."""
    if prices is None or cardtype == 0 or rating is None:
        return None
    level = 3 if rating >= 0x4B else (2 if rating >= 0x41 else 1)
    price = prices.get((cardtype, level, rare), 0)
    if price == 0:
        return 0
    return (rating * price + 50) // 100


STAFF_SUBTYPES = (4, 5, 6, 7, 8)


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--kind", choices=("all", "staff", "player", "other"), default="all")
    ap.add_argument("--json", metavar="PATH")
    a = ap.parse_args()

    prices = load_prices()
    if prices is None:
        print("WARNING: no fcc_discardcoins.json under %s -- predictions disabled\n" % TABLES)

    pid = W.find_pid()
    if pid is None:
        print("FIFA17.exe is not running.")
        return 1
    base = W.dll_base(pid)
    if base is None:
        print("pid %d is up but %s is not mapped yet." % (pid, W.DLL))
        return 1
    mem = W.Mem(pid)
    obj = mem.q(base + (W.G_CARDSDB - W.IMG_BASE))
    if not obj:
        print("CardsDb singleton is NULL (no FUT session loaded).")
        return 1

    ns = P.nodes(mem, obj)
    print("pid=%d  CardsDb=%#x  walked=%d\n" % (pid, obj, len(ns)))

    out = []
    for n in ns:
        buf = mem.read(n + P.REC, P.REC_LEN)
        if buf is None or len(buf) < P.REC_LEN:
            continue
        sub = P.u32(buf, P.F_SUBTYPE)
        ct = P.u32(buf, P.F_CARDTYPE)
        rating = P.u8(buf, F_RATING)
        rare = P.u32(buf, F_RARE)
        rec = {
            "resourceId": P.u32(buf, P.F_RESOURCE),
            "subtype": sub,
            "cardtype": ct,
            "decoded_cardtype": cardtype_for_subtype(sub),
            "rating": rating,
            "level": P.u32(buf, F_LEVEL),
            "rare": rare,
            "server_discard": P.u32(buf, F_SERVER_DISCARD),
            "client_discard": P.u32(buf, F_CLIENT_DISCARD),
            "predicted": predict(prices, ct, rating, rare),
        }
        if a.kind == "staff" and sub not in STAFF_SUBTYPES:
            continue
        if a.kind == "player" and ct != 1:
            continue
        if a.kind == "other" and (ct == 1 or sub in STAFF_SUBTYPES):
            continue
        out.append(rec)

    out.sort(key=lambda r: (r["cardtype"], r["subtype"], r["resourceId"]))
    print("%-10s %-4s %-4s %-4s %-4s %-4s %-9s %-9s %-9s %s"
          % ("resource", "sub", "ct", "rat", "lvl", "rar", "sent+38", "calc+3c",
             "predict", "verdict"))
    agree = disagree = notcomputed = 0
    for r in out:
        if r["server_discard"]:
            verdict = "SERVER-SHOWN (local calc skipped)"
            notcomputed += 1
        elif r["predicted"] is None:
            verdict = "?"
        elif r["client_discard"] == r["predicted"]:
            verdict = "AGREES"
            agree += 1
        else:
            verdict = "DISAGREES"
            disagree += 1
        print("%-10s %-4s %-4s %-4s %-4s %-4s %-9s %-9s %-9s %s"
              % (r["resourceId"], r["subtype"], r["cardtype"], r["rating"],
                 r["level"], r["rare"], r["server_discard"], r["client_discard"],
                 r["predicted"], verdict))

    print("\nAGREES=%d  DISAGREES=%d  server-shown=%d  total=%d"
          % (agree, disagree, notcomputed, len(out)))
    if a.json:
        json.dump(out, open(a.json, "w"), indent=2)
        print("wrote %s" % a.json)
    return 0


if __name__ == "__main__":
    sys.exit(main())