ReSkate/Extension/Skater/trick_feed.cpp

#include "trick_feed.h"
#include "Extension/UI/own_ui_writes.h"
#include "Engine/Core/Platform/memory.h"
#include <Windows.h>
#include <array>
#include <atomic>
#include <format>
#include <mutex>
#include <set>
#include <string_view>

// SmokeyDawg58's reading of the trick list's writes, with the asking moved here.
namespace dingosdk::tricks::feed {
namespace {
constexpr std::uint32_t trick_name_member = 0x0002, trick_side_member = 0x009c, trick_landing_member = 0x0034;
constexpr std::uint32_t trick_body_spin_member = 0x00bc, trick_board_spin_member = 0x00ac, trick_stance_member = 0x004e;
constexpr std::uint32_t trick_late_member = 0x007c, trick_darkflip_member = 0x010d, trick_darkcatch_member = 0x00fd;
constexpr std::uintptr_t ui_string_type_rva = 0x765dcc0; // Skate.exe: the UI model's string type
struct Feed {
    std::atomic<bool> on{};
    std::mutex mutex;
    std::vector<Note> notes;
    std::set<std::string> owners;
};
Feed& feed() {
    static auto* value = new Feed;
    return *value;
}
// Readable text at `address`: ASCII, or UTF-16 with every other byte zero; empty when not.
std::string text_at(std::uintptr_t address) noexcept {
    std::array<unsigned char, 96> raw{};
    if (!memory::read_bytes(address, raw.data(), raw.size())) return {};
    const auto printable = [](unsigned char c) { return c >= 0x20 && c < 0x7f; };
    std::string text;
    for (std::size_t i = 0; i < raw.size() && raw[i]; ++i) {
        if (!printable(raw[i])) return {};
        text += static_cast<char>(raw[i]);
    }
    if (text.size() >= 3) return text;
    text.clear();
    for (std::size_t i = 0; i + 1 < raw.size() && (raw[i] || raw[i + 1]); i += 2) {
        if (raw[i + 1] || !printable(raw[i])) return {};
        text += static_cast<char>(raw[i]);
    }
    return text.size() >= 3 ? text : std::string{};
}
// A trick list text that reads as a name: letters with digits, spaces and a little punctuation. A
// pointer read as text ("P#a=") does not.
bool readable_name(std::string_view text) noexcept {
    bool letter = false;
    for (const char c : text) {
        if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) letter = true;
        else if (!(c >= '0' && c <= '9') && c != ' ' && c != '-' && c != '\'' && c != '.' && c != '&' && c != '/' && c != '!' && c != '_')
            return false;
    }
    return letter;
}
} // namespace

void ask(const std::string& owner, bool on) {
    auto& f = feed();
    std::lock_guard lock(f.mutex);
    if (on) f.owners.insert(owner);
    else f.owners.erase(owner);
    f.on.store(!f.owners.empty(), std::memory_order_release);
    if (f.owners.empty()) f.notes.clear();
}
bool wanted() noexcept { return feed().on.load(std::memory_order_acquire); }
std::vector<Note> take() {
    auto& f = feed();
    std::lock_guard lock(f.mutex);
    return std::exchange(f.notes, {});
}

void tap(std::uint64_t handle, std::uintptr_t type, const void* value) noexcept {
    auto& f = feed();
    if (!f.on.load(std::memory_order_acquire) || ui::writing_own_ui) return;
    const auto member = static_cast<std::uint32_t>(handle & 0xffff);
    if (member != trick_name_member && member != trick_side_member && member != trick_landing_member && member != trick_body_spin_member &&
        member != trick_board_spin_member && member != trick_stance_member && member != trick_late_member && member != trick_darkflip_member &&
        member != trick_darkcatch_member)
        return;
    static const auto string_type = reinterpret_cast<std::uintptr_t>(GetModuleHandleW(nullptr)) + ui_string_type_rva;
    if (member == trick_name_member && type != string_type) return;
    try {
        std::uint64_t first{};
        if (!memory::peek_bytes(reinterpret_cast<std::uintptr_t>(value), &first, sizeof first)) return;
        auto text = text_at(static_cast<std::uintptr_t>(first));
        // A name skate. gives as a short code rather than text (one grind wrote 0x42532030): the code
        // itself, the same on every player's game, so it can still be set and copied. A pointer whose
        // text could not be read is not one: it differs from game to game. Some names sit one pointer
        // further in (dark flips): a value that does not read as a name is followed once more.
        if (member == trick_name_member && !text.empty() && !readable_name(text)) {
            std::uint64_t inner{};
            text = memory::read(static_cast<std::uintptr_t>(first), inner) ? text_at(static_cast<std::uintptr_t>(inner)) : std::string();
            if (!readable_name(text)) return;
        }
        if (text.empty() && member == trick_name_member && first && first < 0x100000000ull) text = std::format("Trick #{:x}", first);
        if (text.empty()) return;
        char kind = 'n';
        if (member == trick_side_member) {
            if (!text.starts_with("ID_TRICK_")) return;
            kind = 's';
        } else if (member == trick_landing_member) {
            if (!text.starts_with("ID_TRICK_LANDING")) return;
            kind = 'l';
        } else if (member == trick_body_spin_member) {
            if (text.find_first_not_of("0123456789") != std::string::npos) return;
            kind = 'b';
        } else if (member == trick_board_spin_member) {
            // The board's spin ("360") or how many times it flipped ("Double", "Triple").
            if (text.starts_with("ID_") || text.size() > 16) return;
            kind = 'r';
        } else if (member == trick_stance_member) {
            if (!text.starts_with("ID_STANCE_")) return;
            kind = 'k';
        } else if (member == trick_late_member || member == trick_darkflip_member || member == trick_darkcatch_member) {
            if (member == trick_late_member ? text != "Late" : !text.starts_with("ID_TRICK_DARK")) return;
            text = member == trick_late_member ? "Late" : member == trick_darkflip_member ? "Darkflip" : "Dark Catch";
            kind = 'm';
        }
        std::lock_guard lock(f.mutex);
        if (f.notes.size() < 256) f.notes.push_back({handle >> 16, kind, std::move(text)});
    } catch (...) {}
}
} // namespace dingosdk::tricks::feed