LunaHook-mirror/LunaHook/engine32/GameMaker.cpp

#include"GameMaker.h"

bool GameMakerFilter(LPVOID data, size_t* size, HookParam*)
{
    CharFilter(reinterpret_cast<LPSTR>(data), reinterpret_cast<size_t*>(size), '#');
    return true;
}

bool InsertGameMakerHook()
{
    
      /*
      * Sample games:
      *   VA-11 Hall A
      */
    const BYTE bytes[] = {
      0x85, 0xF6,                 // test esi,esi
      0x74, XX,                   // je "VA-11 Hall A.exe"+D5014
      0x85, 0xC0,                 // test eax,eax
      0x74, XX,                   // je "VA-11 Hall A.exe"+D5014
      0x50,                       // push eax
      0x56                        // push esi          << hook here
    };
    enum { addr_offset = sizeof(bytes) - 1 };

    ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
    ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
    if (!addr) {
        ConsoleOutput("GameMaker: pattern not found");
        return false;
    }

    HookParam hp;
    hp.address = addr + addr_offset;
    hp.offset=get_reg(regs::eax);
    hp.type = USING_STRING | NO_CONTEXT;
    hp.filter_fun = GameMakerFilter;
    ConsoleOutput(" INSERT GameMaker");
    
    ConsoleOutput("GameMaker: use regex filter .+\\]");
    return NewHook(hp, "GameMaker");
}

bool GameMaker::attach_function() { 
    return InsertGameMakerHook();
}