some SH2 PC patches

silent-hill-2-pc-misc-patches.c

#include "pch.h"

#define UNK2_DebugLog_offs  0x005657C0
#define ADX_DebugLog_offs   0x0055F030
#define UNK_DebugLog_offs   0x005670E0

#define MH_Call(x)          status = x;             \
                            if (status != MH_OK)    \
                                return

__declspec(dllexport) void func(void) {}

int __stdcall printfHook(char const* _Format, ...) {
    va_list args;
    va_start(args, _Format);
    vprintf(_Format, args);
    va_end(args);
    return 0;
}

int (__cdecl* UNK_DebugLog_orig) (int a1, const char* src);
int __cdecl UNK_DebugLog_hook(int a1, const char* src) {
    printf("[DBG] %s\n", src);
    return UNK_DebugLog_orig(a1, src);
}

void (__cdecl* ADX_DebugLog_orig) (const char* source);
void __cdecl ADX_DebugLog_hook(const char* source) {
    printf("[DBG] %s\n", source);
    ADX_DebugLog_orig(source);
}

void OutputDebugStringA_hook(LPCSTR lpOutputString) {
    printf("[DBG] %s\n", lpOutputString);
}

void main_thread() {
    // Initiailize MinHook
    MH_STATUS status = MH_Initialize();
    if (status != MH_OK)
        return;

    // Re-enable ADX debug logging
    MH_Call(MH_CreateHook(reinterpret_cast<LPVOID>(ADX_DebugLog_offs), &ADX_DebugLog_hook, reinterpret_cast<LPVOID*>(&ADX_DebugLog_orig)));
    MH_Call(MH_EnableHook(reinterpret_cast<LPVOID>(ADX_DebugLog_offs)));

    // Re-enable unknown debug logging
    MH_Call(MH_CreateHook(reinterpret_cast<LPVOID>(UNK_DebugLog_offs), &UNK_DebugLog_hook, reinterpret_cast<LPVOID*>(&UNK_DebugLog_orig)));
    MH_Call(MH_EnableHook(reinterpret_cast<LPVOID>(UNK_DebugLog_offs)));

    // Re-enable developer debug logging
    PVOID pOldProc;
    if (!HookIAT("MSVCR70.DLL", "printf", (PVOID)printfHook, &pOldProc))
        printf("error;%ld\n", GetLastError());

    if (!HookIAT("KERNEL32.DLL", "OutputDebugStringA", (PVOID)OutputDebugStringA_hook, &pOldProc))
        printf("error;%ld\n", GetLastError());

    // Fix sound looping issue by setting the process to use a single core.
    SetProcessAffinityMask(GetCurrentProcess(), 1 << 0);
}

BOOL APIENTRY DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
{
    DisableThreadLibraryCalls(hModule);

    // Steal stdout/stderr/stdin
    AllocConsole();
    freopen("CONOUT$", "w", stdout);
    freopen("CONOUT$", "w", stderr);
    freopen("CONIN$", "r", stdin);

    SetConsoleTitle("Silent Hill 2 PC Tools");

    // Set codepage so that we can properly display shift-jis output
    SetConsoleOutputCP(932);

    // Setup our main thread
    if (dwReason == DLL_PROCESS_ATTACH)
        CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&main_thread, NULL, 0, NULL);

    return TRUE;
}