F/SN Remastered Parallels crash fix PoC; not final

blade_fix.cpp

#define WIN32_LEAN_AND_MEAN
#include<Windows.h>
#include<stdlib.h>
#include<stdio.h>
#include<stdint.h>

// Fate/stay night REMASTERED Parallels crash bug fix
// 2024 Nightshade System (lostkagamine)

char* Address_Array(uint64_t addr)
{
	char* mem = (char*)malloc(0x8);
	int i = 0;
	for (uint64_t t = 0xff; i < 8; t <<= 8)
	{
		char byte = (addr & t) >> (i * 8);
		mem[i] = byte;
		i++;
	}
	return mem;
}

void Blade_PatchMemory()
{
	uint64_t base = (uint64_t)GetModuleHandle(NULL);
	
	void* page = VirtualAlloc(NULL,
		0x10,
		MEM_COMMIT | MEM_RESERVE,
		PAGE_EXECUTE_READWRITE);
	if (page == 0) TerminateProcess((HANDLE)base, 1);

	*(char*)page = 0xc3; // ret

	uint64_t addr = base + 0xbfd370; // glClearTexImage

	char* addrToPage = Address_Array((uint64_t)page);
	memcpy((void*)addr, addrToPage, 0x8);

	char* buf = (char*)malloc(8000);
	sprintf(buf, "Patched glClearTexImage successfully! Page is at 0x%llx.", (uint64_t)page);
	MessageBoxA(NULL, buf, "blade_fix", MB_ICONINFORMATION | MB_OK);
	free(buf);
}