NorthstarLauncher/NorthstarDLL/nsmem.h

#pragma once
#include "pch.h"

// KittenPopo's memory stuff, made for northstar (because I really can't handle working with northstar's original memory stuff tbh)

#pragma region Pattern Scanning
namespace NSMem
{
	inline std::vector<int> HexBytesToString(const char* str)
	{
		std::vector<int> patternNums;
		int size = strlen(str);
		for (int i = 0; i < size; i++)
		{
			char c = str[i];

			// If this is a space character, ignore it
			if (c == ' ' || c == '\t')
				continue;

			if (c == '?')
			{
				// Add a wildcard (-1)
				patternNums.push_back(-1);
			}
			else if (i < size - 1)
			{
				BYTE result = 0;
				for (int j = 0; j < 2; j++)
				{
					int val = 0;
					char c = *(str + i + j);
					if (c >= 'a')
					{
						val = c - 'a' + 0xA;
					}
					else if (c >= 'A')
					{
						val = c - 'A' + 0xA;
					}
					else if (isdigit(c))
					{
						val = c - '0';
					}
					else
					{
						assert(false);
						val = -1;
					}

					result += (j == 0) ? val * 16 : val;
				}
				patternNums.push_back(result);
			}

			i++;
		}

		return patternNums;
	}

	inline void* PatternScan(void* module, const int* pattern, int patternSize, int offset)
	{
		if (!module)
			return NULL;

		auto dosHeader = (PIMAGE_DOS_HEADER)module;
		auto ntHeaders = (PIMAGE_NT_HEADERS)((BYTE*)module + dosHeader->e_lfanew);

		auto sizeOfImage = ntHeaders->OptionalHeader.SizeOfImage;

		auto scanBytes = (BYTE*)module;

		for (auto i = 0; i < sizeOfImage - patternSize; ++i)
		{
			bool found = true;
			for (auto j = 0; j < patternSize; ++j)
			{
				if (scanBytes[i + j] != pattern[j] && pattern[j] != -1)
				{
					found = false;
					break;
				}
			}

			if (found)
			{
				uintptr_t addressInt = (uintptr_t)(&scanBytes[i]) + offset;
				return (uint8_t*)addressInt;
			}
		}

		return nullptr;
	}

	inline void* PatternScan(const char* moduleName, const char* pattern, int offset = 0)
	{
		std::vector<int> patternNums = HexBytesToString(pattern);

		return PatternScan(GetModuleHandleA(moduleName), &patternNums[0], patternNums.size(), offset);
	}

	inline void BytePatch(uintptr_t address, const BYTE* vals, int size)
	{
		WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, vals, size, NULL);
	}

	inline void BytePatch(uintptr_t address, std::initializer_list<BYTE> vals)
	{
		std::vector<BYTE> bytes = vals;
		if (!bytes.empty())
			BytePatch(address, &bytes[0], bytes.size());
	}

	inline void BytePatch(uintptr_t address, const char* bytesStr)
	{
		std::vector<int> byteInts = HexBytesToString(bytesStr);
		std::vector<BYTE> bytes;
		for (int v : byteInts)
			bytes.push_back(v);

		if (!bytes.empty())
			BytePatch(address, &bytes[0], bytes.size());
	}

	inline void NOP(uintptr_t address, int size)
	{
		BYTE* buf = (BYTE*)malloc(size);
		memset(buf, 0x90, size);
		BytePatch(address, buf, size);
		free(buf);
	}

	inline bool IsMemoryReadable(void* ptr, size_t size)
	{
		static SYSTEM_INFO sysInfo;
		if (!sysInfo.dwPageSize)
			GetSystemInfo(&sysInfo); // This should always be 4096 unless ur playing on NES or some shit but whatever

		MEMORY_BASIC_INFORMATION memInfo;

		if (!VirtualQuery(ptr, &memInfo, sizeof(memInfo)))
			return false;

		if (memInfo.RegionSize < size)
			return false;

		return (memInfo.State & MEM_COMMIT) && !(memInfo.Protect & PAGE_NOACCESS);
	}
} // namespace NSMem

#pragma region KHOOK
struct KHookPatternInfo
{
	const char *moduleName, *pattern;
	int offset = 0;

	KHookPatternInfo(const char* moduleName, const char* pattern, int offset = 0) : moduleName(moduleName), pattern(pattern), offset(offset)
	{
	}
};

struct KHook
{
	KHookPatternInfo targetFunc;
	void* targetFuncAddr;
	void* hookFunc;
	void** original;

	static inline std::vector<KHook*> _allHooks;

	KHook(KHookPatternInfo targetFunc, void* hookFunc, void** original) : targetFunc(targetFunc)
	{
		this->hookFunc = hookFunc;
		this->original = original;
		_allHooks.push_back(this);
	}

	bool Setup()
	{
		targetFuncAddr = NSMem::PatternScan(targetFunc.moduleName, targetFunc.pattern, targetFunc.offset);
		if (!targetFuncAddr)
			return false;

		return (MH_CreateHook(targetFuncAddr, hookFunc, original) == MH_OK) && (MH_EnableHook(targetFuncAddr) == MH_OK);
	}
};
#define KHOOK(name, funcPatternInfo, returnType, convention, args)                                                                         \
	returnType convention hk##name args;                                                                                                   \
	auto o##name = (returnType(convention*) args)0;                                                                                        \
	KHook k##name = KHook(KHookPatternInfo funcPatternInfo, reinterpret_cast<void*>(&hk##name), (void**)&o##name);                         \
	returnType convention hk##name args
#pragma endregion