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#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 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;
bool lastChar = 0;
int size = strlen(pattern);
for (int i = 0; i < size; i++)
{
char c = pattern[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 = (pattern + i + j)[0];
if (c >= 'a')
{
val = c - 'a' + 0xA;
}
else if (c >= 'A')
{
val = c - 'A' + 0xA;
}
else
{
val = c - '0';
}
result += (j == 0) ? val * 16 : val;
}
patternNums.push_back(result);
}
i++;
}
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 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)
{
BYTE* buffer = (BYTE*)malloc(size);
size_t numWritten = 0;
ReadProcessMemory(GetCurrentProcess(), ptr, buffer, size, &numWritten);
free(buffer);
return numWritten == size;
}
} // 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;
}
// Returns true if succeeded
static bool InitAllHooks()
{
for (KHook* hook : _allHooks)
{
if (hook->Setup())
{
spdlog::info("KHook hooked at {}", hook->targetFuncAddr);
}
else
{
return false;
}
}
return MH_EnableHook(MH_ALL_HOOKS) == 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, &hk##name, (void**)&o##name); \
returnType convention hk##name args
#pragma endregion
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