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#include "Memory.h"
#include <psapi.h>
#include <tlhelp32.h>
#include <iostream>
#undef PROCESSENTRY32
#undef Process32Next
Memory::Memory(const std::string& processName) {
// First, get the handle of the process
PROCESSENTRY32 entry;
entry.dwSize = sizeof(entry);
HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
while (Process32Next(snapshot, &entry)) {
if (processName == entry.szExeFile) {
_handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, entry.th32ProcessID);
break;
}
}
if (!_handle) {
std::cout << "Couldn't find " << processName.c_str() << ", is it open?" << std::endl;
exit(EXIT_FAILURE);
}
// Next, get the process base address
DWORD numModules;
std::vector<HMODULE> moduleList(1024);
EnumProcessModulesEx(_handle, &moduleList[0], moduleList.size(), &numModules, 3);
std::string name(64, 0);
for (DWORD i = 0; i < numModules / sizeof(HMODULE); i++) {
GetModuleBaseNameA(_handle, moduleList[i], &name[0], sizeof(name));
// TODO: Filling with 0s still yeilds name.size() == 64...
if (strcmp(processName.c_str(), name.c_str()) == 0) {
_baseAddress = (uintptr_t)moduleList[i];
break;
}
}
if (_baseAddress == 0) {
std::cout << "Couldn't find the base process address!" << std::endl;
exit(EXIT_FAILURE);
}
}
Memory::~Memory() {
CloseHandle(_handle);
}
void Memory::ThrowError() {
std::string message(256, '\0');
FormatMessageA(4096, nullptr, GetLastError(), 1024, &message[0], message.length(), nullptr);
std::cout << message.c_str() << std::endl;
exit(EXIT_FAILURE);
}
void* Memory::ComputeOffset(std::vector<int> offsets)
{
// Leave off the last offset, since it will be either read/write, and may not be of type unitptr_t.
int final_offset = offsets.back();
offsets.pop_back();
uintptr_t cumulativeAddress = _baseAddress;
for (const int offset : offsets) {
cumulativeAddress += offset;
const auto search = _computedAddresses.find(cumulativeAddress);
if (search == std::end(_computedAddresses)) {
// If the address is not yet computed, then compute it.
uintptr_t computedAddress = 0;
if (!ReadProcessMemory(_handle, reinterpret_cast<LPVOID>(cumulativeAddress), &computedAddress, sizeof(uintptr_t), NULL)) {
ThrowError();
}
_computedAddresses[cumulativeAddress] = computedAddress;
}
cumulativeAddress = _computedAddresses[cumulativeAddress];
}
return reinterpret_cast<void*>(cumulativeAddress + final_offset);
}
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