Major restructuring -- also set up for UI work tomorrow

1 files changed, 80 insertions, 0 deletions

@@ -0,0 +1,80 @@
+#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], static_cast<DWORD>(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], static_cast<DWORD>(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);
+}