Properly implement FString for GetEngineVersion etc

.gitignore

@@ -1,43 +1,253 @@
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+>>>>>>> Stashed changes

Engine/CoreTypes/FString.h

@@ -0,0 +1,299 @@
+/**
+ * UniversalSlashingSimulator - FString Implementation
+ *
+ * Version-agnostic FString implementation for reading/writing Unreal Engine strings.
+ * Supports UE4.16 through UE5.x.
+ *
+ * FString in UE is essentially TArray<TCHAR> where TCHAR is wchar_t on Windows.
+ * The memory layout is consistent across all supported versions:
+ *   - Data pointer (TCHAR*)
+ *   - ArrayNum (int32) - number of elements including null terminator
+ *   - ArrayMax (int32) - allocated capacity
+ */
+
+#pragma once
+
+#include "../../Core/Common.h"
+#include "../../Core/Memory/Memory.h"
+#include <string>
+
+namespace USS
+{
+    /**
+     * Read-only view of an FString in memory
+     * Used for reading FString data returned by engine functions
+     */
+    class FStringView
+    {
+    public:
+        FStringView() : m_Data(nullptr), m_Num(0), m_Max(0) {}
+
+        FStringView(const wchar_t* Data, int32 Num, int32 Max)
+            : m_Data(Data), m_Num(Num), m_Max(Max) {}
+
+        // Read from memory address (where FString struct is located)
+        static FStringView FromAddress(uintptr_t Address)
+        {
+            if (!Address)
+                return FStringView();
+
+            FStringView View;
+            Memory::Read<const wchar_t*>(Address, View.m_Data);
+            Memory::Read<int32>(Address + sizeof(void*), View.m_Num);
+            Memory::Read<int32>(Address + sizeof(void*) + sizeof(int32), View.m_Max);
+            return View;
+        }
+
+        bool IsValid() const { return m_Data != nullptr && m_Num > 0; }
+        bool IsEmpty() const { return m_Num <= 1; }  // 1 = just null terminator
+
+        int32 Len() const { return m_Num > 0 ? m_Num - 1 : 0; }
+
+        const wchar_t* GetData() const { return m_Data; }
+
+        std::wstring ToWString() const
+        {
+            if (!IsValid() || IsEmpty())
+                return std::wstring();
+
+            std::wstring Result;
+            Result.reserve(Len());
+
+            for (int32 i = 0; i < Len(); ++i)
+            {
+                wchar_t Ch = 0;
+                Memory::Read<wchar_t>(reinterpret_cast<uintptr_t>(m_Data) + (i * sizeof(wchar_t)), Ch);
+                if (Ch == 0) break;
+                Result += Ch;
+            }
+
+            return Result;
+        }
+
+        // Convert to std::string (narrow, ASCII-safe)
+        std::string ToString() const
+        {
+            if (!IsValid() || IsEmpty())
+                return std::string();
+
+            std::string Result;
+            Result.reserve(Len());
+
+            for (int32 i = 0; i < Len(); ++i)
+            {
+                wchar_t Ch = 0;
+                Memory::Read<wchar_t>(reinterpret_cast<uintptr_t>(m_Data) + (i * sizeof(wchar_t)), Ch);
+                if (Ch == 0) break;
+                // Convert to narrow char (works for ASCII range)
+                Result += static_cast<char>(Ch & 0xFF);
+            }
+
+            return Result;
+        }
+
+    private:
+        const wchar_t* m_Data;
+        int32 m_Num;
+        int32 m_Max;
+    };
+
+    /**
+     * FString structure layout (for direct memory access)
+     * This matches the in-memory layout of FString across all UE4/5 versions
+     */
+    struct FStringData
+    {
+        wchar_t* Data;      // Pointer to TCHAR array
+        int32 ArrayNum;     // Number of elements (including null terminator)
+        int32 ArrayMax;     // Allocated capacity
+
+        FStringView AsView() const
+        {
+            return FStringView(Data, ArrayNum, ArrayMax);
+        }
+
+        bool IsValid() const { return Data != nullptr && ArrayNum > 0; }
+
+        std::string ToString() const
+        {
+            return AsView().ToString();
+        }
+
+        std::wstring ToWString() const
+        {
+            return AsView().ToWString();
+        }
+    };
+
+    /**
+     * FString wrapper class for creating and managing FString-compatible data
+     * Can be passed to UE functions expecting FString parameters
+     */
+    class FString
+    {
+    public:
+        FString() : m_Data(nullptr), m_Num(0), m_Max(0) {}
+
+        explicit FString(const char* Str)
+        {
+            if (Str && *Str)
+            {
+                size_t Len = strlen(Str);
+                Allocate(static_cast<int32>(Len + 1));
+
+                for (size_t i = 0; i <= Len; ++i)
+                {
+                    m_Data[i] = static_cast<wchar_t>(Str[i]);
+                }
+                m_Num = static_cast<int32>(Len + 1);
+            }
+            else
+            {
+                m_Data = nullptr;
+                m_Num = 0;
+                m_Max = 0;
+            }
+        }
+
+        explicit FString(const wchar_t* Str)
+        {
+            if (Str && *Str)
+            {
+                size_t Len = wcslen(Str);
+                Allocate(static_cast<int32>(Len + 1));
+                memcpy(m_Data, Str, (Len + 1) * sizeof(wchar_t));
+                m_Num = static_cast<int32>(Len + 1);
+            }
+            else
+            {
+                m_Data = nullptr;
+                m_Num = 0;
+                m_Max = 0;
+            }
+        }
+
+        explicit FString(const std::string& Str)
+            : FString(Str.c_str())
+        {}
+
+        explicit FString(const std::wstring& Str)
+            : FString(Str.c_str())
+        {}
+
+        FString(const FString& Other)
+        {
+            if (Other.m_Data && Other.m_Num > 0)
+            {
+                Allocate(Other.m_Num);
+                memcpy(m_Data, Other.m_Data, Other.m_Num * sizeof(wchar_t));
+                m_Num = Other.m_Num;
+            }
+            else
+            {
+                m_Data = nullptr;
+                m_Num = 0;
+                m_Max = 0;
+            }
+        }
+
+        FString(FString&& Other) noexcept
+            : m_Data(Other.m_Data)
+            , m_Num(Other.m_Num)
+            , m_Max(Other.m_Max)
+        {
+            Other.m_Data = nullptr;
+            Other.m_Num = 0;
+            Other.m_Max = 0;
+        }
+
+        ~FString()
+        {
+            Free();
+        }
+
+        FString& operator=(const FString& Other)
+        {
+            if (this != &Other)
+            {
+                Free();
+                if (Other.m_Data && Other.m_Num > 0)
+                {
+                    Allocate(Other.m_Num);
+                    memcpy(m_Data, Other.m_Data, Other.m_Num * sizeof(wchar_t));
+                    m_Num = Other.m_Num;
+                }
+            }
+            return *this;
+        }
+
+        FString& operator=(FString&& Other) noexcept
+        {
+            if (this != &Other)
+            {
+                Free();
+                m_Data = Other.m_Data;
+                m_Num = Other.m_Num;
+                m_Max = Other.m_Max;
+                Other.m_Data = nullptr;
+                Other.m_Num = 0;
+                Other.m_Max = 0;
+            }
+            return *this;
+        }
+
+        bool IsEmpty() const { return m_Num <= 1; }
+        bool IsValid() const { return m_Data != nullptr; }
+        int32 Len() const { return m_Num > 0 ? m_Num - 1 : 0; }
+        const wchar_t* GetData() const { return m_Data; }
+        wchar_t* GetData() { return m_Data; }
+
+        FStringView AsView() const
+        {
+            return FStringView(m_Data, m_Num, m_Max);
+        }
+
+        std::string ToString() const
+        {
+            return AsView().ToString();
+        }
+
+        std::wstring ToWString() const
+        {
+            return AsView().ToWString();
+        }
+
+        // Get pointer to the FString struct data (for passing to UE functions)
+        // Returns pointer to this object's internal layout which matches FString
+        void* GetStructPtr() { return &m_Data; }
+        const void* GetStructPtr() const { return &m_Data; }
+
+    private:
+        void Allocate(int32 Capacity)
+        {
+            Free();
+            m_Data = new wchar_t[Capacity];
+            m_Max = Capacity;
+            m_Num = 0;
+        }
+
+        void Free()
+        {
+            if (m_Data)
+            {
+                delete[] m_Data;
+                m_Data = nullptr;
+            }
+            m_Num = 0;
+            m_Max = 0;
+        }
+
+        // Memory layout must match UE's FString
+        wchar_t* m_Data;    // AllocatorInstance.Data
+        int32 m_Num;        // ArrayNum
+        int32 m_Max;        // ArrayMax
+    };
+
+    static_assert(sizeof(FString) == sizeof(void*) + sizeof(int32) * 2,
+        "FString size mismatch - layout may differ from UE");
+
+}