Implement proper FName / FNamePool

src/Prospect.Unreal/Core/Names/EFindName.cs

@@ -0,0 +1,15 @@
+namespace Prospect.Unreal.Core.Names;
+
+public enum EFindName
+{
+    /** Find a name; return 0 if it doesn't exist. */
+    FNAME_Find,
+
+    /** Find a name or add it if it doesn't exist. */
+    FNAME_Add,
+
+    /** Finds a name and replaces it. Adds it if missing. This is only used by UHT and is generally not safe for threading. 
+	 * All this really is used for is correcting the case of names. In MT conditions you might get a half-changed name.
+	 */
+    FNAME_Replace_Not_Safe_For_Threading,
+}

src/Prospect.Unreal/Core/Names/EName.cs

@@ -1,6 +1,6 @@
 namespace Prospect.Unreal.Core.Names
 {
-    public enum UnrealNameKey
+    public enum EName
     {
         None = 0,
 

src/Prospect.Unreal/Core/Names/FName.cs

@@ -1,36 +1,150 @@
-namespace Prospect.Unreal.Core.Names;
+using System.Runtime.CompilerServices;
 
-public class FName
+namespace Prospect.Unreal.Core.Names;
+
+public readonly struct FName
 {
-    public FName()
+    public FName() : this(EName.None, FNameHelper.NAME_NO_NUMBER_INTERNAL)
     {
-        NameIndex = -1; // ?
-        Number = -1; // ?
-        Str = "None";
     }
     
-    public FName(string str)
+    /// <summary>
+    ///     Create an FName with a hardcoded string index.
+    /// </summary>
+    /// <param name="hardcodedName">The hardcoded value the string portion of the name will have</param>
+    public FName(EName hardcodedName) : this(hardcodedName, FNameHelper.NAME_NO_NUMBER_INTERNAL)
     {
-        NameIndex = -1;
+        
-        Number = -1;
-        Str = str;
     }
     
-    public FName(string str, int number)
+    /// <summary>
+    ///     Create an FName with a hardcoded string index and (instance).
+    /// </summary>
+    /// <param name="hardcodedName">The hardcoded value the string portion of the name will have</param>
+    /// <param name="number">The hardcoded value for the number portion of the name</param>
+    public FName(EName hardcodedName, int number)
     {
-        NameIndex = -1;
+        Index = FNamePool.Find(hardcodedName);
-        Number = number;
+        Number = (uint)number;
-        Str = str;
     }
 
-    public Int32 NameIndex { get; set; }
+    /// <summary>
+    ///     Create an FName. If FindType is FNAME_Find, and the string part of the name
+    ///     doesn't already exist, then the name will be NAME_None.
+    /// </summary>
+    /// <param name="value">Value for the string portion of the name</param>
+    /// <param name="findType">Action to take</param>
+    public FName(string value, EFindName findType = EFindName.FNAME_Add)
+    {
+        var name = FNameHelper.MakeDetectNumber(value, findType);
 
-    public Int32 Number { get; set; }
+        Index = name.Index;
+        Number = name.Number;
+    }
 
-    public string Str { get; set; }
+    /// <summary>
+    ///     Create an FName. If FindType is FNAME_Find, and the string part of the name
+    ///     doesn't already exist, then the name will be NAME_None.
+    /// </summary>
+    /// <param name="value">Value for the string portion of the name</param>
+    /// <param name="number">Value for the number portion of the name</param>
+    /// <param name="findType">Action to take</param>
+    public FName(string value, int number, EFindName findType = EFindName.FNAME_Add)
+    {
+        var name = FNameHelper.MakeWithNumber(value, findType, number);
+
+        Index = name.Index;
+        Number = name.Number;
+    }
+
+    /// <summary>
+    ///     Only use this if you know what you are doing (:
+    /// </summary>
+    public FName(FNameEntryId index, int number)
+    {
+        Index = index;
+        Number = (uint)number;
+    }
+
+    /// <summary>
+    ///     Index of the name
+    /// </summary>
+    public FNameEntryId Index { get; }
+    
+    /// <summary>
+    ///     Number portion of the string/number pair
+    ///     (stored internally as 1 more than actual, so zero'd memory will be the default, no-instance case)
+    /// </summary>
+    public uint Number { get; }
+    
+    public static implicit operator FName(EName name)
+    {
+        return new FName(name);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public int GetNumber()
+    {
+        return (int)Number;
+    }
+
+    public string GetPlainNameString()
+    {
+        return FNamePool.Resolve(Index);
+    }
+    
+    public EName? ToEName()
+    {
+        return FNamePool.FindEName(Index);
+    }
 
     public override string ToString()
     {
-        return Str;
+        var name = GetPlainNameString();
+        
+        if (Number == FNameHelper.NAME_NO_NUMBER_INTERNAL)
+        {
+            return name;
+        }
+
+        return $"{name}_{FNameHelper.NAME_INTERNAL_TO_EXTERNAL(GetNumber())}";
+    }
+    
+    public static bool operator ==(FName left, EName right)
+    {
+        return (left.Index == right) & (left.GetNumber() == 0);
+    }
+
+    public static bool operator !=(FName left, EName right)
+    {
+        return (left.Index != right) | (left.GetNumber() != 0);
+    }
+    
+    public static bool operator ==(FName left, FName right)
+    {
+        return (left.Index == right.Index) & (left.GetNumber() == right.GetNumber());
+    }
+
+    public static bool operator !=(FName left, FName right)
+    {
+        return !(left == right);
+    }
+    
+    public bool Equals(FName other)
+    {
+        return this == other;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return obj is FName other && Equals(other);
+    }
+
+    public override int GetHashCode()
+    {
+        unchecked
+        {
+            return (Index.GetHashCode() * 397) ^ (int)Number;
+        }
     }
 }

src/Prospect.Unreal/Core/Names/FNameEntryId.cs

@@ -0,0 +1,51 @@
+namespace Prospect.Unreal.Core.Names;
+
+public readonly struct FNameEntryId
+{
+    public FNameEntryId()
+    {
+        Value = 0;
+    }
+    
+    public FNameEntryId(uint value)
+    {
+        Value = value;
+    }
+    
+    public readonly uint Value;
+    
+    public static bool operator ==(FNameEntryId left, EName right)
+    {
+        return left == FNamePool.Find(right);
+    }
+
+    public static bool operator !=(FNameEntryId left, EName right)
+    {
+        return !(left == right);
+    }
+    
+    public static bool operator ==(FNameEntryId left, FNameEntryId right)
+    {
+        return left.Value == right.Value;
+    }
+    
+    public static bool operator !=(FNameEntryId left, FNameEntryId right)
+    {
+        return left.Value != right.Value;
+    }
+    
+    public bool Equals(FNameEntryId other)
+    {
+        return this == other;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return obj is FNameEntryId other && Equals(other);
+    }
+
+    public override int GetHashCode()
+    {
+        return (int)Value;
+    }
+}

src/Prospect.Unreal/Core/Names/FNameHelper.cs

@@ -0,0 +1,125 @@
+using System.Runtime.CompilerServices;
+
+namespace Prospect.Unreal.Core.Names;
+
+internal static class FNameHelper
+{
+    /// <summary>
+    ///     Externally, the instance number to represent no instance number is NAME_NO_NUMBER, 
+    ///     but internally, we add 1 to indices, so we use this #define internally for 
+    ///     zero'd memory initialization will still make NAME_None as expected
+    /// </summary>
+    public const int NAME_NO_NUMBER_INTERNAL = 0;
+
+    /// <summary>
+    ///     Special value for an FName with no number
+    /// </summary>
+    public const int NAME_NO_NUMBER = NAME_NO_NUMBER_INTERNAL - 1;
+
+    /// <summary>
+    ///     Maximum size of name.
+    /// </summary>
+    public const int NAME_SIZE = 1024;
+    
+    public static FName MakeDetectNumber(string name, EFindName findType)
+    {
+        if (string.IsNullOrEmpty(name))
+        {
+            return new FName();
+        }
+
+        var nameLen = name.Length;
+        var internalNumber = ParseNumber(name, ref nameLen);
+        return MakeWithNumber(name.Substring(0, nameLen), findType, (int)internalNumber);
+    }
+
+    private static uint ParseNumber(ReadOnlySpan<char> name, ref int nameLength)
+    {
+        var len = nameLength;
+        var digits = 0;
+        
+        for (var i = len - 1; i >= 0 && name[i] >= '0' && name[i] <= '9'; --i)
+        {
+            ++digits;
+        }
+
+        var firstDigit = len - digits;
+        const int maxDigitsInt32 = 10;
+        if (digits != 0 && digits < len && name[firstDigit - 1] == '_' && digits <= maxDigitsInt32)
+        {
+            // check for the case where there are multiple digits after the _ and the first one
+            // is a 0 ("Rocket_04"). Can't split this case. (So, we check if the first char
+            // is not 0 or the length of the number is 1 (since ROcket_0 is valid)
+            if (digits == 1 || name[firstDigit] != '0')
+            {
+                var number = long.Parse(name.Slice(len - digits, digits));
+                if (number < int.MaxValue)
+                {
+                    nameLength -= 1 + digits;
+                    return NAME_EXTERNAL_TO_INTERNAL((uint)number);
+                }
+            }
+        }
+
+        return NAME_NO_NUMBER_INTERNAL;
+    }
+
+    public static FName MakeWithNumber(string name, EFindName findType, int internalNumber)
+    {
+        if (name.Length == 0)
+        {
+            return new FName();
+        }
+
+        return Make(name, findType, internalNumber);
+    }
+
+    private static FName Make(string name, EFindName findType, int internalNumber)
+    {
+        if (name.Length >= NAME_SIZE)
+        {
+            return new FName("ERROR_NAME_SIZE_EXCEEDED");
+        }
+
+        FNameEntryId index;
+        
+        if (findType == EFindName.FNAME_Add)
+        {
+            index = FNamePool.Store(name);
+        } 
+        else if (findType == EFindName.FNAME_Find)
+        {
+            index = FNamePool.Find(name);
+        }
+        else
+        {
+            throw new NotImplementedException();
+        }
+
+        return new FName(index, internalNumber);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static uint NAME_EXTERNAL_TO_INTERNAL(uint number)
+    {
+        return number + 1;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int NAME_EXTERNAL_TO_INTERNAL(int number)
+    {
+        return number + 1;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static uint NAME_INTERNAL_TO_EXTERNAL(uint number)
+    {
+        return number - 1;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int NAME_INTERNAL_TO_EXTERNAL(int number)
+    {
+        return number - 1;
+    }
+}

src/Prospect.Unreal/Core/Names/FNamePool.cs

@@ -0,0 +1,89 @@
+namespace Prospect.Unreal.Core.Names;
+
+public static class FNamePool
+{
+    private static readonly object NamesLock = new object();
+    
+    /// <summary>
+    ///     Map hardcoded names in <see cref="UnrealNames"/>.
+    /// </summary>
+    private static readonly Dictionary<EName, FNameEntryId> HardcodedNames = new Dictionary<EName, FNameEntryId>();
+    private static readonly Dictionary<FNameEntryId, EName> HardcodedNamesReverse = new Dictionary<FNameEntryId, EName>();
+
+    /// <summary>
+    ///     Map existing strings to a <see cref="FName.Index"/>.
+    /// </summary>
+    private static readonly Dictionary<string, FNameEntryId> Names = new Dictionary<string, FNameEntryId>();
+    private static readonly Dictionary<FNameEntryId, string> NamesReverse = new Dictionary<FNameEntryId, string>();
+
+    private static uint _counter;
+    
+    static FNamePool()
+    {
+        // Initialize hardcoded names.
+        foreach (var (key, value) in UnrealNames.Names)
+        {
+            var index = Store(value);
+            HardcodedNames[key] = index;
+            HardcodedNamesReverse[index] = key;
+        }
+    }
+
+    public static EName? FindEName(FNameEntryId index)
+    {
+        if (HardcodedNamesReverse.TryGetValue(index, out var result))
+        {
+            return result;
+        }
+
+        return null;
+    }
+
+    public static FNameEntryId Find(string name)
+    {
+        if (Names.TryGetValue(name, out var result))
+        {
+            return result;
+        }
+
+        return new FNameEntryId((uint)EName.None);
+    }
+    
+    public static FNameEntryId Find(EName name)
+    {
+        return HardcodedNames[name];
+    }
+
+    public static string Resolve(FNameEntryId index)
+    {
+        return NamesReverse[index];
+    }
+
+    public static FNameEntryId Store(ReadOnlySpan<char> valueSpan)
+    {
+        var value = valueSpan.ToString();
+        
+        if (Names.TryGetValue(value, out var result))
+        {
+            return result;
+        }
+
+        lock (NamesLock)
+        {
+            // Check again incase a previous lock added it.
+            if (Names.TryGetValue(value, out result))
+            {
+                return result;
+            }
+            
+            // Create new FName.
+            result = new FNameEntryId(_counter++);
+
+            // Store FName.
+            Names[value] = result;
+            NamesReverse[result] = value;
+        }
+
+        return result;
+    }
+}

src/Prospect.Unreal/Core/Names/UnrealNames.cs

@@ -1,5 +1,8 @@
 namespace Prospect.Unreal.Core.Names
 {
+    /// <summary>
+    ///     Hardcoded names in Unreal Engine 4.26.2. See "UnrealNames.inl"
+    /// </summary>
     public static class UnrealNames
     {
         public const int MaxNetworkedHardcodedName = 410;
@@ -217,15 +220,11 @@ namespace Prospect.Unreal.Core.Names
             names.Add(702, "Root");
             
             // Save.
-            Names = names;
+            Names = names.ToDictionary(x => (EName) x.Key, y => y.Value);
-            FNames = Names.ToDictionary(x => (UnrealNameKey) x.Key, y => new FName(y.Value, y.Key));
+            MaxHardcodedNameIndex = (int)Names.Last().Key + 1;
-            MaxHardcodedNameIndex = Names.Last().Key + 1;
         }
 
-        public static IReadOnlyDictionary<int, string> Names { get; }
+        public static IReadOnlyDictionary<EName, string> Names { get; }
-
-        public static IReadOnlyDictionary<UnrealNameKey, FName> FNames { get; }
-        
         public static int MaxHardcodedNameIndex { get; }
     }
 }

src/Prospect.Unreal/Net/Channels/Actor/UActorChannel.cs

@@ -8,7 +8,7 @@ public class UActorChannel : UChannel
     public UActorChannel()
     {
         ChType = EChannelType.CHTYPE_Actor;
-        ChName = UnrealNames.FNames[UnrealNameKey.Actor];
+        ChName = EName.Actor;
         // bClearRecentActorRefs = true;
         // bHoldQueuedExportBunchesAndGUIDs = false;
         // QueuedCloseReason = EChannelCloseReason::Destroyed;

src/Prospect.Unreal/Net/Channels/Control/UControlChannel.cs

@@ -12,7 +12,7 @@ public class UControlChannel : UChannel
     public UControlChannel()
     {
         ChType = EChannelType.CHTYPE_Control;
-        ChName = UnrealNames.FNames[UnrealNameKey.Control];
+        ChName = EName.Control;
     }
 
     protected override void ReceivedBunch(FInBunch bunch)

src/Prospect.Unreal/Net/Channels/Voice/UVoiceChannel.cs

@@ -8,7 +8,7 @@ public class UVoiceChannel : UChannel
     public UVoiceChannel()
     {
         ChType = EChannelType.CHTYPE_Voice;
-        ChName = UnrealNames.FNames[UnrealNameKey.Control];
+        ChName = EName.Voice;
     }
 
     protected override void ReceivedBunch(FInBunch bunch)

src/Prospect.Unreal/Net/FUniqueNetIdRepl.cs

@@ -71,12 +71,7 @@ public class FUniqueNetIdRepl
                         {
                             var typeString = ar.ReadString();
                             var type = new FName(typeString);
-                            // TODO: Add FName into FNamePool
                             throw new NotImplementedException();
-                            if (ar.IsError() || type.Number == (int)UnrealNameKey.None)
-                            {
-                                bValidTypeHash = false;
-                            }
                         }
                         else
                         {
@@ -110,7 +105,7 @@ public class FUniqueNetIdRepl
                     }
                     else
                     {
-                        type = UnrealNames.FNames[UnrealNameKey.None];
+                        type = new FName(EName.None);
                         // TODO: Type = UOnlineEngineInterface::Get()->GetSubsystemFromReplicationHash(TypeHash);
                     }
 

src/Prospect.Unreal/Net/Packets/Bunch/FInBunch.cs

@@ -45,7 +45,7 @@ namespace Prospect.Unreal.Net.Packets.Bunch
             Connection = inConnection;
             ChIndex = 0;
             ChType = EChannelType.CHTYPE_None;
-            ChName = UnrealNames.FNames[UnrealNameKey.None];
+            ChName = EName.None;
             ChSequence = 0;
             bOpen = false;
             bClose = false;

src/Prospect.Unreal/Net/Packets/Bunch/FOutBunch.cs

@@ -8,7 +8,7 @@ public class FOutBunch : FNetBitWriter
 {
     public FOutBunch() : base(0)
     {
-        ChName = UnrealNames.FNames[UnrealNameKey.None];
+        ChName = EName.None;
     }
 
     public FOutBunch(UChannel inChannel, bool bInClose) : base(
@@ -53,7 +53,7 @@ public class FOutBunch : FNetBitWriter
         Time = 0;
         ChIndex = 0;
         ChType = EChannelType.CHTYPE_None;
-        ChName = UnrealNames.FNames[UnrealNameKey.None];
+        ChName = EName.None;
         ChSequence = 0;
         PacketId = 0;
         ReceivedAck = false;

src/Prospect.Unreal/Net/UNetConnection.cs

@@ -90,7 +90,7 @@ public abstract class UNetConnection : UPlayer
     public UNetConnection()
     {
         _channelsToTick = new HashSet<UChannel>();
-        _playerOnlinePlatformName = UnrealNames.FNames[UnrealNameKey.None];
+        _playerOnlinePlatformName = EName.None;
         _packetOrderCache = null;
         _packetOrderCacheStartIdx = 0;
         _packetOrderCacheCount = 0;
@@ -649,13 +649,13 @@ public abstract class UNetConnection : UPlayer
                     switch (bunch.ChType)
                     {
                         case EChannelType.CHTYPE_Control:
-                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Control];
+                            bunch.ChName = EName.Control;
                             break;
                         case EChannelType.CHTYPE_Voice:
-                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Voice];
+                            bunch.ChName = EName.Voice;
                             break;
                         case EChannelType.CHTYPE_Actor:
-                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Actor];
+                            bunch.ChName = EName.Actor;
                             break;
                     }
                 }
@@ -667,32 +667,30 @@ public abstract class UNetConnection : UPlayer
                         
                         if (!UPackageMap.StaticSerializeName(reader, ref chName) || reader.IsError())
                         {
-                            // TODO: Close connection
+                            Close();
                             Logger.Fatal("Channel name serialization failed");
                             return;
                         }
                             
-                        bunch.ChName = chName;
+                        bunch.ChName = chName!.Value;
 
-                        switch ((UnrealNameKey) bunch.ChName.Number)
+                        if (bunch.ChName == EName.Control)
                         {
-                            case UnrealNameKey.Control:
                             bunch.ChType = EChannelType.CHTYPE_Control;
-                                break;
+                        } 
-                                
+                        else if (bunch.ChName == EName.Voice)
-                            case UnrealNameKey.Voice:
+                        {
                             bunch.ChType = EChannelType.CHTYPE_Voice;
-                                break;
+                        }
-                                
+                        else if (bunch.ChName == EName.Actor)
-                            case UnrealNameKey.Actor:
+                        {
                             bunch.ChType = EChannelType.CHTYPE_Actor;
-                                break;
                         }
                     }
                     else
                     {
                         bunch.ChType = EChannelType.CHTYPE_None;
-                        bunch.ChName = UnrealNames.FNames[UnrealNameKey.None];
+                        bunch.ChName = EName.None;
                     }
                 }
                     
@@ -700,12 +698,11 @@ public abstract class UNetConnection : UPlayer
 
                 // If there's an existing channel and the bunch specified it's channel type, make sure they match.
                 if (channel != null &&
-                    (bunch.ChName.Number != (int)UnrealNameKey.None) &&
+                    (bunch.ChName != EName.None) &&
-                    (bunch.ChName.Number != channel.ChName.Number))
+                    (bunch.ChName != channel.ChName))
                 {
-                    Logger.Error("Existing channel at index {ChIndex} with type \"{ChName}\" differs from the incoming bunch's expected channel type, \"{BunchChName}\"", 
+                    Logger.Error("Existing channel at index {ChIndex} with type \"{ChName}\" differs from the incoming bunch's expected channel type, \"{BunchChName}\"", bunch.ChIndex, channel.ChName, bunch.ChName);
-                        bunch.ChIndex, channel.ChName.Str, bunch.ChName.Str);
+                    Close();
-                    // TODO: Close();
                     return;
                 }
 
@@ -714,7 +711,7 @@ public abstract class UNetConnection : UPlayer
                 if (reader.IsError())
                 {
                     Logger.Error("Bunch header overflow");
-                    // TODO: Close();
+                    Close();
                     return;
                 }
                 
@@ -746,27 +743,27 @@ public abstract class UNetConnection : UPlayer
                     Logger.Verbose("  bOpen Bunch, Channel {Ch} Sequence {Seq}: Size {A:###.0}+{B:###.0}", bunch.ChIndex, bunch.ChSequence, (headerPos - incomingStartPos)/8.0f, (reader.GetPosBits()-headerPos)/8.0f);
                 }
 
-                if (Channels[bunch.ChIndex] == null && (bunch.ChIndex != 0 || bunch.ChName != UnrealNames.FNames[UnrealNameKey.Control]))
+                if (Channels[bunch.ChIndex] == null && (bunch.ChIndex != 0 || bunch.ChName != EName.Control))
                 {
                     if (Channels[0] == null)
                     {
                         Logger.Fatal("  Received non-control bunch before control channel was created. ChIndex: {Ch}, ChName: {Name}", bunch.ChIndex, bunch.ChName);
-                        // TODO: Close();
+                        Close();
                         return;
                     } 
                     else if (PlayerController == null && Driver.ClientConnections.Contains(this))
                     {
                         Logger.Fatal("  Received non-control bunch before player controller was assigned. ChIndex: {Ch}, ChName: {Name}", bunch.ChIndex, bunch.ChName);
-                        // TODO: Close();
+                        Close();
                         return;
                     }
                 }
 
                 // ignore control channel close if it hasn't been opened yet
-                if (bunch.ChIndex == 0 && Channels[0] == null && bunch.bClose && bunch.ChName == UnrealNames.FNames[UnrealNameKey.Control])
+                if (bunch.ChIndex == 0 && Channels[0] == null && bunch.bClose && bunch.ChName == EName.Control)
                 {
                     Logger.Fatal("Received control channel close before open");
-                    // Close();
+                    Close();
                     return;
                 }
 
@@ -827,7 +824,7 @@ public abstract class UNetConnection : UPlayer
                     {
                         // Unknown type.
                         Logger.Fatal("Connection unknown channel type ({Name})", bunch.ChName);
-                        // TODO: Close()
+                        Close();
                         return;
                     }
 
@@ -883,7 +880,7 @@ public abstract class UNetConnection : UPlayer
                 if (Driver.IsServer() && (bunch.IsCriticalError() || bunch.IsError()))
                 {
                     Logger.Error("Received corrupted packet data from client {RemoteAddress}.  Disconnecting", LowLevelGetRemoteAddress());
-                    // TODO: Close()
+                    Close();
                     return;
                 }
             }
@@ -1218,7 +1215,7 @@ public abstract class UNetConnection : UPlayer
 
         if (bIsOpenOrReliable)
         {
-            var name = bunch.ChName;
+            var name = (FName?) bunch.ChName;
             UPackageMap.StaticSerializeName(sendBunchHeader, ref name);
         }
         

src/Prospect.Unreal/Net/UNetDriver.cs

@@ -21,9 +21,9 @@ public abstract class UNetDriver : IAsyncDisposable
         ChannelDefinitionMap = new Dictionary<FName, FChannelDefinition>();
         ChannelDefinitions = new List<FChannelDefinition>
         {
-            new FChannelDefinition(UnrealNames.FNames[UnrealNameKey.Control], typeof(string), 0, true, false, true, false, true),
+            new FChannelDefinition(EName.Control, typeof(string), 0, true, false, true, false, true),
-            new FChannelDefinition(UnrealNames.FNames[UnrealNameKey.Voice], typeof(string), 1, true, true, true, true, true),
+            new FChannelDefinition(EName.Voice, typeof(string), 1, true, true, true, true, true),
-            new FChannelDefinition(UnrealNames.FNames[UnrealNameKey.Actor], typeof(string), -1, false, true, false, false, false)
+            new FChannelDefinition(EName.Actor, typeof(string), -1, false, true, false, false, false)
         };
         ClientConnections = new List<UNetConnection>();
         MappedClientConnections = new ConcurrentDictionary<IPEndPoint, UNetConnection>();
@@ -179,11 +179,17 @@ public abstract class UNetDriver : IAsyncDisposable
     {
         // TODO: Pool actor channels (?)
 
-        return (UnrealNameKey)chName.Number switch
+        var name = chName.ToEName();
+        if (name == null)
         {
-            UnrealNameKey.Actor => new UActorChannel(),
+            throw new UnrealNetException($"Unsupported channel name specified {chName}");
-            UnrealNameKey.Control => new UControlChannel(),
+        }
-            UnrealNameKey.Voice => new UVoiceChannel(),
+        
+        return name switch
+        {
+            EName.Actor => new UActorChannel(),
+            EName.Control => new UControlChannel(),
+            EName.Voice => new UVoiceChannel(),
             _ => throw new UnrealNetException($"Attempted to create unknown channel {chName}")
         };
     }

src/Prospect.Unreal/Net/UPackageMap.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics.CodeAnalysis;
 using Prospect.Unreal.Core;
 using Prospect.Unreal.Core.Names;
+using Prospect.Unreal.Exceptions;
 using Prospect.Unreal.Net.Packets.Bunch;
 using Prospect.Unreal.Serialization;
 
@@ -8,7 +9,7 @@ namespace Prospect.Unreal.Net;
 
 public class UPackageMap
 {
-    public static unsafe bool StaticSerializeName(FArchive ar, [MaybeNullWhen(false)] ref FName name)
+    public static unsafe bool StaticSerializeName(FArchive ar, ref FName? name)
     {
         if (ar.IsLoading())
         {
@@ -34,7 +35,7 @@ public class UPackageMap
                 if (nameIndex < UnrealNames.MaxHardcodedNameIndex)
                 {
                     // hardcoded names never have a Number
-                    name = UnrealNames.FNames[(UnrealNameKey) nameIndex];
+                    name = new FName((EName) nameIndex);
                 }
                 else
                 {
@@ -51,17 +52,23 @@ public class UPackageMap
         }
         else
         {
-            var bHardcoded = (byte)(ShouldReplicateAsInteger(name) ? 1 : 0);
+            if (name == null)
+            {
+                throw new UnrealException("Name should not be null when saving");
+            }
+            
+            var inEName = name.Value.ToEName();
+            var bHardcoded = inEName.HasValue && ShouldReplicateAsInteger(inEName.Value) ? 1 : 0;
             ar.SerializeBits(&bHardcoded, 1); // 25
             if (bHardcoded != 0)
             {
-                ar.SerializeIntPacked((uint)name.Number);
+                ar.SerializeIntPacked((uint)inEName!.Value);
             }
             else
             {
                 // send by string
-                var outString = name.Str;
+                var outString = name.Value.GetPlainNameString();
-                var outNumber = name.Number;
+                var outNumber = name.Value.GetNumber();
                 
                 ar.WriteString(outString);
                 ar.WriteInt32(outNumber);
@@ -71,9 +78,9 @@ public class UPackageMap
         return true;
     }
 
-    private static bool ShouldReplicateAsInteger(FName name)
+    private static bool ShouldReplicateAsInteger(EName name)
     {
-        return name.Number <= UnrealNames.MaxNetworkedHardcodedName;
+        return (int)name <= UnrealNames.MaxNetworkedHardcodedName;
     }
 
     public void NotifyBunchCommit(int bunchPacketId, FOutBunch bunch)