diff --git a/ArgumentReader.cs b/ArgumentReader.cs
new file mode 100644
index 0000000..c290c50
--- /dev/null
+++ b/ArgumentReader.cs
@@ -0,0 +1,37 @@
+using System;
+namespace sharp.extensions
+{
+	public class ArgumentReader
+	{
+		int current;
+		string[] arguments;
+
+		public ArgumentReader(String[] arguments)
+		{
+			this.arguments = arguments;
+			this.current = 0;
+		}
+
+		public String Current { get { return this.arguments[this.current]; } }
+		public String Next() { MoveNext(); return Current; }
+
+		public bool MoveNext(){
+			this.current++;
+			return this.current < this.arguments.Length;
+		}
+
+		public string[] NextFollowing(int n)
+		{
+			string[] result = this.arguments.Segment(this.current + 1, n);
+			this.current += result.Length;
+			return result;
+
+			return new string[0];
+		}
+
+		public string[] Reminder(){
+			return this.arguments.Segment(this.current+1);
+		}
+
+	}
+}
diff --git a/Array.cs b/Array.cs
index 6a1b047..07c6374 100644
--- a/Array.cs
+++ b/Array.cs
@@ -1,4 +1,6 @@
 using System;
+using System.Runtime.CompilerServices;
+using System.Collections.Generic;
 namespace sharp.extensions
 {
 	public static class ArrayExtension
@@ -46,6 +48,9 @@ namespace sharp.extensions
 		}
 		public static T[] Segment<T>(this T[] source,int start,int len){
 			T[] temp = new T[len];
+			if ((start + len) > source.Length){
+				len = source.Length - start;
+			}
 			Array.Copy(source,start,temp,0,len);
 			return temp;
 		}
@@ -82,5 +87,20 @@ namespace sharp.extensions
 			return Insert(a, insert, start, insert.Length);
 		}
 
+		public static T[] Combine<T>(this T[] a,T[] b){
+			T[] r = new T[a.Length + b.Length];
+			Array.Copy(a,r,a.Length);
+			Array.Copy(b,0,r,a.Length,b.Length);
+			return r;
+		}
+			
+		public static T[] Remove<T>(this T[] a,T[] b){
+			List<T> rl = new List<T>(a);
+			foreach (T element in b){
+				rl.Remove(element);
+			}
+			return rl.ToArray();
+		}
+
 	}
 }
diff --git a/ConstructableObject.cs b/ConstructableObject.cs
new file mode 100644
index 0000000..649571b
--- /dev/null
+++ b/ConstructableObject.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Linq;
+using System.Reflection;
+namespace sharp.extensions
+{
+	public class ConstructableObject
+	{
+		public string AssemblyName;
+		public string TypeName;
+		public object[] ConstructorArguments;
+
+		public ConstructableObject(){
+		}
+
+		public ConstructableObject(object o)
+		{
+			Type t = o.GetType();
+
+			TypeName = t.FullName;
+			AssemblyName = t.Assembly.FullName;
+
+			if (t.GetInterfaces().Contains(typeof(IConstructorArguments))){
+				this.ConstructorArguments = ((IConstructorArguments)o).getConstructorArguments();
+			} else {
+				this.ConstructorArguments = new object[0];
+			}
+		}
+
+		public object Construct(){
+			Assembly assy = Assembly.Load(AssemblyName);
+			Type t = assy.GetType(TypeName);
+			object o = Activator.CreateInstance(t, ConstructorArguments);
+			return o;
+		}
+	}
+}
diff --git a/DirectoryExtensions.cs b/DirectoryExtensions.cs
new file mode 100644
index 0000000..4da32e3
--- /dev/null
+++ b/DirectoryExtensions.cs
@@ -0,0 +1,15 @@
+using System;
+using System.IO;
+namespace sharp.extensions
+{
+	public static class DirectoryExtensions
+	{
+
+		public static void EnsureDirectoryExists(string path){
+			if (!Directory.Exists(path)){
+				Directory.CreateDirectory(path);
+			}
+		}
+
+	}
+}
diff --git a/ExtendableThreadPool.cs b/ExtendableThreadPool.cs
new file mode 100644
index 0000000..0078e13
--- /dev/null
+++ b/ExtendableThreadPool.cs
@@ -0,0 +1,174 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Linq;
+namespace sharp.extensions
+{
+	public delegate void TaskDelegate();
+
+	public class ExtendableThreadPool
+	{
+		Stack<ExtendableThread> availableThreads = new Stack<ExtendableThread>();
+		List<ExtendableThread> activeThreads = new List<ExtendableThread>();
+
+		Queue<TaskDelegate> queuedTasks = new Queue<TaskDelegate>();
+
+		public static ThreadLocal<ExtendableThread> CurrentExtendedThread { get; private set; } = new ThreadLocal<ExtendableThread>();
+
+		public int MaximumConcurrentThreads { get; set; } = -1;
+
+		public ExtendableThreadPool()
+		{
+		}
+
+		public void QueueTask(TaskDelegate task){
+			lock(this)
+			{
+				queuedTasks.Enqueue(task);
+				SignalQueue();
+			}
+		}
+
+		private void SignalQueue(){
+			ExtendableThread st;
+
+			lock (this){
+				if (availableThreads.Count > 0){
+					st = availableThreads.Pop();
+					Monitor.Enter(st);
+					Monitor.Pulse(st);
+					Monitor.Exit(st);
+				} else {
+					st = new ExtendableThread(this);
+				}
+			}
+		}
+
+		private TaskDelegate fetchTask(){
+			lock (this){
+				if (queuedTasks.Count == 0){
+					return null;
+				} else {
+					return queuedTasks.Dequeue();
+				}
+			}
+		}
+
+		protected void InvokeTaskDelegate(TaskDelegate task)
+		{
+			try
+			{
+				task.Invoke();
+			}
+			catch (Exception e)
+			{
+				Console.WriteLine("InvokeTaskDelegate:t Task threw exception: {0}", e.ToString());
+			}
+		}
+
+		public class ExtendableThread
+		{
+			Thread thread;
+			bool requestExit;
+			bool isReady;
+
+			public ExtendableThreadPool Pool { get; private set; }
+
+			public ExtendableThread(ExtendableThreadPool pool)
+			{
+				Pool = pool;
+				thread = new Thread(worker);
+				thread.Start();
+			}
+
+			public bool IsReady {
+				get 
+				{
+					lock (this){
+						return isReady;
+					}
+				}
+			}
+
+			public bool ExitRequested {
+				get { lock(this) { return requestExit; } }
+			}
+
+			protected void InvokeTaskDelegate(TaskDelegate task)
+			{
+				Pool.InvokeTaskDelegate(task);
+			}
+
+			private void worker(){
+				ExtendableThreadPool.CurrentExtendedThread.Value = this;
+
+				bool taskAvailable = true;
+
+				while (!ExitRequested){
+					TaskDelegate t;
+
+					while ((t = Pool.fetchTask()) != null)
+					{
+						if (t != null)
+						{
+							InvokeTaskDelegate(t);
+						}
+					}
+
+
+					lock(Pool)
+					{
+						Pool.activeThreads.Remove(this);
+						Pool.availableThreads.Push(this);
+					}
+
+
+					lock(this)
+					{
+						isReady = true;
+
+						while (!Monitor.Wait(this, 250) && !ExitRequested) { }
+
+						if (ExitRequested)
+						{
+							break;
+						}
+					}
+					lock (Pool)
+					{
+						Pool.activeThreads.Add(this);
+					}
+
+				}
+
+				lock(this){
+					Monitor.Pulse(this);
+					isReady = false;
+				}
+			}
+
+			public void Stop()
+			{
+				lock (this)
+				{
+					requestExit = true;
+				}
+			}
+			public void Stop(int timeoutms)
+			{
+				lock (this)
+				{
+					requestExit = true;
+					Monitor.Wait(this, timeoutms);
+					if (thread.IsAlive){
+						thread.Abort();
+					}
+				}
+			}
+
+		}
+
+
+	}
+}
diff --git a/HexString.cs b/HexString.cs
index 7261003..317e66a 100644
--- a/HexString.cs
+++ b/HexString.cs
@@ -5,6 +5,10 @@ namespace sharp.extensions
 {
 	public class HexString
 	{
+		public static byte[] toBytes(char[] hexstring){
+			return toBytes(new String(hexstring));
+		}
+
 		public static byte[] toBytes(string hexstring)
 		{
 			byte[] bytes = new byte[hexstring.Length >> 1];
diff --git a/IConstructorArguments.cs b/IConstructorArguments.cs
new file mode 100644
index 0000000..ab16173
--- /dev/null
+++ b/IConstructorArguments.cs
@@ -0,0 +1,8 @@
+using System;
+namespace sharp.extensions
+{
+	public interface IConstructorArguments
+	{
+		object[] getConstructorArguments();
+	}
+}
diff --git a/LockFile.cs b/LockFile.cs
new file mode 100644
index 0000000..16ddec8
--- /dev/null
+++ b/LockFile.cs
@@ -0,0 +1,78 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Text;
+using System.Diagnostics;
+namespace sharp.extensions
+{
+	public class LockFile
+	{
+		public string LockFileName { get; private set; }
+		public bool IsLocked { get; private set; }
+
+		public int LockCount { get; private set; }
+
+		public LockFile(string filename)
+		{
+			this.LockFileName = filename;
+			this.LockCount = 0;
+		}
+
+		public void Lock()
+		{
+			if (IsLocked){
+				LockCount++;
+				return;
+			}
+
+			int retries = 3;
+
+			Console.WriteLine("wait on lock file {0}", LockFileName);
+
+			for (; retries > 0; retries--)
+			{
+				while (File.Exists(LockFileName))
+				{
+					Thread.Sleep(250);
+				}
+				try
+				{
+					FileStream ls = new FileStream(LockFileName, FileMode.CreateNew);
+					byte[] pid = Encoding.UTF8.GetBytes(Process.GetCurrentProcess().Id.ToString());
+					ls.Write(pid, 0, pid.Length);
+					ls.Close();
+					IsLocked = true;
+					LockCount = 1;
+
+					Console.WriteLine("lock acquired");
+					return;
+				}
+				catch (IOException ioe)
+				{
+				}
+			}
+			ThrowIfUnlocked();
+		}
+
+		public void Unlock()
+		{
+			if (IsLocked)
+			{
+				LockCount--;
+
+				if (LockCount == 0)
+				{
+					File.Delete(LockFileName);
+					IsLocked = false;
+				}
+			}
+		}
+
+		public void ThrowIfUnlocked(){
+			if (!IsLocked){
+				throw new Exception("Lockfile is not locked");
+			}
+		}
+
+	}
+}
diff --git a/ObjectExtensions.cs b/ObjectExtensions.cs
new file mode 100644
index 0000000..6acf6c2
--- /dev/null
+++ b/ObjectExtensions.cs
@@ -0,0 +1,10 @@
+using System;
+namespace sharp.extensions
+{
+	public static class ObjectExtensions
+	{
+		public static bool IsNull(this object o){
+			return (o == null);
+		}
+	}
+}
diff --git a/Pair.cs b/Pair.cs
new file mode 100644
index 0000000..424523d
--- /dev/null
+++ b/Pair.cs
@@ -0,0 +1,21 @@
+using System;
+namespace sharp.extensions
+{
+	public class Pair<T>
+	{
+		public T Item1 { get; set; }
+		public T Item2 { get; set; }
+
+		public Pair(T i1,T i2)
+		{
+			Item1 = i1;
+			Item2 = i2;
+		}
+
+		public override string ToString()
+		{
+			return string.Format("[Pair: Item1={0}, Item2={1}]", Item1, Item2);
+		}
+
+	}
+}
diff --git a/StreamExtensions.cs b/StreamExtensions.cs
new file mode 100644
index 0000000..f8ad3ca
--- /dev/null
+++ b/StreamExtensions.cs
@@ -0,0 +1,25 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace sharp.extensions
+{
+	public static class StreamExtensions
+	{
+		static ASCIIEncoding ascii = new ASCIIEncoding();
+
+		public static string ReadLine(this Stream stream){
+			MemoryStream m = new MemoryStream();
+			int by;
+
+			while ((by = stream.ReadByte()) != 0x0a){
+				if (by != 0x0d){
+					m.WriteByte((byte)by);
+				}
+			}
+
+			return ascii.GetString(m.GetBuffer(),0,(int)m.Length);
+		}
+
+	}
+}
diff --git a/sharp.extensions.csproj b/sharp.extensions.csproj
index 8de292c..da07a2d 100644
--- a/sharp.extensions.csproj
+++ b/sharp.extensions.csproj
@@ -7,7 +7,7 @@
     <OutputType>Library</OutputType>
     <RootNamespace>sharp.extensions</RootNamespace>
     <AssemblyName>sharp.extensions</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -18,6 +18,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
+    <PlatformTarget>x64</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <Optimize>true</Optimize>
@@ -40,6 +41,15 @@
     <Compile Include="Tripple.cs" />
     <Compile Include="Tuple.cs" />
     <Compile Include="CharExtensions.cs" />
+    <Compile Include="Pair.cs" />
+    <Compile Include="StreamExtensions.cs" />
+    <Compile Include="LockFile.cs" />
+    <Compile Include="DirectoryExtensions.cs" />
+    <Compile Include="IConstructorArguments.cs" />
+    <Compile Include="ConstructableObject.cs" />
+    <Compile Include="ExtendableThreadPool.cs" />
+    <Compile Include="ArgumentReader.cs" />
+    <Compile Include="ObjectExtensions.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-</Project>
\ No newline at end of file
+</Project>