Blind update of zip code to newest RVWorld version

SabreTools.Library/External/Compress/ThreadReaders/ThreadMD5.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Security.Cryptography;
+using System.Threading;
+
+namespace Compress.ThreadReaders
+{
+    public class ThreadMD5 : IDisposable
+    {
+        private readonly AutoResetEvent _waitEvent;
+        private readonly AutoResetEvent _outEvent;
+        private readonly Thread _tWorker;
+
+        private readonly MD5 _md5;
+
+        private byte[] _buffer;
+        private int _size;
+        private bool _finished;
+
+        public ThreadMD5()
+        {
+            _waitEvent = new AutoResetEvent(false);
+            _outEvent = new AutoResetEvent(false);
+            _finished = false;
+            _md5 = MD5.Create();
+
+            _tWorker = new Thread(MainLoop);
+            _tWorker.Start();
+        }
+
+        public byte[] Hash => _md5.Hash;
+
+        public void Dispose()
+        {
+            _waitEvent.Close();
+            _outEvent.Close();
+            // _md5.Dispose();
+        }
+
+        private void MainLoop()
+        {
+            while (true)
+            {
+                _waitEvent.WaitOne();
+                if (_finished)
+                {
+                    break;
+                }
+                _md5.TransformBlock(_buffer, 0, _size, null, 0);
+                _outEvent.Set();
+            }
+
+            byte[] tmp = new byte[0];
+            _md5.TransformFinalBlock(tmp, 0, 0);
+        }
+
+        public void Trigger(byte[] buffer, int size)
+        {
+            _buffer = buffer;
+            _size = size;
+            _waitEvent.Set();
+        }
+
+        public void Wait()
+        {
+            _outEvent.WaitOne();
+        }
+
+
+        public void Finish()
+        {
+            _finished = true;
+            _waitEvent.Set();
+            _tWorker.Join();
+        }
+    }
+}