Blind update of zip code to newest RVWorld version

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

@@ -0,0 +1,72 @@
+using System;
+using System.Threading;
+
+namespace Compress.ThreadReaders
+{
+    public class ThreadCRC : IDisposable
+    {
+        private Utils.CRC crc; 
+        private readonly AutoResetEvent _waitEvent;
+        private readonly AutoResetEvent _outEvent;
+        private readonly Thread _tWorker;
+
+        private byte[] _buffer;
+        private int _size;
+        private bool _finished;
+
+
+        public ThreadCRC()
+        {
+            crc=new Utils.CRC();
+            _waitEvent = new AutoResetEvent(false);
+            _outEvent = new AutoResetEvent(false);
+            _finished = false;
+
+            _tWorker = new Thread(MainLoop);
+            _tWorker.Start();
+        }
+
+        public byte[] Hash => crc.Crc32ResultB;
+
+        public void Dispose()
+        {
+            _waitEvent.Dispose();
+            _outEvent.Dispose();
+        }
+
+        private void MainLoop()
+        {
+            while (true)
+            {
+                _waitEvent.WaitOne();
+                if (_finished)
+                {
+                    break;
+                }
+
+                crc.SlurpBlock(_buffer,0,_size);
+
+                _outEvent.Set();
+            }
+        }
+
+        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();
+        }
+    }
+}