Endfield??

BeyondTools.VFS/Extensions/StreamExtensions.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeyondTools.VFS.Extensions
+{
+    internal static class StreamExtensions
+    {
+        public static void CopyBytes(this Stream inStream, Stream outStream, long? count = null)
+        {
+            if (count == null)
+            {
+                inStream.CopyTo(outStream);
+                return;
+            }
+
+            long readBytes = 0L;
+            var buffer = new byte[64 * 1024];
+            do
+            {
+                var toRead = Math.Min((long)(count - readBytes), buffer.LongLength);
+                var readNow = inStream.Read(buffer, 0, (int)toRead);
+                if (readNow == 0)
+                    break;
+                outStream.Write(buffer, 0, readNow);
+                readBytes += readNow;
+            } while (readBytes < count);
+        }
+    }
+}