Implement buffer copy using different policies (#1599)

use Memory-Copy Co-authored-by: Christian <6939810+chkr1011@users.noreply.github.com>
2026-10-20 19:58:57 +08:00 · 2022-12-03 13:17:02 +01:00
parent 27f2474876
commit 862d76471b
7 changed files with 81 additions and 10 deletions
@@ -0,0 +1,29 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace MQTTnet.Internal
+{
+    public static class Memory
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Copy(byte[] source, int sourceIndex, byte[] destination, int destinationIndex, int length)
+        {
+#if NETCOREAPP3_1_OR_GREATER || NETSTANDARD2_1
+            source.AsSpan(sourceIndex, length).CopyTo(destination.AsSpan(destinationIndex, length));
+#elif NET461_OR_GREATER || NETSTANDARD1_3_OR_GREATER
+            unsafe
+            {
+                fixed (byte* pSoure = &source[sourceIndex])
+                {
+                    fixed (byte* pDestination = &destination[destinationIndex])
+                    {
+                        System.Buffer.MemoryCopy(pSoure, pDestination, length, length);
+                    }
+                }
+            }
+#else
+            Array.Copy(source, sourceIndex, destination, destinationIndex, length);
+#endif
+        }
+    }
+}