NormNode Refactor

* Updated NormNodeGetAddress to use byte* to avoid casting

* Updated NormNode GetCommand to use fixed statement

* Updated design

src/dotnet/design/Mil/Navy/Nrl/Norm/NormApi.puml

@@ -102,9 +102,9 @@ class NormApi <<static>> {
     + {static} <<extern>> NormDataAccessData(objectHandle:long) : nint
     + {static} <<extern>> NormObjectGetSender(objectHandle:long) : long
     + {static} <<extern>> NormNodeGetId(nodeHandle:long) : long
-    + {static} <<extern>> NormNodeGetAddress(nodeHandle:long, addrBuffer:nint, bufferLen:int, port:int) : bool
+    + <<unsafe>> {static} <<extern>> NormNodeGetAddress(nodeHandle:long, addrBuffer:byte*, bufferLen:int, port:int) : bool
     + {static} <<extern>> NormNodeGetGrtt(nodeHandle:long) : double
-    + {static} <<extern>> NormNodeGetCommand(remoteSender:long, cmdBuffer:nint, buflen:int) : bool
+    + <<unsafe>> {static} <<extern>> NormNodeGetCommand(remoteSender:long, cmdBuffer:byte*, buflen:int) : bool
     + {static} <<extern>> NormNodeFreeBuffers(remoteSender:long) : void
     + {static} <<extern>> NormNodeRetain(nodeHandle:long) : void
     + {static} <<extern>> NormNodeRelease(nodeHandle:long) : void

src/dotnet/src/Mil.Navy.Nrl.Norm/NormApi.cs

@@ -1081,7 +1081,7 @@ namespace Mil.Navy.Nrl.Norm
         /// <param name="port">port number and/or specify a specific source address binding that is used for packet transmission.</param>
         /// <returns>A value of true is returned upon success and false upon failure. An invalid nodeHandle parameter value would lead to such failure.</returns>
         [DllImport(NORM_LIBRARY)]
-        public static extern bool NormNodeGetAddress(long nodeHandle, nint addrBuffer, ref int bufferLen, out int port);
+        public unsafe static extern bool NormNodeGetAddress(long nodeHandle, byte* addrBuffer, ref int bufferLen, out int port);
 
         /// <summary>
         /// This function retrieves the advertised estimate of group round-trip timing (GRTT) for the remote sender referenced by the given nodeHandle value.
@@ -1104,7 +1104,7 @@ namespace Mil.Navy.Nrl.Norm
         /// either no command was available or the provided buffer size (buflen parameter) was inadequate.
         /// The value referenced by the buflen parameter is adjusted to indicate the actual command length (in bytes) upon return.</returns>
         [DllImport(NORM_LIBRARY)]
-        public static extern bool NormNodeGetCommand(long remoteSender, nint cmdBuffer, ref int buflen);
+        public unsafe static extern bool NormNodeGetCommand(long remoteSender, byte* cmdBuffer, ref int buflen);
 
         /// <summary>
         /// This function releases memory resources that were allocated for a remote sender. 

src/dotnet/src/Mil.Navy.Nrl.Norm/NormNode.cs

@@ -1,5 +1,4 @@
 using System.Net;
-using System.Runtime.InteropServices;
 
 namespace Mil.Navy.Nrl.Norm
 {
@@ -48,9 +47,8 @@ namespace Mil.Navy.Nrl.Norm
             {
                 var bufferLength = 256;
                 var buffer = stackalloc byte[bufferLength];
-                var addrBuffer = (nint)buffer;
 
-                if (!NormNodeGetAddress(_handle, addrBuffer, ref bufferLength, out int port))
+                if (!NormNodeGetAddress(_handle, buffer, ref bufferLength, out int port))
                 {
                     throw new IOException("Failed to get node address");
                 }
@@ -81,20 +79,17 @@ namespace Mil.Navy.Nrl.Norm
                 throw new ArgumentOutOfRangeException(nameof(length), "The length is out of range");
             }
 
-            var bufferHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
-
-            try
+            unsafe
             {
-                var bufferPtr = bufferHandle.AddrOfPinnedObject() + offset;
-                if (!NormNodeGetCommand(_handle, bufferPtr, ref length))
+                fixed (byte* bufferPtr = buffer)
                 {
-                    throw new IOException("Failed to get command");
+                    if (!NormNodeGetCommand(_handle, bufferPtr + offset, ref length))
+                    {
+                        throw new IOException("Failed to get command");
+                    }
                 }
-            } 
-            finally
-            {
-                bufferHandle.Free();
             }
+
             return length;
         }
 

src/dotnet/src/Mil.Navy.Nrl.Norm/NormStream.cs

@@ -1,6 +1,4 @@
-using System.Runtime.InteropServices;
-
-namespace Mil.Navy.Nrl.Norm
+namespace Mil.Navy.Nrl.Norm
 {
     /// <summary>
     /// A transport object of type NORM_OBJECT_STREAM.