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Assets/Mirror/Transports/FizzySteamworks/NextCommon.cs

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+#if !DISABLESTEAMWORKS
+using Steamworks;
+using System;
+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace Mirror.FizzySteam
+{
+    public abstract class NextCommon
+    {
+        protected const int MAX_MESSAGES = 256;
+
+        protected EResult SendSocket(HSteamNetConnection conn, byte[] data, int channelId)
+        {
+            Array.Resize(ref data, data.Length + 1);
+            data[data.Length - 1] = (byte)channelId;
+
+            GCHandle pinnedArray = GCHandle.Alloc(data, GCHandleType.Pinned);
+            IntPtr pData = pinnedArray.AddrOfPinnedObject();
+            int sendFlag = channelId == Channels.Unreliable ? Constants.k_nSteamNetworkingSend_Unreliable : Constants.k_nSteamNetworkingSend_Reliable;
+#if UNITY_SERVER
+            EResult res = SteamGameServerNetworkingSockets.SendMessageToConnection(conn, pData, (uint)data.Length, sendFlag, out long _);
+#else
+            EResult res = SteamNetworkingSockets.SendMessageToConnection(conn, pData, (uint)data.Length, sendFlag, out long _);
+#endif
+            if (res != EResult.k_EResultOK)
+            {
+                Debug.LogWarning($"Send issue: {res}");
+            }
+
+            pinnedArray.Free();
+            return res;
+        }
+
+        protected (byte[], int) ProcessMessage(IntPtr ptrs)
+        {
+            SteamNetworkingMessage_t data = Marshal.PtrToStructure<SteamNetworkingMessage_t>(ptrs);
+            byte[] managedArray = new byte[data.m_cbSize];
+            Marshal.Copy(data.m_pData, managedArray, 0, data.m_cbSize);
+            SteamNetworkingMessage_t.Release(ptrs);
+
+            int channel = managedArray[managedArray.Length - 1];
+            Array.Resize(ref managedArray, managedArray.Length - 1);
+            return (managedArray, channel);
+        }
+    }
+}
+#endif // !DISABLESTEAMWORKS