[Add] FishNet

Assets/FishNet/Runtime/Serializing/ReaderPool.cs

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+using FishNet.Managing;
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using GameKit.Dependencies.Utilities;
+
+namespace FishNet.Serializing
+{
+    /// <summary>
+    /// Reader which is reused to save on garbage collection and performance.
+    /// </summary>
+    public sealed class PooledReader : Reader // , IResettable
+    {
+        public PooledReader() { }
+        internal PooledReader(byte[] bytes, NetworkManager networkManager, DataSource source = DataSource.Unset) : base(bytes, networkManager, null, source) { }
+        internal PooledReader(ArraySegment<byte> segment, NetworkManager networkManager, DataSource source = DataSource.Unset) : base(segment, networkManager, null, source) { }
+        public void Store() => ReaderPool.Store(this);
+
+        [Obsolete("Use Clear instead.")]
+        public void ResetState() => Clear();
+
+        [Obsolete("This does not function.")]
+        public void InitializeState() { }
+    }
+
+    /// <summary>
+    /// Collection of PooledReader. Stores and gets PooledReader.
+    /// </summary>
+    public static class ReaderPool
+    {
+        #region Private.
+        /// <summary>
+        /// Pool of readers.
+        /// </summary>
+        private static readonly Stack<PooledReader> _pool = new();
+        #endregion
+
+        /// <summary>
+        /// Get the next reader in the pool
+        /// <para>If pool is empty, creates a new Reader</para>
+        /// </summary>
+        public static PooledReader Retrieve(byte[] bytes, NetworkManager networkManager, Reader.DataSource source = Reader.DataSource.Unset)
+        {
+            return Retrieve(new ArraySegment<byte>(bytes), networkManager, source);
+        }
+
+        /// <summary>
+        /// Get the next reader in the pool or creates a new one if none are available.
+        /// </summary>
+        public static PooledReader Retrieve(ArraySegment<byte> segment, NetworkManager networkManager, Reader.DataSource source = Reader.DataSource.Unset)
+        {
+            PooledReader result;
+            if (_pool.TryPop(out result))
+                result.Initialize(segment, networkManager, source);
+            else
+                result = new(segment, networkManager, source);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Puts reader back into pool
+        /// </summary>
+        public static void Store(PooledReader reader)
+        {
+            _pool.Push(reader);
+        }
+
+        /// <summary>
+        /// Puts reader back into pool if not null, and nullifies source reference.
+        /// </summary>
+        public static void StoreAndDefault(ref PooledReader reader)
+        {
+            if (reader != null)
+            {
+                _pool.Push(reader);
+                reader = null;
+            }
+        }
+    }
+}