diff --git a/Assets/YooAsset/Runtime/Utility/BitMask32.cs b/Assets/YooAsset/Runtime/Utility/BitMask32.cs
deleted file mode 100644
index 4e53740..0000000
--- a/Assets/YooAsset/Runtime/Utility/BitMask32.cs
+++ /dev/null
@@ -1,69 +0,0 @@
-using System;
-
-namespace YooAsset
-{
-    internal struct BitMask32
-    {
-        private int _mask;
-
-        public static implicit operator int(BitMask32 mask) { return mask._mask; }
-        public static implicit operator BitMask32(int mask) { return new BitMask32(mask); }
-
-        public BitMask32(int mask)
-        {
-            _mask = mask;
-        }
-
-        /// <summary>
-        /// 打开位
-        /// </summary>
-        public void Open(int bit)
-        {
-			if (bit < 0 || bit > 31)
-				throw new ArgumentOutOfRangeException();
-            else
-                _mask |= 1 << bit;
-        }
-
-        /// <summary>
-        /// 关闭位
-        /// </summary>
-        public void Close(int bit)
-        {
-            if (bit < 0 || bit > 31)
-				throw new ArgumentOutOfRangeException();
-			else
-                _mask &= ~(1 << bit);
-        }
-
-        /// <summary>
-        /// 位取反
-        /// </summary>
-        public void Reverse(int bit)
-        {
-            if (bit < 0 || bit > 31)
-				throw new ArgumentOutOfRangeException();
-			else
-                _mask ^= 1 << bit;
-        }
-
-		/// <summary>
-		/// 所有位取反
-		/// </summary>
-		public void Inverse()
-		{
-			_mask = ~_mask;
-		}
-
-		/// <summary>
-		/// 比对位值
-		/// </summary>
-		public bool Test(int bit)
-        {
-            if (bit < 0 || bit > 31)
-				throw new ArgumentOutOfRangeException();
-			else
-				return (_mask & (1 << bit)) != 0;
-        }
-    }
-}
\ No newline at end of file
diff --git a/Assets/YooAsset/Runtime/Utility/BitMask32.cs.meta b/Assets/YooAsset/Runtime/Utility/BitMask32.cs.meta
deleted file mode 100644
index 18d1885..0000000
--- a/Assets/YooAsset/Runtime/Utility/BitMask32.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 60c7594328ef976408edadfdf2b9aa3d
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Assets/YooAsset/Runtime/Utility/BitMask64.cs b/Assets/YooAsset/Runtime/Utility/BitMask64.cs
deleted file mode 100644
index 8bfa729..0000000
--- a/Assets/YooAsset/Runtime/Utility/BitMask64.cs
+++ /dev/null
@@ -1,69 +0,0 @@
-using System;
-
-namespace YooAsset
-{
-    internal struct BitMask64
-    {
-        private long _mask;
-
-        public static implicit operator long(BitMask64 mask) { return mask._mask; }
-        public static implicit operator BitMask64(long mask) { return new BitMask64(mask); }
-        
-        public BitMask64(long mask)
-        {
-            _mask = mask;
-        }
-
-        /// <summary>
-        /// 打开位
-        /// </summary>
-        public void Open(int bit)
-        {
-			if (bit < 0 || bit > 63)
-				throw new ArgumentOutOfRangeException();
-            else
-                _mask |= 1L << bit;
-        }
-
-        /// <summary>
-        /// 关闭位
-        /// </summary>
-        public void Close(int bit)
-        {
-            if (bit < 0 || bit > 63)
-				throw new ArgumentOutOfRangeException();
-			else
-                _mask &= ~(1L << bit);
-        }
-
-        /// <summary>
-        /// 位取反
-        /// </summary>
-        public void Reverse(int bit)
-        {
-            if (bit < 0 || bit > 63)
-				throw new ArgumentOutOfRangeException();
-			else
-                _mask ^= 1L << bit;
-        }
-
-		/// <summary>
-		/// 所有位取反
-		/// </summary>
-		public void Inverse()
-		{
-			_mask = ~_mask;
-		}
-
-		/// <summary>
-		/// 比对位值
-		/// </summary>
-		public bool Test(int bit)
-        {
-            if (bit < 0 || bit > 63)
-				throw new ArgumentOutOfRangeException();
-			else
-				return (_mask & (1L << bit)) != 0;
-        }
-    }
-}
\ No newline at end of file
diff --git a/Assets/YooAsset/Runtime/Utility/BitMask64.cs.meta b/Assets/YooAsset/Runtime/Utility/BitMask64.cs.meta
deleted file mode 100644
index 5d62c53..0000000
--- a/Assets/YooAsset/Runtime/Utility/BitMask64.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 6b03684bc5163694ab3983243512b4cc
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: