diff --git a/GameRes/ByteArray.cs b/GameRes/ByteArray.cs
index b9352405..21bf900d 100644
--- a/GameRes/ByteArray.cs
+++ b/GameRes/ByteArray.cs
@@ -140,17 +140,17 @@ namespace GameRes
 
     public static class ByteArrayExt
     {
-        public static ushort ToUInt16 (this CowArray<byte> arr, int index)
+        public static ushort ToUInt16<TArray> (this TArray arr, int index) where TArray : IList<byte>
         {
             return (ushort)(arr[index] | arr[index+1] << 8);
         }
 
-        public static short ToInt16 (this CowArray<byte> arr, int index)
+        public static short ToInt16<TArray> (this TArray arr, int index) where TArray : IList<byte>
         {
             return (short)(arr[index] | arr[index+1] << 8);
         }
 
-        public static int ToInt24 (this CowArray<byte> arr, int index)
+        public static int ToInt24<TArray> (this TArray arr, int index) where TArray : IList<byte>
         {
             return arr[index] | arr[index+1] << 8 | arr[index+2] << 16;
         }
@@ -165,26 +165,29 @@ namespace GameRes
             return (int)ToUInt32 (arr, index);
         }
 
-        public static ulong ToUInt64 (this CowArray<byte> arr, int index)
+        public static ulong ToUInt64<TArray> (this TArray arr, int index) where TArray : IList<byte>
         {
             return (ulong)ToUInt32 (arr, index) | ((ulong)ToUInt32 (arr, index+4) << 32);
         }
 
-        public static long ToInt64 (this CowArray<byte> arr, int index)
+        public static long ToInt64<TArray> (this TArray arr, int index) where TArray : IList<byte>
         {
             return (long)ToUInt64 (arr, index);
         }
 
-        public static bool AsciiEqual (this CowArray<byte> arr, int index, string str)
+        public static bool AsciiEqual<TArray> (this TArray arr, int index, string str) where TArray : IList<byte>
         {
-            arr.Reclaim();
-            return Binary.AsciiEqual (arr.ToArray(), index, str);
+            if (arr.Length-index < str.Length)
+                return false;
+            for (int i = 0; i < str.Length; ++i)
+                if ((char)arr[index+i] != str[i])
+                    return false;
+            return true;
         }
 
-        public static bool AsciiEqual (this CowArray<byte> arr, string str)
+        public static bool AsciiEqual<TArray> (this TArray arr, string str) where TArray : IList<byte>
         {
-            arr.Reclaim();
-            return Binary.AsciiEqual (arr.ToArray(), str);
+            return arr.AsciiEqual (0, str);
         }
 
         public static string GetCString (this CowArray<byte> arr, int index, int length_limit)