C&C Remastered Map Editor

Initial commit of C&C Remastered Map Editor code

CnCTDRAMapEditor/Utility/CRC.cs

@@ -0,0 +1,60 @@
+//
+// Copyright 2020 Electronic Arts Inc.
+//
+// The Command & Conquer Map Editor and corresponding source code is free 
+// software: you can redistribute it and/or modify it under the terms of 
+// the GNU General Public License as published by the Free Software Foundation, 
+// either version 3 of the License, or (at your option) any later version.
+
+// The Command & Conquer Map Editor and corresponding source code is distributed 
+// in the hope that it will be useful, but with permitted additional restrictions 
+// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 
+// distributed with this program. You should have received a copy of the 
+// GNU General Public License along with permitted additional restrictions 
+// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
+using System;
+
+namespace MobiusEditor.Utility
+{
+    public class CRC
+    {
+        static CRC()
+        {
+            for (var i = 0U; i < 256U; ++i)
+            {
+                uint crc = i;
+                for (var j = 0U; j < 8U; ++j)
+                {
+                    if ((crc & 1U) != 0U)
+                    {
+                        crc = (crc >> 1) ^ polynomial;
+                    }
+                    else
+                    {
+                        crc >>= 1;
+                    }
+                }
+                crcTable[i] = crc;
+            }
+        }
+
+        public static uint Calculate(byte[] bytes)
+        {
+            if (bytes == null)
+            {
+                throw new ArgumentNullException("bytes");
+            }
+
+            uint remainder = 0xFFFFFFFFU;
+            for (var i = 0; i < bytes.Length; ++i)
+            {
+                uint index = (remainder & 0xFF) ^ bytes[i];
+                remainder = (remainder >> 8) ^ crcTable[index];
+            }
+            return ~remainder;
+        }
+
+        private static readonly uint[] crcTable = new uint[256];
+        private const uint polynomial = 0xEDB88320;
+    }
+}