initial commit

Library/PackageCache/com.unity.scriptablebuildpipeline@1.21.5/Editor/Utilities/SpookyHash.cs

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+#if UNITY_2019_3_OR_NEWER
+using System.Security.Cryptography;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine;
+
+namespace UnityEditor.Build.Pipeline.Utilities
+{
+    public unsafe sealed class SpookyHash : HashAlgorithm
+    {
+        Hash128 m_Hash;
+
+        SpookyHash()
+        {
+            Initialize();
+        }
+
+        public new static SpookyHash Create()
+        {
+            return new SpookyHash();
+        }
+
+        public override void Initialize() {}
+
+        protected override void HashCore(byte[] inputBuffer, int inputOffset, int inputCount)
+        {
+            if (inputBuffer == null || inputOffset < 0 || inputCount <= 0 || (inputCount > inputBuffer.Length) || (inputBuffer.Length - inputCount) < inputOffset)
+                return;
+
+#if UNITY_2020_1_OR_NEWER
+            m_Hash.Append(inputBuffer, inputOffset, inputCount);
+#else
+            throw new System.InvalidOperationException("SpookyHash implementation was unstable and not deterministic prior to Unity 2020.1. Use MD5 or MD4 instead.");
+#endif
+        }
+
+        protected override byte[] HashFinal()
+        {
+#if UNITY_2020_1_OR_NEWER
+            byte[] results = new byte[UnsafeUtility.SizeOf<Hash128>()];
+            byte* hashPtr = (byte*)UnsafeUtility.AddressOf(ref m_Hash);
+            fixed(byte* d = results)
+            UnsafeUtility.MemCpy(d, hashPtr, results.Length);
+            return results;
+#else
+            throw new System.InvalidOperationException("SpookyHash implementation was unstable and not deterministic prior to Unity 2020.1. Use MD5 or MD4 instead.");
+#endif
+        }
+    }
+}
+#endif