Add ultimate xr

Assets/UltimateXR/Runtime/Scripts/Extensions/System/GuidExt.cs

@@ -0,0 +1,63 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="GuidExt.cs" company="VRMADA">
+//   Copyright (c) VRMADA, All rights reserved.
+// </copyright>
+// --------------------------------------------------------------------------------------------------------------------
+using System;
+using System.Security.Cryptography;
+
+namespace UltimateXR.Extensions.System
+{
+    public static class GuidExt
+    {
+        #region Public Methods
+
+        /// <summary>
+        ///     Throws an exception if the object has the default Guid.
+        /// </summary>
+        /// <param name="self">Guid to check</param>
+        /// <param name="paramName">Parameter name, used as argument for the exception message or null to not use it</param>
+        /// <exception cref="ArgumentNullException">Thrown if the object is the default Guid (default or <see cref="Guid.Empty" />)</exception>
+        public static void ThrowIfDefault(this Guid self, string paramName)
+        {
+            if (self == Guid.Empty)
+            {
+                if (paramName == null)
+                {
+                    throw new Exception("Guid cannot be empty");
+                }
+                
+                throw new Exception($"Guid is empty for parameter {paramName}");
+            }
+        }
+
+        /// <summary>
+        ///     Combines two Guid instances to create a new unique Guid.
+        /// </summary>
+        /// <param name="guid1">The first Guid to combine</param>
+        /// <param name="guid2">The second Guid to combine</param>
+        /// <returns>A new Guid that is a combination of the input Guids</returns>
+        public static Guid Combine(Guid guid1, Guid guid2)
+        {
+            byte[] bytes1 = guid1.ToByteArray();
+            byte[] bytes2 = guid2.ToByteArray();
+
+            // Concatenate the byte arrays
+            byte[] combinedBytes = new byte[bytes1.Length + bytes2.Length];
+            Buffer.BlockCopy(bytes1, 0, combinedBytes, 0,             bytes1.Length);
+            Buffer.BlockCopy(bytes2, 0, combinedBytes, bytes1.Length, bytes2.Length);
+
+            // Use SHA-256 hash function to generate a unique hash
+            using SHA256 sha256    = SHA256.Create();
+            byte[]       hashBytes = sha256.ComputeHash(combinedBytes);
+
+            // Take the first 16 bytes of the hash to create a new Guid
+            byte[] guidBytes = new byte[16];
+            Buffer.BlockCopy(hashBytes, 0, guidBytes, 0, guidBytes.Length);
+
+            return new Guid(guidBytes);
+        }
+
+        #endregion
+    }
+}