上传YomovSDK

Packages/com.firstgeargames.fishnet/Plugins/GameKit/Utilities/Hashing.cs

@@ -0,0 +1,85 @@
+namespace GameKit.Utilities
+{
+
+    public static class Hashing
+    {
+
+        private const uint FNV_offset_basis32 = 2166136261;
+        private const uint FNV_prime32 = 16777619;
+        private const ulong FNV_offset_basis64 = 14695981039346656037;
+        private const ulong FNV_prime64 = 1099511628211;
+
+
+        /// <summary>
+        /// non cryptographic stable hash code,  
+        /// it will always return the same hash for the same
+        /// string.  
+        /// 
+        /// This is simply an implementation of FNV-1 32 bit xor folded to 16 bit
+        /// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
+        /// </summary>
+        /// <returns>The stable hash32.</returns>
+        /// <param name="txt">Text.</param>
+        public static ushort GetStableHashU16(this string txt)
+        {
+            uint hash32 = txt.GetStableHashU32();
+
+            return (ushort)((hash32 >> 16) ^ hash32);
+        }
+
+
+        /// <summary>
+        /// non cryptographic stable hash code,  
+        /// it will always return the same hash for the same
+        /// string.  
+        /// 
+        /// This is simply an implementation of FNV-1 32 bit
+        /// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
+        /// </summary>
+        /// <returns>The stable hash32.</returns>
+        /// <param name="txt">Text.</param>
+        public static uint GetStableHashU32(this string txt)
+        {
+            unchecked
+            {
+                uint hash = FNV_offset_basis32;
+                for (int i = 0; i < txt.Length; i++)
+                {
+                    uint ch = txt[i];
+                    hash = hash * FNV_prime32;
+                    hash = hash ^ ch;
+                }
+                return hash;
+            }
+        }
+
+        /// <summary>
+        /// non cryptographic stable hash code,  
+        /// it will always return the same hash for the same
+        /// string.  
+        /// 
+        /// This is simply an implementation of FNV-1  64 bit
+        /// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
+        /// </summary>
+        /// <returns>The stable hash32.</returns>
+        /// <param name="txt">Text.</param>
+        public static ulong GetStableHashU64(this string txt)
+        {
+            unchecked
+            {
+                ulong hash = FNV_offset_basis64;
+                for (int i = 0; i < txt.Length; i++)
+                {
+                    ulong ch = txt[i];
+                    hash = hash * FNV_prime64;
+                    hash = hash ^ ch;
+                }
+                return hash;
+            }
+        }
+
+
+    }
+
+
+}