add from giga-device, new branch added

2025-08-21 16:51:25 +08:00
commit 43bbc06bbb
1296 changed files with 264186 additions and 0 deletions
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+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="RandomGenerator.cs"
+// Project: StgSharp
+// AuthorGroup: Nitload Space
+// Copyright (c) Nitload Space. All rights reserved.
+//     
+// Permission is hereby granted, free of charge, to any person 
+// obtaining a copy of this software and associated documentation 
+// files (the “Software”), to deal in the Software without restriction, 
+// including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, 
+// and to permit persons to whom the Software is furnished to do so, 
+// subject to the following conditions:
+//     
+// The above copyright notice and 
+// this permission notice shall be included in all copies 
+// or substantial portions of the Software.
+//     
+// THE SOFTWARE IS PROVIDED “AS IS”, 
+// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+// ARISING FROM, OUT OF OR IN CONNECTION WITH 
+// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//     
+// -----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+using StgSharp.HighPerformance;
+
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace StgSharp.Data
+{
+    public unsafe class RandomGenerator
+    {
+
+        private byte[] currentKey;
+        private readonly byte[] originKey;
+
+        public RandomGenerator() : this(DateTime.UtcNow.ToBinary()) { }
+
+        public RandomGenerator(object source)
+        {
+            ArgumentNullException.ThrowIfNull(source);
+            XmlSerializer s = new(source.GetType());
+            using (StringWriter sw = new())
+            {
+                s.Serialize(sw, source);
+                string data = sw.ToString();
+                originKey = Encoding.Unicode.GetBytes(data);
+            }
+            currentKey = [0,0,0,0];
+            fixed (byte* o = originKey, c = currentKey) {
+                *(int*)c = UnsafeCompute.CityHashSimplify((char*)o, 0, originKey.Length / 2);
+            }
+            TotalGeneratedRandom = 0;
+        }
+
+        public int TotalGeneratedRandom
+        {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get;
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            private set;
+        }
+
+        public unsafe int GenRandomInt()
+        {
+            uint source = PrivateRand();
+            TotalGeneratedRandom++;
+            M64 m = new M64();
+            m.Member<uint>(0) = source;
+            m.Member<uint>(1) = source;
+            return (m << (TotalGeneratedRandom % 32)).Member<int>(1);
+        }
+
+        public byte GenRandomInt8()
+        {
+            TotalGeneratedRandom++;
+            if (TotalGeneratedRandom % 4 == 0) {
+                PrivateRand();
+            }
+            return currentKey[TotalGeneratedRandom % 4];
+        }
+
+        public float GenRandomSingle()
+        {
+            TotalGeneratedRandom++;
+
+            while (true)
+            {
+                uint
+                    temp0 = PrivateRand(),
+                    temp1 = PrivateRand();
+
+                if (temp0 * temp1 != 0)
+                {
+                    float ret = temp0 % temp1 * 1.0f / temp1;
+                    if (ret < 0.335f)
+                    {
+                        ret = ret * ((ret * (-0.7811934f)) + 1.4489113f);
+                    } else
+                    {
+                        ret = (ret * ((ret * (-0.1158368f)) + 1.0580600f)) + 0.0590584f;
+                    }
+                    if (ret > 1)
+                    {
+                        continue;
+                    }
+                    return ret;
+                }
+            }
+        }
+
+        public void Reset()
+        {
+            currentKey = originKey;
+            TotalGeneratedRandom = 0;
+        }
+
+        private unsafe uint PrivateRand()
+        {
+            uint ret;
+            fixed (byte* bptr = currentKey)
+            {
+                *(int*)bptr = UnsafeCompute.CityHashSimplify((char*)bptr, currentKey.Length / 2);
+                ret = *(uint*)bptr;
+            }
+
+            // Console.WriteLine(ret.ToString(16));
+            return ret;
+        }
+
+    }
+}