daily update on 20240419 by nitload youmu, SSD merged into main stream

编码器/StgSharpData/Encode/MappingTable.cs

@@ -0,0 +1,156 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace StgSharp.Data
+{
+    public partial class HuffmanTree<T> where T : struct
+    {
+        public Dictionary<T, HuffmanKey<T>> BuildHuffmanDictionary()
+        {
+            Dictionary<T, HuffmanKey<T>> ret = new Dictionary<T, HuffmanKey<T>>();
+            TreeNode<T> root = Root;
+            HuffmanKey<T> key = new HuffmanKey<T>();
+            key = key.SetSide(KeySide.Right);
+            InternalBuildDictionary(ret, root, key);
+            return ret;
+        }
+
+        public void InternalBuildDictionary(
+            Dictionary<T, HuffmanKey<T>> dict,
+            TreeNode<T> node,
+            HuffmanKey<T> valueTemp
+            )
+        {
+            HuffmanKey<T> nativeNode = new HuffmanKey<T>(valueTemp.bitList);
+            nativeNode.AddIndexLevel();
+            //检查左节点
+            if (node._left.Value == null)
+            {
+                //左节点不是叶子节点，继续搜索
+                InternalBuildDictionary(
+                    dict,
+                    node._left,
+                    nativeNode.SetSide(KeySide.Left));
+            }
+            else
+            {
+                //左节点是叶子节点，添加值
+                dict.Add(node._left.Value.Value, nativeNode.SetSide(KeySide.Left));
+            }
+            //检查右节点
+            if (node._right.Value == null)
+            {
+                //右节点不是叶子节点，继续搜索
+                InternalBuildDictionary(
+                    dict,
+                    node._right,
+                    nativeNode.SetSide(KeySide.Right));
+            }
+            else
+            {
+                //右节点是叶子节点，添加值
+                dict.Add(node._right.Value.Value, nativeNode.SetSide(KeySide.Right));
+            }
+            //这里检查自己是不是叶子节点
+            //但是上面已经检查过了，不需要被检查
+        }
+
+    }
+
+
+
+    public class HuffmanKey<T> where T : struct
+    {
+        internal List<bool> bitList;
+        internal BitArray code;
+
+        public HuffmanKey()
+        {
+            bitList = new List<bool>();
+            bitList.Add(false);
+        }
+
+        public HuffmanKey(List<bool> former)
+        {
+            bitList = new List<bool>(former);
+        }
+
+        public unsafe byte[] GetBytes()
+        {
+            byte[] bytes = new byte[bitList.Count / 8 +1];
+            BitArray array = new BitArray(bitList.ToArray());
+            array.CopyTo(bytes, 0);
+            return bytes;
+        }
+
+        public void Freeze()
+        {
+            if (code != null)
+            {
+                return;
+            }
+            bitList.RemoveAt(0); 
+            code = new BitArray(bitList.ToArray());
+        }
+
+        public BitArray GetBitArray()
+        {
+            if (code == null)
+            {
+                List<bool> list = new List<bool>(bitList);
+                list.RemoveAt(0);
+                return new BitArray(list.ToArray());
+            }
+            return code;
+        }
+
+        public unsafe HuffmanKey<T> SetSide(KeySide side)
+        {
+            HuffmanKey<T> newKey = new HuffmanKey<T>(bitList);
+            newKey.bitList[newKey.bitList.Count - 1] = (side == KeySide.Left);
+            return newKey;
+        }
+
+        public unsafe void AddIndexLevel()
+        {
+            bitList.Add(true);
+        }
+
+        public bool IsSupported
+        {
+            get
+            {
+                return
+                    typeof(T) == typeof(byte) ||
+                    typeof(T) == typeof(uint) ||
+                    typeof(T) == typeof(ushort) ||
+                    typeof(T) == typeof(ulong) ||
+#if NET7_0_OR_GREATER
+                    typeof(T) == typeof(UInt128) ||
+#endif
+                    typeof(T) == typeof(M128);
+            }
+        }
+
+        public override string ToString()
+        {
+            string str = "";
+            foreach (var bit in bitList) 
+            {
+                str += $"{bit}   ";
+            }
+            return str;
+        }
+    }
+
+    public enum KeySide
+    {
+        Left,
+        Right
+    }
+
+}