Reapply "8.2版本上传"

This reverts commit e9af7221de.

Assets/01.HybridCLR/Editor/3rds/UnityFS/EndianBinaryWriter.cs

@@ -0,0 +1,107 @@
+using System;
+using System.IO;
+
+namespace UnityFS
+{
+    public class EndianBinaryWriter : BinaryWriter
+    {
+        private readonly byte[] buffer;
+
+        public EndianType Endian;
+
+        public EndianBinaryWriter(Stream stream, EndianType endian = EndianType.BigEndian) : base(stream)
+        {
+            Endian = endian;
+            buffer = new byte[8];
+        }
+
+        public long Position
+        {
+            get => BaseStream.Position;
+            set => BaseStream.Position = value;
+        }
+
+        public long Length => BaseStream.Length;
+
+        public override void Write(short x)
+        {
+            Write((ushort)x);
+        }
+
+        private unsafe void WriteBufferBigEndian(byte[] dst, byte* src, int size)
+        {
+            System.Diagnostics.Debug.Assert(BitConverter.IsLittleEndian);
+            for(int i = 0; i < size; i++)
+            {
+                dst[i] = src[size - i - 1];
+            }
+        }
+
+        public unsafe override void Write(ushort x)
+        {
+            if (Endian == EndianType.BigEndian)
+            {
+                WriteBufferBigEndian(buffer, (byte*)&x, 2);
+                Write(buffer, 0, 2);
+                return;
+            }
+            base.Write(x);
+        }
+
+        public override void Write(int x)
+        {
+            Write((uint)x);
+        }
+
+        public unsafe override void Write(uint x)
+        {
+            if (Endian == EndianType.BigEndian)
+            {
+                WriteBufferBigEndian(buffer, (byte*)&x, 4);
+                Write(buffer, 0, 4);
+                return;
+            }
+            base.Write(x);
+        }
+
+        public override void Write(long x)
+        {
+            Write((ulong)x);
+        }
+
+        public unsafe override void Write(ulong x)
+        {
+            if (Endian == EndianType.BigEndian)
+            {
+                WriteBufferBigEndian(buffer, (byte*)&x, 8);
+                Write(buffer, 0, 8);
+                return;
+            }
+            base.Write(x);
+        }
+
+        public override void Write(float x)
+        {
+            if (Endian == EndianType.BigEndian)
+            {
+                var buf = BitConverter.GetBytes(x);
+                Array.Reverse(buf, 0, 4);
+                Write(buf, 0, 4);
+                return;
+            }
+            base.Write(x);
+        }
+
+        public override void Write(double x)
+        {
+            if (Endian == EndianType.BigEndian)
+            {
+                var buf = BitConverter.GetBytes(x);
+                Array.Reverse(buf, 0, 8);
+                Write(buf, 0, 8);
+                return;
+            }
+            base.Write(x);
+        }
+    }
+}