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StgSharp.Common/HighPerformance/UnmanagedMemoryPool.IndexNode.cs

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+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="UnmanagedMemoryPool.IndexNode.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 System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Emit;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.HighPerformance
+{
+    public unsafe partial class UnmanagedMemoryPool
+    {
+
+        private const int
+            LevelOf4096 = 4,
+            LevelOf1024 = 3,
+            LevelOf256 = 2,
+            LevelOf64 = 1;
+
+        internal readonly ref struct NextIndexNode
+        {
+
+            private readonly Span<M64> _layout;
+
+            public readonly nuint this[int level]
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => Position - _layout[level].Member<uint>(0);
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                set => _layout[level].Member<uint>(0) = (uint)(Position - value);
+            }
+
+            private readonly ref nuint Position
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => ref _layout[0].Member<nuint>(0);
+            }
+
+        }
+
+        internal readonly ref struct PreviousIndexNode
+        {
+
+            private readonly Span<M64> _layout;
+
+            public readonly nuint this[int level]
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => Position - _layout[level].Member<uint>(1);
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                set => _layout[level].Member<uint>(1) = (uint)(Position - value);
+            }
+
+            private readonly ref nuint Position
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => ref _layout[0].Member<nuint>(0);
+            }
+
+        }
+
+        [StructLayout(LayoutKind.Explicit)]
+        internal readonly ref struct IndexNode
+        {
+
+            private static readonly uint[] _sizeArr = [16, 64, 256, 1024, 4096];
+            [FieldOffset(0)] private readonly NextIndexNode nxt;
+            [FieldOffset(0)] private readonly PreviousIndexNode pre;
+            [FieldOffset(0)] private readonly Span<M64> _layout;
+
+            public IndexNode(ref byte span)
+            {
+                _layout = MemoryMarshal.CreateSpan(ref Unsafe.As<byte, M64>(ref span), 8);
+            }
+
+            public readonly ref nuint Position => ref _layout[0].Member<nuint>(0);
+
+            public readonly ref uint Size => ref _layout[5].Member<uint>(0);
+
+            public readonly ref int Level => ref _layout[5].Member<int>(1);
+
+            public readonly ref nuint Segment => ref _layout[6].Member<nuint>(0);
+
+            public readonly uint BlockSize => LevelToSize(Level);
+
+            public static uint LevelToSize(int level)
+            {
+                return level switch
+                {
+                    < 0 or > 4 => throw new ArgumentOutOfRangeException(
+                        nameof(level), "Level must be from 1 to 4."),
+                    _ => _sizeArr[level]
+                };
+            }
+
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+            public readonly ref readonly NextIndexNode Next
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => ref nxt;
+            }
+
+            public readonly ref readonly PreviousIndexNode Previous
+            {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get => ref pre;
+            }
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+        }
+
+    }
+}