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StgSharp.Common/HighPerformance/Memory/UnmanagedMemoryHandle.cs

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+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="UnmanagedMemoryHandle.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.Buffers;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.HighPerformance.Memory
+{
+    public unsafe struct UnmanagedMemoryHandle
+    {
+
+        public readonly byte* BufferHandle, AllocatorHandle;
+        public readonly nuint Size;
+
+        public UnmanagedMemoryHandle(byte* pointer, byte* handle, nuint s)
+        {
+            BufferHandle = pointer;
+            AllocatorHandle = handle;
+            Size = s;
+        }
+
+        public readonly ref byte this[nuint index]
+        {
+[MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => ref Unsafe.AddByteOffset(ref Unsafe.AsRef<byte>(BufferHandle), index);
+        }
+
+        public readonly Enumerator GetEnumerator()
+        {
+            return new Enumerator(this);
+        }
+
+        public ref struct Enumerator : IEnumerator<byte>
+        {
+
+            private nuint _index = nuint.MaxValue;
+
+            private UnmanagedMemoryHandle _handle;
+
+            internal Enumerator(UnmanagedMemoryHandle span)
+            {
+                _handle = span;
+            }
+
+            public ref byte RefCurrent => ref _handle[_index];
+
+            public readonly void Dispose() { }
+
+            public bool MoveNext()
+            {
+                _index++;
+                return _index < _handle.Size;
+            }
+
+            public void Reset()
+            {
+                _index = 0;
+            }
+
+            object IEnumerator.Current => RefCurrent;
+
+            byte IEnumerator<byte>.Current => RefCurrent;
+
+        }
+
+    }
+}