forked from Mirror/Ryujinx
123 lines
4.1 KiB
C#
123 lines
4.1 KiB
C#
using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace Ryujinx.Common.Memory
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{
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/// <summary>
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/// Represents an array of unmanaged resources.
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/// </summary>
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/// <typeparam name="T">Array element type</typeparam>
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public unsafe struct ArrayPtr<T> : IEquatable<ArrayPtr<T>>, IArray<T> where T : unmanaged
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{
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private IntPtr _ptr;
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/// <summary>
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/// Null pointer.
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/// </summary>
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public static ArrayPtr<T> Null => new ArrayPtr<T>() { _ptr = IntPtr.Zero };
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/// <summary>
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/// True if the pointer is null, false otherwise.
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/// </summary>
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public bool IsNull => _ptr == IntPtr.Zero;
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/// <summary>
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/// Number of elements on the array.
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/// </summary>
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public int Length { get; }
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/// <summary>
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/// Gets a reference to the item at the given index.
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/// </summary>
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/// <remarks>
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/// No bounds checks are performed, this allows negative indexing,
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/// but care must be taken if the index may be out of bounds.
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/// </remarks>
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/// <param name="index">Index of the element</param>
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/// <returns>Reference to the element at the given index</returns>
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public ref T this[int index] => ref Unsafe.AsRef<T>((T*)_ptr + index);
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/// <summary>
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/// Creates a new array from a given reference.
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/// </summary>
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/// <remarks>
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/// For data on the heap, proper pinning is necessary during
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/// use. Failure to do so will result in memory corruption and crashes.
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/// </remarks>
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/// <param name="value">Reference of the first array element</param>
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/// <param name="length">Number of elements on the array</param>
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public ArrayPtr(ref T value, int length)
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{
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_ptr = (IntPtr)Unsafe.AsPointer(ref value);
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Length = length;
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}
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/// <summary>
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/// Creates a new array from a given pointer.
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/// </summary>
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/// <param name="ptr">Array base pointer</param>
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/// <param name="length">Number of elements on the array</param>
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public ArrayPtr(T* ptr, int length)
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{
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_ptr = (IntPtr)ptr;
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Length = length;
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}
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/// <summary>
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/// Creates a new array from a given pointer.
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/// </summary>
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/// <param name="ptr">Array base pointer</param>
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/// <param name="length">Number of elements on the array</param>
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public ArrayPtr(IntPtr ptr, int length)
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{
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_ptr = ptr;
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Length = length;
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}
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/// <summary>
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/// Splits the array starting at the specified position.
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/// </summary>
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/// <param name="start">Index where the new array should start</param>
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/// <returns>New array starting at the specified position</returns>
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public ArrayPtr<T> Slice(int start) => new ArrayPtr<T>(ref this[start], Length - start);
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/// <summary>
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/// Gets a span from the array.
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/// </summary>
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/// <returns>Span of the array</returns>
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public Span<T> AsSpan() => Length == 0 ? Span<T>.Empty : MemoryMarshal.CreateSpan(ref this[0], Length);
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/// <summary>
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/// Gets the array base pointer.
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/// </summary>
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/// <returns>Base pointer</returns>
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public T* ToPointer() => (T*)_ptr;
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public override bool Equals(object obj)
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{
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return obj is ArrayPtr<T> other && Equals(other);
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}
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public bool Equals([AllowNull] ArrayPtr<T> other)
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{
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return _ptr == other._ptr && Length == other.Length;
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}
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public override int GetHashCode()
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{
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return HashCode.Combine(_ptr, Length);
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}
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public static bool operator ==(ArrayPtr<T> left, ArrayPtr<T> right)
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{
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return left.Equals(right);
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}
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public static bool operator !=(ArrayPtr<T> left, ArrayPtr<T> right)
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{
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return !(left == right);
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}
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}
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}
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