61 lines
2.5 KiB
C#
61 lines
2.5 KiB
C#
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using System;
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using System.Buffers;
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using System.Runtime.InteropServices;
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namespace Ryujinx.Memory
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{
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/// <summary>
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/// A concrete implementation of <seealso cref="ReadOnlySequence{Byte}"/>,
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/// with methods to help build a full sequence.
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/// </summary>
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public sealed class BytesReadOnlySequenceSegment : ReadOnlySequenceSegment<byte>
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{
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public BytesReadOnlySequenceSegment(Memory<byte> memory) => Memory = memory;
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public BytesReadOnlySequenceSegment Append(Memory<byte> memory)
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{
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var nextSegment = new BytesReadOnlySequenceSegment(memory)
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{
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RunningIndex = RunningIndex + Memory.Length
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};
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Next = nextSegment;
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return nextSegment;
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}
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/// <summary>
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/// Attempts to determine if the current <seealso cref="Memory{Byte}"/> and <paramref name="other"/> are contiguous.
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/// Only works if both were created by a <seealso cref="NativeMemoryManager{Byte}"/>.
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/// </summary>
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/// <param name="other">The segment to check if continuous with the current one</param>
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/// <param name="contiguousStart">The starting address of the contiguous segment</param>
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/// <param name="contiguousSize">The size of the contiguous segment</param>
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/// <returns>True if the segments are contiguous, otherwise false</returns>
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public unsafe bool IsContiguousWith(Memory<byte> other, out nuint contiguousStart, out int contiguousSize)
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{
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if (MemoryMarshal.TryGetMemoryManager<byte, NativeMemoryManager<byte>>(Memory, out var thisMemoryManager) &&
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MemoryMarshal.TryGetMemoryManager<byte, NativeMemoryManager<byte>>(other, out var otherMemoryManager) &&
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thisMemoryManager.Pointer + thisMemoryManager.Length == otherMemoryManager.Pointer)
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{
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contiguousStart = (nuint)thisMemoryManager.Pointer;
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contiguousSize = thisMemoryManager.Length + otherMemoryManager.Length;
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return true;
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}
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else
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{
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contiguousStart = 0;
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contiguousSize = 0;
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return false;
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}
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}
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/// <summary>
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/// Replaces the current <seealso cref="Memory{Byte}"/> value with the one provided.
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/// </summary>
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/// <param name="memory">The new segment to hold in this <seealso cref="BytesReadOnlySequenceSegment"/></param>
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public void Replace(Memory<byte> memory)
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=> Memory = memory;
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}
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}
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