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ryujinx-final/Ryujinx.Audio/Renderer/Utils/BitArray.cs
Mary-nyan 1825bd87b4
misc: Reformat Ryujinx.Audio with dotnet-format (#3485)
This is the first commit of a series of reformat around the codebase as
discussed internally some weeks ago.

This project being one that isn't touched that much, it shouldn't cause
conflict with any opened PRs.
2022-07-25 15:46:33 -03:00

103 lines
No EOL
3.3 KiB
C#

using System;
using System.Runtime.CompilerServices;
namespace Ryujinx.Audio.Renderer.Utils
{
/// <summary>
/// A simple bit array implementation backed by a <see cref="Memory{T}"/>.
/// </summary>
public class BitArray
{
/// <summary>
/// The backing storage of the <see cref="BitArray"/>.
/// </summary>
private Memory<byte> _storage;
/// <summary>
/// Create a new <see cref="BitArray"/> from <see cref="Memory{T}"/>.
/// </summary>
/// <param name="storage">The backing storage of the <see cref="BitArray"/>.</param>
public BitArray(Memory<byte> storage)
{
_storage = storage;
}
/// <summary>
/// Get the byte position of a given bit index.
/// </summary>
/// <param name="index">A bit index.</param>
/// <returns>The byte position of a given bit index.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static int ToPosition(int index) => index / 8;
/// <summary>
/// Get the bit position of a given bit index inside a byte.
/// </summary>
/// <param name="index">A bit index.</param>
/// <returns>The bit position of a given bit index inside a byte.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static int ToBitPosition(int index) => index % 8;
/// <summary>
/// Test if the bit at the given index is set.
/// </summary>
/// <param name="index">A bit index.</param>
/// <returns>Return true if the bit at the given index is set</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool Test(int index)
{
ulong mask = 1ul << ToBitPosition(index);
return (_storage.Span[ToPosition(index)] & mask) == mask;
}
/// <summary>
/// Set the bit at the given index.
/// </summary>
/// <param name="index">A bit index.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Set(int index)
{
Set(index, true);
}
/// <summary>
/// Reset the bit at the given index.
/// </summary>
/// <param name="index">A bit index.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Reset(int index)
{
Set(index, false);
}
/// <summary>
/// Set a bit value at the given index.
/// </summary>
/// <param name="index">A bit index.</param>
/// <param name="value">The new bit value.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void Set(int index, bool value)
{
byte mask = (byte)(1 << ToBitPosition(index));
if (value)
{
_storage.Span[ToPosition(index)] |= mask;
}
else
{
_storage.Span[ToPosition(index)] &= (byte)~mask;
}
}
/// <summary>
/// Reset all bits in the storage.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Reset()
{
_storage.Span.Fill(0);
}
}
}