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