bbradson
62 lines
1.4 KiB
C#
62 lines
1.4 KiB
C#
// Copyright (c) 2023 bradson
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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using System.Runtime.CompilerServices;
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using JetBrains.Annotations;
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namespace FisheryLib.Collections;
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[PublicAPI]
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public struct NibbleArray
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{
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private uint _length;
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private byte[] _data;
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public uint this[uint index]
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get
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{
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Guard.IsLessThan(index, _length);
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return (index & 1u) == 0u ? _data[index >> 1] & 0b0000_1111u : (uint)_data[index >> 1] >> 4;
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}
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set
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{
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Guard.IsLessThan(value, 16u);
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Guard.IsLessThan(index, _length);
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_data[index >> 1] = (byte)((index & 1u) == 0u
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? (_data[index >> 1] & 0b1111_0000u) | value
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: (_data[index >> 1] & 0b0000_1111u) | (value << 4));
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}
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}
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public uint Length
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => _length;
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}
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public NibbleArray(uint length)
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{
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_length = length;
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_data = new byte[(length + 1u) >> 1];
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}
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public void Resize(uint newSize)
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{
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_length = newSize;
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Array.Resize(ref _data, (int)(newSize + 1u) >> 1);
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}
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public void Clear() => _data.Clear();
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public void Initialize(uint value)
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{
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Guard.IsLessThan(value, 16u);
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Unsafe.InitBlockUnaligned(ref _data[0u], (byte)(value | (value << 4)), (uint)_data.Length);
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}
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} |