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75 changes: 75 additions & 0 deletions
75
src/System.Private.Windows.Core/src/System/Collections/Generic/ArrayBuilder.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System.Runtime.CompilerServices; | ||
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| namespace System.Collections.Generic; | ||
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| /// <summary> | ||
| /// Array based collection that tries to avoid copying the internal array and caps the maximum capacity. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <para> | ||
| /// To mitigate corrupted length attacks, the backing array has an initial allocation size cap. | ||
| /// </para> | ||
| /// </remarks> | ||
| internal class ArrayBuilder<T> | ||
| { | ||
| private const int MaxInitialArrayLength = 1024 * 10; | ||
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| private T[] _items; | ||
| private readonly int _maxCount; | ||
| private int _count; | ||
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| /// <param name="expectedCount"> | ||
| /// The <see cref="_count"/> cannot grow past this value and is expected to be this value | ||
| /// when the collection is "finished". | ||
| /// </param> | ||
| internal ArrayBuilder(int expectedCount) | ||
| { | ||
| _items = new T[Math.Min(expectedCount, MaxInitialArrayLength)]; | ||
| _maxCount = expectedCount; | ||
| } | ||
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| [MethodImpl(MethodImplOptions.AggressiveInlining)] | ||
| public void Add(T item) | ||
| { | ||
| T[] array = _items; | ||
| int count = _count; | ||
| if ((uint)count < (uint)_items.Length) | ||
| { | ||
| _count = count + 1; | ||
| array[count] = item; | ||
| } | ||
| else | ||
| { | ||
| AddWithResize(item); | ||
| } | ||
| } | ||
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| private void AddWithResize(T item) | ||
| { | ||
| if (_items.Length == _maxCount) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(item), "Collection is at max capacity."); | ||
| } | ||
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| Debug.Assert(_count == _items.Length); | ||
| int size = _count; | ||
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| Debug.Assert(_items.Length > 0); | ||
| int newCapacity = Math.Min(_maxCount, 2 * _items.Length); | ||
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| Array.Resize(ref _items, newCapacity); | ||
| _count = size + 1; | ||
| _items[size] = item; | ||
| } | ||
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| public T[] ToArray() | ||
| { | ||
| Debug.Assert(_count == _maxCount); | ||
| Debug.Assert(_count == _items.Length); | ||
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| return _items; | ||
| } | ||
| } |
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