38 lines
1.3 KiB
C#
38 lines
1.3 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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#if NETCORE
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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namespace SharpCompress.Buffers
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{
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internal static class Utilities
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static int SelectBucketIndex(int bufferSize)
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{
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Debug.Assert(bufferSize > 0);
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uint bitsRemaining = ((uint)bufferSize - 1) >> 4;
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int poolIndex = 0;
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if (bitsRemaining > 0xFFFF) { bitsRemaining >>= 16; poolIndex = 16; }
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if (bitsRemaining > 0xFF) { bitsRemaining >>= 8; poolIndex += 8; }
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if (bitsRemaining > 0xF) { bitsRemaining >>= 4; poolIndex += 4; }
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if (bitsRemaining > 0x3) { bitsRemaining >>= 2; poolIndex += 2; }
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if (bitsRemaining > 0x1) { bitsRemaining >>= 1; poolIndex += 1; }
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return poolIndex + (int)bitsRemaining;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static int GetMaxSizeForBucket(int binIndex)
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{
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int maxSize = 16 << binIndex;
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Debug.Assert(maxSize >= 0);
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return maxSize;
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}
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}
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}
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#endif |