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