84 lines
2.3 KiB
C#
84 lines
2.3 KiB
C#
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/*
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* Copyright (c) 2018 Stanislav Denisov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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#if ENABLE_MONO || ENABLE_IL2CPP
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using UnityEngine.Assertions;
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#endif
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namespace NetStack.Buffers {
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internal static class Utilities {
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[MethodImpl(256)]
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internal static int SelectBucketIndex(int bufferSize) {
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#if ENABLE_MONO || ENABLE_IL2CPP
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Assert.IsTrue(bufferSize > 0);
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#else
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Debug.Assert(bufferSize > 0);
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#endif
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uint bitsRemaining = ((uint)bufferSize - 1) >> 4;
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int poolIndex = 0;
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if (bitsRemaining > 0xFFFF) {
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bitsRemaining >>= 16;
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poolIndex = 16;
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}
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if (bitsRemaining > 0xFF) {
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bitsRemaining >>= 8;
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poolIndex += 8;
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}
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if (bitsRemaining > 0xF) {
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bitsRemaining >>= 4;
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poolIndex += 4;
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}
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if (bitsRemaining > 0x3) {
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bitsRemaining >>= 2;
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poolIndex += 2;
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}
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if (bitsRemaining > 0x1) {
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bitsRemaining >>= 1;
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poolIndex += 1;
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}
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return poolIndex + (int)bitsRemaining;
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}
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[MethodImpl(256)]
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internal static int GetMaxSizeForBucket(int binIndex) {
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int maxSize = 16 << binIndex;
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#if ENABLE_MONO || ENABLE_IL2CPP
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Assert.IsTrue(maxSize >= 0);
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#else
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Debug.Assert(maxSize >= 0);
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#endif
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return maxSize;
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}
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}
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}
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