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2022-04-24 09:05:15 +04:00
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+/*
+ *  Copyright (c) 2018 Stanislav Denisov
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+#if ENABLE_MONO || ENABLE_IL2CPP
+	using UnityEngine.Assertions;
+#endif
+
+namespace NetStack.Buffers {
+	internal static class Utilities {
+		[MethodImpl(256)]
+		internal static int SelectBucketIndex(int bufferSize) {
+			#if ENABLE_MONO || ENABLE_IL2CPP
+				Assert.IsTrue(bufferSize > 0);
+			#else
+				Debug.Assert(bufferSize > 0);
+			#endif
+
+			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(256)]
+		internal static int GetMaxSizeForBucket(int binIndex) {
+			int maxSize = 16 << binIndex;
+
+			#if ENABLE_MONO || ENABLE_IL2CPP
+				Assert.IsTrue(maxSize >= 0);
+			#else
+				Debug.Assert(maxSize >= 0);
+			#endif
+
+			return maxSize;
+		}
+	}
+}