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- #if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
- #pragma warning disable
- using System;
- #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
- using System.Buffers.Binary;
- #endif
- #if NETCOREAPP3_0_OR_GREATER
- using System.Numerics;
- using System.Runtime.Intrinsics.X86;
- #endif
- using Best.HTTP.SecureProtocol.Org.BouncyCastle.Math.Raw;
- namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Utilities
- {
- public static class Longs
- {
- public const int NumBits = 64;
- public const int NumBytes = 8;
- private static readonly byte[] DeBruijnTZ = {
- 0x3F, 0x00, 0x01, 0x34, 0x02, 0x06, 0x35, 0x1A, 0x03, 0x25, 0x28, 0x07, 0x21, 0x36, 0x2F, 0x1B,
- 0x3D, 0x04, 0x26, 0x2D, 0x2B, 0x29, 0x15, 0x08, 0x17, 0x22, 0x3A, 0x37, 0x30, 0x11, 0x1C, 0x0A,
- 0x3E, 0x33, 0x05, 0x19, 0x24, 0x27, 0x20, 0x2E, 0x3C, 0x2C, 0x2A, 0x14, 0x16, 0x39, 0x10, 0x09,
- 0x32, 0x18, 0x23, 0x1F, 0x3B, 0x13, 0x38, 0x0F, 0x31, 0x1E, 0x12, 0x0E, 0x1D, 0x0D, 0x0C, 0x0B };
- public static long HighestOneBit(long i)
- {
- return (long)HighestOneBit((ulong)i);
- }
- [CLSCompliant(false)]
- public static ulong HighestOneBit(ulong i)
- {
- i |= i >> 1;
- i |= i >> 2;
- i |= i >> 4;
- i |= i >> 8;
- i |= i >> 16;
- i |= i >> 32;
- return i - (i >> 1);
- }
- public static long LowestOneBit(long i)
- {
- return i & -i;
- }
- [CLSCompliant(false)]
- public static ulong LowestOneBit(ulong i)
- {
- return (ulong)LowestOneBit((long)i);
- }
- public static int NumberOfLeadingZeros(long i)
- {
- #if NETCOREAPP3_0_OR_GREATER
- if (Lzcnt.X64.IsSupported)
- {
- return (int)Lzcnt.X64.LeadingZeroCount((ulong)i);
- }
- #endif
- int x = (int)(i >> 32), n = 0;
- if (x == 0)
- {
- n = 32;
- x = (int)i;
- }
- return n + Integers.NumberOfLeadingZeros(x);
- }
- public static int NumberOfTrailingZeros(long i)
- {
- #if NETCOREAPP3_0_OR_GREATER
- if (Bmi1.X64.IsSupported)
- {
- return (int)Bmi1.X64.TrailingZeroCount((ulong)i);
- }
- #endif
- int n = DeBruijnTZ[(uint)((ulong)((i & -i) * 0x045FBAC7992A70DAL) >> 58)];
- long m = (((i & 0xFFFFFFFFL) | (long)((ulong)i >> 32)) - 1L) >> 63;
- return n - (int)m;
- }
- public static long Reverse(long i)
- {
- return (long)Reverse((ulong)i);
- }
- [CLSCompliant(false)]
- public static ulong Reverse(ulong i)
- {
- i = Bits.BitPermuteStepSimple(i, 0x5555555555555555UL, 1);
- i = Bits.BitPermuteStepSimple(i, 0x3333333333333333UL, 2);
- i = Bits.BitPermuteStepSimple(i, 0x0F0F0F0F0F0F0F0FUL, 4);
- return ReverseBytes(i);
- }
- public static long ReverseBytes(long i)
- {
- #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
- return BinaryPrimitives.ReverseEndianness(i);
- #else
- return (long)ReverseBytes((ulong)i);
- #endif
- }
- [CLSCompliant(false)]
- public static ulong ReverseBytes(ulong i)
- {
- #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
- return BinaryPrimitives.ReverseEndianness(i);
- #else
- return RotateLeft(i & 0xFF000000FF000000UL, 8) |
- RotateLeft(i & 0x00FF000000FF0000UL, 24) |
- RotateLeft(i & 0x0000FF000000FF00UL, 40) |
- RotateLeft(i & 0x000000FF000000FFUL, 56);
- #endif
- }
- public static long RotateLeft(long i, int distance)
- {
- #if NETCOREAPP3_0_OR_GREATER
- return (long)BitOperations.RotateLeft((ulong)i, distance);
- #else
- return (i << distance) | (long)((ulong)i >> -distance);
- #endif
- }
- [CLSCompliant(false)]
- public static ulong RotateLeft(ulong i, int distance)
- {
- #if NETCOREAPP3_0_OR_GREATER
- return BitOperations.RotateLeft(i, distance);
- #else
- return (i << distance) | (i >> -distance);
- #endif
- }
- public static long RotateRight(long i, int distance)
- {
- #if NETCOREAPP3_0_OR_GREATER
- return (long)BitOperations.RotateRight((ulong)i, distance);
- #else
- return (long)((ulong)i >> distance) | (i << -distance);
- #endif
- }
- [CLSCompliant(false)]
- public static ulong RotateRight(ulong i, int distance)
- {
- #if NETCOREAPP3_0_OR_GREATER
- return BitOperations.RotateRight(i, distance);
- #else
- return (i >> distance) | (i << -distance);
- #endif
- }
- }
- }
- #pragma warning restore
- #endif
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