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342 lines
15 KiB
C#
342 lines
15 KiB
C#
/* Copyright (c) Cloud Software Group, Inc.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Based upon code copyrighted as below.
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*/
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/*MIT License
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Copyright (c) 2018 differentrain
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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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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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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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* The minimum requirements for YYProject.XXHash are .NET Framework 3.5, and C# 7.0 ,
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* it means that these code also apply to .NET Core 1.0 or later, Mono 4.6 or later and so on.
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* If necessary, you can also rewrite these library to .NET Framework 2.0 with just a little work.
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* Since all code (XXHash32 and XXHash64) are inside these file independently,
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* I don't recommend using compiled library in your project.
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* Instead, you can just copy the useful parts to your code, this is the benefit of MIT License. P:)
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*
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* If you are using .NET4.5 (or higher) or sibling frameworks, you can add conditional compilation
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* symbol "HIGHER_VERSIONS" to optimize static-short-methods.
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*/
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using System;
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using System.Security.Cryptography;
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#if HIGHER_VERSIONS
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using System.Runtime.CompilerServices;
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#endif
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namespace YYProject.XXHash
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{
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//see details: https://github.com/Cyan4973/xxHash/blob/dev/doc/xxhash_spec.md
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/// <summary>
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/// Represents the class which provides a implementation of the xxHash64 algorithm.
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/// </summary>
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/// <threadsafety static="true" instance="false"/>
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public sealed class XXHash64 : HashAlgorithm
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{
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private const ulong PRIME64_1 = 11400714785074694791UL;
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private const ulong PRIME64_2 = 14029467366897019727UL;
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private const ulong PRIME64_3 = 1609587929392839161UL;
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private const ulong PRIME64_4 = 9650029242287828579UL;
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private const ulong PRIME64_5 = 2870177450012600261UL;
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private static readonly Func<byte[], int, uint> FuncGetLittleEndianUInt32;
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private static readonly Func<byte[], int, ulong> FuncGetLittleEndianUInt64;
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private static readonly Func<ulong, ulong> FuncGetFinalHashUInt64;
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private ulong _Seed64;
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private ulong _ACC64_1;
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private ulong _ACC64_2;
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private ulong _ACC64_3;
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private ulong _ACC64_4;
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private ulong _Hash64;
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private int _RemainingLength;
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private long _TotalLength;
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private int _CurrentIndex;
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private byte[] _CurrentArray;
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static XXHash64()
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{
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if (BitConverter.IsLittleEndian)
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{
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FuncGetLittleEndianUInt32 = new Func<byte[], int, uint>((x, i) =>
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{
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return BitConverter.ToUInt32(x, i);
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});
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FuncGetLittleEndianUInt64 = new Func<byte[], int, ulong>((x, i) =>
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{
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return BitConverter.ToUInt64(x, i);
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});
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FuncGetFinalHashUInt64 = new Func<ulong, ulong>(i => (i & 0x00000000000000FFUL) << 56 | (i & 0x000000000000FF00UL) << 40 | (i & 0x0000000000FF0000UL) << 24 | (i & 0x00000000FF000000UL) << 8 | (i & 0x000000FF00000000UL) >> 8 | (i & 0x0000FF0000000000UL) >> 24 | (i & 0x00FF000000000000UL) >> 40 | (i & 0xFF00000000000000UL) >> 56);
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}
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else
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{
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FuncGetLittleEndianUInt32 = new Func<byte[], int, uint>((array, i) =>
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{
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return (uint)(array[i++] | (array[i++] << 8) | (array[i++] << 16) | (array[i] << 24));
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});
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FuncGetLittleEndianUInt64 = new Func<byte[], int, ulong>((array, i) =>
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{
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return array[i++] | ((ulong)array[i++] << 8) | ((ulong)array[i++] << 16) | ((ulong)array[i++] << 24) | ((ulong)array[i++] << 32) | ((ulong)array[i++] << 40) | ((ulong)array[i++] << 48) | ((ulong)array[i] << 56);
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});
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FuncGetFinalHashUInt64 = new Func<ulong, ulong>(i => i);
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}
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}
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/// <summary>
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/// Creates an instance of <see cref="XXHash64"/> class by default seed(0).
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/// </summary>
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/// <returns></returns>
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public new static XXHash64 Create() => new XXHash64();
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/// <summary>
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/// Creates an instance of the specified implementation of XXHash64 algorithm.
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/// <para>This method always throws <see cref="NotSupportedException"/>. </para>
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/// </summary>
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/// <param name="algName">The hash algorithm implementation to use.</param>
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/// <returns>This method always throws <see cref="NotSupportedException"/>. </returns>
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/// <exception cref="NotSupportedException">This method is not be supported.</exception>
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public new static XXHash64 Create(string algName) => throw new NotSupportedException("This method is not be supported.");
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/// <summary>
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/// Initializes a new instance of the <see cref="XXHash64"/> class by default seed(0).
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/// </summary>
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public XXHash64() => Initialize(0);
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/// <summary>
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/// Initializes a new instance of the <see cref="XXHash64"/> class, and sets the <see cref="Seed"/> to the specified value.
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/// </summary>
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/// <param name="seed">Represent the seed to be used for xxHash64 computing.</param>
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public XXHash64(uint seed) => Initialize(seed);
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/// <summary>
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/// Gets the <see cref="ulong"/> value of the computed hash code.
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/// </summary>
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/// <exception cref="InvalidOperationException">Computation has not yet completed.</exception>
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public ulong HashUInt64 => State == 0 ? _Hash64 : throw new InvalidOperationException("Computation has not yet completed.");
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/// <summary>
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/// Gets or sets the value of seed used by xxHash64 algorithm.
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/// </summary>
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/// <exception cref="InvalidOperationException">Computation has not yet completed.</exception>
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public ulong Seed
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{
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get => _Seed64;
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set
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{
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if (value != _Seed64)
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{
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if (State != 0) throw new InvalidOperationException("Computation has not yet completed.");
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_Seed64 = value;
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Initialize();
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}
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}
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}
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/// <summary>
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/// Initializes this instance for new hash computing.
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/// </summary>
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public override void Initialize()
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{
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_ACC64_1 = _Seed64 + PRIME64_1 + PRIME64_2;
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_ACC64_2 = _Seed64 + PRIME64_2;
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_ACC64_3 = _Seed64 + 0;
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_ACC64_4 = _Seed64 - PRIME64_1;
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}
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/// <summary>
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/// Routes data written to the object into the hash algorithm for computing the hash.
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/// </summary>
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/// <param name="array">The input to compute the hash code for.</param>
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/// <param name="ibStart">The offset into the byte array from which to begin using data.</param>
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/// <param name="cbSize">The number of bytes in the byte array to use as data.</param>
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protected override void HashCore(byte[] array, int ibStart, int cbSize)
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{
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if (State != 1) State = 1;
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var size = cbSize - ibStart;
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_RemainingLength = size & 31;
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if (cbSize >= 32)
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{
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var limit = size - _RemainingLength;
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do
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{
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_ACC64_1 = Round64(_ACC64_1, FuncGetLittleEndianUInt64(array, ibStart));
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ibStart += 8;
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_ACC64_2 = Round64(_ACC64_2, FuncGetLittleEndianUInt64(array, ibStart));
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ibStart += 8;
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_ACC64_3 = Round64(_ACC64_3, FuncGetLittleEndianUInt64(array, ibStart));
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ibStart += 8;
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_ACC64_4 = Round64(_ACC64_4, FuncGetLittleEndianUInt64(array, ibStart));
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ibStart += 8;
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} while (ibStart < limit);
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}
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_TotalLength += cbSize;
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if (_RemainingLength != 0)
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{
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_CurrentArray = array;
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_CurrentIndex = ibStart;
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}
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}
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/// <summary>
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/// Finalizes the hash computation after the last data is processed by the cryptographic stream object.
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/// </summary>
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/// <returns>The computed hash code.</returns>
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protected override byte[] HashFinal()
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{
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if (_TotalLength >= 32)
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{
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#if HIGHER_VERSIONS
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_Hash64 = RotateLeft64_1(_ACC64_1) + RotateLeft64_7(_ACC64_2) + RotateLeft64_12(_ACC64_3) + RotateLeft64_18(_ACC64_4);
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#else
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_Hash64 = RotateLeft64(_ACC64_1, 1) + RotateLeft64(_ACC64_2, 7) + RotateLeft64(_ACC64_3, 12) + RotateLeft64(_ACC64_4, 18);
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#endif
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_Hash64 = MergeRound64(_Hash64, _ACC64_1);
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_Hash64 = MergeRound64(_Hash64, _ACC64_2);
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_Hash64 = MergeRound64(_Hash64, _ACC64_3);
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_Hash64 = MergeRound64(_Hash64, _ACC64_4);
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}
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else
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{
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_Hash64 = _Seed64 + PRIME64_5;
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}
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_Hash64 += (ulong)_TotalLength;
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while (_RemainingLength >= 8)
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{
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#if HIGHER_VERSIONS
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_Hash64 = RotateLeft64_27(_Hash64 ^ Round64(0, FuncGetLittleEndianUInt64(_CurrentArray, _CurrentIndex))) * PRIME64_1 + PRIME64_4;
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#else
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_Hash64 = RotateLeft64(_Hash64 ^ Round64(0, FuncGetLittleEndianUInt64(_CurrentArray, _CurrentIndex)), 27) * PRIME64_1 + PRIME64_4;
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#endif
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_CurrentIndex += 8;
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_RemainingLength -= 8;
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}
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while (_RemainingLength >= 4)
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{
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#if HIGHER_VERSIONS
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_Hash64 = RotateLeft64_23(_Hash64 ^ (FuncGetLittleEndianUInt32(_CurrentArray, _CurrentIndex) * PRIME64_1)) * PRIME64_2 + PRIME64_3;
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#else
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_Hash64 = RotateLeft64(_Hash64 ^ (FuncGetLittleEndianUInt32(_CurrentArray, _CurrentIndex) * PRIME64_1), 23) * PRIME64_2 + PRIME64_3;
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#endif
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_CurrentIndex += 4;
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_RemainingLength -= 4;
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}
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while (_RemainingLength-- >= 1)
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{
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#if HIGHER_VERSIONS
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_Hash64 = RotateLeft64_11(_Hash64 ^ (_CurrentArray[_CurrentIndex++] * PRIME64_5)) * PRIME64_1;
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#else
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_Hash64 = RotateLeft64(_Hash64 ^ (_CurrentArray[_CurrentIndex++] * PRIME64_5), 11) * PRIME64_1;
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#endif
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}
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_Hash64 = (_Hash64 ^ (_Hash64 >> 33)) * PRIME64_2;
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_Hash64 = (_Hash64 ^ (_Hash64 >> 29)) * PRIME64_3;
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_Hash64 ^= _Hash64 >> 32;
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_TotalLength = State = 0;
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return BitConverter.GetBytes(FuncGetFinalHashUInt64(_Hash64));
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}
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#if HIGHER_VERSIONS
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong MergeRound64(ulong input, ulong value) => (input ^ Round64(0, value)) * PRIME64_1 + PRIME64_4;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong Round64(ulong input, ulong value) => RotateLeft64_31(input + (value * PRIME64_2)) * PRIME64_1;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_1(ulong value) => (value << 1) | (value >> 63); // _ACC64_1
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_7(ulong value) => (value << 7) | (value >> 57); // _ACC64_2
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_11(ulong value) => (value << 11) | (value >> 53);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_12(ulong value) => (value << 12) | (value >> 52);// _ACC64_3
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_18(ulong value) => (value << 18) | (value >> 46); // _ACC64_4
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_23(ulong value) => (value << 23) | (value >> 41);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_27(ulong value) => (value << 27) | (value >> 37);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong RotateLeft64_31(ulong value) => (value << 31) | (value >> 33);
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#else
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private static ulong MergeRound64(ulong input, ulong value) => (input ^ Round64(0, value)) * PRIME64_1 + PRIME64_4;
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private static ulong Round64(ulong input, ulong value) => RotateLeft64(input + (value * PRIME64_2), 31) * PRIME64_1;
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private static ulong RotateLeft64(ulong value, int count) => (value << count) | (value >> (64 - count));
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#endif
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private void Initialize(ulong seed)
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{
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HashSizeValue = 64;
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_Seed64 = seed;
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Initialize();
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}
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}
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}
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