Timerix/DTLib.XXHash
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Added Span api

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This commit is contained in:
Melnik Alexander
2018-09-29 01:02:35 +03:00
parent 4b019f5c48
commit 4b35057191
16 changed files with 428 additions and 290 deletions
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40
src/Standart.Hash.xxHash/xxHash32.cs
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@@ -1,5 +1,9 @@
namespace Standart.Hash.xxHash
{
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
public static partial class xxHash32
{
private const uint p1 = 2654435761U;
@@ -8,7 +12,7 @@
private const uint p4 = 668265263U;
private const uint p5 = 374761393U;
/// <summary>d
/// <summary>
/// Compute xxHash for the data byte array
/// </summary>
/// <param name="data">The source of data</param>
@@ -17,10 +21,39 @@
/// <returns>hash</returns>
public static unsafe uint ComputeHash(byte[] data, int length, uint seed = 0)
{
Debug.Assert(data != null);
Debug.Assert(length >= 0);
Debug.Assert(length <= data.Length);
fixed (byte* pData = &data[0])
{
byte* ptr = pData;
byte* end = pData + length;
return UnsafeComputeHash(pData, length, seed);
}
}
/// <summary>
/// Compute xxHash for the data byte span
/// </summary>
/// <param name="data">The source of data</param>
/// <param name="length">The length of the data for hashing</param>
/// <param name="seed">The seed number</param>
/// <returns>hash</returns>
public static unsafe uint ComputeHash(Span<byte> data, int length, uint seed = 0)
{
Debug.Assert(data != null);
Debug.Assert(length >= 0);
Debug.Assert(length <= data.Length);
fixed (byte* pData = &data[0])
{
return UnsafeComputeHash(pData, length, seed);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static unsafe uint UnsafeComputeHash(byte* ptr, int length, uint seed)
{
byte* end = ptr + length;
uint h32;
if (length >= 16)
@@ -91,7 +124,6 @@
h32 ^= h32 >> 16;
return h32;
}
}
}
}