Deliver/include/Log4CPP8.0/Common.Include/Hash.String.cs

using System;


//-----------------------------------------------------------------------------
//		Hash
//	重点计算字符串的 Hash
//  算法及结果, 与 Hash.String.hpp 完全一致
//-----------------------------------------------------------------------------

internal static class StringHash32
{
	private static readonly UInt32 _FNV_offset_basis_32 = 2166136261U;
	private static readonly UInt32 _FNV_prime_32 = 16777619U;

	internal static UInt32 From (string name)
	{
		var Hash = _FNV_offset_basis_32;
		foreach (var ch in name)
		{
			UInt32 w = ch;
			Hash ^= w;
			Hash *= _FNV_prime_32;
		}

		return Hash;
	}

}


internal static class StringHash64
{
	private static readonly UInt64 _FNV_offset_basis_64 = 14695981039346656037UL;  // 0xcbf29ce484222325
	private static readonly UInt64 _FNV_prime_64 = 1099511628211UL;         // 0x00000100000001b3

	internal static UInt64 From (string name)
	{
		var Hash = _FNV_offset_basis_64;
		foreach (var ch in name)
		{
			UInt64 w = ch;
			Hash ^= w;
			Hash *= _FNV_prime_64;
		}

		return Hash;
	}

}