C# Class openHistorian.PerformanceTests.GuidSHA1Helper

This class is a helper class to quickly generate a strong hash code for a GUID type.

A strong hash function is important in Dictionary Lookups. If the hash is sufficently strong, a mod operation over the largest prime can be avoided, thus allowing for faster customized dictionary lookups. Method is the same as taking the last 4 bytes of a SHA1 hashsum, except zero is reserved and converted to 1.

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Public Methods

Method	Description
ComputeHash ( System.Guid input ) : int

Private Methods

Method	Description
InternalHashBlock ( uint hash, uint words ) : void	Computes the hash of the blocks. Words must already be in big endian format.
SwapEndianSha ( ulong src, ulong dst ) : void

Method Details

ComputeHash() public static method

public static ComputeHash ( System.Guid input ) : int
input	System.Guid
return	int