MindWorkAI/AI-Studio
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Add FNVHash class for 32-bit and 64-bit hash computations

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Thorsten Sommer 2025-04-12 18:02:11 +02:00
parent 55c472d819
commit 3506d3b12c
Signed by: tsommer
GPG Key ID: 371BBA77A02C0108
2 changed files with 63 additions and 0 deletions
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1
app/MindWork AI Studio.sln.DotSettings
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@ -2,6 +2,7 @@
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=AI/@EntryIndexedValue">AI</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=EDI/@EntryIndexedValue">EDI</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=ERI/@EntryIndexedValue">ERI</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=FNV/@EntryIndexedValue">FNV</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=GWDG/@EntryIndexedValue">GWDG</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=LLM/@EntryIndexedValue">LLM</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=LM/@EntryIndexedValue">LM</s:String>

62
app/MindWork AI Studio/Tools/FNVHash.cs Normal file
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// ReSharper disable MemberCanBePrivate.Global
namespace AIStudio.Tools;
/// <summary>
/// Implements the Fowler–Noll–Vo hash function for 32-bit and 64-bit hashes.
/// </summary>
public static class FNVHash
{
private const uint FNV_OFFSET_BASIS_32_BIT = 2_166_136_261;
private const ulong FNV_OFFSET_BASIS_64_BIT = 14_695_981_039_346_656_037;
private const uint FNV_PRIME_32_BIT = 16_777_619;
private const ulong FNV_PRIME_64_BIT = 1_099_511_628_211;
/// <summary>
/// Computes the 32bit FNV-1a hash of a string.
/// </summary>
/// <param name="text">The string to hash.</param>
/// <returns>The 32bit FNV-1a hash of the string.</returns>
public static uint ToFNV32(this string text) => ToFNV32(text.AsSpan());
/// <summary>
/// Computes the 32bit FNV-1a hash of a string.
/// </summary>
/// <param name="text">The string to hash.</param>
/// <returns>The 32bit FNV-1a hash of the string.</returns>
public static uint ToFNV32(this ReadOnlySpan<char> text)
{
var hash = FNV_OFFSET_BASIS_32_BIT;
foreach (var c in text)
{
hash ^= c;
hash *= FNV_PRIME_32_BIT;
}
return hash;
}
/// <summary>
/// Computes the 64bit FNV-1a hash of a string.
/// </summary>
/// <param name="text">The string to hash.</param>
/// <returns>The 64bit FNV-1a hash of the string.</returns>
public static ulong ToFNV64(this string text) => ToFNV64(text.AsSpan());
/// <summary>
/// Computes the 64bit FNV-1a hash of a string.
/// </summary>
/// <param name="text">The string to hash.</param>
/// <returns>The 64bit FNV-1a hash of the string.</returns>
public static ulong ToFNV64(this ReadOnlySpan<char> text)
{
var hash = FNV_OFFSET_BASIS_64_BIT;
foreach (var c in text)
{
hash ^= c;
hash *= FNV_PRIME_64_BIT;
}
return hash;
}
}