AI-Studio/app/SharedTools/FNVHash.cs
Thorsten Sommer c715b38f41
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Migrated build script to C# (#401)
2025-04-14 19:29:56 +02:00

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// ReSharper disable MemberCanBePrivate.Global
namespace SharedTools;
/// <summary>
/// Implements the FowlerNollVo 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;
}
}