ErsatzTV/ErsatzTV.Core/Extensions/StringExtensions.cs

namespace ErsatzTV.Core.Extensions;

public static class StringExtensions
{
    public static int GetStableHashCode(this string str)
    {
        unchecked
        {
            var hash1 = 5381;
            int hash2 = hash1;

            for (var i = 0; i < str.Length && str[i] != '\0'; i += 2)
            {
                hash1 = ((hash1 << 5) + hash1) ^ str[i];
                if (i == str.Length - 1 || str[i + 1] == '\0')
                {
                    break;
                }

                hash2 = ((hash2 << 5) + hash2) ^ str[i + 1];
            }

            return hash1 + hash2 * 1566083941;
        }
    }
}