MusicTool/CueSplitter/Helpers/FilenameHelper.cs

using System.Collections.Generic;
using System.IO;
using System.Text;

namespace CueSplitter.Helpers
{
    internal static class FilenameHelper
    {
        private static char[] _invalidCharacters=null;

        private static char[] GetInvalidCharacters()
        {
            var invalidChars = new List<char>();
            invalidChars.AddRange(Path.GetInvalidFileNameChars());
            invalidChars.AddRange(Path.GetInvalidPathChars());
            return invalidChars.ToArray();
        }

        public static char[] InvalidCharacters => _invalidCharacters ??= GetInvalidCharacters();

        public static string RemoveInvalidCharacters(string content, char replace = '_', bool doNotReplaceBackslashes = false)
        {
            if (string.IsNullOrEmpty(content))
                return content;

            var idx = content.IndexOfAny(InvalidCharacters);
            if (idx >= 0)
            {
                var sb = new StringBuilder(content);
                while (idx >= 0)
                {
                    if (sb[idx] != '\\' || !doNotReplaceBackslashes)
                        sb[idx] = replace;
                    idx = content.IndexOfAny(InvalidCharacters, idx + 1);
                }
                return sb.ToString();
            }
            return content;
        }
    }
}