PathUtilities.cs

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using System.IO;
 
namespace System.Reflection.Metadata;
 
internal static class PathUtilities
{
    private static string s_platformSpecificDirectorySeparator;
 
    private static string PlatformSpecificDirectorySeparator
    {
        get
        {
            if (s_platformSpecificDirectorySeparator == null)
            {
                s_platformSpecificDirectorySeparator = ((Array.IndexOf(Path.GetInvalidFileNameChars(), '*') >= 0) ? '\\' : '/').ToString();
            }
            return s_platformSpecificDirectorySeparator;
        }
    }
 
    internal static int IndexOfFileName(string path)
    {
        if (path == null)
        {
            return -1;
        }
        for (int num = path.Length - 1; num >= 0; num--)
        {
            char c = path[num];
            if (c == '\\' || c == '/' || c == ':')
            {
                return num + 1;
            }
        }
        return 0;
    }
 
    internal static string GetFileName(string path, bool includeExtension = true)
    {
        int num = IndexOfFileName(path);
        if (num > 0)
        {
            return path.Substring(num);
        }
        return path;
    }
 
    internal static string CombinePathWithRelativePath(string root, string relativePath)
    {
        if (root.Length == 0)
        {
            return relativePath;
        }
        char c = root[root.Length - 1];
        if (c == '\\' || c == '/' || c == ':')
        {
            return root + relativePath;
        }
        return root + PlatformSpecificDirectorySeparator + relativePath;
    }
}