TitleContainer.cs

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using System;
using System.Globalization;
using System.IO;
 
namespace Microsoft.Xna.Framework;
 
public static class TitleContainer
{
    private static char[] badCharacters = new char[7] { ':', '*', '?', '"', '<', '>', '|' };
 
    public static Stream OpenStream(string name)
    {
        if (string.IsNullOrEmpty(name))
        {
            throw new ArgumentNullException("name");
        }
        name = GetCleanPath(name);
        if (IsCleanPathAbsolute(name))
        {
            throw new ArgumentException(FrameworkResources.InvalidTitleContainerName);
        }
        try
        {
            string uriString = name.Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
            new Uri(uriString, UriKind.Relative);
        }
        catch (Exception innerException)
        {
            throw new ArgumentException(FrameworkResources.InvalidTitleContainerName, innerException);
        }
        try
        {
            string path = Path.Combine(TitleLocation.Path, name);
            return File.OpenRead(path);
        }
        catch (Exception ex)
        {
            if (ex is FileNotFoundException || ex is DirectoryNotFoundException || ex is ArgumentException)
            {
                throw new FileNotFoundException(string.Format(CultureInfo.CurrentCulture, FrameworkResources.OpenStreamNotFound, new object[1] { name }));
            }
            throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, FrameworkResources.OpenStreamError, new object[1] { name }), ex);
        }
    }
 
    internal static bool IsPathAbsolute(string path)
    {
        path = GetCleanPath(path);
        return IsCleanPathAbsolute(path);
    }
 
    internal static string GetCleanPath(string path)
    {
        path = path.Replace('/', '\\');
        path = path.Replace("\\.\\", "\\");
        while (path.StartsWith(".\\"))
        {
            path = path.Substring(".\\".Length);
        }
        while (path.EndsWith("\\."))
        {
            path = ((path.Length <= "\\.".Length) ? "\\" : path.Substring(0, path.Length - "\\.".Length));
        }
        int num;
        for (num = 1; num < path.Length; num = CollapseParentDirectory(ref path, num, "\\..\\".Length))
        {
            num = path.IndexOf("\\..\\", num);
            if (num < 0)
            {
                break;
            }
        }
        if (path.EndsWith("\\.."))
        {
            num = path.Length - "\\..".Length;
            if (num > 0)
            {
                CollapseParentDirectory(ref path, num, "\\..".Length);
            }
        }
        if (path == ".")
        {
            path = string.Empty;
        }
        return path;
    }
 
    private static int CollapseParentDirectory(ref string path, int position, int removeLength)
    {
        int num = path.LastIndexOf('\\', position - 1) + 1;
        path = path.Remove(num, position - num + removeLength);
        return Math.Max(num - 1, 1);
    }
 
    private static bool IsCleanPathAbsolute(string path)
    {
        if (path.IndexOfAny(badCharacters) >= 0)
        {
            return true;
        }
        if (path.StartsWith("\\"))
        {
            return true;
        }
        if (path.StartsWith("..\\") || path.Contains("\\..\\") || path.EndsWith("\\..") || path == "..")
        {
            return true;
        }
        return false;
    }
}