343 lines
11 KiB
C#
343 lines
11 KiB
C#
using MediaBrowser.Common.IO;
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using MediaBrowser.Model.Logging;
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using System;
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using System.IO;
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using System.Text;
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namespace MediaBrowser.Common.Implementations.IO
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{
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/// <summary>
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/// Class CommonFileSystem
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/// </summary>
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public class CommonFileSystem : IFileSystem
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{
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protected ILogger Logger;
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private readonly bool _supportsAsyncFileStreams;
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public CommonFileSystem(ILogger logger, bool supportsAsyncFileStreams)
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{
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Logger = logger;
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_supportsAsyncFileStreams = supportsAsyncFileStreams;
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}
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/// <summary>
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/// Determines whether the specified filename is shortcut.
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <returns><c>true</c> if the specified filename is shortcut; otherwise, <c>false</c>.</returns>
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/// <exception cref="System.ArgumentNullException">filename</exception>
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public virtual bool IsShortcut(string filename)
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{
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if (string.IsNullOrEmpty(filename))
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{
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throw new ArgumentNullException("filename");
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}
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var extension = Path.GetExtension(filename);
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return string.Equals(extension, ".mblink", StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// Resolves the shortcut.
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <returns>System.String.</returns>
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/// <exception cref="System.ArgumentNullException">filename</exception>
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public virtual string ResolveShortcut(string filename)
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{
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if (string.IsNullOrEmpty(filename))
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{
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throw new ArgumentNullException("filename");
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}
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if (string.Equals(Path.GetExtension(filename), ".mblink", StringComparison.OrdinalIgnoreCase))
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{
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return File.ReadAllText(filename);
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}
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return null;
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}
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/// <summary>
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/// Creates the shortcut.
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/// </summary>
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/// <param name="shortcutPath">The shortcut path.</param>
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/// <param name="target">The target.</param>
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/// <exception cref="System.ArgumentNullException">
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/// shortcutPath
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/// or
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/// target
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/// </exception>
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public void CreateShortcut(string shortcutPath, string target)
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{
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if (string.IsNullOrEmpty(shortcutPath))
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{
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throw new ArgumentNullException("shortcutPath");
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}
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if (string.IsNullOrEmpty(target))
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{
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throw new ArgumentNullException("target");
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}
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File.WriteAllText(shortcutPath, target);
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}
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/// <summary>
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/// Gets the file system info.
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/// </summary>
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/// <param name="path">The path.</param>
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/// <returns>FileSystemInfo.</returns>
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public FileSystemInfo GetFileSystemInfo(string path)
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{
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// Take a guess to try and avoid two file system hits, but we'll double-check by calling Exists
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if (Path.HasExtension(path))
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{
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var fileInfo = new FileInfo(path);
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if (fileInfo.Exists)
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{
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return fileInfo;
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}
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return new DirectoryInfo(path);
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}
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else
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{
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var fileInfo = new DirectoryInfo(path);
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if (fileInfo.Exists)
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{
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return fileInfo;
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}
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return new FileInfo(path);
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}
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}
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/// <summary>
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/// The space char
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/// </summary>
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private const char SpaceChar = ' ';
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/// <summary>
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/// The invalid file name chars
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/// </summary>
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private static readonly char[] InvalidFileNameChars = Path.GetInvalidFileNameChars();
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/// <summary>
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/// Takes a filename and removes invalid characters
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <returns>System.String.</returns>
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/// <exception cref="System.ArgumentNullException">filename</exception>
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public string GetValidFilename(string filename)
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{
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if (string.IsNullOrEmpty(filename))
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{
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throw new ArgumentNullException("filename");
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}
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var builder = new StringBuilder(filename);
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foreach (var c in InvalidFileNameChars)
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{
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builder = builder.Replace(c, SpaceChar);
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}
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return builder.ToString();
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}
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/// <summary>
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/// Gets the creation time UTC.
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/// </summary>
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/// <param name="info">The info.</param>
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/// <returns>DateTime.</returns>
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public DateTime GetCreationTimeUtc(FileSystemInfo info)
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{
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// This could throw an error on some file systems that have dates out of range
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try
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{
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return info.CreationTimeUtc;
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error determining CreationTimeUtc for {0}", ex, info.FullName);
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return DateTime.MinValue;
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}
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}
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/// <summary>
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/// Gets the creation time UTC.
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/// </summary>
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/// <param name="info">The info.</param>
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/// <param name="logger">The logger.</param>
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/// <returns>DateTime.</returns>
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public DateTime GetLastWriteTimeUtc(FileSystemInfo info)
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{
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// This could throw an error on some file systems that have dates out of range
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try
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{
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return info.LastWriteTimeUtc;
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error determining LastAccessTimeUtc for {0}", ex, info.FullName);
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return DateTime.MinValue;
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}
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}
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/// <summary>
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/// Gets the last write time UTC.
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/// </summary>
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/// <param name="path">The path.</param>
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/// <returns>DateTime.</returns>
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public DateTime GetLastWriteTimeUtc(string path)
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{
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return GetLastWriteTimeUtc(GetFileSystemInfo(path));
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}
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/// <summary>
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/// Gets the file stream.
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/// </summary>
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/// <param name="path">The path.</param>
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/// <param name="mode">The mode.</param>
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/// <param name="access">The access.</param>
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/// <param name="share">The share.</param>
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/// <param name="isAsync">if set to <c>true</c> [is asynchronous].</param>
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/// <returns>FileStream.</returns>
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public FileStream GetFileStream(string path, FileMode mode, FileAccess access, FileShare share, bool isAsync = false)
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{
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if (_supportsAsyncFileStreams && isAsync)
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{
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return new FileStream(path, mode, access, share, 4096, true);
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}
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return new FileStream(path, mode, access, share);
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}
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}
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/// <summary>
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/// Adapted from http://stackoverflow.com/questions/309495/windows-shortcut-lnk-parser-in-java
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/// </summary>
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internal class WindowsShortcut
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{
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public bool IsDirectory { get; private set; }
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public bool IsLocal { get; private set; }
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public string ResolvedPath { get; private set; }
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public WindowsShortcut(string file)
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{
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ParseLink(File.ReadAllBytes(file), Encoding.UTF8);
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}
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private static bool isMagicPresent(byte[] link)
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{
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const int magic = 0x0000004C;
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const int magic_offset = 0x00;
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return link.Length >= 32 && bytesToDword(link, magic_offset) == magic;
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}
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/**
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* Gobbles up link data by parsing it and storing info in member fields
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* @param link all the bytes from the .lnk file
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*/
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private void ParseLink(byte[] link, Encoding encoding)
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{
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if (!isMagicPresent(link))
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throw new IOException("Invalid shortcut; magic is missing", 0);
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// get the flags byte
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byte flags = link[0x14];
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// get the file attributes byte
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const int file_atts_offset = 0x18;
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byte file_atts = link[file_atts_offset];
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byte is_dir_mask = (byte)0x10;
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if ((file_atts & is_dir_mask) > 0)
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{
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IsDirectory = true;
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}
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else
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{
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IsDirectory = false;
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}
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// if the shell settings are present, skip them
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const int shell_offset = 0x4c;
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const byte has_shell_mask = (byte)0x01;
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int shell_len = 0;
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if ((flags & has_shell_mask) > 0)
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{
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// the plus 2 accounts for the length marker itself
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shell_len = bytesToWord(link, shell_offset) + 2;
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}
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// get to the file settings
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int file_start = 0x4c + shell_len;
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const int file_location_info_flag_offset_offset = 0x08;
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int file_location_info_flag = link[file_start + file_location_info_flag_offset_offset];
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IsLocal = (file_location_info_flag & 2) == 0;
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// get the local volume and local system values
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//final int localVolumeTable_offset_offset = 0x0C;
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const int basename_offset_offset = 0x10;
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const int networkVolumeTable_offset_offset = 0x14;
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const int finalname_offset_offset = 0x18;
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int finalname_offset = link[file_start + finalname_offset_offset] + file_start;
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String finalname = getNullDelimitedString(link, finalname_offset, encoding);
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if (IsLocal)
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{
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int basename_offset = link[file_start + basename_offset_offset] + file_start;
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String basename = getNullDelimitedString(link, basename_offset, encoding);
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ResolvedPath = basename + finalname;
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}
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else
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{
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int networkVolumeTable_offset = link[file_start + networkVolumeTable_offset_offset] + file_start;
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int shareName_offset_offset = 0x08;
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int shareName_offset = link[networkVolumeTable_offset + shareName_offset_offset]
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+ networkVolumeTable_offset;
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String shareName = getNullDelimitedString(link, shareName_offset, encoding);
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ResolvedPath = shareName + "\\" + finalname;
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}
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}
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private static string getNullDelimitedString(byte[] bytes, int off, Encoding encoding)
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{
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int len = 0;
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// count bytes until the null character (0)
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while (true)
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{
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if (bytes[off + len] == 0)
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{
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break;
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}
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len++;
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}
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return encoding.GetString(bytes, off, len);
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}
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/*
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* convert two bytes into a short note, this is little endian because it's
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* for an Intel only OS.
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*/
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private static int bytesToWord(byte[] bytes, int off)
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{
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return ((bytes[off + 1] & 0xff) << 8) | (bytes[off] & 0xff);
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}
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private static int bytesToDword(byte[] bytes, int off)
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{
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return (bytesToWord(bytes, off + 2) << 16) | bytesToWord(bytes, off);
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}
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}
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}
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