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jellyfin/MediaBrowser.Common.Impleme.../IO/CommonFileSystem.cs

385 lines
13 KiB

using MediaBrowser.Common.IO;
using MediaBrowser.Model.Logging;
using System;
using System.IO;
using System.Text;
namespace MediaBrowser.Common.Implementations.IO
{
/// <summary>
/// Class CommonFileSystem
/// </summary>
public class CommonFileSystem : IFileSystem
{
protected ILogger Logger;
private readonly bool _supportsAsyncFileStreams;
public CommonFileSystem(ILogger logger, bool supportsAsyncFileStreams)
{
Logger = logger;
_supportsAsyncFileStreams = supportsAsyncFileStreams;
}
/// <summary>
/// Determines whether the specified filename is shortcut.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns><c>true</c> if the specified filename is shortcut; otherwise, <c>false</c>.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public virtual bool IsShortcut(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
var extension = Path.GetExtension(filename);
return string.Equals(extension, ".mblink", StringComparison.OrdinalIgnoreCase);
}
/// <summary>
/// Resolves the shortcut.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public virtual string ResolveShortcut(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
if (string.Equals(Path.GetExtension(filename), ".mblink", StringComparison.OrdinalIgnoreCase))
{
return File.ReadAllText(filename);
}
return null;
}
/// <summary>
/// Creates the shortcut.
/// </summary>
/// <param name="shortcutPath">The shortcut path.</param>
/// <param name="target">The target.</param>
/// <exception cref="System.ArgumentNullException">
/// shortcutPath
/// or
/// target
/// </exception>
public void CreateShortcut(string shortcutPath, string target)
{
if (string.IsNullOrEmpty(shortcutPath))
{
throw new ArgumentNullException("shortcutPath");
}
if (string.IsNullOrEmpty(target))
{
throw new ArgumentNullException("target");
}
File.WriteAllText(shortcutPath, target);
}
/// <summary>
/// Gets the file system info.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>FileSystemInfo.</returns>
public FileSystemInfo GetFileSystemInfo(string path)
{
// Take a guess to try and avoid two file system hits, but we'll double-check by calling Exists
if (Path.HasExtension(path))
{
var fileInfo = new FileInfo(path);
if (fileInfo.Exists)
{
return fileInfo;
}
return new DirectoryInfo(path);
}
else
{
var fileInfo = new DirectoryInfo(path);
if (fileInfo.Exists)
{
return fileInfo;
}
return new FileInfo(path);
}
}
/// <summary>
/// The space char
/// </summary>
private const char SpaceChar = ' ';
/// <summary>
/// The invalid file name chars
/// </summary>
private static readonly char[] InvalidFileNameChars = Path.GetInvalidFileNameChars();
/// <summary>
/// Takes a filename and removes invalid characters
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public string GetValidFilename(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
var builder = new StringBuilder(filename);
foreach (var c in InvalidFileNameChars)
{
builder = builder.Replace(c, SpaceChar);
}
return builder.ToString();
}
/// <summary>
/// Gets the creation time UTC.
/// </summary>
/// <param name="info">The info.</param>
/// <returns>DateTime.</returns>
public DateTime GetCreationTimeUtc(FileSystemInfo info)
{
// This could throw an error on some file systems that have dates out of range
try
{
return info.CreationTimeUtc;
}
catch (Exception ex)
{
Logger.ErrorException("Error determining CreationTimeUtc for {0}", ex, info.FullName);
return DateTime.MinValue;
}
}
/// <summary>
/// Gets the creation time UTC.
/// </summary>
/// <param name="info">The info.</param>
/// <param name="logger">The logger.</param>
/// <returns>DateTime.</returns>
public DateTime GetLastWriteTimeUtc(FileSystemInfo info)
{
// This could throw an error on some file systems that have dates out of range
try
{
return info.LastWriteTimeUtc;
}
catch (Exception ex)
{
Logger.ErrorException("Error determining LastAccessTimeUtc for {0}", ex, info.FullName);
return DateTime.MinValue;
}
}
/// <summary>
/// Gets the last write time UTC.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>DateTime.</returns>
public DateTime GetLastWriteTimeUtc(string path)
{
return GetLastWriteTimeUtc(GetFileSystemInfo(path));
}
/// <summary>
/// Gets the file stream.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="mode">The mode.</param>
/// <param name="access">The access.</param>
/// <param name="share">The share.</param>
/// <param name="isAsync">if set to <c>true</c> [is asynchronous].</param>
/// <returns>FileStream.</returns>
public FileStream GetFileStream(string path, FileMode mode, FileAccess access, FileShare share, bool isAsync = false)
{
if (_supportsAsyncFileStreams && isAsync)
{
return new FileStream(path, mode, access, share, 4096, true);
}
return new FileStream(path, mode, access, share);
}
/// <summary>
/// Swaps the files.
/// </summary>
/// <param name="file1">The file1.</param>
/// <param name="file2">The file2.</param>
public void SwapFiles(string file1, string file2)
{
var temp1 = Path.GetTempFileName();
var temp2 = Path.GetTempFileName();
// Copying over will fail against hidden files
RemoveHiddenAttribute(file1);
RemoveHiddenAttribute(file2);
File.Copy(file1, temp1, true);
File.Copy(file2, temp2, true);
File.Copy(temp1, file2, true);
File.Copy(temp2, file1, true);
File.Delete(temp1);
File.Delete(temp2);
}
/// <summary>
/// Removes the hidden attribute.
/// </summary>
/// <param name="path">The path.</param>
private void RemoveHiddenAttribute(string path)
{
var currentFile = new FileInfo(path);
// This will fail if the file is hidden
if (currentFile.Exists)
{
if ((currentFile.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
{
currentFile.Attributes &= ~FileAttributes.Hidden;
}
}
}
}
/// <summary>
/// Adapted from http://stackoverflow.com/questions/309495/windows-shortcut-lnk-parser-in-java
/// </summary>
internal class WindowsShortcut
{
public bool IsDirectory { get; private set; }
public bool IsLocal { get; private set; }
public string ResolvedPath { get; private set; }
public WindowsShortcut(string file)
{
ParseLink(File.ReadAllBytes(file), Encoding.UTF8);
}
private static bool isMagicPresent(byte[] link)
{
const int magic = 0x0000004C;
const int magic_offset = 0x00;
return link.Length >= 32 && bytesToDword(link, magic_offset) == magic;
}
/**
* Gobbles up link data by parsing it and storing info in member fields
* @param link all the bytes from the .lnk file
*/
private void ParseLink(byte[] link, Encoding encoding)
{
if (!isMagicPresent(link))
throw new IOException("Invalid shortcut; magic is missing", 0);
// get the flags byte
byte flags = link[0x14];
// get the file attributes byte
const int file_atts_offset = 0x18;
byte file_atts = link[file_atts_offset];
byte is_dir_mask = (byte)0x10;
if ((file_atts & is_dir_mask) > 0)
{
IsDirectory = true;
}
else
{
IsDirectory = false;
}
// if the shell settings are present, skip them
const int shell_offset = 0x4c;
const byte has_shell_mask = (byte)0x01;
int shell_len = 0;
if ((flags & has_shell_mask) > 0)
{
// the plus 2 accounts for the length marker itself
shell_len = bytesToWord(link, shell_offset) + 2;
}
// get to the file settings
int file_start = 0x4c + shell_len;
const int file_location_info_flag_offset_offset = 0x08;
int file_location_info_flag = link[file_start + file_location_info_flag_offset_offset];
IsLocal = (file_location_info_flag & 2) == 0;
// get the local volume and local system values
//final int localVolumeTable_offset_offset = 0x0C;
const int basename_offset_offset = 0x10;
const int networkVolumeTable_offset_offset = 0x14;
const int finalname_offset_offset = 0x18;
int finalname_offset = link[file_start + finalname_offset_offset] + file_start;
String finalname = getNullDelimitedString(link, finalname_offset, encoding);
if (IsLocal)
{
int basename_offset = link[file_start + basename_offset_offset] + file_start;
String basename = getNullDelimitedString(link, basename_offset, encoding);
ResolvedPath = basename + finalname;
}
else
{
int networkVolumeTable_offset = link[file_start + networkVolumeTable_offset_offset] + file_start;
int shareName_offset_offset = 0x08;
int shareName_offset = link[networkVolumeTable_offset + shareName_offset_offset]
+ networkVolumeTable_offset;
String shareName = getNullDelimitedString(link, shareName_offset, encoding);
ResolvedPath = shareName + "\\" + finalname;
}
}
private static string getNullDelimitedString(byte[] bytes, int off, Encoding encoding)
{
int len = 0;
// count bytes until the null character (0)
while (true)
{
if (bytes[off + len] == 0)
{
break;
}
len++;
}
return encoding.GetString(bytes, off, len);
}
/*
* convert two bytes into a short note, this is little endian because it's
* for an Intel only OS.
*/
private static int bytesToWord(byte[] bytes, int off)
{
return ((bytes[off + 1] & 0xff) << 8) | (bytes[off] & 0xff);
}
private static int bytesToDword(byte[] bytes, int off)
{
return (bytesToWord(bytes, off + 2) << 16) | bytesToWord(bytes, off);
}
}
}