mcs/class/corlib/System.IO/File.cs

   1 //
   2 // System.IO.File.cs
   3 //
   4 //
   5 // Authors:
   6 //   Miguel de Icaza (miguel@ximian.com)
   7 //   Jim Richardson  (develop@wtfo-guru.com)
   8 //   Dan Lewis       (dihlewis@yahoo.co.uk)
   9 //   Ville Palo      (vi64pa@kolumbus.fi)
  10 //
  11 // Copyright 2002 Ximian, Inc. http://www.ximian.com
  12 // Copyright (C) 2001 Moonlight Enterprises, All Rights Reserved
  13 // Copyright (C) 2004, 2006, 2010 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.Collections.Generic;
  37 using System.Diagnostics;
  38 using System.Security;
  39 using System.Text;
  40 using System.Runtime.InteropServices;
  41 using System.Security.AccessControl;
  42
  43 namespace System.IO
  44 {
  45         [ComVisible (true)]
  46         public static class File
  47         {
  48                 public static void AppendAllText (string path, string contents)
  49                 {
  50                         using (TextWriter w = new StreamWriter (path, true)) {
  51                                 w.Write (contents);
  52                         }
  53                 }
  54
  55                 public static void AppendAllText (string path, string contents, Encoding encoding)
  56                 {
  57                         using (TextWriter w = new StreamWriter (path, true, encoding)) {
  58                                 w.Write (contents);
  59                         }
  60                 }
  61
  62                 public static StreamWriter AppendText (string path)
  63                 {
  64                         return new StreamWriter (path, true);
  65                 }
  66
  67                 public static void Copy (string sourceFileName, string destFileName)
  68                 {
  69                         Copy (sourceFileName, destFileName, false);
  70                 }
  71
  72                 public static void Copy (string sourceFileName, string destFileName, bool overwrite)
  73                 {
  74                         MonoIOError error;
  75
  76                         if (sourceFileName == null)
  77                                 throw new ArgumentNullException ("sourceFileName");
  78                         if (destFileName == null)
  79                                 throw new ArgumentNullException ("destFileName");
  80                         if (sourceFileName.Length == 0)
  81                                 throw new ArgumentException ("An empty file name is not valid.", "sourceFileName");
  82                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
  83                                 throw new ArgumentException ("The file name is not valid.");
  84                         if (destFileName.Length == 0)
  85                                 throw new ArgumentException ("An empty file name is not valid.", "destFileName");
  86                         if (destFileName.Trim ().Length == 0 || destFileName.IndexOfAny (Path.InvalidPathChars) != -1)
  87                                 throw new ArgumentException ("The file name is not valid.");
  88
  89                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
  90
  91                         if (!MonoIO.Exists (sourceFileName, out error))
  92                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName), sourceFileName);
  93                         if ((GetAttributes (sourceFileName) & FileAttributes.Directory) == FileAttributes.Directory)
  94                                 throw new ArgumentException (Locale.GetText ("{0} is a directory", sourceFileName));
  95
  96                         if (MonoIO.Exists (destFileName, out error)) {
  97                                 if ((GetAttributes (destFileName) & FileAttributes.Directory) == FileAttributes.Directory)
  98                                         throw new ArgumentException (Locale.GetText ("{0} is a directory", destFileName));
  99                                 if (!overwrite)
 100                                         throw new IOException (Locale.GetText ("{0} already exists", destFileName));
 101                         }
 102
 103                         string DirName = Path.GetDirectoryName (destFileName);
 104                         if (DirName != String.Empty && !Directory.Exists (DirName))
 105                                 throw new DirectoryNotFoundException (Locale.GetText ("Destination directory not found: {0}",DirName));
 106
 107                         if (!MonoIO.CopyFile (sourceFileName, destFileName, overwrite, out error)) {
 108                                 string p = Locale.GetText ("{0}\" or \"{1}", sourceFileName, destFileName);
 109                                 throw MonoIO.GetException (p, error);
 110                         }
 111                 }
 112
 113                 internal static String InternalCopy (String sourceFileName, String destFileName, bool overwrite, bool checkHost)
 114                 {
 115                         String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
 116                         String fullDestFileName = Path.GetFullPathInternal(destFileName);
 117
 118                         MonoIOError error;
 119
 120                         if (!MonoIO.CopyFile (fullSourceFileName, fullDestFileName, overwrite, out error)) {
 121                                 string p = Locale.GetText ("{0}\" or \"{1}", sourceFileName, destFileName);
 122                                 throw MonoIO.GetException (p, error);
 123                         }
 124
 125                         return fullDestFileName;
 126                 }
 127
 128                 public static FileStream Create (string path)
 129                 {
 130                         return Create (path, 8192);
 131                 }
 132
 133                 public static FileStream Create (string path, int bufferSize)
 134                 {
 135                         return new FileStream (path, FileMode.Create, FileAccess.ReadWrite,
 136                                 FileShare.None, bufferSize);
 137                 }
 138
 139                 [MonoLimitation ("FileOptions are ignored")]
 140                 public static FileStream Create (string path, int bufferSize,
 141                                                  FileOptions options)
 142                 {
 143                         return new FileStream (path, FileMode.Create, FileAccess.ReadWrite,
 144                                 FileShare.None, bufferSize, options);
 145                 }
 146
 147                 [MonoLimitation ("FileOptions and FileSecurity are ignored")]
 148                 public static FileStream Create (string path, int bufferSize,
 149                                                  FileOptions options,
 150                                                  FileSecurity fileSecurity)
 151                 {
 152                         return new FileStream (path, FileMode.Create, FileAccess.ReadWrite,
 153                                 FileShare.None, bufferSize, options);
 154                 }
 155
 156                 public static StreamWriter CreateText (string path)
 157                 {
 158                         return new StreamWriter (path, false);
 159                 }
 160
 161                 public static void Delete (string path)
 162                 {
 163                         Path.Validate (path);
 164                         if (Directory.Exists (path))
 165                                 throw new UnauthorizedAccessException(Locale.GetText ("{0} is a directory", path));
 166
 167                         string DirName = Path.GetDirectoryName(path);
 168                         if (DirName != String.Empty && !Directory.Exists (DirName))
 169                                 throw new DirectoryNotFoundException (Locale.GetText ("Could not find a part of the path \"{0}\".", path));
 170
 171                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 172
 173                         MonoIOError error;
 174
 175                         if (!MonoIO.DeleteFile (path, out error)){
 176                                 if (error != MonoIOError.ERROR_FILE_NOT_FOUND)
 177                                         throw MonoIO.GetException (path, error);
 178                         }
 179                 }
 180
 181                 public static bool Exists (string path)
 182                 {
 183                         // For security reasons no exceptions are
 184                         // thrown, only false is returned if there is
 185                         // any problem with the path or permissions.
 186                         // Minimizes what information can be
 187                         // discovered by using this method.
 188                         if (String.IsNullOrWhiteSpace (path) || path.IndexOfAny(Path.InvalidPathChars) >= 0)
 189                                 return false;
 190
 191                         // on Moonlight this does not throw but returns false
 192                         if (!SecurityManager.CheckElevatedPermissions ())
 193                                 return false;
 194
 195                         MonoIOError error;
 196                         return MonoIO.ExistsFile (path, out error);
 197                 }
 198
 199                 public static FileSecurity GetAccessControl (string path)
 200                 {
 201                         // AccessControlSections.Audit requires special permissions.
 202                         return GetAccessControl (path,
 203                                                  AccessControlSections.Owner |
 204                                                  AccessControlSections.Group |
 205                                                  AccessControlSections.Access);
 206                 }
 207
 208                 public static FileSecurity GetAccessControl (string path, AccessControlSections includeSections)
 209                 {
 210                         return new FileSecurity (path, includeSections);
 211                 }
 212
 213                 public static FileAttributes GetAttributes (string path)
 214                 {
 215                         Path.Validate (path);
 216                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 217
 218                         MonoIOError error;
 219                         FileAttributes attrs;
 220
 221                         attrs = MonoIO.GetFileAttributes (path, out error);
 222                         if (error != MonoIOError.ERROR_SUCCESS)
 223                                 throw MonoIO.GetException (path, error);
 224                         return attrs;
 225                 }
 226
 227                 public static DateTime GetCreationTime (string path)
 228                 {
 229                         MonoIOStat stat;
 230                         MonoIOError error;
 231                         Path.Validate (path);
 232                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 233
 234                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 235                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 236                                         return DefaultLocalFileTime;
 237                                 else
 238                                         throw new IOException (path);
 239                         }
 240                         return DateTime.FromFileTime (stat.CreationTime);
 241                 }
 242
 243                 public static DateTime GetCreationTimeUtc (string path)
 244                 {
 245                         return GetCreationTime (path).ToUniversalTime ();
 246                 }
 247
 248                 public static DateTime GetLastAccessTime (string path)
 249                 {
 250                         MonoIOStat stat;
 251                         MonoIOError error;
 252                         Path.Validate (path);
 253                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 254
 255                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 256                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 257                                         return DefaultLocalFileTime;
 258                                 else
 259                                         throw new IOException (path);
 260                         }
 261                         return DateTime.FromFileTime (stat.LastAccessTime);
 262                 }
 263
 264                 public static DateTime GetLastAccessTimeUtc (string path)
 265                 {
 266                         return GetLastAccessTime (path).ToUniversalTime ();
 267                 }
 268
 269                 public static DateTime GetLastWriteTime (string path)
 270                 {
 271                         MonoIOStat stat;
 272                         MonoIOError error;
 273                         Path.Validate (path);
 274                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 275
 276                         if (!MonoIO.GetFileStat (path, out stat, out error)) {
 277                                 if (error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_FILE_NOT_FOUND)
 278                                         return DefaultLocalFileTime;
 279                                 else
 280                                         throw new IOException (path);
 281                         }
 282                         return DateTime.FromFileTime (stat.LastWriteTime);
 283                 }
 284
 285                 public static DateTime GetLastWriteTimeUtc (string path)
 286                 {
 287                         return GetLastWriteTime (path).ToUniversalTime ();
 288                 }
 289
 290                 public static void Move (string sourceFileName, string destFileName)
 291                 {
 292                         if (sourceFileName == null)
 293                                 throw new ArgumentNullException ("sourceFileName");
 294                         if (destFileName == null)
 295                                 throw new ArgumentNullException ("destFileName");
 296                         if (sourceFileName.Length == 0)
 297                                 throw new ArgumentException ("An empty file name is not valid.", "sourceFileName");
 298                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 299                                 throw new ArgumentException ("The file name is not valid.");
 300                         if (destFileName.Length == 0)
 301                                 throw new ArgumentException ("An empty file name is not valid.", "destFileName");
 302                         if (destFileName.Trim ().Length == 0 || destFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 303                                 throw new ArgumentException ("The file name is not valid.");
 304
 305                         SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
 306
 307                         MonoIOError error;
 308                         if (!MonoIO.Exists (sourceFileName, out error))
 309                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName), sourceFileName);
 310
 311                         // Don't check for this error here to allow the runtime
 312                         // to check if sourceFileName and destFileName are equal.
 313                         // Comparing sourceFileName and destFileName is not enough.
 314                         //if (MonoIO.Exists (destFileName, out error))
 315                         //      throw new IOException (Locale.GetText ("{0} already exists", destFileName));
 316
 317                         string DirName;
 318                         DirName = Path.GetDirectoryName (destFileName);
 319                         if (DirName != String.Empty && !Directory.Exists (DirName))
 320                                 throw new DirectoryNotFoundException (Locale.GetText ("Could not find a part of the path."));
 321
 322                         if (!MonoIO.MoveFile (sourceFileName, destFileName, out error)) {
 323                                 if (error == MonoIOError.ERROR_ALREADY_EXISTS)
 324                                         throw MonoIO.GetException (error);
 325                                 else if (error == MonoIOError.ERROR_SHARING_VIOLATION)
 326                                         throw MonoIO.GetException (sourceFileName, error);
 327
 328                                 throw MonoIO.GetException (error);
 329                         }
 330                 }
 331
 332                 public static FileStream Open (string path, FileMode mode)
 333                 {
 334                         return new FileStream (path, mode, mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite, FileShare.None);
 335                 }
 336
 337                 public static FileStream Open (string path, FileMode mode, FileAccess access)
 338                 {
 339                         return new FileStream (path, mode, access, FileShare.None);
 340                 }
 341
 342                 public static FileStream Open (string path, FileMode mode, FileAccess access,
 343                                                FileShare share)
 344                 {
 345                         return new FileStream (path, mode, access, share);
 346                 }
 347
 348                 public static FileStream OpenRead (string path)
 349                 {
 350                         return new FileStream (path, FileMode.Open, FileAccess.Read, FileShare.Read);
 351                 }
 352
 353                 public static StreamReader OpenText (string path)
 354                 {
 355                         return new StreamReader (path);
 356                 }
 357
 358                 public static FileStream OpenWrite (string path)
 359                 {
 360                         return new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None);
 361                 }
 362
 363                 public static void Replace (string sourceFileName,
 364                                             string destinationFileName,
 365                                             string destinationBackupFileName)
 366                 {
 367                         Replace (sourceFileName, destinationFileName, destinationBackupFileName, false);
 368                 }
 369
 370                 public static void Replace (string sourceFileName,
 371                                             string destinationFileName,
 372                                             string destinationBackupFileName,
 373                                             bool ignoreMetadataErrors)
 374                 {
 375                         MonoIOError error;
 376
 377                         if (sourceFileName == null)
 378                                 throw new ArgumentNullException ("sourceFileName");
 379                         if (destinationFileName == null)
 380                                 throw new ArgumentNullException ("destinationFileName");
 381                         if (sourceFileName.Trim ().Length == 0 || sourceFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 382                                 throw new ArgumentException ("sourceFileName");
 383                         if (destinationFileName.Trim ().Length == 0 || destinationFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 384                                 throw new ArgumentException ("destinationFileName");
 385
 386                         string fullSource = Path.GetFullPath (sourceFileName);
 387                         string fullDest = Path.GetFullPath (destinationFileName);
 388                         if (MonoIO.ExistsDirectory (fullSource, out error))
 389                                 throw new IOException (Locale.GetText ("{0} is a directory", sourceFileName));
 390                         if (MonoIO.ExistsDirectory (fullDest, out error))
 391                                 throw new IOException (Locale.GetText ("{0} is a directory", destinationFileName));
 392
 393                         if (!Exists (fullSource))
 394                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", sourceFileName),
 395                                                                  sourceFileName);
 396                         if (!Exists (fullDest))
 397                                 throw new FileNotFoundException (Locale.GetText ("{0} does not exist", destinationFileName),
 398                                                                  destinationFileName);
 399                         if (fullSource == fullDest)
 400                                 throw new IOException (Locale.GetText ("Source and destination arguments are the same file."));
 401
 402                         string fullBackup = null;
 403                         if (destinationBackupFileName != null) {
 404                                 if (destinationBackupFileName.Trim ().Length == 0 ||
 405                                     destinationBackupFileName.IndexOfAny (Path.InvalidPathChars) != -1)
 406                                         throw new ArgumentException ("destinationBackupFileName");
 407
 408                                 fullBackup = Path.GetFullPath (destinationBackupFileName);
 409                                 if (MonoIO.ExistsDirectory (fullBackup, out error))
 410                                         throw new IOException (Locale.GetText ("{0} is a directory", destinationBackupFileName));
 411                                 if (fullSource == fullBackup)
 412                                         throw new IOException (Locale.GetText ("Source and backup arguments are the same file."));
 413                                 if (fullDest == fullBackup)
 414                                         throw new IOException (Locale.GetText (
 415                                                                "Destination and backup arguments are the same file."));
 416                         }
 417
 418                         var attrs = GetAttributes (fullDest);
 419
 420                         // TODO: Should be done in wapi, win32 api handles this already
 421                         if ((attrs & FileAttributes.ReadOnly) != 0)
 422                                 throw MonoIO.GetException (MonoIOError.ERROR_ACCESS_DENIED);
 423
 424                         if (!MonoIO.ReplaceFile (fullSource, fullDest, fullBackup,
 425                                                  ignoreMetadataErrors, out error)) {
 426                                 throw MonoIO.GetException (error);
 427                         }
 428                 }
 429
 430                 public static void SetAccessControl (string path,
 431                                                      FileSecurity fileSecurity)
 432                 {
 433                         if (null == fileSecurity)
 434                                 throw new ArgumentNullException ("fileSecurity");
 435
 436                         fileSecurity.PersistModifications (path);
 437                 }
 438
 439                 public static void SetAttributes (string path,
 440                                                   FileAttributes fileAttributes)
 441                 {
 442                         MonoIOError error;
 443                         Path.Validate (path);
 444
 445                         if (!MonoIO.SetFileAttributes (path, fileAttributes, out error))
 446                                 throw MonoIO.GetException (path, error);
 447                 }
 448
 449                 public static void SetCreationTime (string path, DateTime creationTime)
 450                 {
 451                         MonoIOError error;
 452                         Path.Validate (path);
 453                         if (!MonoIO.Exists (path, out error))
 454                                 throw MonoIO.GetException (path, error);
 455                         if (!MonoIO.SetCreationTime (path, creationTime, out error))
 456                                 throw MonoIO.GetException (path, error);
 457                 }
 458
 459                 public static void SetCreationTimeUtc (string path, DateTime creationTimeUtc)
 460                 {
 461                         SetCreationTime (path, creationTimeUtc.ToLocalTime ());
 462                 }
 463
 464                 public static void SetLastAccessTime (string path, DateTime lastAccessTime)
 465                 {
 466                         MonoIOError error;
 467                         Path.Validate (path);
 468                         if (!MonoIO.Exists (path, out error))
 469                                 throw MonoIO.GetException (path, error);
 470                         if (!MonoIO.SetLastAccessTime (path, lastAccessTime, out error))
 471                                 throw MonoIO.GetException (path, error);
 472                 }
 473
 474                 public static void SetLastAccessTimeUtc (string path, DateTime lastAccessTimeUtc)
 475                 {
 476                         SetLastAccessTime (path, lastAccessTimeUtc.ToLocalTime ());
 477                 }
 478
 479                 public static void SetLastWriteTime (string path,
 480                                                      DateTime lastWriteTime)
 481                 {
 482                         MonoIOError error;
 483                         Path.Validate (path);
 484                         if (!MonoIO.Exists (path, out error))
 485                                 throw MonoIO.GetException (path, error);
 486                         if (!MonoIO.SetLastWriteTime (path, lastWriteTime, out error))
 487                                 throw MonoIO.GetException (path, error);
 488                 }
 489
 490                 public static void SetLastWriteTimeUtc (string path,
 491                                                      DateTime lastWriteTimeUtc)
 492                 {
 493                         SetLastWriteTime (path, lastWriteTimeUtc.ToLocalTime ());
 494                 }
 495
 496                 //
 497                 // The documentation for this method is most likely wrong, it
 498                 // talks about doing a "binary read", but the remarks say
 499                 // that this "detects the encoding".
 500                 //
 501                 // This can not detect and do anything useful with the encoding
 502                 // since the result is a byte [] not a char [].
 503                 //
 504                 public static byte [] ReadAllBytes (string path)
 505                 {
 506                         using (FileStream s = OpenRead (path)) {
 507                                 long size = s.Length;
 508                                 // limited to 2GB according to http://msdn.microsoft.com/en-us/library/system.io.file.readallbytes.aspx
 509                                 if (size > Int32.MaxValue)
 510                                         throw new IOException ("Reading more than 2GB with this call is not supported");
 511
 512                                 int pos = 0;
 513                                 int count = (int) size;
 514                                 byte [] result = new byte [size];
 515                                 while (count > 0) {
 516                                         int n = s.Read (result, pos, count);
 517                                         if (n == 0)
 518                                                 throw new IOException ("Unexpected end of stream");
 519                                         pos += n;
 520                                         count -= n;
 521                                 }
 522                                 return result;
 523                         }
 524                 }
 525
 526                 public static string [] ReadAllLines (string path)
 527                 {
 528                         using (StreamReader reader = File.OpenText (path)) {
 529                                 return ReadAllLines (reader);
 530                         }
 531                 }
 532
 533                 public static string [] ReadAllLines (string path, Encoding encoding)
 534                 {
 535                         using (StreamReader reader = new StreamReader (path, encoding)) {
 536                                 return ReadAllLines (reader);
 537                         }
 538                 }
 539
 540                 static string [] ReadAllLines (StreamReader reader)
 541                 {
 542                         List<string> list = new List<string> ();
 543                         while (!reader.EndOfStream)
 544                                 list.Add (reader.ReadLine ());
 545                         return list.ToArray ();
 546                 }
 547
 548                 public static string ReadAllText (string path)
 549                 {
 550                         using (StreamReader sr = new StreamReader (path)) {
 551                                 return sr.ReadToEnd ();
 552                         }
 553                 }
 554
 555                 public static string ReadAllText (string path, Encoding encoding)
 556                 {
 557                         using (StreamReader sr = new StreamReader (path, encoding)) {
 558                                 return sr.ReadToEnd ();
 559                         }
 560                 }
 561
 562                 public static void WriteAllBytes (string path, byte [] bytes)
 563                 {
 564                         using (Stream stream = File.Create (path)) {
 565                                 stream.Write (bytes, 0, bytes.Length);
 566                         }
 567                 }
 568
 569                 public static void WriteAllLines (string path, string [] contents)
 570                 {
 571                         using (StreamWriter writer = new StreamWriter (path)) {
 572                                 WriteAllLines (writer, contents);
 573                         }
 574                 }
 575
 576                 public static void WriteAllLines (string path, string [] contents, Encoding encoding)
 577                 {
 578                         using (StreamWriter writer = new StreamWriter (path, false, encoding)) {
 579                                 WriteAllLines (writer, contents);
 580                         }
 581                 }
 582
 583                 static void WriteAllLines (StreamWriter writer, string [] contents)
 584                 {
 585                         foreach (string line in contents)
 586                                 writer.WriteLine (line);
 587                 }
 588
 589                 public static void WriteAllText (string path, string contents)
 590                 {
 591                         WriteAllText (path, contents, EncodingHelper.UTF8Unmarked);
 592                 }
 593
 594                 public static void WriteAllText (string path, string contents, Encoding encoding)
 595                 {
 596                         using (StreamWriter sw = new StreamWriter (path, false, encoding)) {
 597                                 sw.Write (contents);
 598                         }
 599                 }
 600
 601                 static DateTime? defaultLocalFileTime;
 602                 static DateTime DefaultLocalFileTime {
 603                         get {
 604                                 if (defaultLocalFileTime == null)
 605                                         defaultLocalFileTime = new DateTime (1601, 1, 1).ToLocalTime ();
 606
 607                                 return defaultLocalFileTime.Value;
 608                         }
 609                 }
 610
 611
 612                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 613                 public static void Encrypt (string path)
 614                 {
 615                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 616                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 617                         // we throw the same (instead of a NotImplementedException) because most code should already be
 618                         // handling this exception to work properly.
 619                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 620                 }
 621
 622                 [MonoLimitation ("File encryption isn't supported (even on NTFS).")]
 623                 public static void Decrypt (string path)
 624                 {
 625                         // MS.NET support this only on NTFS file systems, i.e. it's a file-system (not a framework) feature.
 626                         // otherwise it throws a NotSupportedException (or a PlatformNotSupportedException on older OS).
 627                         // we throw the same (instead of a NotImplementedException) because most code should already be
 628                         // handling this exception to work properly.
 629                         throw new NotSupportedException (Locale.GetText ("File encryption isn't supported on any file system."));
 630                 }
 631
 632                 public static IEnumerable<string> ReadLines (string path)
 633                 {
 634                         return ReadLines (File.OpenText (path));
 635                 }
 636
 637                 public static IEnumerable<string> ReadLines (string path, Encoding encoding)
 638                 {
 639                         return ReadLines (new StreamReader (path, encoding));
 640                 }
 641
 642                 // refactored in order to avoid compiler-generated names for Moonlight tools
 643                 static IEnumerable<string> ReadLines (StreamReader reader)
 644                 {
 645                         using (reader) {
 646                                 string s;
 647                                 while ((s = reader.ReadLine ()) != null) {
 648                                         yield return s;
 649                                 }
 650                         }
 651                 }
 652
 653                 public static void AppendAllLines (string path, IEnumerable<string> contents)
 654                 {
 655                         Path.Validate (path);
 656
 657                         if (contents == null)
 658                                 return;
 659
 660                         using (TextWriter w = new StreamWriter (path, true)) {
 661                                 foreach (var line in contents)
 662                                         w.WriteLine (line);
 663                         }
 664                 }
 665
 666                 public static void AppendAllLines (string path, IEnumerable<string> contents, Encoding encoding)
 667                 {
 668                         Path.Validate (path);
 669
 670                         if (contents == null)
 671                                 return;
 672
 673                         using (TextWriter w = new StreamWriter (path, true, encoding)) {
 674                                 foreach (var line in contents)
 675                                         w.WriteLine (line);
 676                         }
 677                 }
 678
 679                 public static void WriteAllLines (string path, IEnumerable<string> contents)
 680                 {
 681                         Path.Validate (path);
 682
 683                         if (contents == null)
 684                                 return;
 685
 686                         using (TextWriter w = new StreamWriter (path, false)) {
 687                                 foreach (var line in contents)
 688                                         w.WriteLine (line);
 689                         }
 690                 }
 691
 692                 public static void WriteAllLines (string path, IEnumerable<string> contents, Encoding encoding)
 693                 {
 694                         Path.Validate (path);
 695
 696                         if (contents == null)
 697                                 return;
 698
 699                         using (TextWriter w = new StreamWriter (path, false, encoding)) {
 700                                 foreach (var line in contents)
 701                                         w.WriteLine (line);
 702                         }
 703                 }
 704
 705                 internal static int FillAttributeInfo (String path, ref MonoIOStat data, bool tryagain, bool returnErrorOnNotFound)
 706                 {
 707                         if (tryagain)
 708                                 throw new NotImplementedException ();
 709
 710                         MonoIOError error;
 711                         MonoIO.GetFileStat (path, out data, out error);
 712
 713                         if (!returnErrorOnNotFound && (error == MonoIOError.ERROR_FILE_NOT_FOUND || error == MonoIOError.ERROR_PATH_NOT_FOUND || error == MonoIOError.ERROR_NOT_READY)) {
 714                                 data = default (MonoIOStat);
 715                                 data.fileAttributes = (FileAttributes) (-1);
 716                                 return 0;
 717                         }
 718
 719                         return (int) error;
 720                 }
 721 #region Copied from corefx
 722
 723                 internal static DateTimeOffset GetUtcDateTimeOffset(DateTime dateTime)
 724                 {
 725                         // File and Directory UTC APIs treat a DateTimeKind.Unspecified as UTC whereas
 726                         // ToUniversalTime treats this as local.
 727                         if (dateTime.Kind == DateTimeKind.Unspecified)
 728                         {
 729                                 return DateTime.SpecifyKind(dateTime, DateTimeKind.Utc);
 730                         }
 731
 732                         return dateTime.ToUniversalTime();
 733                 }
 734 #endregion
 735
 736         }
 737 }