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115 office 1 <?php
2  
3 /*
4 * This file is part of the Symfony package.
5 *
6 * (c) Fabien Potencier <fabien@symfony.com>
7 *
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
10 */
11  
12 namespace Symfony\Component\Filesystem;
13  
14 use Symfony\Component\Filesystem\Exception\IOException;
15 use Symfony\Component\Filesystem\Exception\FileNotFoundException;
16  
17 /**
18 * Provides basic utility to manipulate the file system.
19 *
20 * @author Fabien Potencier <fabien@symfony.com>
21 */
22 class Filesystem
23 {
24 /**
25 * Copies a file.
26 *
27 * If the target file is older than the origin file, it's always overwritten.
28 * If the target file is newer, it is overwritten only when the
29 * $overwriteNewerFiles option is set to true.
30 *
31 * @param string $originFile The original filename
32 * @param string $targetFile The target filename
33 * @param bool $overwriteNewerFiles If true, target files newer than origin files are overwritten
34 *
35 * @throws FileNotFoundException When originFile doesn't exist
36 * @throws IOException When copy fails
37 */
38 public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
39 {
40 if (stream_is_local($originFile) && !is_file($originFile)) {
41 throw new FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
42 }
43  
44 $this->mkdir(dirname($targetFile));
45  
46 $doCopy = true;
47 if (!$overwriteNewerFiles && null === parse_url($originFile, PHP_URL_HOST) && is_file($targetFile)) {
48 $doCopy = filemtime($originFile) > filemtime($targetFile);
49 }
50  
51 if ($doCopy) {
52 // https://bugs.php.net/bug.php?id=64634
53 if (false === $source = @fopen($originFile, 'r')) {
54 throw new IOException(sprintf('Failed to copy "%s" to "%s" because source file could not be opened for reading.', $originFile, $targetFile), 0, null, $originFile);
55 }
56  
57 // Stream context created to allow files overwrite when using FTP stream wrapper - disabled by default
58 if (false === $target = @fopen($targetFile, 'w', null, stream_context_create(array('ftp' => array('overwrite' => true))))) {
59 throw new IOException(sprintf('Failed to copy "%s" to "%s" because target file could not be opened for writing.', $originFile, $targetFile), 0, null, $originFile);
60 }
61  
62 $bytesCopied = stream_copy_to_stream($source, $target);
63 fclose($source);
64 fclose($target);
65 unset($source, $target);
66  
67 if (!is_file($targetFile)) {
68 throw new IOException(sprintf('Failed to copy "%s" to "%s".', $originFile, $targetFile), 0, null, $originFile);
69 }
70  
71 // Like `cp`, preserve executable permission bits
72 @chmod($targetFile, fileperms($targetFile) | (fileperms($originFile) & 0111));
73  
74 if (stream_is_local($originFile) && $bytesCopied !== ($bytesOrigin = filesize($originFile))) {
75 throw new IOException(sprintf('Failed to copy the whole content of "%s" to "%s" (%g of %g bytes copied).', $originFile, $targetFile, $bytesCopied, $bytesOrigin), 0, null, $originFile);
76 }
77 }
78 }
79  
80 /**
81 * Creates a directory recursively.
82 *
83 * @param string|array|\Traversable $dirs The directory path
84 * @param int $mode The directory mode
85 *
86 * @throws IOException On any directory creation failure
87 */
88 public function mkdir($dirs, $mode = 0777)
89 {
90 foreach ($this->toIterator($dirs) as $dir) {
91 if (is_dir($dir)) {
92 continue;
93 }
94  
95 if (true !== @mkdir($dir, $mode, true)) {
96 $error = error_get_last();
97 if (!is_dir($dir)) {
98 // The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
99 if ($error) {
100 throw new IOException(sprintf('Failed to create "%s": %s.', $dir, $error['message']), 0, null, $dir);
101 }
102 throw new IOException(sprintf('Failed to create "%s"', $dir), 0, null, $dir);
103 }
104 }
105 }
106 }
107  
108 /**
109 * Checks the existence of files or directories.
110 *
111 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to check
112 *
113 * @return bool true if the file exists, false otherwise
114 */
115 public function exists($files)
116 {
117 foreach ($this->toIterator($files) as $file) {
118 if ('\\' === DIRECTORY_SEPARATOR && strlen($file) > 258) {
119 throw new IOException('Could not check if file exist because path length exceeds 258 characters.', 0, null, $file);
120 }
121  
122 if (!file_exists($file)) {
123 return false;
124 }
125 }
126  
127 return true;
128 }
129  
130 /**
131 * Sets access and modification time of file.
132 *
133 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to create
134 * @param int $time The touch time as a Unix timestamp
135 * @param int $atime The access time as a Unix timestamp
136 *
137 * @throws IOException When touch fails
138 */
139 public function touch($files, $time = null, $atime = null)
140 {
141 foreach ($this->toIterator($files) as $file) {
142 $touch = $time ? @touch($file, $time, $atime) : @touch($file);
143 if (true !== $touch) {
144 throw new IOException(sprintf('Failed to touch "%s".', $file), 0, null, $file);
145 }
146 }
147 }
148  
149 /**
150 * Removes files or directories.
151 *
152 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to remove
153 *
154 * @throws IOException When removal fails
155 */
156 public function remove($files)
157 {
158 if ($files instanceof \Traversable) {
159 $files = iterator_to_array($files, false);
160 } elseif (!is_array($files)) {
161 $files = array($files);
162 }
163 $files = array_reverse($files);
164 foreach ($files as $file) {
165 if (is_link($file)) {
166 // See https://bugs.php.net/52176
167 if (!@(unlink($file) || '\\' !== DIRECTORY_SEPARATOR || rmdir($file)) && file_exists($file)) {
168 $error = error_get_last();
169 throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, $error['message']));
170 }
171 } elseif (is_dir($file)) {
172 $this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));
173  
174 if (!@rmdir($file) && file_exists($file)) {
175 $error = error_get_last();
176 throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, $error['message']));
177 }
178 } elseif (!@unlink($file) && file_exists($file)) {
179 $error = error_get_last();
180 throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, $error['message']));
181 }
182 }
183 }
184  
185 /**
186 * Change mode for an array of files or directories.
187 *
188 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change mode
189 * @param int $mode The new mode (octal)
190 * @param int $umask The mode mask (octal)
191 * @param bool $recursive Whether change the mod recursively or not
192 *
193 * @throws IOException When the change fail
194 */
195 public function chmod($files, $mode, $umask = 0000, $recursive = false)
196 {
197 foreach ($this->toIterator($files) as $file) {
198 if (true !== @chmod($file, $mode & ~$umask)) {
199 throw new IOException(sprintf('Failed to chmod file "%s".', $file), 0, null, $file);
200 }
201 if ($recursive && is_dir($file) && !is_link($file)) {
202 $this->chmod(new \FilesystemIterator($file), $mode, $umask, true);
203 }
204 }
205 }
206  
207 /**
208 * Change the owner of an array of files or directories.
209 *
210 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change owner
211 * @param string $user The new owner user name
212 * @param bool $recursive Whether change the owner recursively or not
213 *
214 * @throws IOException When the change fail
215 */
216 public function chown($files, $user, $recursive = false)
217 {
218 foreach ($this->toIterator($files) as $file) {
219 if ($recursive && is_dir($file) && !is_link($file)) {
220 $this->chown(new \FilesystemIterator($file), $user, true);
221 }
222 if (is_link($file) && function_exists('lchown')) {
223 if (true !== @lchown($file, $user)) {
224 throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
225 }
226 } else {
227 if (true !== @chown($file, $user)) {
228 throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
229 }
230 }
231 }
232 }
233  
234 /**
235 * Change the group of an array of files or directories.
236 *
237 * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to change group
238 * @param string $group The group name
239 * @param bool $recursive Whether change the group recursively or not
240 *
241 * @throws IOException When the change fail
242 */
243 public function chgrp($files, $group, $recursive = false)
244 {
245 foreach ($this->toIterator($files) as $file) {
246 if ($recursive && is_dir($file) && !is_link($file)) {
247 $this->chgrp(new \FilesystemIterator($file), $group, true);
248 }
249 if (is_link($file) && function_exists('lchgrp')) {
250 if (true !== @lchgrp($file, $group) || (defined('HHVM_VERSION') && !posix_getgrnam($group))) {
251 throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
252 }
253 } else {
254 if (true !== @chgrp($file, $group)) {
255 throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
256 }
257 }
258 }
259 }
260  
261 /**
262 * Renames a file or a directory.
263 *
264 * @param string $origin The origin filename or directory
265 * @param string $target The new filename or directory
266 * @param bool $overwrite Whether to overwrite the target if it already exists
267 *
268 * @throws IOException When target file or directory already exists
269 * @throws IOException When origin cannot be renamed
270 */
271 public function rename($origin, $target, $overwrite = false)
272 {
273 // we check that target does not exist
274 if (!$overwrite && $this->isReadable($target)) {
275 throw new IOException(sprintf('Cannot rename because the target "%s" already exists.', $target), 0, null, $target);
276 }
277  
278 if (true !== @rename($origin, $target)) {
117 office 279 if (is_dir($origin)) {
280 // See https://bugs.php.net/bug.php?id=54097 & http://php.net/manual/en/function.rename.php#113943
281 $this->mirror($origin, $target, null, array('override' => $overwrite, 'delete' => $overwrite));
282 $this->remove($origin);
283  
284 return;
285 }
115 office 286 throw new IOException(sprintf('Cannot rename "%s" to "%s".', $origin, $target), 0, null, $target);
287 }
288 }
289  
290 /**
291 * Tells whether a file exists and is readable.
292 *
293 * @param string $filename Path to the file
294 *
295 * @return bool
296 *
297 * @throws IOException When windows path is longer than 258 characters
298 */
299 private function isReadable($filename)
300 {
301 if ('\\' === DIRECTORY_SEPARATOR && strlen($filename) > 258) {
302 throw new IOException('Could not check if file is readable because path length exceeds 258 characters.', 0, null, $filename);
303 }
304  
305 return is_readable($filename);
306 }
307  
308 /**
309 * Creates a symbolic link or copy a directory.
310 *
311 * @param string $originDir The origin directory path
312 * @param string $targetDir The symbolic link name
313 * @param bool $copyOnWindows Whether to copy files if on Windows
314 *
315 * @throws IOException When symlink fails
316 */
317 public function symlink($originDir, $targetDir, $copyOnWindows = false)
318 {
319 if ('\\' === DIRECTORY_SEPARATOR) {
320 $originDir = strtr($originDir, '/', '\\');
321 $targetDir = strtr($targetDir, '/', '\\');
322  
323 if ($copyOnWindows) {
324 $this->mirror($originDir, $targetDir);
325  
326 return;
327 }
328 }
329  
330 $this->mkdir(dirname($targetDir));
331  
332 $ok = false;
333 if (is_link($targetDir)) {
334 if (readlink($targetDir) != $originDir) {
335 $this->remove($targetDir);
336 } else {
337 $ok = true;
338 }
339 }
340  
341 if (!$ok && true !== @symlink($originDir, $targetDir)) {
342 $this->linkException($originDir, $targetDir, 'symbolic');
343 }
344 }
345  
346 /**
347 * Creates a hard link, or several hard links to a file.
348 *
349 * @param string $originFile The original file
350 * @param string|string[] $targetFiles The target file(s)
351 *
352 * @throws FileNotFoundException When original file is missing or not a file
353 * @throws IOException When link fails, including if link already exists
354 */
355 public function hardlink($originFile, $targetFiles)
356 {
357 if (!$this->exists($originFile)) {
358 throw new FileNotFoundException(null, 0, null, $originFile);
359 }
360  
361 if (!is_file($originFile)) {
362 throw new FileNotFoundException(sprintf('Origin file "%s" is not a file', $originFile));
363 }
364  
365 foreach ($this->toIterator($targetFiles) as $targetFile) {
366 if (is_file($targetFile)) {
367 if (fileinode($originFile) === fileinode($targetFile)) {
368 continue;
369 }
370 $this->remove($targetFile);
371 }
372  
373 if (true !== @link($originFile, $targetFile)) {
374 $this->linkException($originFile, $targetFile, 'hard');
375 }
376 }
377 }
378  
379 /**
380 * @param string $origin
381 * @param string $target
382 * @param string $linkType Name of the link type, typically 'symbolic' or 'hard'
383 */
384 private function linkException($origin, $target, $linkType)
385 {
386 $report = error_get_last();
387 if (is_array($report)) {
388 if ('\\' === DIRECTORY_SEPARATOR && false !== strpos($report['message'], 'error code(1314)')) {
389 throw new IOException(sprintf('Unable to create %s link due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', $linkType), 0, null, $target);
390 }
391 }
392 throw new IOException(sprintf('Failed to create %s link from "%s" to "%s".', $linkType, $origin, $target), 0, null, $target);
393 }
394  
395 /**
396 * Resolves links in paths.
397 *
398 * With $canonicalize = false (default)
399 * - if $path does not exist or is not a link, returns null
400 * - if $path is a link, returns the next direct target of the link without considering the existence of the target
401 *
402 * With $canonicalize = true
403 * - if $path does not exist, returns null
404 * - if $path exists, returns its absolute fully resolved final version
405 *
406 * @param string $path A filesystem path
407 * @param bool $canonicalize Whether or not to return a canonicalized path
408 *
409 * @return string|null
410 */
411 public function readlink($path, $canonicalize = false)
412 {
413 if (!$canonicalize && !is_link($path)) {
414 return;
415 }
416  
417 if ($canonicalize) {
418 if (!$this->exists($path)) {
419 return;
420 }
421  
422 if ('\\' === DIRECTORY_SEPARATOR) {
423 $path = readlink($path);
424 }
425  
426 return realpath($path);
427 }
428  
429 if ('\\' === DIRECTORY_SEPARATOR) {
430 return realpath($path);
431 }
432  
433 return readlink($path);
434 }
435  
436 /**
437 * Given an existing path, convert it to a path relative to a given starting path.
438 *
439 * @param string $endPath Absolute path of target
440 * @param string $startPath Absolute path where traversal begins
441 *
442 * @return string Path of target relative to starting path
443 */
444 public function makePathRelative($endPath, $startPath)
445 {
446 // Normalize separators on Windows
447 if ('\\' === DIRECTORY_SEPARATOR) {
448 $endPath = str_replace('\\', '/', $endPath);
449 $startPath = str_replace('\\', '/', $startPath);
450 }
451  
452 // Split the paths into arrays
453 $startPathArr = explode('/', trim($startPath, '/'));
454 $endPathArr = explode('/', trim($endPath, '/'));
455  
456 if ('/' !== $startPath[0]) {
457 array_shift($startPathArr);
458 }
459  
460 if ('/' !== $endPath[0]) {
461 array_shift($endPathArr);
462 }
463  
464 $normalizePathArray = function ($pathSegments) {
465 $result = array();
466  
467 foreach ($pathSegments as $segment) {
468 if ('..' === $segment) {
469 array_pop($result);
470 } else {
471 $result[] = $segment;
472 }
473 }
474  
475 return $result;
476 };
477  
478 $startPathArr = $normalizePathArray($startPathArr);
479 $endPathArr = $normalizePathArray($endPathArr);
480  
481 // Find for which directory the common path stops
482 $index = 0;
483 while (isset($startPathArr[$index]) && isset($endPathArr[$index]) && $startPathArr[$index] === $endPathArr[$index]) {
484 ++$index;
485 }
486  
487 // Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
488 if (count($startPathArr) === 1 && $startPathArr[0] === '') {
489 $depth = 0;
490 } else {
491 $depth = count($startPathArr) - $index;
492 }
493  
494 // When we need to traverse from the start, and we are starting from a root path, don't add '../'
495 if ('/' === $startPath[0] && 0 === $index && 0 === $depth) {
496 $traverser = '';
497 } else {
498 // Repeated "../" for each level need to reach the common path
499 $traverser = str_repeat('../', $depth);
500 }
501  
502 $endPathRemainder = implode('/', array_slice($endPathArr, $index));
503  
504 // Construct $endPath from traversing to the common path, then to the remaining $endPath
505 $relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');
506  
507 return '' === $relativePath ? './' : $relativePath;
508 }
509  
510 /**
511 * Mirrors a directory to another.
512 *
513 * @param string $originDir The origin directory
514 * @param string $targetDir The target directory
515 * @param \Traversable $iterator A Traversable instance
516 * @param array $options An array of boolean options
517 * Valid options are:
518 * - $options['override'] Whether to override an existing file on copy or not (see copy())
519 * - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink())
520 * - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
521 *
522 * @throws IOException When file type is unknown
523 */
524 public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = array())
525 {
526 $targetDir = rtrim($targetDir, '/\\');
527 $originDir = rtrim($originDir, '/\\');
528  
529 // Iterate in destination folder to remove obsolete entries
530 if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
531 $deleteIterator = $iterator;
532 if (null === $deleteIterator) {
533 $flags = \FilesystemIterator::SKIP_DOTS;
534 $deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
535 }
536 foreach ($deleteIterator as $file) {
537 $origin = str_replace($targetDir, $originDir, $file->getPathname());
538 if (!$this->exists($origin)) {
539 $this->remove($file);
540 }
541 }
542 }
543  
544 $copyOnWindows = false;
545 if (isset($options['copy_on_windows'])) {
546 $copyOnWindows = $options['copy_on_windows'];
547 }
548  
549 if (null === $iterator) {
550 $flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
551 $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
552 }
553  
554 if ($this->exists($originDir)) {
555 $this->mkdir($targetDir);
556 }
557  
558 foreach ($iterator as $file) {
559 $target = str_replace($originDir, $targetDir, $file->getPathname());
560  
561 if ($copyOnWindows) {
562 if (is_file($file)) {
563 $this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
564 } elseif (is_dir($file)) {
565 $this->mkdir($target);
566 } else {
567 throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
568 }
569 } else {
570 if (is_link($file)) {
571 $this->symlink($file->getLinkTarget(), $target);
572 } elseif (is_dir($file)) {
573 $this->mkdir($target);
574 } elseif (is_file($file)) {
575 $this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
576 } else {
577 throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
578 }
579 }
580 }
581 }
582  
583 /**
584 * Returns whether the file path is an absolute path.
585 *
586 * @param string $file A file path
587 *
588 * @return bool
589 */
590 public function isAbsolutePath($file)
591 {
592 return strspn($file, '/\\', 0, 1)
593 || (strlen($file) > 3 && ctype_alpha($file[0])
594 && substr($file, 1, 1) === ':'
595 && strspn($file, '/\\', 2, 1)
596 )
597 || null !== parse_url($file, PHP_URL_SCHEME)
598 ;
599 }
600  
601 /**
602 * Creates a temporary file with support for custom stream wrappers.
603 *
604 * @param string $dir The directory where the temporary filename will be created
605 * @param string $prefix The prefix of the generated temporary filename
606 * Note: Windows uses only the first three characters of prefix
607 *
608 * @return string The new temporary filename (with path), or throw an exception on failure
609 */
610 public function tempnam($dir, $prefix)
611 {
612 list($scheme, $hierarchy) = $this->getSchemeAndHierarchy($dir);
613  
614 // If no scheme or scheme is "file" or "gs" (Google Cloud) create temp file in local filesystem
615 if (null === $scheme || 'file' === $scheme || 'gs' === $scheme) {
616 $tmpFile = @tempnam($hierarchy, $prefix);
617  
618 // If tempnam failed or no scheme return the filename otherwise prepend the scheme
619 if (false !== $tmpFile) {
620 if (null !== $scheme && 'gs' !== $scheme) {
621 return $scheme.'://'.$tmpFile;
622 }
623  
624 return $tmpFile;
625 }
626  
627 throw new IOException('A temporary file could not be created.');
628 }
629  
630 // Loop until we create a valid temp file or have reached 10 attempts
631 for ($i = 0; $i < 10; ++$i) {
632 // Create a unique filename
633 $tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);
634  
635 // Use fopen instead of file_exists as some streams do not support stat
636 // Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
637 $handle = @fopen($tmpFile, 'x+');
638  
639 // If unsuccessful restart the loop
640 if (false === $handle) {
641 continue;
642 }
643  
644 // Close the file if it was successfully opened
645 @fclose($handle);
646  
647 return $tmpFile;
648 }
649  
650 throw new IOException('A temporary file could not be created.');
651 }
652  
653 /**
654 * Atomically dumps content into a file.
655 *
656 * @param string $filename The file to be written to
657 * @param string $content The data to write into the file
658 *
659 * @throws IOException If the file cannot be written to
660 */
661 public function dumpFile($filename, $content)
662 {
663 $dir = dirname($filename);
664  
665 if (!is_dir($dir)) {
666 $this->mkdir($dir);
667 }
668  
669 if (!is_writable($dir)) {
670 throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
671 }
672  
673 // Will create a temp file with 0600 access rights
674 // when the filesystem supports chmod.
675 $tmpFile = $this->tempnam($dir, basename($filename));
676  
677 if (false === @file_put_contents($tmpFile, $content)) {
678 throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
679 }
680  
681 @chmod($tmpFile, file_exists($filename) ? fileperms($filename) : 0666 & ~umask());
682  
683 $this->rename($tmpFile, $filename, true);
684 }
685  
686 /**
687 * Appends content to an existing file.
688 *
689 * @param string $filename The file to which to append content
690 * @param string $content The content to append
691 *
692 * @throws IOException If the file is not writable
693 */
694 public function appendToFile($filename, $content)
695 {
696 $dir = dirname($filename);
697  
698 if (!is_dir($dir)) {
699 $this->mkdir($dir);
700 }
701  
702 if (!is_writable($dir)) {
703 throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
704 }
705  
706 if (false === @file_put_contents($filename, $content, FILE_APPEND)) {
707 throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
708 }
709 }
710  
711 /**
712 * @param mixed $files
713 *
714 * @return \Traversable
715 */
716 private function toIterator($files)
717 {
718 if (!$files instanceof \Traversable) {
719 $files = new \ArrayObject(is_array($files) ? $files : array($files));
720 }
721  
722 return $files;
723 }
724  
725 /**
726 * Gets a 2-tuple of scheme (may be null) and hierarchical part of a filename (e.g. file:///tmp -> array(file, tmp)).
727 *
728 * @param string $filename The filename to be parsed
729 *
730 * @return array The filename scheme and hierarchical part
731 */
732 private function getSchemeAndHierarchy($filename)
733 {
734 $components = explode('://', $filename, 2);
735  
736 return 2 === count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
737 }
738 }