diff --git a/core/lib/Drupal/Core/StreamWrapper/LocalStream.php b/core/lib/Drupal/Core/StreamWrapper/LocalStream.php
new file mode 100644
index 0000000000000000000000000000000000000000..9f2b95ded36d83455237ca256c988c56956ff8de
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/LocalStream.php
@@ -0,0 +1,546 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\LocalStream.
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Defines a Drupal stream wrapper base class for local files.
+ *
+ * This class provides a complete stream wrapper implementation. URIs such as
+ * "public://example.txt" are expanded to a normal filesystem path such as
+ * "sites/default/files/example.txt" and then PHP filesystem functions are
+ * invoked.
+ *
+ * Drupal\Core\StreamWrapper\LocalStream implementations need to implement at least the
+ * getDirectoryPath() and getExternalUrl() methods.
+ */
+abstract class LocalStream implements StreamWrapperInterface {
+ /**
+ * Stream context resource.
+ *
+ * @var resource
+ */
+ public $context;
+
+ /**
+ * A generic resource handle.
+ *
+ * @var resource
+ */
+ public $handle = NULL;
+
+ /**
+ * Instance URI (stream).
+ *
+ * A stream is referenced as "scheme://target".
+ *
+ * @var string
+ */
+ protected $uri;
+
+ /**
+ * Gets the path that the wrapper is responsible for.
+ * @TODO: Review this method name in D8 per http://drupal.org/node/701358
+ *
+ * @return string
+ * String specifying the path.
+ */
+ abstract function getDirectoryPath();
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::setUri().
+ */
+ function setUri($uri) {
+ $this->uri = $uri;
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getUri().
+ */
+ function getUri() {
+ return $this->uri;
+ }
+
+ /**
+ * Returns the local writable target of the resource within the stream.
+ *
+ * This function should be used in place of calls to realpath() or similar
+ * functions when attempting to determine the location of a file. While
+ * functions like realpath() may return the location of a read-only file, this
+ * method may return a URI or path suitable for writing that is completely
+ * separate from the URI used for reading.
+ *
+ * @param string $uri
+ * Optional URI.
+ *
+ * @return string|bool
+ * Returns a string representing a location suitable for writing of a file,
+ * or FALSE if unable to write to the file such as with read-only streams.
+ */
+ protected function getTarget($uri = NULL) {
+ if (!isset($uri)) {
+ $uri = $this->uri;
+ }
+
+ list($scheme, $target) = explode('://', $uri, 2);
+
+ // Remove erroneous leading or trailing, forward-slashes and backslashes.
+ return trim($target, '\/');
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getMimeType().
+ */
+ static function getMimeType($uri, $mapping = NULL) {
+ if (!isset($mapping)) {
+ // The default file map, defined in file.mimetypes.inc is quite big.
+ // We only load it when necessary.
+ include_once DRUPAL_ROOT . '/core/includes/file.mimetypes.inc';
+ $mapping = file_mimetype_mapping();
+ }
+
+ $extension = '';
+ $file_parts = explode('.', drupal_basename($uri));
+
+ // Remove the first part: a full filename should not match an extension.
+ array_shift($file_parts);
+
+ // Iterate over the file parts, trying to find a match.
+ // For my.awesome.image.jpeg, we try:
+ // - jpeg
+ // - image.jpeg, and
+ // - awesome.image.jpeg
+ while ($additional_part = array_pop($file_parts)) {
+ $extension = strtolower($additional_part . ($extension ? '.' . $extension : ''));
+ if (isset($mapping['extensions'][$extension])) {
+ return $mapping['mimetypes'][$mapping['extensions'][$extension]];
+ }
+ }
+
+ return 'application/octet-stream';
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::chmod().
+ */
+ function chmod($mode) {
+ $output = @chmod($this->getLocalPath(), $mode);
+ // We are modifying the underlying file here, so we have to clear the stat
+ // cache so that PHP understands that URI has changed too.
+ clearstatcache();
+ return $output;
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::realpath().
+ */
+ function realpath() {
+ return $this->getLocalPath();
+ }
+
+ /**
+ * Returns the canonical absolute path of the URI, if possible.
+ *
+ * @param string $uri
+ * (optional) The stream wrapper URI to be converted to a canonical
+ * absolute path. This may point to a directory or another type of file.
+ *
+ * @return string|bool
+ * If $uri is not set, returns the canonical absolute path of the URI
+ * previously set by the
+ * Drupal\Core\StreamWrapper\StreamWrapperInterface::setUri() function.
+ * If $uri is set and valid for this class, returns its canonical absolute
+ * path, as determined by the realpath() function. If $uri is set but not
+ * valid, returns FALSE.
+ */
+ protected function getLocalPath($uri = NULL) {
+ if (!isset($uri)) {
+ $uri = $this->uri;
+ }
+ $path = $this->getDirectoryPath() . '/' . $this->getTarget($uri);
+ $realpath = realpath($path);
+ if (!$realpath) {
+ // This file does not yet exist.
+ $realpath = realpath(dirname($path)) . '/' . drupal_basename($path);
+ }
+ $directory = realpath($this->getDirectoryPath());
+ if (!$realpath || !$directory || strpos($realpath, $directory) !== 0) {
+ return FALSE;
+ }
+ return $realpath;
+ }
+
+ /**
+ * Support for fopen(), file_get_contents(), file_put_contents() etc.
+ *
+ * @param string $uri
+ * A string containing the URI to the file to open.
+ * @param int $mode
+ * The file mode ("r", "wb" etc.).
+ * @param int $options
+ * A bit mask of STREAM_USE_PATH and STREAM_REPORT_ERRORS.
+ * @param string $opened_path
+ * A string containing the path actually opened.
+ *
+ * @return bool
+ * Returns TRUE if file was opened successfully.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-open.php
+ */
+ public function stream_open($uri, $mode, $options, &$opened_path) {
+ $this->uri = $uri;
+ $path = $this->getLocalPath();
+ $this->handle = ($options & STREAM_REPORT_ERRORS) ? fopen($path, $mode) : @fopen($path, $mode);
+
+ if ((bool) $this->handle && $options & STREAM_USE_PATH) {
+ $opened_path = $path;
+ }
+
+ return (bool) $this->handle;
+ }
+
+ /**
+ * Support for flock().
+ *
+ * @param int $operation
+ * One of the following:
+ * - LOCK_SH to acquire a shared lock (reader).
+ * - LOCK_EX to acquire an exclusive lock (writer).
+ * - LOCK_UN to release a lock (shared or exclusive).
+ * - LOCK_NB if you don't want flock() to block while locking (not
+ * supported on Windows).
+ *
+ * @return bool
+ * Always returns TRUE at the present time.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-lock.php
+ */
+ public function stream_lock($operation) {
+ if (in_array($operation, array(LOCK_SH, LOCK_EX, LOCK_UN, LOCK_NB))) {
+ return flock($this->handle, $operation);
+ }
+
+ return TRUE;
+ }
+
+ /**
+ * Support for fread(), file_get_contents() etc.
+ *
+ * @param int $count
+ * Maximum number of bytes to be read.
+ *
+ * @return string|bool
+ * The string that was read, or FALSE in case of an error.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-read.php
+ */
+ public function stream_read($count) {
+ return fread($this->handle, $count);
+ }
+
+ /**
+ * Support for fwrite(), file_put_contents() etc.
+ *
+ * @param string $data
+ * The string to be written.
+ *
+ * @return int
+ * The number of bytes written.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-write.php
+ */
+ public function stream_write($data) {
+ return fwrite($this->handle, $data);
+ }
+
+ /**
+ * Support for feof().
+ *
+ * @return bool
+ * TRUE if end-of-file has been reached.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-eof.php
+ */
+ public function stream_eof() {
+ return feof($this->handle);
+ }
+
+ /**
+ * Support for fseek().
+ *
+ * @param int $offset
+ * The byte offset to got to.
+ * @param int $whence
+ * SEEK_SET, SEEK_CUR, or SEEK_END.
+ *
+ * @return bool
+ * TRUE on success.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-seek.php
+ */
+ public function stream_seek($offset, $whence) {
+ // fseek returns 0 on success and -1 on a failure.
+ // stream_seek 1 on success and 0 on a failure.
+ return !fseek($this->handle, $offset, $whence);
+ }
+
+ /**
+ * Support for fflush().
+ *
+ * @return bool
+ * TRUE if data was successfully stored (or there was no data to store).
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-flush.php
+ */
+ public function stream_flush() {
+ return fflush($this->handle);
+ }
+
+ /**
+ * Support for ftell().
+ *
+ * @return bool
+ * The current offset in bytes from the beginning of file.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-tell.php
+ */
+ public function stream_tell() {
+ return ftell($this->handle);
+ }
+
+ /**
+ * Support for fstat().
+ *
+ * @return bool
+ * An array with file status, or FALSE in case of an error - see fstat()
+ * for a description of this array.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-stat.php
+ */
+ public function stream_stat() {
+ return fstat($this->handle);
+ }
+
+ /**
+ * Support for fclose().
+ *
+ * @return bool
+ * TRUE if stream was successfully closed.
+ *
+ * @see http://php.net/manual/en/streamwrapper.stream-close.php
+ */
+ public function stream_close() {
+ return fclose($this->handle);
+ }
+
+ /**
+ * Support for unlink().
+ *
+ * @param string $uri
+ * A string containing the uri to the resource to delete.
+ *
+ * @return bool
+ * TRUE if resource was successfully deleted.
+ *
+ * @see http://php.net/manual/en/streamwrapper.unlink.php
+ */
+ public function unlink($uri) {
+ $this->uri = $uri;
+ return drupal_unlink($this->getLocalPath());
+ }
+
+ /**
+ * Support for rename().
+ *
+ * @param string $from_uri,
+ * The uri to the file to rename.
+ * @param string $to_uri
+ * The new uri for file.
+ *
+ * @return bool
+ * TRUE if file was successfully renamed.
+ *
+ * @see http://php.net/manual/en/streamwrapper.rename.php
+ */
+ public function rename($from_uri, $to_uri) {
+ return rename($this->getLocalPath($from_uri), $this->getLocalPath($to_uri));
+ }
+
+ /**
+ * Gets the name of the directory from a given path.
+ *
+ * This method is usually accessed through drupal_dirname(), which wraps
+ * around the PHP dirname() function because it does not support stream
+ * wrappers.
+ *
+ * @param string $uri
+ * A URI or path.
+ *
+ * @return string
+ * A string containing the directory name.
+ *
+ * @see drupal_dirname()
+ */
+ public function dirname($uri = NULL) {
+ list($scheme, $target) = explode('://', $uri, 2);
+ $target = $this->getTarget($uri);
+ $dirname = dirname($target);
+
+ if ($dirname == '.') {
+ $dirname = '';
+ }
+
+ return $scheme . '://' . $dirname;
+ }
+
+ /**
+ * Support for mkdir().
+ *
+ * @param string $uri
+ * A string containing the URI to the directory to create.
+ * @param int $mode
+ * Permission flags - see mkdir().
+ * @param int $options
+ * A bit mask of STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE.
+ *
+ * @return bool
+ * TRUE if directory was successfully created.
+ *
+ * @see http://php.net/manual/en/streamwrapper.mkdir.php
+ */
+ public function mkdir($uri, $mode, $options) {
+ $this->uri = $uri;
+ $recursive = (bool) ($options & STREAM_MKDIR_RECURSIVE);
+ if ($recursive) {
+ // $this->getLocalPath() fails if $uri has multiple levels of directories
+ // that do not yet exist.
+ $localpath = $this->getDirectoryPath() . '/' . $this->getTarget($uri);
+ }
+ else {
+ $localpath = $this->getLocalPath($uri);
+ }
+ if ($options & STREAM_REPORT_ERRORS) {
+ return mkdir($localpath, $mode, $recursive);
+ }
+ else {
+ return @mkdir($localpath, $mode, $recursive);
+ }
+ }
+
+ /**
+ * Support for rmdir().
+ *
+ * @param string $uri
+ * A string containing the URI to the directory to delete.
+ * @param int $options
+ * A bit mask of STREAM_REPORT_ERRORS.
+ *
+ * @return bool
+ * TRUE if directory was successfully removed.
+ *
+ * @see http://php.net/manual/en/streamwrapper.rmdir.php
+ */
+ public function rmdir($uri, $options) {
+ $this->uri = $uri;
+ if ($options & STREAM_REPORT_ERRORS) {
+ return drupal_rmdir($this->getLocalPath());
+ }
+ else {
+ return @drupal_rmdir($this->getLocalPath());
+ }
+ }
+
+ /**
+ * Support for stat().
+ *
+ * @param string $uri
+ * A string containing the URI to get information about.
+ * @param int $flags
+ * A bit mask of STREAM_URL_STAT_LINK and STREAM_URL_STAT_QUIET.
+ *
+ * @return array
+ * An array with file status, or FALSE in case of an error - see fstat()
+ * for a description of this array.
+ *
+ * @see http://php.net/manual/en/streamwrapper.url-stat.php
+ */
+ public function url_stat($uri, $flags) {
+ $this->uri = $uri;
+ $path = $this->getLocalPath();
+ // Suppress warnings if requested or if the file or directory does not
+ // exist. This is consistent with PHP's plain filesystem stream wrapper.
+ if ($flags & STREAM_URL_STAT_QUIET || !file_exists($path)) {
+ return @stat($path);
+ }
+ else {
+ return stat($path);
+ }
+ }
+
+ /**
+ * Support for opendir().
+ *
+ * @param string $uri
+ * A string containing the URI to the directory to open.
+ * @param int $options
+ * Unknown (parameter is not documented in PHP Manual).
+ *
+ * @return bool
+ * TRUE on success.
+ *
+ * @see http://php.net/manual/en/streamwrapper.dir-opendir.php
+ */
+ public function dir_opendir($uri, $options) {
+ $this->uri = $uri;
+ $this->handle = opendir($this->getLocalPath());
+
+ return (bool) $this->handle;
+ }
+
+ /**
+ * Support for readdir().
+ *
+ * @return string
+ * The next filename, or FALSE if there are no more files in the directory.
+ *
+ * @see http://php.net/manual/en/streamwrapper.dir-readdir.php
+ */
+ public function dir_readdir() {
+ return readdir($this->handle);
+ }
+
+ /**
+ * Support for rewinddir().
+ *
+ * @return bool
+ * TRUE on success.
+ *
+ * @see http://php.net/manual/en/streamwrapper.dir-rewinddir.php
+ */
+ public function dir_rewinddir() {
+ rewinddir($this->handle);
+ // We do not really have a way to signal a failure as rewinddir() does not
+ // have a return value and there is no way to read a directory handler
+ // without advancing to the next file.
+ return TRUE;
+ }
+
+ /**
+ * Support for closedir().
+ *
+ * @return bool
+ * TRUE on success.
+ *
+ * @see http://php.net/manual/en/streamwrapper.dir-closedir.php
+ */
+ public function dir_closedir() {
+ closedir($this->handle);
+ // We do not really have a way to signal a failure as closedir() does not
+ // have a return value.
+ return TRUE;
+ }
+}
diff --git a/core/lib/Drupal/Core/StreamWrapper/PhpStreamWrapperInterface.php b/core/lib/Drupal/Core/StreamWrapper/PhpStreamWrapperInterface.php
new file mode 100644
index 0000000000000000000000000000000000000000..4cf41e08730afb3f423b712f05183b4b8ad926e2
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/PhpStreamWrapperInterface.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\PhpStreamWrapperInterface.
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Defines a generic PHP stream wrapper interface.
+ *
+ * @see http://www.php.net/manual/en/class.streamwrapper.php
+ */
+interface PhpStreamWrapperInterface {
+ public function stream_open($uri, $mode, $options, &$opened_url);
+ public function stream_close();
+ public function stream_lock($operation);
+ public function stream_read($count);
+ public function stream_write($data);
+ public function stream_eof();
+ public function stream_seek($offset, $whence);
+ public function stream_flush();
+ public function stream_tell();
+ public function stream_stat();
+ public function unlink($uri);
+ public function rename($from_uri, $to_uri);
+ public function mkdir($uri, $mode, $options);
+ public function rmdir($uri, $options);
+ public function url_stat($uri, $flags);
+ public function dir_opendir($uri, $options);
+ public function dir_readdir();
+ public function dir_rewinddir();
+ public function dir_closedir();
+}
diff --git a/core/lib/Drupal/Core/StreamWrapper/PrivateStream.php b/core/lib/Drupal/Core/StreamWrapper/PrivateStream.php
new file mode 100644
index 0000000000000000000000000000000000000000..87316eb4f5f9784c9c05562a140c929a3cacf0b5
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/PrivateStream.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\PrivateStream.
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Drupal private (private://) stream wrapper class.
+ *
+ * Provides support for storing privately accessible files with the Drupal file
+ * interface.
+ */
+class PrivateStream extends LocalStream {
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\LocalStream::getDirectoryPath()
+ */
+ public function getDirectoryPath() {
+ return variable_get('file_private_path', '');
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getExternalUrl().
+ *
+ * @return string
+ * Returns the HTML URI of a private file.
+ */
+ function getExternalUrl() {
+ $path = str_replace('\\', '/', $this->getTarget());
+ return url('system/files/' . $path, array('absolute' => TRUE));
+ }
+}
diff --git a/core/lib/Drupal/Core/StreamWrapper/PublicStream.php b/core/lib/Drupal/Core/StreamWrapper/PublicStream.php
new file mode 100644
index 0000000000000000000000000000000000000000..207b77a5b651eb16be752c917aa16333e94d9626
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/PublicStream.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\PublicStream.
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Defines a Drupal public (public://) stream wrapper class.
+ *
+ * Provides support for storing publicly accessible files with the Drupal file
+ * interface.
+ */
+class PublicStream extends LocalStream {
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\LocalStream::getDirectoryPath()
+ */
+ public function getDirectoryPath() {
+ return variable_get('file_public_path', conf_path() . '/files');
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getExternalUrl().
+ *
+ * @return string
+ * Returns the HTML URI of a public file.
+ */
+ function getExternalUrl() {
+ $path = str_replace('\\', '/', $this->getTarget());
+ return $GLOBALS['base_url'] . '/' . self::getDirectoryPath() . '/' . drupal_encode_path($path);
+ }
+}
diff --git a/core/lib/Drupal/Core/StreamWrapper/StreamWrapperInterface.php b/core/lib/Drupal/Core/StreamWrapper/StreamWrapperInterface.php
new file mode 100644
index 0000000000000000000000000000000000000000..15ba2cf1b0744a7289fd561121ef3e298efbd639
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/StreamWrapperInterface.php
@@ -0,0 +1,125 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\StreamWrapperInterface.
+ *
+ * Provides a Drupal interface and classes to implement PHP stream wrappers for
+ * public, private, and temporary files.
+ *
+ * A stream wrapper is an abstraction of a file system that allows Drupal to
+ * use the same set of methods to access both local files and remote resources.
+ *
+ * Note that PHP 5.2 fopen() only supports URIs of the form "scheme://target"
+ * despite the fact that according to RFC 3986 a URI's scheme component
+ * delimiter is in general just ":", not "://". Because of this PHP limitation
+ * and for consistency Drupal will only accept URIs of form "scheme://target".
+ *
+ * @see http://www.faqs.org/rfcs/rfc3986.html
+ * @see http://bugs.php.net/bug.php?id=47070
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Defines a Drupal stream wrapper extension.
+ *
+ * Extends the StreamWrapperInterface with methods expected by Drupal stream
+ * wrapper classes.
+ */
+interface StreamWrapperInterface extends PhpStreamWrapperInterface {
+
+ /**
+ * Sets the absolute stream resource URI.
+ *
+ * This allows you to set the URI. Generally is only called by the factory
+ * method.
+ *
+ * @param string $uri
+ * A string containing the URI that should be used for this instance.
+ */
+ function setUri($uri);
+
+ /**
+ * Returns the stream resource URI.
+ *
+ * @return string
+ * Returns the current URI of the instance.
+ */
+ public function getUri();
+
+ /**
+ * Returns a web accessible URL for the resource.
+ *
+ * This function should return a URL that can be embedded in a web page
+ * and accessed from a browser. For example, the external URL of
+ * "youtube://xIpLd0WQKCY" might be
+ * "http://www.youtube.com/watch?v=xIpLd0WQKCY".
+ *
+ * @return string
+ * Returns a string containing a web accessible URL for the resource.
+ */
+ public function getExternalUrl();
+
+ /**
+ * Returns the MIME type of the resource.
+ *
+ * @param string $uri
+ * The URI, path, or filename.
+ * @param array $mapping
+ * An optional map of extensions to their mimetypes, in the form:
+ * - 'mimetypes': a list of mimetypes, keyed by an identifier,
+ * - 'extensions': the mapping itself, an associative array in which
+ * the key is the extension and the value is the mimetype identifier.
+ *
+ * @return string
+ * Returns a string containing the MIME type of the resource.
+ */
+ public static function getMimeType($uri, $mapping = NULL);
+
+ /**
+ * Changes permissions of the resource.
+ *
+ * PHP lacks this functionality and it is not part of the official stream
+ * wrapper interface. This is a custom implementation for Drupal.
+ *
+ * @param int $mode
+ * Integer value for the permissions. Consult PHP chmod() documentation
+ * for more information.
+ *
+ * @return bool
+ * Returns TRUE on success or FALSE on failure.
+ */
+ public function chmod($mode);
+
+ /**
+ * Returns canonical, absolute path of the resource.
+ *
+ * Implementation placeholder. PHP's realpath() does not support stream
+ * wrappers. We provide this as a default so that individual wrappers may
+ * implement their own solutions.
+ *
+ * @return string
+ * Returns a string with absolute pathname on success (implemented
+ * by core wrappers), or FALSE on failure or if the registered
+ * wrapper does not provide an implementation.
+ */
+ public function realpath();
+
+ /**
+ * Gets the name of the directory from a given path.
+ *
+ * This method is usually accessed through drupal_dirname(), which wraps
+ * around the normal PHP dirname() function, which does not support stream
+ * wrappers.
+ *
+ * @param string $uri
+ * An optional URI.
+ *
+ * @return string
+ * A string containing the directory name, or FALSE if not applicable.
+ *
+ * @see drupal_dirname()
+ */
+ public function dirname($uri = NULL);
+}
diff --git a/core/lib/Drupal/Core/StreamWrapper/TemporaryStream.php b/core/lib/Drupal/Core/StreamWrapper/TemporaryStream.php
new file mode 100644
index 0000000000000000000000000000000000000000..52a63212ffcfb42d040a26149ea84383b9f57fe5
--- /dev/null
+++ b/core/lib/Drupal/Core/StreamWrapper/TemporaryStream.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Core\StreamWrapper\TemporaryStream.
+ */
+
+namespace Drupal\Core\StreamWrapper;
+
+/**
+ * Defines a Drupal temporary (temporary://) stream wrapper class.
+ *
+ * Provides support for storing temporarily accessible files with the Drupal
+ * file interface.
+ */
+class TemporaryStream extends LocalStream {
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\LocalStream::getDirectoryPath()
+ */
+ public function getDirectoryPath() {
+ return variable_get('file_temporary_path', file_directory_temp());
+ }
+
+ /**
+ * Implements Drupal\Core\StreamWrapper\StreamWrapperInterface::getExternalUrl().
+ */
+ public function getExternalUrl() {
+ $path = str_replace('\\', '/', $this->getTarget());
+ return url('system/temporary/' . $path, array('absolute' => TRUE));
+ }
+}