file.inc in Drupal 4
Same filename and directory in other branches
API for handling file uploads and server file management.
File
includes/file.incView source
<?php
/**
* @file
* API for handling file uploads and server file management.
*/
/**
* @defgroup file File interface
* @{
* Common file handling functions.
*/
define('FILE_DOWNLOADS_PUBLIC', 1);
define('FILE_DOWNLOADS_PRIVATE', 2);
define('FILE_CREATE_DIRECTORY', 1);
define('FILE_MODIFY_PERMISSIONS', 2);
define('FILE_EXISTS_RENAME', 0);
define('FILE_EXISTS_REPLACE', 1);
define('FILE_EXISTS_ERROR', 2);
/**
* Create the download path to a file.
*
* @param $path A string containing the path of the file to generate URL for.
* @return A string containing a URL that can be used to download the file.
*/
function file_create_url($path) {
// Strip file_directory_path from $path. We only include relative paths in urls.
if (strpos($path, file_directory_path() . '/') === 0) {
$path = trim(substr($path, strlen(file_directory_path())), '\\/');
}
switch (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC)) {
case FILE_DOWNLOADS_PUBLIC:
return $GLOBALS['base_url'] . '/' . file_directory_path() . '/' . str_replace('\\', '/', $path);
case FILE_DOWNLOADS_PRIVATE:
return url('system/files/' . $path, NULL, NULL, TRUE);
}
}
/**
* Make sure the destination is a complete path and resides in the file system
* directory, if it is not prepend the file system directory.
*
* @param $dest A string containing the path to verify. If this value is
* omitted, Drupal's 'files' directory will be used.
* @return A string containing the path to file, with file system directory
* appended if necessary, or FALSE if the path is invalid (i.e. outside the
* configured 'files' or temp directories).
*/
function file_create_path($dest = 0) {
$file_path = file_directory_path();
if (!$dest) {
return $file_path;
}
// file_check_location() checks whether the destination is inside the Drupal files directory.
if (file_check_location($dest, $file_path)) {
return $dest;
}
else {
if (file_check_location($dest, file_directory_temp())) {
return $dest;
}
else {
if (file_check_location($file_path . '/' . $dest, $file_path)) {
return $file_path . '/' . $dest;
}
}
}
// File not found.
return FALSE;
}
/**
* Check that the directory exists and is writable. Directories need to
* have execute permissions to be considered a directory by FTP servers, etc.
*
* @param $directory A string containing the name of a directory path.
* @param $mode A Boolean value to indicate if the directory should be created
* if it does not exist or made writable if it is read-only.
* @param $form_item An optional string containing the name of a form item that
* any errors will be attached to. This is useful for settings forms that
* require the user to specify a writable directory. If it can't be made to
* work, a form error will be set preventing them from saving the settings.
* @return False when directory not found, or true when directory exists.
*/
function file_check_directory(&$directory, $mode = 0, $form_item = NULL) {
$directory = rtrim($directory, '/\\');
// Check if directory exists.
if (!is_dir($directory)) {
if ($mode & FILE_CREATE_DIRECTORY && @mkdir($directory)) {
drupal_set_message(t('The directory %directory has been created.', array(
'%directory' => theme('placeholder', $directory),
)));
@chmod($directory, 0775);
// Necessary for non-webserver users.
}
else {
if ($form_item) {
form_set_error($form_item, t('The directory %directory does not exist.', array(
'%directory' => theme('placeholder', $directory),
)));
}
return false;
}
}
// Check to see if the directory is writable.
if (!is_writable($directory)) {
if ($mode & FILE_MODIFY_PERMISSIONS && @chmod($directory, 0775)) {
drupal_set_message(t('The permissions of directory %directory have been changed to make it writable.', array(
'%directory' => theme('placeholder', $directory),
)));
}
else {
form_set_error($form_item, t('The directory %directory is not writable', array(
'%directory' => theme('placeholder', $directory),
)));
watchdog('file system', t('The directory %directory is not writable, because it does not have the correct permissions set.', array(
'%directory' => theme('placeholder', $directory),
)), WATCHDOG_ERROR);
return false;
}
}
if ((file_directory_path() == $directory || file_directory_temp() == $directory) && !is_file("{$directory}/.htaccess")) {
$htaccess_lines = "SetHandler Drupal_Security_Do_Not_Remove_See_SA_2006_006\nOptions None\nOptions +FollowSymLinks";
if (($fp = fopen("{$directory}/.htaccess", 'w')) && fputs($fp, $htaccess_lines)) {
fclose($fp);
chmod($directory . '/.htaccess', 0664);
}
else {
$message = t("Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>%htaccess</code>", array(
'%directory' => theme('placeholder', $directory),
'%htaccess' => '<br />' . str_replace("\n", '<br />', check_plain($htaccess_lines)),
));
form_set_error($form_item, $message);
watchdog('security', $message, WATCHDOG_ERROR);
}
}
return true;
}
/**
* Checks path to see if it is a directory, or a dir/file.
*
* @param $path A string containing a file path. This will be set to the
* directory's path.
* @return If the directory is not in a Drupal writable directory, FALSE is
* returned. Otherwise, the base name of the path is returned.
*/
function file_check_path(&$path) {
// Check if path is a directory.
if (file_check_directory($path)) {
return '';
}
// Check if path is a possible dir/file.
$filename = basename($path);
$path = dirname($path);
if (file_check_directory($path)) {
return $filename;
}
return false;
}
/**
* Check if $source is a valid file upload. If so, move the file to Drupal's tmp dir
* and return it as an object.
*
* The use of SESSION['file_uploads'] should probably be externalized to upload.module
*
* @todo Rename file_check_upload to file_prepare upload.
* @todo Refactor or merge file_save_upload.
* @todo Extenalize SESSION['file_uploads'] to modules.
*
* @param $source An upload source (the name of the upload form item), or a file
* @return false for an invalid file or upload. A file object for valid uploads/files.
*
*/
function file_check_upload($source = 'upload') {
// Cache for uploaded files. Since the data in _FILES is modified
// by this function, we cache the result.
static $upload_cache;
// Test source to see if it is an object.
if (is_object($source)) {
// Validate the file path if an object was passed in instead of
// an upload key.
if (is_file($source->filepath)) {
return $source;
}
else {
return false;
}
}
// Return cached objects without processing since the file will have
// already been processed and the paths in _FILES will be invalid.
if (isset($upload_cache[$source])) {
return $upload_cache[$source];
}
// If a file was uploaded, process it.
if ($_FILES["edit"]["name"][$source] && is_uploaded_file($_FILES["edit"]["tmp_name"][$source])) {
// Check for file upload errors and return false if a
// lower level system error occurred.
switch ($_FILES["edit"]["error"][$source]) {
// @see http://php.net/manual/en/features.file-upload.errors.php
case UPLOAD_ERR_OK:
break;
case UPLOAD_ERR_INI_SIZE:
case UPLOAD_ERR_FORM_SIZE:
drupal_set_message(t('The file %file could not be saved, because it exceeds the maximum allowed size for uploads.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
case UPLOAD_ERR_PARTIAL:
case UPLOAD_ERR_NO_FILE:
drupal_set_message(t('The file %file could not be saved, because the upload did not complete.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
// Unknown error
default:
drupal_set_message(t('The file %file could not be saved. An unknown error has occurred.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
}
// Begin building file object.
$file = new StdClass();
$file->filename = trim(basename($_FILES["edit"]["name"][$source]), '.');
// Create temporary name/path for newly uploaded files.
$file->filepath = tempnam(file_directory_temp(), 'tmp_');
$file->filemime = $_FILES["edit"]["type"][$source];
// Rename potentially executable files, to help prevent exploits.
if ((substr($file->filemime, 0, 5) == 'text/' || strpos($file->filemime, 'javascript')) && substr($file->filename, -4) != '.txt' || preg_match('/\\.(php|pl|py|cgi|asp)$/i', $file->filename)) {
$file->filemime = 'text/plain';
$file->filepath .= '.txt';
$file->filename .= '.txt';
}
// Move uploaded files from php's upload_tmp_dir to Drupal's file temp.
// This overcomes open_basedir restrictions for future file operations.
if (!move_uploaded_file($_FILES["edit"]["tmp_name"][$source], $file->filepath)) {
drupal_set_message(t('File upload error. Could not move uploaded file.'));
watchdog('file', t('Upload Error. Could not move uploaded file(%file) to destination(%destination).', array(
'%file' => theme('placeholder', $_FILES["edit"]["tmp_name"][$source]),
'%destination' => theme('placeholder', $file->filepath),
)));
return false;
}
$file->filesize = $_FILES["edit"]["size"][$source];
$file->source = $source;
// Add processed file to the cache.
$upload_cache[$source] = $file;
return $file;
}
else {
// In case of previews return previous file object.
if (file_exists($_SESSION['file_uploads'][$source]->filepath)) {
return $_SESSION['file_uploads'][$source];
}
}
// If nothing was done, return false.
return false;
}
/**
* Check if a file is really located inside $directory. Should be used to make
* sure a file specified is really located within the directory to prevent
* exploits.
*
* @code
* // Returns false:
* file_check_location('/www/example.com/files/../../../etc/passwd', '/www/example.com/files');
* @endcode
*
* @param $source A string set to the file to check.
* @param $directory A string where the file should be located.
* @return 0 for invalid path or the real path of the source.
*/
function file_check_location($source, $directory = '') {
$check = realpath($source);
if ($check) {
$source = $check;
}
else {
// This file does not yet exist
$source = realpath(dirname($source)) . '/' . basename($source);
}
$directory = realpath($directory);
if ($directory && strpos($source, $directory) !== 0) {
return 0;
}
return $source;
}
/**
* Copies a file to a new location. This is a powerful function that in many ways
* performs like an advanced version of copy().
* - Checks if $source and $dest are valid and readable/writable.
* - Performs a file copy if $source is not equal to $dest.
* - If file already exists in $dest either the call will error out, replace the
* file or rename the file based on the $replace parameter.
*
* @param $source A string specifying the file location of the original file.
* This parameter will contain the resulting destination filename in case of
* success.
* @param $dest A string containing the directory $source should be copied to.
* If this value is omitted, Drupal's 'files' directory will be used.
* @param $replace Replace behavior when the destination file already exists.
* - FILE_EXISTS_REPLACE - Replace the existing file
* - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique
* - FILE_EXISTS_ERROR - Do nothing and return false.
* @return True for success, false for failure.
*/
function file_copy(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
$dest = file_create_path($dest);
$directory = $dest;
$basename = file_check_path($directory);
// Make sure we at least have a valid directory.
if ($basename === false) {
$source = is_object($source) ? $source->filepath : $source;
drupal_set_message(t('The selected file %file could not be uploaded, because the destination %directory is not properly configured.', array(
'%file' => theme('placeholder', $source),
'%directory' => theme('placeholder', $dest),
)), 'error');
watchdog('file system', t('The selected file %file could not be uploaded, because the destination %directory could not be found, or because its permissions do not allow the file to be written.', array(
'%file' => theme('placeholder', $source),
'%directory' => theme('placeholder', $dest),
)), WATCHDOG_ERROR);
return 0;
}
// Process a file upload object.
if (is_object($source)) {
$file = $source;
$source = $file->filepath;
if (!$basename) {
$basename = $file->filename;
}
}
$source = realpath($source);
if (!file_exists($source)) {
drupal_set_message(t('The selected file %file could not be copied, because no file by that name exists. Please check that you supplied the correct filename.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
}
// If the destination file is not specified then use the filename of the source file.
$basename = $basename ? $basename : basename($source);
$dest = $directory . '/' . $basename;
// Make sure source and destination filenames are not the same, makes no sense
// to copy it if they are. In fact copying the file will most likely result in
// a 0 byte file. Which is bad. Real bad.
if ($source != realpath($dest)) {
if (file_exists($dest)) {
switch ($replace) {
case FILE_EXISTS_RENAME:
// Destination file already exists and we can't replace is so we try and
// and find a new filename.
if ($pos = strrpos($basename, '.')) {
$name = substr($basename, 0, $pos);
$ext = substr($basename, $pos);
}
else {
$name = $basename;
}
$counter = 0;
do {
$dest = $directory . '/' . $name . '_' . $counter++ . $ext;
} while (file_exists($dest));
break;
case FILE_EXISTS_ERROR:
drupal_set_message(t('The selected file %file could not be copied, because a file by that name already exists in the destination.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
}
}
if (!@copy($source, $dest)) {
drupal_set_message(t('The selected file %file could not be copied.', array(
'%file' => theme('placeholder', $source),
)), 'error');
return 0;
}
// Give everyone read access so that FTP'd users or
// non-webserver users can see/read these files.
@chmod($dest, 0664);
}
if (is_object($file)) {
$file->filename = $basename;
$file->filepath = $dest;
$source = $file;
}
else {
$source = $dest;
}
return 1;
// Everything went ok.
}
/**
* Moves a file to a new location.
* - Checks if $source and $dest are valid and readable/writable.
* - Performs a file move if $source is not equal to $dest.
* - If file already exists in $dest either the call will error out, replace the
* file or rename the file based on the $replace parameter.
*
* @param $source A string specifying the file location of the original file.
* This parameter will contain the resulting destination filename in case of
* success.
* @param $dest A string containing the directory $source should be copied to.
* If this value is omitted, Drupal's 'files' directory will be used.
* @param $replace Replace behavior when the destination file already exists.
* - FILE_EXISTS_REPLACE - Replace the existing file
* - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique
* - FILE_EXISTS_ERROR - Do nothing and return false.
* @return True for success, false for failure.
*/
function file_move(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
$path_original = is_object($source) ? $source->filepath : $source;
if (file_copy($source, $dest, $replace)) {
$path_current = is_object($source) ? $source->filepath : $source;
if ($path_original == $path_current || file_delete($path_original)) {
return 1;
}
drupal_set_message(t('The removal of the original file %file has failed.', array(
'%file' => theme('placeholder', $path_original),
)), 'error');
}
return 0;
}
/**
* Create a full file path from a directory and filename. If a file with the
* specified name already exists, an alternative will be used.
*
* @param $basename string filename
* @param $directory string directory
* @return
*/
function file_create_filename($basename, $directory) {
$dest = $directory . '/' . $basename;
if (file_exists($dest)) {
// Destination file already exists, generate an alternative.
if ($pos = strrpos($basename, '.')) {
$name = substr($basename, 0, $pos);
$ext = substr($basename, $pos);
}
else {
$name = $basename;
}
$counter = 0;
do {
$dest = $directory . '/' . $name . '_' . $counter++ . $ext;
} while (file_exists($dest));
}
return $dest;
}
/**
* Delete a file.
*
* @param $path A string containing a file path.
* @return True for success, false for failure.
*/
function file_delete($path) {
if (is_file($path)) {
return unlink($path);
}
}
/**
* Saves a file upload to a new location. The source file is validated as a
* proper upload and handled as such.
*
* @param $source A string specifying the name of the upload field to save.
* This parameter will contain the resulting destination filename in case of
* success.
* @param $dest A string containing the directory $source should be copied to,
* will use the temporary directory in case no other value is set.
* @param $replace A boolean, set to true if the destination should be replaced
* when in use, but when false append a _X to the filename.
* @return An object containing file info or 0 in case of error.
*/
function file_save_upload($source, $dest = false, $replace = FILE_EXISTS_RENAME) {
// Make sure $source exists && is valid.
if ($file = file_check_upload($source)) {
// This should be refactored, file_check_upload has already
// moved the file to the temporary folder.
if (!$dest) {
$dest = file_directory_temp();
$temporary = 1;
if (is_file($file->filepath)) {
// If this file was uploaded by this user before replace the temporary copy.
$replace = FILE_EXISTS_REPLACE;
}
}
unset($_SESSION['file_uploads'][is_object($source) ? $source->source : $source]);
if (file_move($file, $dest, $replace)) {
if ($temporary) {
$_SESSION['file_uploads'][is_object($source) ? $source->source : $source] = $file;
}
return $file;
}
return 0;
}
return 0;
}
/**
* Save a string to the specified destination.
*
* @param $data A string containing the contents of the file.
* @param $dest A string containing the destination location.
* @param $replace Replace behavior when the destination file already exists.
* - FILE_EXISTS_REPLACE - Replace the existing file
* - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique
* - FILE_EXISTS_ERROR - Do nothing and return false.
*
* @return A string containing the resulting filename or 0 on error
*/
function file_save_data($data, $dest, $replace = FILE_EXISTS_RENAME) {
$temp = file_directory_temp();
$file = tempnam($temp, 'file');
if (!($fp = fopen($file, 'wb'))) {
drupal_set_message(t('The file could not be created.'), 'error');
return 0;
}
fwrite($fp, $data);
fclose($fp);
if (!file_move($file, $dest, $replace)) {
return 0;
}
return $file;
}
/**
* Transfer file using http to client. Pipes a file through Drupal to the
* client.
*
* @param $source File to transfer.
* @param $headers An array of http headers to send along with file.
*/
function file_transfer($source, $headers) {
ob_end_clean();
foreach ($headers as $header) {
// To prevent HTTP header injection, we delete new lines that are
// not followed by a space or a tab.
// See http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
$header = preg_replace('/\\r?\\n(?!\\t| )/', '', $header);
header($header);
}
$source = file_create_path($source);
// Transfer file in 1024 byte chunks to save memory usage.
if ($fd = fopen($source, 'rb')) {
while (!feof($fd)) {
print fread($fd, 1024);
}
fclose($fd);
}
else {
drupal_not_found();
}
exit;
}
/**
* Call modules that implement hook_file_download() to find out if a file is
* accessible and what headers it should be transferred with. If a module
* returns -1 drupal_access_denied() will be returned. If one or more modules
* returned headers the download will start with the returned headers. If no
* modules respond drupal_not_found() will be returned.
*/
function file_download() {
// Merge remainder of arguments from GET['q'], into relative file path.
$args = func_get_args();
$filepath = implode('/', $args);
// Maintain compatibility with old ?file=paths saved in node bodies.
if (isset($_GET['file'])) {
$filepath = $_GET['file'];
}
if (file_exists(file_create_path($filepath))) {
$headers = module_invoke_all('file_download', $filepath);
if (in_array(-1, $headers)) {
return drupal_access_denied();
}
if (count($headers)) {
file_transfer($filepath, $headers);
}
}
return drupal_not_found();
}
/**
* Finds all files that match a given mask in a given
* directory. Directories and files beginning with a period are excluded.
*
* @param $dir
* The base directory for the scan.
* @param $mask
* The regular expression of the files to find.
* @param $nomask
* An array of files/directories to ignore.
* @param $callback
* The callback function to call for each match.
* @param $recurse
* When TRUE, the directory scan will recurse the entire tree
* starting at the provided directory.
* @param $key
* The key to be used for the returned array of files. Possible
* values are "filename", for the path starting with $dir,
* "basename", for the basename of the file, and "name" for the name
* of the file without an extension.
* @param $min_depth
* Minimum depth of directories to return files from.
* @param $depth
* Current depth of recursion. This parameter is only used internally and should not be passed.
*
* @return
* An associative array (keyed on the provided key) of objects with
* "path", "basename", and "name" members corresponding to the
* matching files.
*/
function file_scan_directory($dir, $mask, $nomask = array(
'.',
'..',
'CVS',
), $callback = 0, $recurse = TRUE, $key = 'filename', $min_depth = 0, $depth = 0) {
$key = in_array($key, array(
'filename',
'basename',
'name',
)) ? $key : 'filename';
$files = array();
if (is_dir($dir) && ($handle = opendir($dir))) {
while ($file = readdir($handle)) {
if (!in_array($file, $nomask) && $file[0] != '.') {
if (is_dir("{$dir}/{$file}") && $recurse) {
$files = array_merge($files, file_scan_directory("{$dir}/{$file}", $mask, $nomask, $callback, $recurse, $key, $min_depth, $depth + 1));
}
elseif ($depth >= $min_depth && ereg($mask, $file)) {
$filename = "{$dir}/{$file}";
$basename = basename($file);
$name = substr($basename, 0, strrpos($basename, '.'));
$files[${$key}] = new stdClass();
$files[${$key}]->filename = $filename;
$files[${$key}]->basename = $basename;
$files[${$key}]->name = $name;
if ($callback) {
$callback($filename);
}
}
}
}
closedir($handle);
}
return $files;
}
/**
* Determine the default temporary directory.
*
* @return A string containing a temp directory.
*/
function file_directory_temp() {
$temporary_directory = variable_get('file_directory_temp', NULL);
if (is_null($temporary_directory)) {
$directories = array();
// Has PHP been set with an upload_tmp_dir?
if (ini_get('upload_tmp_dir')) {
$directories[] = ini_get('upload_tmp_dir');
}
// Operating system specific dirs.
if (substr(PHP_OS, 0, 3) == 'WIN') {
$directories[] = 'c:\\windows\\temp';
$directories[] = 'c:\\winnt\\temp';
$path_delimiter = '\\';
}
else {
$directories[] = '/tmp';
$path_delimiter = '/';
}
foreach ($directories as $directory) {
if (!$temporary_directory && is_dir($directory)) {
$temporary_directory = $directory;
}
}
// if a directory has been found, use it, otherwise default to 'files/tmp' or 'files\\tmp';
$temporary_directory = $temporary_directory ? $temporary_directory : file_directory_path() . $path_delimiter . 'tmp';
variable_set('file_directory_temp', $temporary_directory);
}
return $temporary_directory;
}
/**
* Determine the default 'files' directory.
*
* @return A string containing the path to Drupal's 'files' directory.
*/
function file_directory_path() {
return variable_get('file_directory_path', 'files');
}
/**
* Helper function for file_upload_max_size().
*/
function _file_convert_to_mb($val) {
$val = trim($val);
$last = strtolower($val[strlen($val) - 1]);
switch ($last) {
// The 'G' modifier is available since PHP 5.1.0
case 'g':
$size = $val * 1024;
break;
case 'k':
$size = $val / 1024;
break;
default:
$size = (int) $val;
}
return $size;
}
/**
* Determine the maximum file upload size by querying the PHP settings.
*
* @return
* A file size limit in MB based on the PHP upload_max_filesize and post_max_size
*/
function file_upload_max_size() {
static $max_size = -1;
if ($max_size < 0) {
$upload_max = _file_convert_to_mb(ini_get('upload_max_filesize'));
// sanity check- a single upload should not be more than 50% the size limit of the total post
$post_max = _file_convert_to_mb(ini_get('post_max_size')) / 2;
$max_size = $upload_max < $post_max ? $upload_max : $post_max;
}
return $max_size;
}Functions
Name |
Description |
|---|---|
| file_check_directory | Check that the directory exists and is writable. Directories need to have execute permissions to be considered a directory by FTP servers, etc. |
| file_check_location | Check if a file is really located inside $directory. Should be used to make sure a file specified is really located within the directory to prevent exploits. |
| file_check_path | Checks path to see if it is a directory, or a dir/file. |
| file_check_upload | Check if $source is a valid file upload. If so, move the file to Drupal's tmp dir and return it as an object. |
| file_copy | Copies a file to a new location. This is a powerful function that in many ways performs like an advanced version of copy(). |
| file_create_filename | Create a full file path from a directory and filename. If a file with the specified name already exists, an alternative will be used. |
| file_create_path | Make sure the destination is a complete path and resides in the file system directory, if it is not prepend the file system directory. |
| file_create_url | Create the download path to a file. |
| file_delete | Delete a file. |
| file_directory_path | Determine the default 'files' directory. |
| file_directory_temp | Determine the default temporary directory. |
| file_download | Call modules that implement hook_file_download() to find out if a file is accessible and what headers it should be transferred with. If a module returns -1 drupal_access_denied() will be returned. If one or more modules returned headers the download… |
| file_move | Moves a file to a new location. |
| file_save_data | Save a string to the specified destination. |
| file_save_upload | Saves a file upload to a new location. The source file is validated as a proper upload and handled as such. |
| file_scan_directory | Finds all files that match a given mask in a given directory. Directories and files beginning with a period are excluded. |
| file_transfer | Transfer file using http to client. Pipes a file through Drupal to the client. |
| file_upload_max_size | Determine the maximum file upload size by querying the PHP settings. |
| _file_convert_to_mb | Helper function for file_upload_max_size(). |