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我修改 drupal6 的 /includes/file.inc 文件 让上传变成唯一性 $prefix = $user->uid.'_'.date('YmdHis').'_'.md5(uniqid(rand(), true));

shiping1 的头像
file.inc 文件 就是如下 
<?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);

/**
 * A files status can be one of two values: temporary or permanent. The status
 * for each file Drupal manages is stored in the {files} tables. If the status
 * is temporary Drupal's file garbage collection will delete the file and
 * remove it from the files table after a set period of time.
 *
 * If you wish to add custom statuses for use by contrib modules please expand as
 * binary flags and consider the first 8 bits reserved. (0,1,2,4,8,16,32,64,128)
 */
define('FILE_STATUS_TEMPORARY', 0);
define('FILE_STATUS_PERMANENT', 1);

/**
 * 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, array('absolute' => 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 $dest;
    }
    // check if the destination is instead inside the Drupal temporary files directory.
    else if (file_check_location($dest, file_directory_temp())) {
        return $dest;
    }
    // Not found, try again with prefixed directory path.
    else if (file_check_location($file_path .'/'. $dest, $file_path)) {
        return $file_path .'/'. $dest;
    }
    // File not found.
    return FALSE;
}

/**
 * Checks whether a directory exists and is writable.
 *
 * Furthermore, the directory can optionally be created if it does not exist,
 * and/or be set to writable if it is currently not. Directories need to have
 * execute permission to be considered a directory by FTP servers.
 *
 * @param $directory
 *   A string representing the directory path.
 * @param $mode
 *   An optional bitmask containing the actions, if any, to be carried out on
 *   the directory. Any combination of the actions FILE_CREATE_DIRECTORY and
 *   FILE_MODIFY_PERMISSIONS is allowed.
 * @param $form_item
 *   An optional string containing the name of a form item that any errors
 *   will be attached to. Useful when the function validates a directory path
 *   entered as a form value. An error will consequently prevent form submit
 *   handlers from running, and instead display the form along with the
 *   error messages.
 *
 * @return
 *   FALSE if the directory does not exist or is not writable, even after
 *   any optional actions have been carried out. Otherwise, TRUE is returned.
 */
function file_check_directory(&$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' => $directory)));
            @chmod($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' => $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' => $directory)));
        }
        else {
            form_set_error($form_item, t('The directory %directory is not writable', array('%directory' => $directory)));
            watchdog('file system', 'The directory %directory is not writable, because it does not have the correct permissions set.', array('%directory' => $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 {
            $variables = array('%directory' => $directory, '!htaccess' => '<br />'. nl2br(check_plain($htaccess_lines)));
            form_set_error($form_item, 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>", $variables));
            watchdog('security', "Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>!htaccess</code>", $variables, 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 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
 *   Either a string specifying the file location of the original file or an
 *   object containing a 'filepath' property. This parameter is passed by
 *   reference and 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' => $source, '%directory' => $dest)), 'error');
        watchdog('file system', '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' => $source, '%directory' => $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' => $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 (!$dest = file_destination($dest, $replace)) {
            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' => $source)), 'error');
            return FALSE;
        }

        if (!@copy($source, $dest)) {
            drupal_set_message(t('The selected file %file could not be copied.', array('%file' => $source)), 'error');
            return 0;
        }

        // Give everyone read access so that FTP'd users or
        // non-webserver users can see/read these files,
        // and give group write permissions so group members
        // can alter files uploaded by the webserver.
        @chmod($dest, 0664);
    }

    if (isset($file) && is_object($file)) {
        $file->filename = $basename;
        $file->filepath = $dest;
        $source = $file;
    }
    else {
        $source = $dest;
    }

    return 1; // Everything went ok.
}

/**
 * Determines the destination path for a file depending on how replacement of
 * existing files should be handled.
 *
 * @param $destination A string specifying the desired path.
 * @param $replace Replace behavior when the destination file already exists.
 *   - FILE_EXISTS_REPLACE - Replace the existing file
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *     unique
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 * @return The destination file path or FALSE if the file already exists and
 *   FILE_EXISTS_ERROR was specified.
 */
function file_destination($destination, $replace) {
    if (file_exists($destination)) {
        switch ($replace) {
            case FILE_EXISTS_RENAME:
                $basename = basename($destination);
                $directory = dirname($destination);
                $destination = file_create_filename($basename, $directory);
                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' => $destination)), 'error');
                return FALSE;
        }
    }
    return $destination;
}

/**
 * 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
 *   Either a string specifying the file location of the original file or an
 *   object containing a 'filepath' property. This parameter is passed by
 *   reference and 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' => $path_original)), 'error');
    }
    return 0;
}

/**
 * Modify a filename as needed for security purposes.
 *
 * Munging a file name prevents unknown file extensions from masking exploit
 * files. When web servers such as Apache decide how to process a URL request,
 * they use the file extension. If the extension is not recognized, Apache
 * skips that extension and uses the previous file extension. For example, if
 * the file being requested is exploit.php.pps, and Apache does not recognize
 * the '.pps' extension, it treats the file as PHP and executes it. To make
 * this file name safe for Apache and prevent it from executing as PHP, the
 * .php extension is "munged" into .php_, making the safe file name
 * exploit.php_.pps.
 *
 * Specifically, this function adds an underscore to all extensions that are
 * between 2 and 5 characters in length, internal to the file name, and not
 * included in $extensions.
 *
 * Function behavior is also controlled by the Drupal variable
 * 'allow_insecure_uploads'. If 'allow_insecure_uploads' evaluates to TRUE, no
 * alterations will be made, if it evaluates to FALSE, the filename is 'munged'.
 *
 * @param $filename
 *   File name to modify.
 * @param $extensions
 *   A space-separated list of extensions that should not be altered.
 * @param $alerts
 *   If TRUE, drupal_set_message() will be called to display a message if the
 *   file name was changed.
 *
 * @return
 *   The potentially modified $filename.
 */
function file_munge_filename($filename, $extensions, $alerts = TRUE) {
    $original = $filename;

    // Allow potentially insecure uploads for very savvy users and admin
    if (!variable_get('allow_insecure_uploads', 0)) {
        $whitelist = array_unique(explode(' ', trim($extensions)));

        // Split the filename up by periods. The first part becomes the basename
        // the last part the final extension.
        $filename_parts = explode('.', $filename);
        $new_filename = array_shift($filename_parts); // Remove file basename.
        $final_extension = array_pop($filename_parts); // Remove final extension.

        // Loop through the middle parts of the name and add an underscore to the
        // end of each section that could be a file extension but isn't in the list
        // of allowed extensions.
        foreach ($filename_parts as $filename_part) {
            $new_filename .= '.'. $filename_part;
            if (!in_array($filename_part, $whitelist) && preg_match("/^[a-zA-Z]{2,5}\d?$/", $filename_part)) {
                $new_filename .= '_';
            }
        }
        $filename = $new_filename .'.'. $final_extension;

        if ($alerts && $original != $filename) {
            drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $filename)));
        }
    }

    return $filename;
}

/**
 * Undo the effect of upload_munge_filename().
 *
 * @param $filename string filename
 * @return string
 */
function file_unmunge_filename($filename) {
    return str_replace('_.', '.', $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.
 *
 * @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;
            $ext = '';
        }

        $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);
    }
}

/**
 * Determine total disk space used by a single user or the whole filesystem.
 *
 * @param $uid
 *   An optional user id. A NULL value returns the total space used
 *   by all files.
 */
function file_space_used($uid = NULL) {
    if (isset($uid)) {
        return (int) db_result(db_query('SELECT SUM(filesize) FROM {files} WHERE uid = %d', $uid));
    }
    return (int) db_result(db_query('SELECT SUM(filesize) FROM {files}'));
}

/**
 * Saves a file upload to a new location.
 *
 * The source file is validated as a proper upload and handled as such.
 * The file will be added to the files table as a temporary file. Temporary
 * files are periodically cleaned. To make the file permanent file call
 * file_set_status() to change its status.
 *
 * @param $source
 *   A string specifying the name of the upload field to save.
 * @param $validators
 *   (optional) An associative array of callback functions used to validate the
 *   file. The keys are function names and the values arrays of callback
 *   parameters which will be passed in after the file object. The
 *   functions should return an array of error messages; an empty array
 *   indicates that the file passed validation. The functions will be called in
 *   the order specified.
 * @param $dest
 *   A string containing the directory $source should be copied to. If this is
 *   not provided or is not writable, the temporary directory will be used.
 * @param $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE: Replace the existing file.
 *   - FILE_EXISTS_RENAME: Append _{incrementing number} until the filename
 *     is unique.
 *   - FILE_EXISTS_ERROR: Do nothing and return FALSE.
 *
 * @return
 *   An object containing the file information, or 0 in the event of an error.
 */
function file_save_upload($source, $validators = array(), $dest = FALSE, $replace = FILE_EXISTS_RENAME) {
    global $user;
    static $upload_cache;

    // Add in our check of the the file name length.
    $validators['file_validate_name_length'] = array();

    // 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 (isset($_FILES['files']) && $_FILES['files']['name'][$source] && is_uploaded_file($_FILES['files']['tmp_name'][$source])) {
        // Check for file upload errors and return FALSE if a
        // lower level system error occurred.
        switch ($_FILES['files']['error'][$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 %maxsize, the maximum allowed size for uploads.', array('%file' => $source, '%maxsize' => format_size(file_upload_max_size()))), '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' => $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' => $source)), 'error');
                return 0;
        }

        // Build the list of non-munged extensions.
        // @todo: this should not be here. we need to figure out the right place.
        $extensions = '';
        foreach ($user->roles as $rid => $name) {
            $extensions .= ' '. variable_get("upload_extensions_$rid",
                    variable_get('upload_extensions_default', 'jpg jpeg gif png txt html doc xls pdf ppt pps odt ods odp'));
        }

        // Begin building file object.
        $file = new stdClass();
        $file->filename = file_munge_filename(trim(basename($_FILES['files']['name'][$source]), '.'), $extensions);





        $file->filepath = $_FILES['files']['tmp_name'][$source];
        $file->filemime = file_get_mimetype($file->filename);

        // If the destination is not provided, or is not writable, then use the
        // temporary directory.
        if (empty($dest) || file_check_path($dest) === FALSE) {
            $dest = file_directory_temp();
        }

        $file->source = $source;
        $file->destination = file_destination(file_create_path($dest .'/'. $file->filename), $replace);
        $file->filesize = $_FILES['files']['size'][$source];

        // Call the validation functions.
        $errors = array();
        foreach ($validators as $function => $args) {
            array_unshift($args, $file);
            // Make sure $file is passed around by reference.
            $args[0] = &$file;
            $errors = array_merge($errors, call_user_func_array($function, $args));
        }

        // Rename potentially executable files, to help prevent exploits.
        if (preg_match('/\.(php|pl|py|cgi|asp|js)$/i', $file->filename) && (substr($file->filename, -4) != '.txt')) {
            $file->filemime = 'text/plain';
            $file->filepath .= '.txt';
            $file->filename .= '.txt';
            // As the file may be named example.php.txt, we need to munge again to
            // convert to example.php_.txt, then create the correct destination.
            $file->filename = file_munge_filename($file->filename, $extensions);

            $file->destination = file_destination(file_create_path($dest .'/'. $file->filename), $replace);
        }


        // Check for validation errors.
        if (!empty($errors)) {
            $message = t('The selected file %name could not be uploaded.', array('%name' => $file->filename));
            if (count($errors) > 1) {
                $message .= '<ul><li>'. implode('</li><li>', $errors) .'</li></ul>';
            }
            else {
                $message .= ' '. array_pop($errors);
            }
            form_set_error($source, $message);
            return 0;
        }

        //为什么ie是好的,,google不行 非要用这种方法

        //把utf-8 转成 gbk  这种方法不行  不知什么原因 
        //$file->filename =     mb_convert_encoding($file->filename, "GBK", "UTF-8");
        $prefix = $user->uid.'_'.date('YmdHis').'_'.md5(uniqid(rand(), true));
        $suffix = strrchr($file->filename,'.');
        $file->filename = $prefix.$suffix;


        $file->destination = file_destination(file_create_path($dest .'/'. $file->filename), $replace);
        //      var_dump($file->filepath);exit;
        // Move uploaded files from PHP's upload_tmp_dir to Drupal's temporary directory.
        // This overcomes open_basedir restrictions for future file operations.
        $file->filepath = $file->destination;


        //这里是给它加上个年月的文件夹    
        //$direct= dirname($file->filepath).'/'.date('Y').'/'.date('m');
        //假如没有这个目录 就创建它
        //_MkdirAll($_SERVER['DOCUMENT_ROOT'].'/'.$direct);    
        //$file->filepath = $direct.'/'.basename($file->filepath);



        if (!move_uploaded_file($_FILES['files']['tmp_name'][$source], $file->filepath)) {
            form_set_error($source, t('File upload error. Could not move uploaded file.'));
            watchdog('file', 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->filepath));
            return 0;
        }

        // If we made it this far it's safe to record this file in the database.
        $file->uid = $user->uid;
        $file->status = FILE_STATUS_TEMPORARY;
        $file->timestamp = time();

        drupal_write_record('files', $file);

        // Add file to the cache.
        $upload_cache[$source] = $file;
        return $file;
    }
    return 0;
}

/**
 * Check for files with names longer than we can store in the database.
 *
 * @param $file
 *   A Drupal file object.
 * @return
 *   An array. If the file name is too long, it will contain an error message.
 */
function file_validate_name_length($file) {
    $errors = array();

    if (strlen($file->filename) > 255) {
        $errors[] = t('Its name exceeds the 255 characters limit. Please rename the file and try again.');
    }
    return $errors;
}

/**
 * Check that the filename ends with an allowed extension. This check is not
 * enforced for the user #1.
 *
 * @param $file
 *   A Drupal file object.
 * @param $extensions
 *   A string with a space separated list of allowed file extensions, not
 *   including the period. For example, 'bmp jpg gif png'.
 *
 * @return
 *   An array. If the file extension is not allowed, it will contain an error
 *   message.
 */
function file_validate_extensions($file, $extensions) {
    global $user;

    $errors = array();

    // Bypass validation for uid  = 1.
    if ($user->uid != 1) {
        $regex = '/\.('. @ereg_replace(' +', '|', preg_quote($extensions)) .')$/i';
        if (!preg_match($regex, $file->filename)) {
            $errors[] = t('Only files with the following extensions are allowed: %files-allowed.', array('%files-allowed' => $extensions));
        }
    }
    return $errors;
}

/**
 * Check that the file's size is below certain limits. This check is not
 * enforced for the user #1.
 *
 * @param $file
 *   A Drupal file object.
 * @param $file_limit
 *   An integer specifying the maximum file size in bytes. Zero indicates that
 *   no limit should be enforced.
 * @param $user_limit
 *   An integer specifying the maximum number of bytes the user is allowed. Zero
 *   indicates that no limit should be enforced.
 * @return
 *   An array. If the file size exceeds limits, it will contain an error message.
 */
function file_validate_size($file, $file_limit = 0, $user_limit = 0) {
    global $user;

    $errors = array();

    // Bypass validation for uid  = 1.
    if ($user->uid != 1) {
        if ($file_limit && $file->filesize > $file_limit) {
            $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->filesize), '%maxsize' => format_size($file_limit)));
        }

        // Save a query by only calling file_space_used() when a limit is provided.
        if ($user_limit && (file_space_used($user->uid) + $file->filesize) > $user_limit) {
            $errors[] = t('The file is %filesize which would exceed your disk quota of %quota.', array('%filesize' => format_size($file->filesize), '%quota' => format_size($user_limit)));
        }
    }
    return $errors;
}

/**
 * Check that the file is recognized by image_get_info() as an image.
 *
 * @param $file
 *   A Drupal file object.
 * @return
 *   An array. If the file is not an image, it will contain an error message.
 */
function file_validate_is_image(&$file) {
    $errors = array();

    $info = image_get_info($file->filepath);
    if (!$info || empty($info['extension'])) {
        $errors[] = t('Only JPEG, PNG and GIF images are allowed.');
    }

    return $errors;
}

/**
 * If the file is an image verify that its dimensions are within the specified
 * maximum and minimum dimensions. Non-image files will be ignored.
 *
 * @param $file
 *   A Drupal file object. This function may resize the file affecting its size.
 * @param $maximum_dimensions
 *   An optional string in the form WIDTHxHEIGHT e.g. '640x480' or '85x85'. If
 *   an image toolkit is installed the image will be resized down to these
 *   dimensions. A value of 0 indicates no restriction on size, so resizing
 *   will be attempted.
 * @param $minimum_dimensions
 *   An optional string in the form WIDTHxHEIGHT. This will check that the image
 *   meets a minimum size. A value of 0 indicates no restriction.
 * @return
 *   An array. If the file is an image and did not meet the requirements, it
 *   will contain an error message.
 */
function file_validate_image_resolution(&$file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
    $errors = array();

    // Check first that the file is an image.
    if ($info = image_get_info($file->filepath)) {
        if ($maximum_dimensions) {
            // Check that it is smaller than the given dimensions.
            list($width, $height) = explode('x', $maximum_dimensions);
            if ($info['width'] > $width || $info['height'] > $height) {
                // Try to resize the image to fit the dimensions.
                if (image_get_toolkit() && image_scale($file->filepath, $file->filepath, $width, $height)) {
                    drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));

                    // Clear the cached filesize and refresh the image information.
                    clearstatcache();
                    $info = image_get_info($file->filepath);
                    $file->filesize = $info['file_size'];
                }
                else {
                    $errors[] = t('The image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => $maximum_dimensions));
                }
            }
        }

        if ($minimum_dimensions) {
            // Check that it is larger than the given dimensions.
            list($width, $height) = explode('x', $minimum_dimensions);
            if ($info['width'] < $width || $info['height'] < $height) {
                $errors[] = t('The image is too small; the minimum dimensions are %dimensions pixels.', array('%dimensions' => $minimum_dimensions));
            }
        }
    }

    return $errors;
}

/**
 * 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();
    // On Windows, tempnam() requires an absolute path, so we use realpath().
    $file = tempnam(realpath($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;
}

/**
 * Set the status of a file.
 *
 * @param $file
 *   A Drupal file object.
 * @param $status
 *   A status value to set the file to. One of:
 *   - FILE_STATUS_PERMANENT
 *   - FILE_STATUS_TEMPORARY
 *
 * @return FALSE on failure, TRUE on success and $file->status will contain the
 *     status.
 */
function file_set_status(&$file, $status) {
    if (db_query('UPDATE {files} SET status = %d WHERE fid = %d', $status, $file->fid)) {
        $file->status = $status;
        return TRUE;
    }
    return FALSE;
}

/**
 * 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) {
    if (ob_get_level()) {
        ob_end_clean();
    }

    // IE cannot download private files because it cannot store files downloaded
    // over https in the browser cache. The problem can be solved by sending
    // custom headers to IE. See http://support.microsoft.com/kb/323308/en-us
    if (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on')) {
        drupal_set_header('Cache-Control: private');
        drupal_set_header('Pragma: private');
    }

    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| )/', '', $header);
        drupal_set_header($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; this
 * prevents hidden files and directories (such as SVN working directories)
 * from being scanned.
 *
 * @param $dir
 *   The base directory for the scan, without trailing slash.
 * @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 associative 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 the
 *   extension.
 * @param $min_depth
 *   Minimum depth of directories to return files from.
 * @param $depth
 *   Current depth of recursion. This parameter is only used internally and
 *   should not be passed in.
 *
 * @return
 *   An associative array (keyed on the provided key) of objects with
 *   "filename", "basename", and "name" members corresponding to the
 *   matching files.
 */
function file_scan_directory($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 (FALSE !== ($file = readdir($handle))) {
            if (!in_array($file, $nomask) && $file[0] != '.') {
                if (is_dir("$dir/$file") && $recurse) {
                    // Give priority to files in this folder by merging them in after any subdirectory files.
                    $files = array_merge(file_scan_directory("$dir/$file", $mask, $nomask, $callback, $recurse, $key, $min_depth, $depth + 1), $files);
                }
                elseif ($depth >= $min_depth && @ereg($mask, $file)) {
                    // Always use this match over anything already set in $files with the same $$key.
                    $filename = "$dir/$file";
                    $basename = basename($file);
                    $name = substr($basename, 0, strrpos($basename, '.'));
                    $files[$$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', conf_path() .'/files');
}

/**
 * Determine the maximum file upload size by querying the PHP settings.
 *
 * @return
 *   A file size limit in bytes 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 = parse_size(ini_get('upload_max_filesize'));
        $post_max = parse_size(ini_get('post_max_size'));
        $max_size = ($upload_max < $post_max) ? $upload_max : $post_max;
    }
    return $max_size;
}

/**
 * Determine an Internet Media Type, or MIME type from a filename.
 *
 * @param $filename
 *   Name of the file, including extension.
 * @param $mapping
 *   An optional array of extension to media type mappings in the form
 *   'extension1|extension2|...' => 'type'.
 *
 * @return
 *   The internet media type registered for the extension or application/octet-stream for unknown extensions.
 */
function file_get_mimetype($filename, $mapping = NULL) {
    if (!is_array($mapping)) {
        $mapping = variable_get('mime_extension_mapping', array(
            'ez' => 'application/andrew-inset',
            'atom' => 'application/atom',
            'atomcat' => 'application/atomcat+xml',
            'atomsrv' => 'application/atomserv+xml',
            'cap|pcap' => 'application/cap',
            'cu' => 'application/cu-seeme',
            'tsp' => 'application/dsptype',
            'spl' => 'application/x-futuresplash',
            'hta' => 'application/hta',
            'jar' => 'application/java-archive',
            'ser' => 'application/java-serialized-object',
            'class' => 'application/java-vm',
            'hqx' => 'application/mac-binhex40',
            'cpt' => 'image/x-corelphotopaint',
            'nb' => 'application/mathematica',
            'mdb' => 'application/msaccess',
            'doc|dot' => 'application/msword',
            'bin' => 'application/octet-stream',
            'oda' => 'application/oda',
            'ogg|ogx' => 'application/ogg',
            'pdf' => 'application/pdf',
            'key' => 'application/pgp-keys',
            'pgp' => 'application/pgp-signature',
            'prf' => 'application/pics-rules',
            'ps|ai|eps' => 'application/postscript',
            'rar' => 'application/rar',
            'rdf' => 'application/rdf+xml',
            'rss' => 'application/rss+xml',
            'rtf' => 'application/rtf',
            'smi|smil' => 'application/smil',
            'wpd' => 'application/wordperfect',
            'wp5' => 'application/wordperfect5.1',
            'xhtml|xht' => 'application/xhtml+xml',
            'xml|xsl' => 'application/xml',
            'zip' => 'application/zip',
            'cdy' => 'application/vnd.cinderella',
            'kml' => 'application/vnd.google-earth.kml+xml',
            'kmz' => 'application/vnd.google-earth.kmz',
            'xul' => 'application/vnd.mozilla.xul+xml',
            'xls|xlb|xlt' => 'application/vnd.ms-excel',
            'cat' => 'application/vnd.ms-pki.seccat',
            'stl' => 'application/vnd.ms-pki.stl',
            'ppt|pps' => 'application/vnd.ms-powerpoint',
            'odc' => 'application/vnd.oasis.opendocument.chart',
            'odb' => 'application/vnd.oasis.opendocument.database',
            'odf' => 'application/vnd.oasis.opendocument.formula',
            'odg' => 'application/vnd.oasis.opendocument.graphics',
            'otg' => 'application/vnd.oasis.opendocument.graphics-template',
            'odi' => 'application/vnd.oasis.opendocument.image',
            'odp' => 'application/vnd.oasis.opendocument.presentation',
            'otp' => 'application/vnd.oasis.opendocument.presentation-template',
            'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
            'ots' => 'application/vnd.oasis.opendocument.spreadsheet-template',
            'odt' => 'application/vnd.oasis.opendocument.text',
            'odm' => 'application/vnd.oasis.opendocument.text-master',
            'ott' => 'application/vnd.oasis.opendocument.text-template',
            'oth' => 'application/vnd.oasis.opendocument.text-web',
            'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
            'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
            'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
            'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
            'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
            'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
            'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
            'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
            'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
            'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
            'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
            'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
            'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
            'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
            'cod' => 'application/vnd.rim.cod',
            'mmf' => 'application/vnd.smaf',
            'sdc' => 'application/vnd.stardivision.calc',
            'sds' => 'application/vnd.stardivision.chart',
            'sda' => 'application/vnd.stardivision.draw',
            'sdd' => 'application/vnd.stardivision.impress',
            'sdf' => 'application/vnd.stardivision.math',
            'sdw' => 'application/vnd.stardivision.writer',
            'sgl' => 'application/vnd.stardivision.writer-global',
            'sxc' => 'application/vnd.sun.xml.calc',
            'stc' => 'application/vnd.sun.xml.calc.template',
            'sxd' => 'application/vnd.sun.xml.draw',
            'std' => 'application/vnd.sun.xml.draw.template',
            'sxi' => 'application/vnd.sun.xml.impress',
            'sti' => 'application/vnd.sun.xml.impress.template',
            'sxm' => 'application/vnd.sun.xml.math',
            'sxw' => 'application/vnd.sun.xml.writer',
            'sxg' => 'application/vnd.sun.xml.writer.global',
            'stw' => 'application/vnd.sun.xml.writer.template',
            'sis' => 'application/vnd.symbian.install',
            'vsd' => 'application/vnd.visio',
            'wbxml' => 'application/vnd.wap.wbxml',
            'wmlc' => 'application/vnd.wap.wmlc',
            'wmlsc' => 'application/vnd.wap.wmlscriptc',
            'wk' => 'application/x-123',
            '7z' => 'application/x-7z-compressed',
            'abw' => 'application/x-abiword',
            'dmg' => 'application/x-apple-diskimage',
            'bcpio' => 'application/x-bcpio',
            'torrent' => 'application/x-bittorrent',
            'cab' => 'application/x-cab',
            'cbr' => 'application/x-cbr',
            'cbz' => 'application/x-cbz',
            'cdf' => 'application/x-cdf',
            'vcd' => 'application/x-cdlink',
            'pgn' => 'application/x-chess-pgn',
            'cpio' => 'application/x-cpio',
            'csh' => 'text/x-csh',
            'deb|udeb' => 'application/x-debian-package',
            'dcr|dir|dxr' => 'application/x-director',
            'dms' => 'application/x-dms',
            'wad' => 'application/x-doom',
            'dvi' => 'application/x-dvi',
            'rhtml' => 'application/x-httpd-eruby',
            'flac' => 'application/x-flac',
            'pfa|pfb|gsf|pcf|pcf.Z' => 'application/x-font',
            'mm' => 'application/x-freemind',
            'gnumeric' => 'application/x-gnumeric',
            'sgf' => 'application/x-go-sgf',
            'gcf' => 'application/x-graphing-calculator',
            'gtar|tgz|taz' => 'application/x-gtar',
            'hdf' => 'application/x-hdf',
            'phtml|pht|php' => 'application/x-httpd-php',
            'phps' => 'application/x-httpd-php-source',
            'php3' => 'application/x-httpd-php3',
            'php3p' => 'application/x-httpd-php3-preprocessed',
            'php4' => 'application/x-httpd-php4',
            'ica' => 'application/x-ica',
            'ins|isp' => 'application/x-internet-signup',
            'iii' => 'application/x-iphone',
            'iso' => 'application/x-iso9660-image',
            'jnlp' => 'application/x-java-jnlp-file',
            'js' => 'application/x-javascript',
            'jmz' => 'application/x-jmol',
            'chrt' => 'application/x-kchart',
            'kil' => 'application/x-killustrator',
            'skp|skd|skt|skm' => 'application/x-koan',
            'kpr|kpt' => 'application/x-kpresenter',
            'ksp' => 'application/x-kspread',
            'kwd|kwt' => 'application/x-kword',
            'latex' => 'application/x-latex',
            'lha' => 'application/x-lha',
            'lyx' => 'application/x-lyx',
            'lzh' => 'application/x-lzh',
            'lzx' => 'application/x-lzx',
            'frm|maker|frame|fm|fb|book|fbdoc' => 'application/x-maker',
            'mif' => 'application/x-mif',
            'wmd' => 'application/x-ms-wmd',
            'wmz' => 'application/x-ms-wmz',
            'com|exe|bat|dll' => 'application/x-msdos-program',
            'msi' => 'application/x-msi',
            'nc' => 'application/x-netcdf',
            'pac' => 'application/x-ns-proxy-autoconfig',
            'nwc' => 'application/x-nwc',
            'o' => 'application/x-object',
            'oza' => 'application/x-oz-application',
            'p7r' => 'application/x-pkcs7-certreqresp',
            'crl' => 'application/x-pkcs7-crl',
            'pyc|pyo' => 'application/x-python-code',
            'qtl' => 'application/x-quicktimeplayer',
            'rpm' => 'application/x-redhat-package-manager',
            'sh' => 'text/x-sh',
            'shar' => 'application/x-shar',
            'swf|swfl' => 'application/x-shockwave-flash',
            'sit|sitx' => 'application/x-stuffit',
            'sv4cpio' => 'application/x-sv4cpio',
            'sv4crc' => 'application/x-sv4crc',
            'tar' => 'application/x-tar',
            'tcl' => 'application/x-tcl',
            'gf' => 'application/x-tex-gf',
            'pk' => 'application/x-tex-pk',
            'texinfo|texi' => 'application/x-texinfo',
            '~|%|bak|old|sik' => 'application/x-trash',
            't|tr|roff' => 'application/x-troff',
            'man' => 'application/x-troff-man',
            'me' => 'application/x-troff-me',
            'ms' => 'application/x-troff-ms',
            'ustar' => 'application/x-ustar',
            'src' => 'application/x-wais-source',
            'wz' => 'application/x-wingz',
            'crt' => 'application/x-x509-ca-cert',
            'xcf' => 'application/x-xcf',
            'fig' => 'application/x-xfig',
            'xpi' => 'application/x-xpinstall',
            'au|snd' => 'audio/basic',
            'mid|midi|kar' => 'audio/midi',
            'mpga|mpega|mp2|mp3|m4a' => 'audio/mpeg',
            'f4a|f4b' => 'audio/mp4',
            'm3u' => 'audio/x-mpegurl',
            'oga|spx' => 'audio/ogg',
            'sid' => 'audio/prs.sid',
            'aif|aiff|aifc' => 'audio/x-aiff',
            'gsm' => 'audio/x-gsm',
            'wma' => 'audio/x-ms-wma',
            'wax' => 'audio/x-ms-wax',
            'ra|rm|ram' => 'audio/x-pn-realaudio',
            'ra' => 'audio/x-realaudio',
            'pls' => 'audio/x-scpls',
            'sd2' => 'audio/x-sd2',
            'wav' => 'audio/x-wav',
            'alc' => 'chemical/x-alchemy',
            'cac|cache' => 'chemical/x-cache',
            'csf' => 'chemical/x-cache-csf',
            'cbin|cascii|ctab' => 'chemical/x-cactvs-binary',
            'cdx' => 'chemical/x-cdx',
            'cer' => 'chemical/x-cerius',
            'c3d' => 'chemical/x-chem3d',
            'chm' => 'chemical/x-chemdraw',
            'cif' => 'chemical/x-cif',
            'cmdf' => 'chemical/x-cmdf',
            'cml' => 'chemical/x-cml',
            'cpa' => 'chemical/x-compass',
            'bsd' => 'chemical/x-crossfire',
            'csml|csm' => 'chemical/x-csml',
            'ctx' => 'chemical/x-ctx',
            'cxf|cef' => 'chemical/x-cxf',
            'emb|embl' => 'chemical/x-embl-dl-nucleotide',
            'spc' => 'chemical/x-galactic-spc',
            'inp|gam|gamin' => 'chemical/x-gamess-input',
            'fch|fchk' => 'chemical/x-gaussian-checkpoint',
            'cub' => 'chemical/x-gaussian-cube',
            'gau|gjc|gjf' => 'chemical/x-gaussian-input',
            'gal' => 'chemical/x-gaussian-log',
            'gcg' => 'chemical/x-gcg8-sequence',
            'gen' => 'chemical/x-genbank',
            'hin' => 'chemical/x-hin',
            'istr|ist' => 'chemical/x-isostar',
            'jdx|dx' => 'chemical/x-jcamp-dx',
            'kin' => 'chemical/x-kinemage',
            'mcm' => 'chemical/x-macmolecule',
            'mmd|mmod' => 'chemical/x-macromodel-input',
            'mol' => 'chemical/x-mdl-molfile',
            'rd' => 'chemical/x-mdl-rdfile',
            'rxn' => 'chemical/x-mdl-rxnfile',
            'sd|sdf' => 'chemical/x-mdl-sdfile',
            'tgf' => 'chemical/x-mdl-tgf',
            'mcif' => 'chemical/x-mmcif',
            'mol2' => 'chemical/x-mol2',
            'b' => 'chemical/x-molconn-Z',
            'gpt' => 'chemical/x-mopac-graph',
            'mop|mopcrt|mpc|dat|zmt' => 'chemical/x-mopac-input',
            'moo' => 'chemical/x-mopac-out',
            'mvb' => 'chemical/x-mopac-vib',
            'asn' => 'chemical/x-ncbi-asn1-spec',
            'prt|ent' => 'chemical/x-ncbi-asn1-ascii',
            'val|aso' => 'chemical/x-ncbi-asn1-binary',
            'pdb|ent' => 'chemical/x-pdb',
            'ros' => 'chemical/x-rosdal',
            'sw' => 'chemical/x-swissprot',
            'vms' => 'chemical/x-vamas-iso14976',
            'vmd' => 'chemical/x-vmd',
            'xtel' => 'chemical/x-xtel',
            'xyz' => 'chemical/x-xyz',
            'gif' => 'image/gif',
            'ief' => 'image/ief',
            'jpeg|jpg|jpe' => 'image/jpeg',
            'pcx' => 'image/pcx',
            'png' => 'image/png',
            'svg|svgz' => 'image/svg+xml',
            'tiff|tif' => 'image/tiff',
            'djvu|djv' => 'image/vnd.djvu',
            'wbmp' => 'image/vnd.wap.wbmp',
            'ras' => 'image/x-cmu-raster',
            'cdr' => 'image/x-coreldraw',
            'pat' => 'image/x-coreldrawpattern',
            'cdt' => 'image/x-coreldrawtemplate',
            'ico' => 'image/x-icon',
            'art' => 'image/x-jg',
            'jng' => 'image/x-jng',
            'bmp' => 'image/x-ms-bmp',
            'psd' => 'image/x-photoshop',
            'pnm' => 'image/x-portable-anymap',
            'pbm' => 'image/x-portable-bitmap',
            'pgm' => 'image/x-portable-graymap',
            'ppm' => 'image/x-portable-pixmap',
            'rgb' => 'image/x-rgb',
            'xbm' => 'image/x-xbitmap',
            'xpm' => 'image/x-xpixmap',
            'xwd' => 'image/x-xwindowdump',
            'eml' => 'message/rfc822',
            'igs|iges' => 'model/iges',
            'msh|mesh|silo' => 'model/mesh',
            'wrl|vrml' => 'model/vrml',
            'ics|icz' => 'text/calendar',
            'css' => 'text/css',
            'csv' => 'text/csv',
            '323' => 'text/h323',
            'html|htm|shtml' => 'text/html',
            'uls' => 'text/iuls',
            'mml' => 'text/mathml',
            'asc|txt|text|pot' => 'text/plain',
            'rtx' => 'text/richtext',
            'sct|wsc' => 'text/scriptlet',
            'tm|ts' => 'text/texmacs',
            'tsv' => 'text/tab-separated-values',
            'jad' => 'text/vnd.sun.j2me.app-descriptor',
            'wml' => 'text/vnd.wap.wml',
            'wmls' => 'text/vnd.wap.wmlscript',
            'bib' => 'text/x-bibtex',
            'boo' => 'text/x-boo',
            'h++|hpp|hxx|hh' => 'text/x-c++hdr',
            'c++|cpp|cxx|cc' => 'text/x-c++src',
            'h' => 'text/x-chdr',
            'htc' => 'text/x-component',
            'c' => 'text/x-csrc',
            'd' => 'text/x-dsrc',
            'diff|patch' => 'text/x-diff',
            'hs' => 'text/x-haskell',
            'java' => 'text/x-java',
            'lhs' => 'text/x-literate-haskell',
            'moc' => 'text/x-moc',
            'p|pas' => 'text/x-pascal',
            'gcd' => 'text/x-pcs-gcd',
            'pl|pm' => 'text/x-perl',
            'py' => 'text/x-python',
            'etx' => 'text/x-setext',
            'tcl|tk' => 'text/x-tcl',
            'tex|ltx|sty|cls' => 'text/x-tex',
            'vcs' => 'text/x-vcalendar',
            'vcf' => 'text/x-vcard',
            '3gp' => 'video/3gpp',
            'dl' => 'video/dl',
            'dif|dv' => 'video/dv',
            'fli' => 'video/fli',
            'gl' => 'video/gl',
            'mpeg|mpg|mpe' => 'video/mpeg',
            'mp4|f4v|f4p' => 'video/mp4',
            'flv' => 'video/x-flv',
            'ogv' => 'video/ogg',
            'qt|mov' => 'video/quicktime',
            'mxu' => 'video/vnd.mpegurl',
            'lsf|lsx' => 'video/x-la-asf',
            'mng' => 'video/x-mng',
            'asf|asx' => 'video/x-ms-asf',
            'wm' => 'video/x-ms-wm',
            'wmv' => 'video/x-ms-wmv',
            'wmx' => 'video/x-ms-wmx',
            'wvx' => 'video/x-ms-wvx',
            'avi' => 'video/x-msvideo',
            'movie' => 'video/x-sgi-movie',
            'ice' => 'x-conference/x-cooltalk',
            'sisx' => 'x-epoc/x-sisx-app',
            'vrm|vrml|wrl' => 'x-world/x-vrml',
            'xps' => 'application/vnd.ms-xpsdocument',
        ));
    }
    foreach ($mapping as $ext_preg => $mime_match) {
        if (preg_match('!\.('. $ext_preg .')$!i', $filename)) {
            return $mime_match;
        }
    }

    return 'application/octet-stream';
}

//这里是创建子目录
function _MkdirAll($truepath)
{
    if(!file_exists($truepath))
    {
        //$truepath = $truepath.'bbbbbbbbb';
        //mkdir($truepath, $cfg_dir_purview);
        //chmod($truepath, $cfg_dir_purview);
        mkdir($truepath, '511',true);
        //var_dump($truepath);
        chmod($truepath, '511');//这里设置权限
        return true;
    }
    else
    {
        return true;
    }

}

/**
 * @} End of "defgroup file".
 */

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