/**
* Multi-Upload
*
* Extends CodeIgniters native Upload class to add support for multiple
* uploads.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Uploads
*/
class MY_Upload extends CI_Upload {

/**
* Properties
*/
protected $_multi_upload_data = array();
protected $_multi_file_name_override = "";

/**
* Initialize preferences
*
* @access public
* @param array
* @return void
*/
public function initialize($config = array()){
//Upload default settings.
$defaults = array(
"max_size" => 0,
?????????"max_width"???=> 0,
?????????"max_height"??=> 0,
?????????"max_filename"??=> 0,
?????????"allowed_types"??=> "",
?????????"file_temp"???=> "",
?????????"file_name"???=> "",
?????????"orig_name"???=> "",
?????????"file_type"???=> "",
?????????"file_size"???=> "",
?????????"file_ext"???=> "",
?????????"upload_path"??=> "",
?????????"overwrite"???=> FALSE,
?????????"encrypt_name"??=> FALSE,
?????????"is_image"???=> FALSE,
?????????"image_width"??=> "",
?????????"image_height"??=> "",
?????????"image_type"??=> "",
?????????"image_size_str"?=> "",
?????????"error_msg"???=> array(),
?????????"mimes"????=> array(),
?????????"remove_spaces"??=> TRUE,
?????????"xss_clean"???=> FALSE,
?????????"temp_prefix"??=> "temp_file_",
?????????"client_name"??=> ""
????????);

?????//Set each configuration.
?????foreach($defaults as $key => $val){
??????if(isset($config[$key])){
???????$method = "set_{$key}";
???????if(method_exists($this, $method)){
????????$this->$method($config[$key]);
???????} else {
????????$this->$key = $config[$key];
???????}
??????} else {
???????$this->$key = $val;
??????}
?????}

?????//Check if file_name was provided.
?????if(!empty($this->file_name)){
??????//Multiple file upload.
??????if(is_array($this->file_name)){
???????//Clear file name override.
???????$this->_file_name_override = "";

???????//Set multiple file name override.
???????$this->_multi_file_name_override = $this->file_name;
??????//Single file upload.
??????} else {
???????//Set file name override.
???????$this->_file_name_override = $this->file_name;

???????//Clear multiple file name override.
???????$this->_multi_file_name_override = "";
??????}
?????}
????}

???/**
??? * File MIME Type
??? *
??? * Detects the (actual) MIME type of the uploaded file, if possible.
??? * The input array is expected to be $_FILES[$field].
??? *
??? * In the case of multiple uploads, a optional second argument may be
??? * passed specifying which array element of the $_FILES[$field] array
??? * elements should be referenced (name, type, tmp_name, etc).
??? *
??? * @access?protected
??? * @param?$file?array
??? * @param?$count?int
??? * @return?void
??? */
????protected function _file_mime_type($file, $count=0){
?????//Mutliple file?
?????if(is_array($file["name"])){
??????$tmp_name = $file["tmp_name"][$count];
??????$type = $file["type"][$count];
?????//Single file.
?????} else {
??????$tmp_name = $file["tmp_name"];
??????$type = $file["type"];
?????}

?????//We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii).
?????$regexp = "/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/";

?????/* Fileinfo Extension - most reliable method.
????? *
????? * Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the
????? * more convenient FILEINFO_MIME_TYPE flag doesn't exist.
????? */
????? ?if(function_exists("finfo_file")){
????? ??$finfo = finfo_open(FILEINFO_MIME);
???????if(is_resource($finfo)){
????????$mime = @finfo_file($finfo, $tmp_name);
????????finfo_close($finfo);

????????/* According to the comments section of the PHP manual page,
???????? * it is possible that this function returns an empty string
???????? * for some files (e.g. if they don't exist in the magic MIME database).
???????? */
???????? ?if(is_string($mime) && preg_match($regexp, $mime, $matches)){
???????? ??$this->file_type = $matches[1];
??????????return;
???????? ?}
???????}
????? ?}

?????/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
????? * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
????? * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
????? * than mime_content_type() as well, hence the attempts to try calling the command line with
????? * three different functions.
????? *
????? * Notes:
????? *?- the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
????? *?- many system admins would disable the exec(), shell_exec(), popen() and similar functions
????? *?? due to security concerns, hence the function_exists() checks
????? */
????? ?if(DIRECTORY_SEPARATOR !== "\\"){
????? ??$cmd = "file --brief --mime ".escapeshellarg($tmp_name)." 2>&1";

???????if(function_exists("exec")){
????????/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.
???????? * However, we only neeed the last line, which is the actual return value of exec(), and as such - it overwrites
???????? * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy
???????? * value, which is only put to allow us to get the return status code.
???????? */
?????????$mime = @exec($cmd, $mime, $return_status);
?????????if($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)){
??????????$this->file_type = $matches[1];
??????????return;
?????????}
???????}
????? ?}

??????if((bool)@ini_get("safe_mode") === FALSE && function_exists("shell_exec")){
???????$mime = @shell_exec($cmd);
???????if(strlen($mime) > 0){
????????$mime = explode("\n", trim($mime));
????????if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){
?????????$this->file_type = $matches[1];
?????????return;
????????}
???????}
??????}

??????if(function_exists("popen")){
???????$proc = @popen($cmd, "r");
???????if(is_resource($proc)){
????????$mime = @fread($proc, 512);
????????@pclose($proc);
????????if($mime !== FALSE){
?????????$mime = explode("\n", trim($mime));
?????????if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){
??????????$this->file_type = $matches[1];
??????????return;
?????????}
????????}
???????}
??????}

??????//Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]["type"])
??????if(function_exists("mime_content_type")){
???????$this->file_type = @mime_content_type($tmp_name);
???????//It's possible that mime_content_type() returns FALSE or an empty string.
???????if(strlen($this->file_type) > 0){
????????return;
???????}
??????}

??????//If all else fails, use $_FILES default mime type.
??????$this->file_type = $type;
????}

???/**
??? * Set Multiple Upload Data
??? *
??? * @access?protected
??? * @return?void
??? */
????protected function set_multi_upload_data(){
?????$this->_multi_upload_data[] = array(
??????"file_name"???=> $this->file_name,
??????"file_type"???=> $this->file_type,
??????"file_path"???=> $this->upload_path,
??????"full_path"???=> $this->upload_path.$this->file_name,
??????"raw_name"???=> str_replace($this->file_ext, "", $this->file_name),
??????"orig_name"???=> $this->orig_name,
??????"client_name"??=> $this->client_name,
??????"file_ext"???=> $this->file_ext,
??????"file_size"???=> $this->file_size,
??????"is_image"???=> $this->is_image(),
??????"image_width"??=> $this->image_width,
??????"image_height"??=> $this->image_height,
??????"image_type"??=> $this->image_type,
??????"image_size_str"?=> $this->image_size_str
?????);
????}

???/**
??? * Get Multiple Upload Data
??? *
??? * @access?public
??? * @return?array
??? */
????public function get_multi_upload_data(){
?????return $this->_multi_upload_data;
????}

???/**
??? * Multile File Upload
??? *
??? * @access?public
??? * @param?string
??? * @return?mixed
??? */
????public function do_multi_upload($field){
?????//Is $_FILES[$field] set? If not, no reason to continue.
?????if(!isset($_FILES[$field])){ return false; }

?????//Is this really a multi upload?
?????if(!is_array($_FILES[$field]["name"])){
??????//Fallback to do_upload method.
??????return $this->do_upload($field);
?????}

?????//Is the upload path valid?
?????if(!$this->validate_upload_path()){
??????//Errors will already be set by validate_upload_path() so just return FALSE
??????return FALSE;
?????}

?????//Every file will have a separate entry in each of the $_FILES associative array elements (name, type, etc).
?????//Loop through $_FILES[$field]["name"] as representative of total number of files. Use count as key in
?????//corresponding elements of the $_FILES[$field] elements.
?????for($i=0; $i //Was the file able to be uploaded? If not, determine the reason why.
if(!is_uploaded_file($_FILES[$field]["tmp_name"][$i])){
//Determine error number.
$error = (!isset($_FILES[$field]["error"][$i])) ? 4 : $_FILES[$field]["error"][$i];

//Set error.
switch($error){
//UPLOAD_ERR_INI_SIZE
case 1:
$this->set_error("upload_file_exceeds_limit");
????????break;
????????//UPLOAD_ERR_FORM_SIZE
????????case 2:
?????????$this->set_error("upload_file_exceeds_form_limit");
????????break;
????????//UPLOAD_ERR_PARTIAL
????????case 3:
?????????$this->set_error("upload_file_partial");
????????break;
????????//UPLOAD_ERR_NO_FILE
????????case 4:
?????????$this->set_error("upload_no_file_selected");
????????break;
????????//UPLOAD_ERR_NO_TMP_DIR
????????case 6:
?????????$this->set_error("upload_no_temp_directory");
????????break;
????????//UPLOAD_ERR_CANT_WRITE
????????case 7:
?????????$this->set_error("upload_unable_to_write_file");
????????break;
????????//UPLOAD_ERR_EXTENSION
????????case 8:
?????????$this->set_error("upload_stopped_by_extension");
????????break;
????????default:
?????????$this->set_error("upload_no_file_selected");
????????break;
???????}

???????//Return failed upload.
???????return FALSE;
??????}

??????//Set current file data as class variables.
??????$this->file_temp?= $_FILES[$field]["tmp_name"][$i];
??????$this->file_size?= $_FILES[$field]["size"][$i];
??????$this->_file_mime_type($_FILES[$field], $i);
??????$this->file_type?= preg_replace("/^(.+?);.*$/", "\\1", $this->file_type);
??????$this->file_type?= strtolower(trim(stripslashes($this->file_type), '"'));
??????$this->file_name?= $this->_prep_filename($_FILES[$field]["name"][$i]);
??????$this->file_ext??= $this->get_extension($this->file_name);
??????$this->client_name?= $this->file_name;

??????//Is the file type allowed to be uploaded?
??????if(!$this->is_allowed_filetype()){
???????$this->set_error("upload_invalid_filetype");
???????return FALSE;
??????}

??????//If we're overriding, let's now make sure the new name and type is allowed.
??????//Check if a filename was supplied for the current file. Otherwise, use it's given name.
??????if(!empty($this->_multi_file_name_override[$i])){
???????$this->file_name = $this->_prep_filename($this->_multi_file_name_override[$i]);

???????//If no extension was provided in the file_name config item, use the uploaded one.
???????if(strpos($this->_multi_file_name_override[$i], ".") === FALSE){
????????$this->file_name .= $this->file_ext;
???????//An extension was provided, lets have it!
???????} else {
????????$this->file_ext = $this->get_extension($this->_multi_file_name_override[$i]);
???????}

???????if(!$this->is_allowed_filetype(TRUE)){
????????$this->set_error("upload_invalid_filetype");
????????return FALSE;
???????}
??????}

??????//Convert the file size to kilobytes.
??????if($this->file_size > 0){
???????$this->file_size = round($this->file_size/1024, 2);
??????}

??????//Is the file size within the allowed maximum?
??????if(!$this->is_allowed_filesize()){
???????$this->set_error("upload_invalid_filesize");
???????return FALSE;
??????}

??????//Are the image dimensions within the allowed size?
??????//Note: This can fail if the server has an open_basdir restriction.
??????if(!$this->is_allowed_dimensions()){
???????$this->set_error("upload_invalid_dimensions");
???????return FALSE;
??????}

??????//Sanitize the file name for security.
??????$this->file_name = $this->clean_file_name($this->file_name);

??????//Truncate the file name if it's too long
??????if($this->max_filename > 0){
???????$this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);
??????}

??????//Remove white spaces in the name
??????if($this->remove_spaces == TRUE){
???????$this->file_name = preg_replace("/\s+/", "_", $this->file_name);
??????}

??????/* Validate the file name
?????? * This function appends an number onto the end of
?????? * the file if one with the same name already exists.
?????? * If it returns false there was a problem.
?????? */
???????$this->orig_name = $this->file_name;
???????if($this->overwrite == FALSE){
????????$this->file_name = $this->set_filename($this->upload_path, $this->file_name);
????????if($this->file_name === FALSE){
?????????return FALSE;
????????}
???????}

/* XSS ハッキング フィルターを通してファイルを?qū)g行します
* これにより、悪意のあるコードがファイル內(nèi)に埋め込まれる
* ことを防ぎます。? スクリプトは、簡(jiǎn)単に畫(huà)像またはその他のファイルタイプとして偽裝できます。 */
if（$ this-＆gt; xss_clean）{
if（$ this-＆gt; do_xss_clean（）=== {
$ this-＆gt ;set_error("upload_unable_to_write_file");
return FALSE;
}
}

/* ファイルを最終的な宛先に移動(dòng)します

* 最初に copy() を使用してみます。? それが失敗した場(chǎng)合
* move_uploaded_file() を使用します。? 2 つのうちの 1 つは必要です
* ほとんどの環(huán)境で確実に動(dòng)作します
*/
if(!@copy($this->file_temp, $this->upload_path.$this->file_name)){
if(!@ move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name)){
$this->set_error("upload_destination_error");
return FALSE;
}
}

/* 最終的な畫(huà)像の寸法を設(shè)定します

* ファイルが畫(huà)像であると仮定します)。? この情報(bào)は
* 「data」関數(shù)で使用します。
*/
$this->set_image_properties($this->upload_path.$this->file_name);

//現(xiàn)在のファイルデータを multi_file_upload_data に設(shè)定します。

}

//すべてのファイルアップロードデータを返します。

}
}