app/src/main/webapp/roller-ui/authoring/editors/xinha-1.5.1/unsupported_plugins/ImageManager/Classes/ImageEditor.php - roller - Git at Google

 <?php
 /**
  * Image Editor. Editing tools, crop, rotate, scale and save.
  * @author $Author:ray $
  * @version $Id:ImageEditor.php 938 2008-01-22 20:13:47Z ray $
  * @package ImageManager
  */

 require_once('../ImageManager/Classes/Transform.php');

 /**
  * Handles the basic image editing capbabilities.
  * @author $Author:ray $
  * @version $Id:ImageEditor.php 938 2008-01-22 20:13:47Z ray $
  * @package ImageManager
  * @subpackage Editor
  */
 class ImageEditor
 {
 	/**
 	 * ImageManager instance.
 	 */
 	var $manager;

 	/**
 	 * user based on IP address
 	 */
 	var $_uid;

 	/**
 	 * tmp file storage time.
 	 */
 	var $lapse_time =900; //15 mins

 	var $filesaved = 0;

 	/**
 	 * Create a new ImageEditor instance. Editing requires a
 	 * tmp file, which is saved in the current directory where the
 	 * image is edited. The tmp file is assigned by md5 hash of the
 	 * user IP address. This hashed is used as an ID for cleaning up
 	 * the tmp files. In addition, any tmp files older than the
 	 * the specified period will be deleted.
 	 * @param ImageManager $manager the image manager, we need this
 	 * for some file and path handling functions.
 	 */
 	function ImageEditor($manager)
 	{
 		$this->manager = $manager;
 		$this->_uid = md5($_SERVER['REMOTE_ADDR']);
 	}

 	/**
 	 * Did we save a file?
 	 * @return int 1 if the file was saved sucessfully,
 	 * 0 no save operation, -1 file save error.
 	 */
 	function isFileSaved()
 	{
 		Return $this->filesaved;
 	}

 	/**
 	 * Process the image, if not action, just display the image.
 	 * @return array with image information, empty array if not an image.
 	 * <code>array('src'=>'url of the image', 'dimensions'=>'width="xx" height="yy"',
 	 * 'file'=>'image file, relative', 'fullpath'=>'full path to the image');</code>
 	 */
 	function processImage()
 	{
 		if(isset($_GET['img']))
 			$relative = rawurldecode($_GET['img']);
 		else
 			Return array();

 		//$relative = '/Series2004NoteFront.jpg';

 		$imgURL = $this->manager->getFileURL($relative);
 		$fullpath = $this->manager->getFullPath($relative);

 		$imgInfo = @getImageSize($fullpath);
 		if(!is_array($imgInfo))
 			Return array();

 		$action = $this->getAction();

 		if(!is_null($action))
 		{
 			$image = $this->processAction($action, $relative, $fullpath);
 		}
 		else
 		{
 			$image['src'] = $imgURL;
 			$image['dimensions'] = $imgInfo[3];
 			$image['file'] = $relative;
 			$image['fullpath'] = $fullpath;
 			$image['filesize'] = @filesize($fullpath);
 		}

 		Return $image;
 	}

 	/**
 	 * Process the actions, crop, scale(resize), rotate, flip, and save.
 	 * When ever an action is performed, the result is save into a
 	 * temporary image file, see createUnique on the filename specs.
 	 * It does not return the saved file, alway returning the tmp file.
 	 * @param string $action, should be 'crop', 'scale', 'rotate','flip', or 'save'
 	 * @param string $relative the relative image filename
 	 * @param string $fullpath the fullpath to the image file
 	 * @return array with image information
 	 * <code>array('src'=>'url of the image', 'dimensions'=>'width="xx" height="yy"',
 	 * 'file'=>'image file, relative', 'fullpath'=>'full path to the image');</code>
 	 */
 	function processAction($action, $relative, $fullpath)
 	{
 		$params = '';

 		if(isset($_GET['params']))
 			$params = $_GET['params'];

 		$values =  explode(',',$params);
 		$saveFile = $this->getSaveFileName($values[0]);

 		$img = Image_Transform::factory(IMAGE_CLASS);
 		$img->load($fullpath);

 		if ( is_callable( array($img,'paletteToTrueColorWithTransparency')) && !imageistruecolor($img->imageHandle))
 		{
 			$img->paletteToTrueColorWithTransparency();
 		}
 		switch ($action)
 		{
 			case 'crop':
 				$img->crop(intval($values[0]),intval($values[1]),
 							intval($values[2]),intval($values[3]));
 			break;
 			case 'scale':
 				$img->resize(intval($values[0]),intval($values[1]));
 				break;
 			case 'rotate':
 				$img->rotate(floatval($values[0]));
 				break;
 			case 'flip':
 				if ($values[0] == 'hoz')
 					$img->flip(true);
 				else if($values[0] == 'ver')
 					$img->flip(false);
 				break;
 			case 'save':
 				if(!is_null($saveFile))
 				{
 					$quality = intval($values[1]);
 		            if($quality <0) $quality = 85;
 					$newSaveFile = $this->makeRelative($relative, $saveFile);
 					$newSaveFile = $this->getUniqueFilename($newSaveFile);

 					//get unique filename just returns the filename, so
 					//we need to make the relative path once more.
 					$newSaveFile = $this->makeRelative($relative, $newSaveFile);
           			$image['saveFile'] = $newSaveFile;
 					$newSaveFullpath = $this->manager->getFullPath($newSaveFile);
 					if ( $values[0] == 'gif' && is_callable(array($img, 'preserveTransparencyForPalette')))
 					{
 						$img->preserveTransparencyForPalette();
 					}
 					$img->save($newSaveFullpath, $values[0], $quality);
 					if(is_file($newSaveFullpath))
 						$this->filesaved = 1;
 					else
 						$this->filesaved = -1;
 				}
 				break;
 				case 'preview':
 					$quality = intval($values[1]);


 					$image['file'] = $relative;
 					$image['fullpath'] = $fullpath;

 					//create the tmp image file
 					$filename = $this->createUnique($fullpath);
 					$newRelative = $this->makeRelative($relative, $filename);
 					$newFullpath = $this->manager->getFullPath($newRelative);
 					$newURL = $this->manager->getFileURL($newRelative);


 					if ( $values[0] == 'gif' && is_callable(array($img, 'preserveTransparencyForPalette')))
 					{
 						$img->preserveTransparencyForPalette();
 					}
 					$img->save($newFullpath, $values[0] );
 					$img->free();

 					//get the image information
 					$imgInfo = @getimagesize($newFullpath);

 					$image['src'] = $newURL;
 			    	$image['width'] = $imgInfo[0];
 			   		$image['height'] = $imgInfo[1];
 					$image['dimensions'] = $imgInfo[3];
 					$image['file'] = $relative;
 					$image['fullpath'] = $fullpath;
 					$image['filesize'] = @filesize($newFullpath);

 					Return $image;

 				break;
 		}

 		//create the tmp image file
 		$filename = $this->createUnique($fullpath);
 		$newRelative = $this->makeRelative($relative, $filename);
 		$newFullpath = $this->manager->getFullPath($newRelative);
 		$newURL = $this->manager->getFileURL($newRelative);

 		//save the file.
 		$img->save($newFullpath, 'png' );
 		$img->free();

 		//get the image information
 		$imgInfo = @getimagesize($newFullpath);

 		$image['src'] = $newURL;
     	$image['width'] = $imgInfo[0];
    		$image['height'] = $imgInfo[1];
 		$image['dimensions'] = $imgInfo[3];
 		$image['file'] = $newRelative;
 		$image['fullpath'] = $newFullpath;
 		$image['filesize'] = @filesize($newFullpath);
 		$image['type'] = image_type_to_mime_type($imgInfo[2]);

 		Return $image;

 	}

 	/**
 	 * Get the file name base on the save name
 	 * and the save type.
 	 * @param string $type image type, 'jpeg', 'png', or 'gif'
 	 * @return string the filename according to save type
 	 */
 	function getSaveFileName($type)
 	{
 		if(!isset($_GET['file']))
 			Return null;

 		$filename = Files::escape(rawurldecode($_GET['file']));
 		$index = strrpos($filename,'.');
 		$base = substr($filename,0,$index);
 		$ext = strtolower(substr($filename,$index+1,strlen($filename)));

 		if($type == 'jpeg' && !($ext=='jpeg' || $ext=='jpg'))
 		{
 			Return $base.'.jpeg';
 		}
 		if($type=='png' && $ext != 'png')
 			Return $base.'.png';
 		if($type=='gif' && $ext != 'gif')
 			Return $base.'.gif';

     // Ensure type is in acceptable image types
     $valid_extensions = $this->manager->config['allowed_image_extensions'];
     if(!in_array($ext, $valid_extensions))
 		{
       return $base . ".".strtolower($type ? $type : 'jpg');
 		}

 		Return $filename;
 	}

 	/**
 	 * Get the default save file name, used by editor.php.
 	 * @return string a suggestive filename, this should be unique
 	 */
 	function getDefaultSaveFile()
 	{
 		if(isset($_GET['img']))
 			$relative = rawurldecode($_GET['img']);
 		else
 			Return null;

 		Return $this->getUniqueFilename($relative);
 	}

 	/**
 	 * Get a unique filename. If the file exists, the filename
 	 * base is appended with an increasing integer.
 	 * @param string $relative the relative filename to the base_dir
 	 * @return string a unique filename in the current path
 	 */
 	function getUniqueFilename($relative)
 	{
 		$fullpath = $this->manager->getFullPath($relative);

 		$pathinfo = pathinfo($fullpath);

 		$path = Files::fixPath($pathinfo['dirname']);
 		$file = Files::escape($pathinfo['basename']);

 		$filename = $file;

 		$dotIndex = strrpos($file, '.');
 		$ext = '';

 		if(is_int($dotIndex))
 		{
 			$ext = substr($file, $dotIndex);
 			$base = substr($file, 0, $dotIndex);
 		}

 		$counter = 0;
 		while(is_file($path.$filename))
 		{
 			$counter++;
 			$filename = $base.'_'.$counter.$ext;
 		}

 		Return $filename;

 	}

 	/**
 	 * Specifiy the original relative path, a new filename
 	 * and return the new filename with relative path.
 	 * i.e. $pathA (-filename) + $file
 	 * @param string $pathA the relative file
 	 * @param string $file the new filename
 	 * @return string relative path with the new filename
 	 */
 	function makeRelative($pathA, $file)
 	{
 		$index = strrpos($pathA,'/');
 		if(!is_int($index))
 			Return $file;

 		$path = substr($pathA, 0, $index);
 		Return Files::fixPath($path).$file;
 	}

 	/**
 	 * Get the action GET parameter
 	 * @return string action parameter
 	 */
 	function getAction()
 	{
 		$action = null;
 		if(isset($_GET['action']))
 			$action = $_GET['action'];
 		Return $action;
 	}

 	/**
 	 * Generate a unique string based on md5(microtime()).
 	 * Well not so uniqe, as it is limited to 6 characters
 	 * @return string unique string.
 	 */
     function uniqueStr()
     {
       return substr(md5(microtime()),0,6);
     }

 	/**
 	 * Create unique tmp image file name.
 	 * The filename is based on the tmp file prefix
 	 * specified in config.inc.php plus
 	 * the UID (basically a md5 of the remote IP)
 	 * and some random 6 character string.
 	 * This function also calls to clean up the tmp files.
 	 * @param string $file the fullpath to a file
 	 * @return string a unique filename for that path
 	 * NOTE: it only returns the filename, path no included.
 	 */
 	function createUnique($file)
 	{
 		$pathinfo = pathinfo($file);
 		$path = Files::fixPath($pathinfo['dirname']);
 		$imgType = $this->getImageType($file);

 		$unique_str = $this->manager->getTmpPrefix().$this->_uid.'_'.$this->uniqueStr().".".$imgType;

 	   //make sure the the unique temp file does not exists
         while (file_exists($path.$unique_str))
         {
             $unique_str = $this->manager->getTmpPrefix().$this->_uid.'_'.$this->uniqueStr().".".$imgType;
         }

 		$this->cleanUp($path,$pathinfo['basename']);

 		Return $unique_str;
 	}

 	/**
 	 * Delete any tmp image files.
 	 * @param string $path the full path
 	 * where the clean should take place.
 	 */
 	function cleanUp($path,$file)
 	{
 		$path = Files::fixPath($path);

 		if(!is_dir($path))
 			Return false;

 		$d = @dir($path);

 		$tmp = $this->manager->getTmpPrefix();
 		$tmpLen = strlen($tmp);

 		$prefix = $tmp.$this->_uid;
 		$len = strlen($prefix);

 		while (false !== ($entry = $d->read()))
 		{
 			//echo $entry."<br>";
 			if(is_file($path.$entry) && $this->manager->isTmpFile($entry))
 			{
 				if(substr($entry,0,$len)==$prefix && $entry != $file)
 					Files::delFile($path.$entry);
 				else if(substr($entry,0,$tmpLen)==$tmp && $entry != $file)
 				{
 					if(filemtime($path.$entry)+$this->lapse_time < time())
 						Files::delFile($path.$entry);
 				}
 			}
 		}
 		$d->close();
 	}

 	/**
 	 * Get the image type base on an image file.
 	 * @param string $file the full path to the image file.
 	 * @return string of either 'gif', 'jpeg', 'png' or 'bmp'
 	 * otherwise it will return null.
 	 */
 	function getImageType($file)
 	{
 		$imageInfo = @getImageSize($file);

 		if(!is_array($imageInfo))
 			Return null;

 		switch($imageInfo[2])
 		{
 			case 1:
 				Return 'gif';
 			case 2:
 				Return 'jpeg';
 			case 3:
 				Return 'png';
 			case 6:
 				Return 'bmp';
 		}

 		Return null;
 	}

 	/**
 	 * Check if the specified image can be edit by GD
 	 * mainly to check that GD can read and save GIFs
 	 * @return int 0 if it is not a GIF file, 1 is GIF is editable, -1 if not editable.
 	 */
 	function isGDEditable()
 	{
 		if(isset($_GET['img']))
 			$relative = rawurldecode($_GET['img']);
 		else
 			Return 0;
 		if(IMAGE_CLASS != 'GD')
 			Return 0;

 		$fullpath = $this->manager->getFullPath($relative);

 		$type = $this->getImageType($fullpath);
 		if($type != 'gif')
 			Return 0;

 		if(function_exists('ImageCreateFrom'.$type)
 			&& function_exists('image'.$type))
 			Return 1;
 		else
 			Return -1;
 	}

 	/**
 	 * Check if GIF can be edit by GD.
 	 * @return int 0 if it is not using the GD library, 1 is GIF is editable, -1 if not editable.
 	 */
 	function isGDGIFAble()
 	{
 		if(IMAGE_CLASS != 'GD')
 			Return 0;

 		if(function_exists('ImageCreateFromGif')
 			&& function_exists('imagegif'))
 			Return 1;
 		else
 			Return -1;
 	}
 }

 ?>
	<?php
	/**
	* Image Editor. Editing tools, crop, rotate, scale and save.
	* @author $Author:ray $
	* @version $Id:ImageEditor.php 938 2008-01-22 20:13:47Z ray $
	* @package ImageManager
	*/

	require_once('../ImageManager/Classes/Transform.php');

	/**
	* Handles the basic image editing capbabilities.
	* @author $Author:ray $
	* @version $Id:ImageEditor.php 938 2008-01-22 20:13:47Z ray $
	* @package ImageManager
	* @subpackage Editor
	*/
	class ImageEditor
	{
	/**
	* ImageManager instance.
	*/
	var $manager;

	/**
	* user based on IP address
	*/
	var $_uid;

	/**
	* tmp file storage time.
	*/
	var $lapse_time =900; //15 mins

	var $filesaved = 0;

	/**
	* Create a new ImageEditor instance. Editing requires a
	* tmp file, which is saved in the current directory where the
	* image is edited. The tmp file is assigned by md5 hash of the
	* user IP address. This hashed is used as an ID for cleaning up
	* the tmp files. In addition, any tmp files older than the
	* the specified period will be deleted.
	* @param ImageManager $manager the image manager, we need this
	* for some file and path handling functions.
	*/
	function ImageEditor($manager)
	{
	$this->manager = $manager;
	$this->_uid = md5($_SERVER['REMOTE_ADDR']);
	}

	/**
	* Did we save a file?
	* @return int 1 if the file was saved sucessfully,
	* 0 no save operation, -1 file save error.
	*/
	function isFileSaved()
	{
	Return $this->filesaved;
	}

	/**
	* Process the image, if not action, just display the image.
	* @return array with image information, empty array if not an image.
	* <code>array('src'=>'url of the image', 'dimensions'=>'width="xx" height="yy"',
	* 'file'=>'image file, relative', 'fullpath'=>'full path to the image');</code>
	*/
	function processImage()
	{
	if(isset($_GET['img']))
	$relative = rawurldecode($_GET['img']);
	else
	Return array();

	//$relative = '/Series2004NoteFront.jpg';

	$imgURL = $this->manager->getFileURL($relative);
	$fullpath = $this->manager->getFullPath($relative);

	$imgInfo = @getImageSize($fullpath);
	if(!is_array($imgInfo))
	Return array();

	$action = $this->getAction();

	if(!is_null($action))
	{
	$image = $this->processAction($action, $relative, $fullpath);
	}
	else
	{
	$image['src'] = $imgURL;
	$image['dimensions'] = $imgInfo[3];
	$image['file'] = $relative;
	$image['fullpath'] = $fullpath;
	$image['filesize'] = @filesize($fullpath);
	}

	Return $image;
	}

	/**
	* Process the actions, crop, scale(resize), rotate, flip, and save.
	* When ever an action is performed, the result is save into a
	* temporary image file, see createUnique on the filename specs.
	* It does not return the saved file, alway returning the tmp file.
	* @param string $action, should be 'crop', 'scale', 'rotate','flip', or 'save'
	* @param string $relative the relative image filename
	* @param string $fullpath the fullpath to the image file
	* @return array with image information
	* <code>array('src'=>'url of the image', 'dimensions'=>'width="xx" height="yy"',
	* 'file'=>'image file, relative', 'fullpath'=>'full path to the image');</code>
	*/
	function processAction($action, $relative, $fullpath)
	{
	$params = '';

	if(isset($_GET['params']))
	$params = $_GET['params'];

	$values = explode(',',$params);
	$saveFile = $this->getSaveFileName($values[0]);

	$img = Image_Transform::factory(IMAGE_CLASS);
	$img->load($fullpath);

	if ( is_callable( array($img,'paletteToTrueColorWithTransparency')) && !imageistruecolor($img->imageHandle))
	{
	$img->paletteToTrueColorWithTransparency();
	}
	switch ($action)
	{
	case 'crop':
	$img->crop(intval($values[0]),intval($values[1]),
	intval($values[2]),intval($values[3]));
	break;
	case 'scale':
	$img->resize(intval($values[0]),intval($values[1]));
	break;
	case 'rotate':
	$img->rotate(floatval($values[0]));
	break;
	case 'flip':
	if ($values[0] == 'hoz')
	$img->flip(true);
	else if($values[0] == 'ver')
	$img->flip(false);
	break;
	case 'save':
	if(!is_null($saveFile))
	{
	$quality = intval($values[1]);
	if($quality <0) $quality = 85;
	$newSaveFile = $this->makeRelative($relative, $saveFile);
	$newSaveFile = $this->getUniqueFilename($newSaveFile);

	//get unique filename just returns the filename, so
	//we need to make the relative path once more.
	$newSaveFile = $this->makeRelative($relative, $newSaveFile);
	$image['saveFile'] = $newSaveFile;
	$newSaveFullpath = $this->manager->getFullPath($newSaveFile);
	if ( $values[0] == 'gif' && is_callable(array($img, 'preserveTransparencyForPalette')))
	{
	$img->preserveTransparencyForPalette();
	}
	$img->save($newSaveFullpath, $values[0], $quality);
	if(is_file($newSaveFullpath))
	$this->filesaved = 1;
	else
	$this->filesaved = -1;
	}
	break;
	case 'preview':
	$quality = intval($values[1]);


	$image['file'] = $relative;
	$image['fullpath'] = $fullpath;

	//create the tmp image file
	$filename = $this->createUnique($fullpath);
	$newRelative = $this->makeRelative($relative, $filename);
	$newFullpath = $this->manager->getFullPath($newRelative);
	$newURL = $this->manager->getFileURL($newRelative);


	if ( $values[0] == 'gif' && is_callable(array($img, 'preserveTransparencyForPalette')))
	{
	$img->preserveTransparencyForPalette();
	}
	$img->save($newFullpath, $values[0] );
	$img->free();

	//get the image information
	$imgInfo = @getimagesize($newFullpath);

	$image['src'] = $newURL;
	$image['width'] = $imgInfo[0];
	$image['height'] = $imgInfo[1];
	$image['dimensions'] = $imgInfo[3];
	$image['file'] = $relative;
	$image['fullpath'] = $fullpath;
	$image['filesize'] = @filesize($newFullpath);

	Return $image;

	break;
	}

	//create the tmp image file
	$filename = $this->createUnique($fullpath);
	$newRelative = $this->makeRelative($relative, $filename);
	$newFullpath = $this->manager->getFullPath($newRelative);
	$newURL = $this->manager->getFileURL($newRelative);

	//save the file.
	$img->save($newFullpath, 'png' );
	$img->free();

	//get the image information
	$imgInfo = @getimagesize($newFullpath);

	$image['src'] = $newURL;
	$image['width'] = $imgInfo[0];
	$image['height'] = $imgInfo[1];
	$image['dimensions'] = $imgInfo[3];
	$image['file'] = $newRelative;
	$image['fullpath'] = $newFullpath;
	$image['filesize'] = @filesize($newFullpath);
	$image['type'] = image_type_to_mime_type($imgInfo[2]);

	Return $image;

	}

	/**
	* Get the file name base on the save name
	* and the save type.
	* @param string $type image type, 'jpeg', 'png', or 'gif'
	* @return string the filename according to save type
	*/
	function getSaveFileName($type)
	{
	if(!isset($_GET['file']))
	Return null;

	$filename = Files::escape(rawurldecode($_GET['file']));
	$index = strrpos($filename,'.');
	$base = substr($filename,0,$index);
	$ext = strtolower(substr($filename,$index+1,strlen($filename)));

	if($type == 'jpeg' && !($ext=='jpeg' \|\| $ext=='jpg'))
	{
	Return $base.'.jpeg';
	}
	if($type=='png' && $ext != 'png')
	Return $base.'.png';
	if($type=='gif' && $ext != 'gif')
	Return $base.'.gif';

	// Ensure type is in acceptable image types
	$valid_extensions = $this->manager->config['allowed_image_extensions'];
	if(!in_array($ext, $valid_extensions))
	{
	return $base . ".".strtolower($type ? $type : 'jpg');
	}

	Return $filename;
	}

	/**
	* Get the default save file name, used by editor.php.
	* @return string a suggestive filename, this should be unique
	*/
	function getDefaultSaveFile()
	{
	if(isset($_GET['img']))
	$relative = rawurldecode($_GET['img']);
	else
	Return null;

	Return $this->getUniqueFilename($relative);
	}

	/**
	* Get a unique filename. If the file exists, the filename
	* base is appended with an increasing integer.
	* @param string $relative the relative filename to the base_dir
	* @return string a unique filename in the current path
	*/
	function getUniqueFilename($relative)
	{
	$fullpath = $this->manager->getFullPath($relative);

	$pathinfo = pathinfo($fullpath);

	$path = Files::fixPath($pathinfo['dirname']);
	$file = Files::escape($pathinfo['basename']);

	$filename = $file;

	$dotIndex = strrpos($file, '.');
	$ext = '';

	if(is_int($dotIndex))
	{
	$ext = substr($file, $dotIndex);
	$base = substr($file, 0, $dotIndex);
	}

	$counter = 0;
	while(is_file($path.$filename))
	{
	$counter++;
	$filename = $base.'_'.$counter.$ext;
	}

	Return $filename;

	}

	/**
	* Specifiy the original relative path, a new filename
	* and return the new filename with relative path.
	* i.e. $pathA (-filename) + $file
	* @param string $pathA the relative file
	* @param string $file the new filename
	* @return string relative path with the new filename
	*/
	function makeRelative($pathA, $file)
	{
	$index = strrpos($pathA,'/');
	if(!is_int($index))
	Return $file;

	$path = substr($pathA, 0, $index);
	Return Files::fixPath($path).$file;
	}

	/**
	* Get the action GET parameter
	* @return string action parameter
	*/
	function getAction()
	{
	$action = null;
	if(isset($_GET['action']))
	$action = $_GET['action'];
	Return $action;
	}

	/**
	* Generate a unique string based on md5(microtime()).
	* Well not so uniqe, as it is limited to 6 characters
	* @return string unique string.
	*/
	function uniqueStr()
	{
	return substr(md5(microtime()),0,6);
	}

	/**
	* Create unique tmp image file name.
	* The filename is based on the tmp file prefix
	* specified in config.inc.php plus
	* the UID (basically a md5 of the remote IP)
	* and some random 6 character string.
	* This function also calls to clean up the tmp files.
	* @param string $file the fullpath to a file
	* @return string a unique filename for that path
	* NOTE: it only returns the filename, path no included.
	*/
	function createUnique($file)
	{
	$pathinfo = pathinfo($file);
	$path = Files::fixPath($pathinfo['dirname']);
	$imgType = $this->getImageType($file);

	$unique_str = $this->manager->getTmpPrefix().$this->_uid.'_'.$this->uniqueStr().".".$imgType;

	//make sure the the unique temp file does not exists
	while (file_exists($path.$unique_str))
	{
	$unique_str = $this->manager->getTmpPrefix().$this->_uid.'_'.$this->uniqueStr().".".$imgType;
	}

	$this->cleanUp($path,$pathinfo['basename']);

	Return $unique_str;
	}

	/**
	* Delete any tmp image files.
	* @param string $path the full path
	* where the clean should take place.
	*/
	function cleanUp($path,$file)
	{
	$path = Files::fixPath($path);

	if(!is_dir($path))
	Return false;

	$d = @dir($path);

	$tmp = $this->manager->getTmpPrefix();
	$tmpLen = strlen($tmp);

	$prefix = $tmp.$this->_uid;
	$len = strlen($prefix);

	while (false !== ($entry = $d->read()))
	{
	//echo $entry."<br>";
	if(is_file($path.$entry) && $this->manager->isTmpFile($entry))
	{
	if(substr($entry,0,$len)==$prefix && $entry != $file)
	Files::delFile($path.$entry);
	else if(substr($entry,0,$tmpLen)==$tmp && $entry != $file)
	{
	if(filemtime($path.$entry)+$this->lapse_time < time())
	Files::delFile($path.$entry);
	}
	}
	}
	$d->close();
	}

	/**
	* Get the image type base on an image file.
	* @param string $file the full path to the image file.
	* @return string of either 'gif', 'jpeg', 'png' or 'bmp'
	* otherwise it will return null.
	*/
	function getImageType($file)
	{
	$imageInfo = @getImageSize($file);

	if(!is_array($imageInfo))
	Return null;

	switch($imageInfo[2])
	{
	case 1:
	Return 'gif';
	case 2:
	Return 'jpeg';
	case 3:
	Return 'png';
	case 6:
	Return 'bmp';
	}

	Return null;
	}

	/**
	* Check if the specified image can be edit by GD
	* mainly to check that GD can read and save GIFs
	* @return int 0 if it is not a GIF file, 1 is GIF is editable, -1 if not editable.
	*/
	function isGDEditable()
	{
	if(isset($_GET['img']))
	$relative = rawurldecode($_GET['img']);
	else
	Return 0;
	if(IMAGE_CLASS != 'GD')
	Return 0;

	$fullpath = $this->manager->getFullPath($relative);

	$type = $this->getImageType($fullpath);
	if($type != 'gif')
	Return 0;

	if(function_exists('ImageCreateFrom'.$type)
	&& function_exists('image'.$type))
	Return 1;
	else
	Return -1;
	}

	/**
	* Check if GIF can be edit by GD.
	* @return int 0 if it is not using the GD library, 1 is GIF is editable, -1 if not editable.
	*/
	function isGDGIFAble()
	{
	if(IMAGE_CLASS != 'GD')
	Return 0;

	if(function_exists('ImageCreateFromGif')
	&& function_exists('imagegif'))
	Return 1;
	else
	Return -1;
	}
	}

	?>