/var/www/hkosl.com/littleark/webadmin/libraies/dompdf/dompdf/src/Image/Cache.php


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<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Helmut Tischer <htischer@weihenstephan.org>
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf\Image;

use 
Dompdf\Dompdf;
use 
Dompdf\Helpers;
use 
Dompdf\Exception\ImageException;

/**
 * Static class that resolves image urls and downloads and caches
 * remote images if required.
 *
 * @package dompdf
 */
class Cache
{
    
/**
     * Array of downloaded images.  Cached so that identical images are
     * not needlessly downloaded.
     *
     * @var array
     */
    
protected static $_cache = array();

    
/**
     * The url to the "broken image" used when images can't be loaded
     *
     * @var string
     */
    
public static $broken_image "data:image/png;base64,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";
    
    
/**
     * Current dompdf instance
     *
     * @var Dompdf
     */
    
protected static $_dompdf;

    
/**
     * Resolve and fetch an image for use.
     *
     * @param string $url       The url of the image
     * @param string $protocol  Default protocol if none specified in $url
     * @param string $host      Default host if none specified in $url
     * @param string $base_path Default path if none specified in $url
     * @param Dompdf $dompdf    The Dompdf instance
     *
     * @throws ImageException
     * @return array             An array with two elements: The local path to the image and the image extension
     */
    
static function resolve_url($url$protocol$host$base_pathDompdf $dompdf)
    {
        
self::$_dompdf $dompdf;
        
        
$protocol mb_strtolower($protocol);
        
$parsed_url Helpers::explode_url($url);
        
$message null;

        
$remote = ($protocol && $protocol !== "file://") || ($parsed_url['protocol'] != "");

        
$data_uri strpos($parsed_url['protocol'], "data:") === 0;
        
$full_url null;
        
$enable_remote $dompdf->get_option("enable_remote");

        try {

            
// Remote not allowed and is not DataURI
            
if (!$enable_remote && $remote && !$data_uri) {
                throw new 
ImageException("Remote file access is disabled."E_WARNING);
            } 
// Remote allowed or DataURI
            
else {
                if (
$enable_remote && $remote || $data_uri) {
                    
// Download remote files to a temporary directory
                    
$full_url Helpers::build_url($protocol$host$base_path$url);

                    
// From cache
                    
if (isset(self::$_cache[$full_url])) {
                        
$resolved_url self::$_cache[$full_url];
                    } 
// From remote
                    
else {
                        
$tmp_dir $dompdf->get_option("temp_dir");
                        
$resolved_url tempnam($tmp_dir"ca_dompdf_img_");
                        
$image "";

                        if (
$data_uri) {
                            if (
$parsed_data_uri Helpers::parse_data_uri($url)) {
                                
$image $parsed_data_uri['data'];
                            }
                        } else {
                            
set_error_handler(array("\\Dompdf\\Helpers""record_warnings"));
                            
$image file_get_contents($full_urlnull$dompdf->getHttpContext());
                            
restore_error_handler();
                        }

                        
// Image not found or invalid
                        
if (strlen($image) == 0) {
                            
$msg = ($data_uri "Data-URI could not be parsed" "Image not found");
                            throw new 
ImageException($msgE_WARNING);
                        } 
// Image found, put in cache and process
                        
else {
                            
//e.g. fetch.php?media=url.jpg&cache=1
                            //- Image file name might be one of the dynamic parts of the url, don't strip off!
                            //- a remote url does not need to have a file extension at all
                            //- local cached file does not have a matching file extension
                            //Therefore get image type from the content
                            
file_put_contents($resolved_url$image);
                        }
                    }
                } 
// Not remote, local image
                
else {
                    
$resolved_url Helpers::build_url($protocol$host$base_path$url);
                }
            }

            
// Check if the local file is readable
            
if (!is_readable($resolved_url) || !filesize($resolved_url)) {
                throw new 
ImageException("Image not readable or empty"E_WARNING);
            } 
// Check is the file is an image
            
else {
                list(
$width$height$type) = Helpers::dompdf_getimagesize($resolved_url$dompdf->getHttpContext());

                
// Known image type
                
if ($width && $height && in_array($type, array("gif""png""jpeg""bmp""svg"))) {
                    
//Don't put replacement image into cache - otherwise it will be deleted on cache cleanup.
                    //Only execute on successful caching of remote image.
                    
if ($enable_remote && $remote || $data_uri) {
                        
self::$_cache[$full_url] = $resolved_url;
                    }
                } 
// Unknown image type
                
else {
                    throw new 
ImageException("Image type unknown"E_WARNING);
                }
            }
        } catch (
ImageException $e) {
            
$resolved_url self::$broken_image;
            
$type "png";
            
$message "Image not found or type unknown";
            
Helpers::record_warnings($e->getCode(), $e->getMessage() . " \n $url"$e->getFile(), $e->getLine());
        }

        return array(
$resolved_url$type$message);
    }

    
/**
     * Unlink all cached images (i.e. temporary images either downloaded
     * or converted)
     */
    
static function clear()
    {
        if (empty(
self::$_cache) || self::$_dompdf->get_option("debugKeepTemp")) {
            return;
        }

        foreach (
self::$_cache as $file) {
            if (
self::$_dompdf->get_option("debugPng")) {
                print 
"[clear unlink $file]";
            }
            
unlink($file);
        }

        
self::$_cache = array();
    }

    static function 
detect_type($file$context null)
    {
        list(, , 
$type) = Helpers::dompdf_getimagesize($file$context);

        return 
$type;
    }

    static function 
is_broken($url)
    {
        return 
$url === self::$broken_image;
    }
}

if (
file_exists(realpath(__DIR__ "/../../lib/res/broken_image.png"))) {
    
Cache::$broken_image realpath(__DIR__ "/../../lib/res/broken_image.png");
}