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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: image_cache.cls.php,v $
* Created on: 2004-08-08
*
* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library in the file LICENSE.LGPL; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* Alternatively, you may distribute this software under the terms of the
* PHP License, version 3.0 or later. A copy of this license should have
* been distributed with this file in the file LICENSE.PHP . If this is not
* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
*
* The latest version of DOMPDF might be available at:
* http://www.digitaljunkies.ca/dompdf
*
* @link http://www.digitaljunkies.ca/dompdf
* @copyright 2004 Benj Carson
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @package dompdf
* @version 0.5.1
*/
/* $Id */
/**
* Static class that resolves image urls and downloads and caches
* remote images if required.
*
* @access private
* @package dompdf
*/
class Image_Cache {
/**
* Array of downloaded images. Cached so that identical images are
* not needlessly downloaded.
*
* @var array
*/
static protected $_cache = array();
/**
* Resolve and fetch an image for use.
*
* @param string $url The url of the image
* @param string $proto 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 $url
* @return array An array with two elements: The local path to the image and the image extension
*/
static function resolve_url($url, $proto, $host, $base_path) {
global $_dompdf_warnings;
$resolved_url = null;
// Remove dynamic part of url to determine the file extension
$tmp = preg_replace('/\?.*/','',$url);
// We need to preserve the file extenstion
$i = mb_strrpos($tmp, ".");
if ( $i === false )
throw new DOMPDF_Exception("Unknown image type: $url.");
$ext = mb_strtolower(mb_substr($tmp, $i+1));
$parsed_url = explode_url($url);
$remote = ($proto != "" && $proto != "file://");
$remote = $remote || ($parsed_url['protocol'] != "");
if ( !DOMPDF_ENABLE_REMOTE && $remote ) {
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
} else if ( DOMPDF_ENABLE_REMOTE && $remote ) {
// Download remote files to a temporary directory
$url = build_url($proto, $host, $base_path, $url);
if ( isset(self::$_cache[$url]) ) {
list($resolved_url,$ext) = self::$_cache[$url];
//echo "Using cached image $url (" . $resolved_url . ")\n";
} else {
//echo "Downloading file $url to temporary location: ";
$resolved_url = tempnam(DOMPDF_TEMP_DIR, "dompdf_img_");
//echo $resolved_url . "\n";
$old_err = set_error_handler("record_warnings");
$image = file_get_contents($url);
restore_error_handler();
if ( strlen($image) == 0 ) {
$image = file_get_contents(DOMPDF_LIB_DIR . "/res/broken_image.png");
$ext = "png";
}
file_put_contents($resolved_url, $image);
self::$_cache[$url] = array($resolved_url,$ext);
}
} else {
$resolved_url = build_url($proto, $host, $base_path, $url);
//echo $resolved_url . "\n";
}
if ( !is_readable($resolved_url) || !filesize($resolved_url) ) {
$_dompdf_warnings[] = "File " .$resolved_url . " is not readable or is an empty file.\n";
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
}
// Assume for now that all dynamic images are pngs
if ( $ext == "php" )
$ext = "png";
return array($resolved_url, $ext);
}
/**
* Unlink all cached images (i.e. temporary images either downloaded
* or converted)
*/
static function clear() {
if ( count(self::$_cache) ) {
foreach (self::$_cache as $entry) {
list($file, $ext) = $entry;
unlink($file);
}
}
}
}
?>
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