smarty/libs/plugins/function.html_image.php

<?php

/*
 * Smarty plugin
 * -------------------------------------------------------------
 * Type:     function
 * Name:     html_image
 * Version:  1.0
 * Date:     Feb 24, 2003
 * Author:	 Monte Ohrt <monte@ispi.net>
 * Credits:  Duda <duda@big.hu> - wrote first image function
 *           in repository, helped with lots of functionality
 * Purpose:  format HTML tags for the image
 * Input:    file = file (and path) of image (required)
 *           border = border width (optional, default 0)
 *           height = image height (optional, default actual height)
 *           image =image width (optional, default actual width)
 *           basedir = base directory for absolute paths, default
 *                     is environment variable DOCUMENT_ROOT
 * 
 * Examples: {image file="images/masthead.gif"}
 * Output:   <img src="images/masthead.gif" border=0 width=400 height=23>
 * -------------------------------------------------------------
 */
function smarty_function_html_image($params, &$smarty)
{	
	require_once $smarty->_get_plugin_filepath('shared','escape_special_chars');

	$file = '';
	$border = 0;
	$height = '';
	$width = '';
	$extra = '';
	$prefix = '';
	$suffix = '';
	$basedir = isset($GLOBALS['HTTP_SERVER_VARS']['DOCUMENT_ROOT'])
			? $GLOBALS['HTTP_SERVER_VARS']['DOCUMENT_ROOT'] : '/';
	if(strstr($GLOBALS['HTTP_SERVER_VARS']['HTTP_USER_AGENT'], 'Mac')) {
		$dpi_default = 72;
	} else {
		$dpi_default = 96;
	}
	
	foreach($params as $_key => $_val) {	
		switch($_key) {
			case 'file':
				$file = $_val;
				break;
			case 'border':
				$border = $_val;
				break;
			case 'height':
				$height = $_val;
				break;
			case 'width':
				$width = $_val;
				break;
			case 'link':
				$prefix = '<a href="' . $_val . '">';
				$suffix = '</a>';
				break;
			case 'dpi':
				$dpi = $_val;
				break;
			default:
				$extra .= ' '.$_key.'="'.smarty_function_escape_special_chars($_val).'"';
				break;					
		}
	}

    if (empty($file)) {
        $smarty->trigger_error("html_image: missing 'file' parameter", E_USER_NOTICE);
        return;
    }

	if(substr($file,0,1) == DIR_SEP) {
		$_image_path = $basedir . DIR_SEP . $file;
	} else {
		$_image_path = $file;
	}
	
	if(!isset($params['width']) || !isset($params['height'])) {
		if(!$_image_data = @getimagesize($_image_path)) {
			if(!file_exists($_image_path)) {
        		$smarty->trigger_error("html_image: unable to find '$_image_path'", E_USER_NOTICE);		
                return;
			} else if(!is_readable($_image_path)) {
        		$smarty->trigger_error("html_image: unable to read '$_image_path'", E_USER_NOTICE);		
                return;
			} else {
        		$smarty->trigger_error("html_image: '$_image_path' is not a valid image file", E_USER_NOTICE);
                return;
			}
		}
		if(!$smarty->security && !$smarty->_is_secure('file', $_image_path)) {
        	$smarty->trigger_error("html_image: (secure) '$_image_path' not in secure directory", E_USER_NOTICE);		
            return;
		}	
		
		if(!isset($params['width'])) {
			$width = $_image_data[0];
		}
		if(!isset($params['height'])) {
			$height = $_image_data[1];
		}
		
	}

	if(isset($params['dpi'])) {
		$_resize = $dpi_default/$params['dpi'];
		$width = round($width * $_resize);
		$height = round($height * $_resize);
	}
			
	return $prefix . '<img src="'.$file.'" border="'.$border.'" width="'.$width.'" height="'.$height.'"'.$extra.' />' . $suffix;
}

/* vim: set expandtab: */

?>