<?php
/**
* Smarty plugin
* 
* @package Smarty
* @subpackage PluginsFunction
*/

/**
* Smarty {html_image} function plugin
* 
* Type:     function<br>
* Name:     html_image<br>
* Date:     Feb 24, 2003<br>
* Purpose:  format HTML tags for the image<br>
* Examples: {html_image file="/images/masthead.gif"}
* Output:   <img src="/images/masthead.gif" width=400 height=23>
* 
* @link http://smarty.php.net/manual/en/language.function.html.image.php {html_image}
      (Smarty online manual)
* @author Monte Ohrt <monte at ohrt dot com> 
* @author credits to Duda <duda@big.hu> 
* @version 1.0
* @param array $params parameters
* Input:<br>
*          - file = file (and path) of image (required)
*          - height = image height (optional, default actual height)
*          - width = image width (optional, default actual width)
*          - basedir = base directory for absolute paths, default
*                      is environment variable DOCUMENT_ROOT
*          - path_prefix = prefix for path output (optional, default empty)
* @param object $smarty Smarty object
* @param object $template template object
* @return string 
* @uses smarty_function_escape_special_chars()
*/
function smarty_function_html_image($params, $smarty, $template)
{
    require_once(SMARTY_PLUGINS_DIR . 'shared.escape_special_chars.php');
    //$smarty->loadPlugin('Smarty_shared_escape_special_chars');

    $alt = '';
    $file = '';
    $height = '';
    $width = '';
    $extra = '';
    $prefix = '';
    $suffix = '';
    $path_prefix = '';
    $server_vars = ($smarty->request_use_auto_globals) ? $_SERVER : $GLOBALS['HTTP_SERVER_VARS'];
    $basedir = isset($server_vars['DOCUMENT_ROOT']) ? $server_vars['DOCUMENT_ROOT'] : '';
    foreach($params as $_key => $_val) {
        switch ($_key) {
            case 'file':
            case 'height':
            case 'width':
            case 'dpi':
            case 'path_prefix':
            case 'basedir':
                $$_key = $_val;
                break;

            case 'alt':
                if (!is_array($_val)) {
                    $$_key = smarty_function_escape_special_chars($_val);
                } else {
                    throw new Exception ("html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE);
                } 
                break;

            case 'link':
            case 'href':
                $prefix = '<a href="' . $_val . '">';
                $suffix = '</a>';
                break;

            default:
                if (!is_array($_val)) {
                    $extra .= ' ' . $_key . '="' . smarty_function_escape_special_chars($_val) . '"';
                } else {
                    throw new Exception ("html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE);
                } 
                break;
        } 
    } 

    if (empty($file)) {
        throw new Exception ("html_image: missing 'file' parameter", E_USER_NOTICE);
        return;
    } 

    if (substr($file, 0, 1) == '/') {
        $_image_path = $basedir . $file;
    } else {
        $_image_path = $file;
    } 

    if (!isset($params['width']) || !isset($params['height'])) {
        if (!$_image_data = @getimagesize($_image_path)) {
            if (!file_exists($_image_path)) {
                throw new Exception ("html_image: unable to find '$_image_path'", E_USER_NOTICE);
                return;
            } else if (!is_readable($_image_path)) {
                throw new Exception ("html_image: unable to read '$_image_path'", E_USER_NOTICE);
                return;
            } else {
                throw new Exception ("html_image: '$_image_path' is not a valid image file", E_USER_NOTICE);
                return;
            } 
        } 
        if ($template->security) {
            if (!$smarty->security_handler->isTrustedResourceDir($_image_path)) {
                return;
            } 
        } 

        if (!isset($params['width'])) {
            $width = $_image_data[0];
        } 
        if (!isset($params['height'])) {
            $height = $_image_data[1];
        } 
    } 

    if (isset($params['dpi'])) {
        if (strstr($server_vars['HTTP_USER_AGENT'], 'Mac')) {
            $dpi_default = 72;
        } else {
            $dpi_default = 96;
        } 
        $_resize = $dpi_default / $params['dpi'];
        $width = round($width * $_resize);
        $height = round($height * $_resize);
    } 

    return $prefix . '<img src="' . $path_prefix . $file . '" alt="' . $alt . '" width="' . $width . '" height="' . $height . '"' . $extra . ' />' . $suffix;
} 

?>
