<?php

/**

 * Smarty plugin

 * @package Smarty

 * @subpackage plugins

 */

/**

 * 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>

 * 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)

 *

 * 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> - wrote first image function

 *           in repository, helped with lots of functionality

 * @version  1.0

 * @param array

 * @param Smarty

 * @return string

 * @uses smarty_function_escape_special_chars()

 */

function smarty_function_html_image($params, &$smarty)

{

    require_once $smarty->_get_plugin_filepath('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 {

                    $smarty->trigger_error("html_image: extra attribute '$_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 {

                    $smarty->trigger_error("html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE);

                }

                break;

        }

    }

    if (empty($file)) {

        $smarty->trigger_error("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)) {

                $smarty->trigger_error("html_image: unable to find '$_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 &&

            ($_params = array('resource_type' => 'file', 'resource_name' => $_image_path)) &&

            (require_once(SMARTY_CORE_DIR . 'core.is_secure.php')) &&

            (!smarty_core_is_secure($_params, $smarty)) ) {

            $smarty->trigger_error("html_image: (secure) '$_image_path' not in secure directory", E_USER_NOTICE);

        }        

        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;

}

/* vim: set expandtab: */

?>