<?php
	$currDir=dirname(__FILE__);
	include("$currDir/defaultLang.php");
	include("$currDir/language.php");
	include("$currDir/lib.php");

	handle_maintenance();

	// image paths
	$p=array(   
		'students' => array(
			'photo' => $Translation['ImageFolder']
		),
		'instructors' => array(
			'photo' => $Translation['ImageFolder']
		)
	);

	if(!count($p)) exit;

	// receive user input
	$t=$_GET['t']; // table name
	$f=$_GET['f']; // field name
	$v=$_GET['v']; // thumbnail view type: 'tv' or 'dv'
	$i=$_GET['i']; // original image file name

	// validate input
	if(!in_array($t, array_keys($p)))  getImage();
	if(!in_array($f, array_keys($p[$t])))  getImage();
	if(!preg_match('/^[a-z0-9_]+\.(gif|png|jpg|jpeg|jpe)$/i', $i, $m)) getImage();
	if($v!='tv' && $v!='dv')   getImage();

	$img=$p[$t][$f].$i;
	$thumb=str_replace(".$m[1]ffffgggg", "_$v.$m[1]", $img.'ffffgggg');

	// if thumbnail exists and the user is not admin, output it without rebuilding the thumbnail
	if(getImage($thumb) && !getLoggedAdmin())  exit;

	// otherwise, try to create the thumbnail and output it
	if(!createThumbnail($img, getThumbnailSpecs($t, $f, $v)))  getImage();
	if(!getImage($thumb))  getImage();


	function getImage($img=''){
		if(!$img){ // default image to return
			$img='./photo.gif';
			$exit=TRUE;
		}
		$thumbInfo=@getimagesize($img);
		$fp=@fopen($img, 'rb');
		if($thumbInfo && $fp){
			header("Content-type: {$thumbInfo['mime']}");
			fpassthru($fp);
			if(!$exit) return TRUE; else exit;
		}

		if(!$exit) return FALSE; else exit;
	}