<?php
/*************************************************************************************
   Copyright notice
   
   (c) 2002-2012 Oliver Georgi <oliver@phpwcms.de> // All rights reserved.
 
   This script is part of PHPWCMS. The PHPWCMS web content management system is
   free software; you can redistribute it and/or modify it under the terms of
   the GNU General Public License as published by the Free Software Foundation;
   either version 2 of the License, or (at your option) any later version.
  
   The GNU General Public License can be found at http://www.gnu.org/copyleft/gpl.html
   A copy is found in the textfile GPL.txt and important notices to the license 
   from the author is found in LICENSE.txt distributed with these scripts.
  
   This script 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 General Public License for more details.
 
   This copyright notice MUST APPEAR in all copies of the script!
*************************************************************************************/

// ----------------------------------------------------------------
// obligate check for phpwcms constants
if (!defined('PHPWCMS_ROOT')) {
   die("You Cannot Access This Script Directly, Have a Nice Day.");
}
// ----------------------------------------------------------------


function _getFileInfo($value, $limit='1', $mode='hash') {

	$sql = '';

	switch($mode) {

		case 'hash':	$sql  = "SELECT * FROM ".DB_PREPEND."phpwcms_file WHERE f_aktiv=1 AND ";
						$sql .= "f_trash=0 AND f_public=1 AND ";
						$sql .= "f_hash='".aporeplace($value)."'";
						if( !FEUSER_LOGIN_STATUS ) {
							$sql .= ' AND f_granted=0';
						}
						if($limit) {
							$sql .= " LIMIT ".$limit;
						}
						break;
	}

	return _dbQuery($sql);
	
}

function dl_file_resume($file='', $fileinfo=array(), $onsuccess = false) {

	// function based on this one here:
	// http://www.php.net/manual/de/function.fread.php#63893

	//First, see if the file exists
	if (!is_file($file) && connection_status()) return false;
	
	//Gather relevent info about file
	$filename 		= empty($fileinfo['realfname'])	? basename($file) : $fileinfo['realfname'];
	$disposition	= empty($fileinfo['method'])	? 'attachment' : $fileinfo['method'];
	
	if($disposition == 'attachment') {
	
		$fileinfo['mimetype'] = "application/force-download";
	
	}
	
	if(empty($fileinfo['mimetype']) && empty($fileinfo['extension'])) {
	
		$file_extension	= strtolower(substr(strrchr($filename,"."),1));
		$ctype			= isset($GLOBALS['phpwcms']['mime_types'][$file_extension]) ? $GLOBALS['phpwcms']['mime_types'][$file_extension] : 'application/force-download';
	
	} else {
	
		$ctype 			= $fileinfo['mimetype'];
		$file_extension	= $fileinfo['extension'];
	
	}

	//Begin writing headers
	header('Cache-Control: ');
	header('Cache-Control: public');
	header('Pragma: ');
	
	//Use the switch-generated Content-Type
	header('Content-Type: '.$ctype);
	
	
	if (isset($_SERVER['HTTP_USER_AGENT']) && strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
		// workaround for IE filename bug with multiple periods / multiple dots in filename
		// that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe
		$filename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
	}
	
	
	//header('Accept-Ranges: bytes');
	
	$size = filesize($file);

	
	header('Content-Length: '.$size);
	header('Content-Transfer-Encoding: binary'.LF);
	header('Content-Disposition: '.$disposition.'; filename="'.$filename.'"');
	

	//reset time limit for big files
	@set_time_limit(0);

	//open the file
	$fp = fopen($file, 'rb');

	//seek to start of missing part
	//fseek($fp, $range);

	//start buffered download
	while(!feof($fp) && !connection_status()){
	
		print(fread($fp, 1024*8));
		flush();
		//ob_flush();
	}
	fclose($fp);

	return ($onsuccess && !connection_status() && !connection_aborted()) ? true : false;
}

// http://www.thomthom.net/blog/2007/09/php-resumable-download-server/
function rangeDownload($file) {
 
	$fp = @fopen($file, 'rb');
 
	$size   = filesize($file); // File size
	$length = $size;           // Content length
	$start  = 0;               // Start byte
	$end    = $size - 1;       // End byte
	// Now that we've gotten so far without errors we send the accept range header
	/* At the moment we only support single ranges.
	 * Multiple ranges requires some more work to ensure it works correctly
	 * and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
	 *
	 * Multirange support annouces itself with:
	 * header('Accept-Ranges: bytes');
	 *
	 * Multirange content must be sent with multipart/byteranges mediatype,
	 * (mediatype = mimetype)
	 * as well as a boundry header to indicate the various chunks of data.
	 */
	header("Accept-Ranges: 0-$length");
	// header('Accept-Ranges: bytes');
	// multipart/byteranges
	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
	if (isset($_SERVER['HTTP_RANGE'])) {
 
		$c_start = $start;
		$c_end   = $end;
		// Extract the range string
		list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
		// Make sure the client hasn't sent us a multibyte range
		if (strpos($range, ',') !== false) {
 
			// (?) Shoud this be issued here, or should the first
			// range be used? Or should the header be ignored and
			// we output the whole content?
			header('HTTP/1.1 416 Requested Range Not Satisfiable');
			header("Content-Range: bytes $start-$end/$size");
			// (?) Echo some info to the client?
			exit;
		}
		// If the range starts with an '-' we start from the beginning
		// If not, we forward the file pointer
		// And make sure to get the end byte if spesified
		if ($range0 == '-') {
 
			// The n-number of the last bytes is requested
			$c_start = $size - substr($range, 1);
		}
		else {
 
			$range  = explode('-', $range);
			$c_start = $range[0];
			$c_end   = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
		}
		/* Check the range and make sure it's treated according to the specs.
		 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
		 */
		// End bytes can not be larger than $end.
		$c_end = ($c_end > $end) ? $end : $c_end;
		// Validate the requested range and return an error if it's not correct.
		if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {
 
			header('HTTP/1.1 416 Requested Range Not Satisfiable');
			header("Content-Range: bytes $start-$end/$size");
			// (?) Echo some info to the client?
			exit;
		}
		$start  = $c_start;
		$end    = $c_end;
		$length = $end - $start + 1; // Calculate new content length
		fseek($fp, $start);
		header('HTTP/1.1 206 Partial Content');
	}
	// Notify the client the byte range we'll be outputting
	header("Content-Range: bytes $start-$end/$size");
	header("Content-Length: $length");
 
	// Start buffered download
	$buffer = 1024 * 8;
	while(!feof($fp) && ($p = ftell($fp)) <= $end) {
 
		if ($p + $buffer > $end) {
 
			// In case we're only outputtin a chunk, make sure we don't
			// read past the length
			$buffer = $end - $p + 1;
		}
		set_time_limit(0); // Reset time limit for big files
		echo fread($fp, $buffer);
		flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.
	}
 
	fclose($fp);
 
}


?>