<?php
class Lib_Zip
{
	var $datasec = array();
	var $ctrl_dir = array();
	var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
	var $old_offset = 0;

	function add_dir($name) 
	{
		$name = str_replace("", "/", $name);

		$fr = "\x50\x4b\x03\x04";
		$fr .= "\x0a\x00";
		$fr .= "\x00\x00";
		$fr .= "\x00\x00";
		$fr .= "\x00\x00\x00\x00";
		
		$fr .= pack("V",0);
		$fr .= pack("V",0);
		$fr .= pack("V",0);
		$fr .= pack("v", strlen($name) );
		$fr .= pack("v", 0 );
		$fr .= $name;
		$fr .= pack("V", 0);
		$fr .= pack("V", 0);
		$fr .= pack("V", 0);
		
		$this -> datasec[] = $fr;
		$new_offset = strlen(implode("", $this->datasec));
		
		$cdrec = "\x50\x4b\x01\x02";
		$cdrec .="\x00\x00";
		$cdrec .="\x0a\x00";
		$cdrec .="\x00\x00";
		$cdrec .="\x00\x00";
		$cdrec .="\x00\x00\x00\x00";
		$cdrec .= pack("V",0);
		$cdrec .= pack("V",0);
		$cdrec .= pack("V",0);
		$cdrec .= pack("v", strlen($name) );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$ext = "\x00\x00\x10\x00";
		$ext = "\xff\xff\xff\xff";
		$cdrec .= pack("V", 16 );
		$cdrec .= pack("V", $this -> old_offset );
		$cdrec .= $name;
		
		$this -> ctrl_dir[] = $cdrec;
		$this -> old_offset = $new_offset;
		return;
	}



	function add_file($data, $name) 
	{
		$fp = fopen($data,"r");
		$data = fread($fp,filesize($data));
		fclose($fp);
		$name = str_replace("", "/", $name);
		$unc_len = strlen($data);
		$crc = crc32($data);
		$zdata = gzcompress($data);
		$zdata = substr ($zdata, 2, -4);
		$c_len = strlen($zdata);
		$fr = "\x50\x4b\x03\x04";
		$fr .= "\x14\x00";
		$fr .= "\x00\x00";
		$fr .= "\x08\x00";
		$fr .= "\x00\x00\x00\x00";
		$fr .= pack("V",$crc);
		$fr .= pack("V",$c_len);
		$fr .= pack("V",$unc_len);
		$fr .= pack("v", strlen($name) );
		$fr .= pack("v", 0 );
		$fr .= $name;
		$fr .= $zdata;
		$fr .= pack("V",$crc);
		$fr .= pack("V",$c_len);
		$fr .= pack("V",$unc_len);
		
		$this -> datasec[] = $fr;
		$new_offset = strlen(implode("", $this->datasec));
		
		$cdrec = "\x50\x4b\x01\x02";
		$cdrec .="\x00\x00";
		$cdrec .="\x14\x00";
		$cdrec .="\x00\x00";
		$cdrec .="\x08\x00";
		$cdrec .="\x00\x00\x00\x00";
		$cdrec .= pack("V",$crc);
		$cdrec .= pack("V",$c_len);
		$cdrec .= pack("V",$unc_len);
		$cdrec .= pack("v", strlen($name) );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("v", 0 );
		$cdrec .= pack("V", 32 );
		$cdrec .= pack("V", $this -> old_offset );
		
		$this -> old_offset = $new_offset;
		
		$cdrec .= $name;
		$this -> ctrl_dir[] = $cdrec;
	} 



	function file() 
	{
		$data = implode("", $this -> datasec);
		$ctrldir = implode("", $this -> ctrl_dir);
		
		return $data.$ctrldir.$this->eof_ctrl_dir.pack("v", sizeof($this -> ctrl_dir)) .
		pack("v", sizeof($this -> ctrl_dir)) .
		pack("V", strlen($ctrldir)) .
		pack("V", strlen($data)) ."\x00\x00";
	}


}

?>