<?
/*=============================================================*\
PHP gzip compress class
@author hj@Dvbbs.php
@Date   2007-12-08
\*=============================================================*/
class zip
{
	var $datasec, $ctrl_dir = array();
	var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
	var $old_offset = 0;
	var $dirs = Array(".");

	function get_list($zip_name)
	{
		$zip = @fopen($zip_name, 'rb');
		if(!$zip) return(0);
		$centd = $this->read_central_dir($zip,$zip_name);
		@rewind($zip);
		@fseek($zip, $centd['offset']);
		for ($i=0; $i<$centd['entries']; $i++)
		{
			$header = $this->read_central_file_headers($zip);
			$header['index'] = $i;$info['filename'] = $header['filename'];
			$info['stored_filename'] = $header['stored_filename'];
			$info['size'] = $header['size'];$info['compressed_size']=$header['compressed_size'];
			$info['crc'] = strtoupper(dechex( $header['crc'] ));
			$info['mtime'] = $header['mtime']; $info['comment'] = $header['comment'];
			$info['folder'] = ($header['external']==0x41FF0010||$header['external']==16)?1:0;
			$info['index'] = $header['index'];$info['status'] = $header['status'];
			$ret[]=$info;
			unset($header);
		}
		return $ret;
	}

	function add($files,$compact)
	{
		if(!is_array($files[0])) $files=Array($files);
		for($i=0;$files[$i];$i++){
			$fn = $files[$i];
			if(!in_array(dirname($fn[0]),$this->dirs))
			$this->add_dir(dirname($fn[0]));
			if(basename($fn[0]))
			$ret[basename($fn[0])]=$this->add_file($fn[1],$fn[0],$compact);
		}
		return $ret;
	}

	function get_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";
	}

	function add_dir($name)
	{
		$name = str_replace("\\", "/", $name);
		$fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";

		$fr .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) );
		$fr .= pack("v", 0 ).$name.pack("V", 0).pack("V", 0).pack("V", 0);
		$this -> datasec[] = $fr;

		$new_offset = strlen(implode("", $this->datasec));

		$cdrec = "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";
		$cdrec .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) );
		$cdrec .= pack("v", 0 ).pack("v", 0 ).pack("v", 0 ).pack("v", 0 );
		$ext = "\xff\xff\xff\xff";
		$cdrec .= pack("V", 16 ).pack("V", $this -> old_offset ).$name;

		$this -> ctrl_dir[] = $cdrec;
		$this -> old_offset = $new_offset;
		$this -> dirs[] = $name;
	}

	function add_from_dir($path,$zippath='',$recursive=true,$compact = 1,$exts=''){	
		if(false!==($fdh = opendir($path))){
			$zippath&&(substr($zippath,-1,1)!='/')&&($zippath.='/');
			while($entry = readdir($fdh)) {
				if($entry != '.' && $entry != '..') {
					$f=$path."/".$entry;
					if(is_dir($f)){
						if($recursive)$this->add_from_dir($f,$zippath.$entry,true,$compact,$exts);
					}else{
						$ext=strtolower($this->getfileextname($f));
						if(false!=strpos($exts,$ext)||!$exts)$this->add_from_file($f,$zippath.$entry,$compact);
					}
				}
			}
		}
	}

	function add_from_file($filename,$zipfilename='',$compact = 1){
		if(!$fp=fopen($filename,'rb'))return false;
		$data=fread($fp,filesize($filename));
		(!$zipfilename)&&($zipfilename=$filename);
		$this->add_file($data,$zipfilename,$compact);
	}
	function add_file($data, $name, $compact = 1)
	{
		$name     = str_replace('\\', '/', $name);
		$dtime    = dechex($this->dos_time());

		$hexdtime = '\x' . $dtime[6] . $dtime[7].'\x'.$dtime[4] . $dtime[5]
		. '\x' . $dtime[2] . $dtime[3].'\x'.$dtime[0].$dtime[1];
		eval('$hexdtime = "' . $hexdtime . '";');

		if($compact)
		$fr = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00".$hexdtime;
		else $fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00".$hexdtime;
		$unc_len = strlen($data);
		$crc = crc32($data);

		if($compact){
			$zdata = gzcompress($data); $c_len = strlen($zdata);
			$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
		}else{
			$zdata = $data;
		}
		$c_len=strlen($zdata);
		$fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
		$fr .= pack('v', strlen($name)).pack('v', 0).$name.$zdata;

		$fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);

		$this -> datasec[] = $fr;
		$new_offset        = strlen(implode('', $this->datasec));
		if($compact)
		$cdrec = "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00";
		else $cdrec = "\x50\x4b\x01\x02\x14\x00\x0a\x00\x00\x00\x00\x00";
		$cdrec .= $hexdtime.pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
		$cdrec .= pack('v', strlen($name) ).pack('v', 0 ).pack('v', 0 );
		$cdrec .= pack('v', 0 ).pack('v', 0 ).pack('V', 32 );
		$cdrec .= pack('V', $this -> old_offset );

		$this -> old_offset = $new_offset;
		$cdrec .= $name;
		$this -> ctrl_dir[] = $cdrec;
		return true;
	}

	function dos_time() {
		$timearray = getdate();
		if ($timearray['year'] < 1980) {
			$timearray['year'] = 1980; $timearray['mon'] = 1;
			$timearray['mday'] = 1; $timearray['hours'] = 0;
			$timearray['minutes'] = 0; $timearray['seconds'] = 0;
		}
		return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) |     ($timearray['mday'] << 16) | ($timearray['hours'] << 11) |
		($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
	}

	//$overwrite覆盖选项 0:不覆盖  1:文件修改时间小于覆盖 2:创建时间于小覆盖  4:访问时间小于覆盖  7:无条件覆盖
	function extract ( $zn, $to,$overwrite=0, $index = Array(-1))
	{
		$ok = 0;
		$zip = @fopen($zn,'rb');
		if($to&&substr($to,-1)!="/") $to.="/";
		if(!$zip) return(-1);
		$cdir = $this->read_central_dir($zip,$zn);
		$pos_entry = $cdir['offset'];

		if(!is_array($index)){ $index = array($index);  }
		for($i=0; $index[$i];$i++){
			if(intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])
			return(-1);
		}

		for ($i=0; $i<$cdir['entries']; $i++)
		{
			@fseek($zip, $pos_entry);
			$header = $this->read_central_file_headers($zip);
			$header['index'] = $i;
			$pos_entry = ftell($zip);
			@rewind($zip);
			fseek($zip, $header['offset']);

			if($overwrite!=7&&file_exists($to.$header['filename'])){
				if(!$overwrite)continue;
				clearstatcache();
				$fstat=@stat($to.$header['filename']);
				if(!$overwrite){
					continue;
				}
				if(($overwrite&1)&&$fstat['mtime']>=$header['mtime']){
					continue;
				}
				if(($overwrite&2)&&$fstat['ctime']>=$header['ctime']){
					continue;
				}
				if(($overwrite&4)&&$fstat['atime']>=$header['ctime']){
					continue;
				}
			}

			if(in_array("-1",$index)||in_array($i,$index))
			$stat[$header['filename']]=$this->extract_file($header, $to, $zip);

		}
		fclose($zip);
		return $stat;
	}

	function read_file_header($zip)
	{
		$binary_data = fread($zip, 30);
		$data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);

		$header['filename'] = fread($zip, $data['filename_len']);
		if ($data['extra_len'] != 0) {
			$header['extra'] = fread($zip, $data['extra_len']);
		} else { $header['extra'] = ''; }

		$header['compression'] = $data['compression'];$header['size'] = $data['size'];
		$header['compressed_size'] = $data['compressed_size'];
		$header['crc'] = $data['crc']; $header['flag'] = $data['flag'];
		$header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];

		if ($header['mdate'] && $header['mtime']){
			$hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0x07E0)>>5;
			$seconde=($header['mtime']&0x001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
			$month=($header['mdate']&0x01E0)>>5;$day=$header['mdate']&0x001F;
			$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
		}else{$header['mtime'] = time();}

		$header['stored_filename'] = $header['filename'];
		$header['status'] = "ok";
		return $header;
	}

	function read_central_file_headers($zip){
		$binary_data = fread($zip, 46);
		$header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);

		if ($header['filename_len'] != 0)
		$header['filename'] = fread($zip,$header['filename_len']);
		else $header['filename'] = '';

		if ($header['extra_len'] != 0)
		$header['extra'] = fread($zip, $header['extra_len']);
		else $header['extra'] = '';

		if ($header['comment_len'] != 0)
		$header['comment'] = fread($zip, $header['comment_len']);
		else $header['comment'] = '';

		if ($header['mdate'] && $header['mtime'])
		{
			$hour = ($header['mtime'] & 0xF800) >> 11;
			$minute = ($header['mtime'] & 0x07E0) >> 5;
			$seconde = ($header['mtime'] & 0x001F)*2;
			$year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
			$month = ($header['mdate'] & 0x01E0) >> 5;
			$day = $header['mdate'] & 0x001F;
			$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
		} else {
			$header['mtime'] = time();
		}
		$header['stored_filename'] = $header['filename'];
		$header['status'] = 'ok';
		if (substr($header['filename'], -1) == '/')
		$header['external'] = 0x41FF0010;
		return $header;
	}

	function read_central_dir($zip,$zip_name)
	{
		$size = filesize($zip_name);
		if ($size < 277) $maximum_size = $size;
		else $maximum_size=277;

		@fseek($zip, $size-$maximum_size);
		$pos = ftell($zip);
		$bytes = 0x00000000;

		while ($pos < $size)
		{
			$byte = @fread($zip, 1); $bytes=($bytes << 8) | Ord($byte);
			if ($bytes == 0x504b0506){ $pos++; break; } $pos++;
		}

		$data=unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',fread($zip,18));


		if ($data['comment_size'] != 0)
		$centd['comment'] = fread($zip,$data['comment_size']);
		else $centd['comment'] = ''; $centd['entries'] = $data['entries'];
		$centd['disk_entries'] = $data['disk_entries'];
		$centd['offset'] = $data['offset'];$centd['disk_start'] = $data['disk_start'];
		$centd['size'] = $data['size'];  $centd['disk'] = $data['disk'];
		return $centd;
	}

	function createdir($pth,$mod=0777){
		$pth = explode("/",$pth);
		for($i=0;isset($pth[$i]);$i++){
			if(!$pth[$i]) continue;$pthss.=$pth[$i]."/";
			if(!is_dir($pthss))@mkdir($pthss,$mod);
		}
	}

	function getfileextname($filename){
		$ext='';
		if(false!==($pos=strrpos($filename,'.')))$ext=substr($filename,$pos+1);
		return $ext;
	}

	function extract_file($header,$to,$zip)
	{
		$isfolder=($header['external']==0x41FF0010)||($header['external']==16);
		$header = $this->read_file_header($zip);
		if($to&&substr($to,-1)!="/") $to.="/";
		if($to&&(!@is_dir($to)))$this->createdir($to,0777);
		$pth = $to.dirname($header['filename']);
		if(!@is_dir($pth))$this->createdir($pth,0777);
		if (!$isfolder)
		{
			if ($header['compression']==0)
			{
				$fp = @fopen($to.$header['filename'], 'wb');
				if(!$fp) return(-1);
				$size = $header['compressed_size'];

				while ($size != 0)
				{
					$read_size = ($size < 2048 ? $size : 2048);
					$buffer = fread($zip, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}
				fclose($fp);
				touch($to.$header['filename'], $header['mtime']);

			}else{
				$fp = @fopen($to.$header['filename'].'.gz','wb');
				if(!$fp) return(-1);
				$binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),
				Chr(0x00), time(), Chr(0x00), Chr(3));

				fwrite($fp, $binary_data, 10);
				$size = $header['compressed_size'];

				while ($size != 0)
				{
					$read_size = ($size < 1024 ? $size : 1024);
					$buffer = fread($zip, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}

				$binary_data = pack('VV', $header['crc'], $header['size']);
				fwrite($fp, $binary_data,8); fclose($fp);

				$gzp = @gzopen($to.$header['filename'].'.gz','rb') or die("Cette archive est compress");
				if(!$gzp) return(-2);
				$fp = @fopen($to.$header['filename'],'wb');
				if(!$fp) return(-1);
				$size = $header['size'];

				while ($size != 0)
				{
					$read_size = ($size < 2048 ? $size : 2048);
					$buffer = gzread($gzp, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}
				fclose($fp); gzclose($gzp);

				touch($to.$header['filename'], $header['mtime']);
				@unlink($to.$header['filename'].'.gz');

			}
		}else{
			$this->createdir($to.$header['filename']);
		}
		return true;
	}
}
?> 
