zip.lib.php

我的一个网友写的PHP下面的zip类 最适合PHP做网上办公系统和提供网站管理程序。

<?
    /*------------------------------------------------------------
    *   Project:        WebKey3
    *   Description:    压缩文件操作类，可以压缩和解压缩ZIP文件。
    *   Author:         刘春福
    *   $Id: zip.lib.php,v 1.2 2004/09/22 03:25:24 lcf Exp $
    *------------------------------------------------------------*/

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 = $this->ReadCentralDir($zip,$zip_name);

        @rewind($zip);
        @fseek($zip, $centd['offset']);

        for ($i=0; $i<$centd['entries']; $i++)
        {
            $header = $this->ReadCentralFileHeaders($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($i=0;isset($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_File($data, $name, $compact = 1)
    {
        $name     = str_replace('\\', '/', $name);
        $dtime    = dechex($this->DosTime());

        $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 DosTime()
    {
        $timearray = getdate();
        if ($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);
    }

    function Extract ( $zn, $to, $index = Array(-1) )
    {
        $ok = 0; $zip = @fopen($zn,'rb');
        if(!$zip) return(-1);
        $cdir = $this->ReadCentralDir($zip,$zn);
        $pos_entry = $cdir['offset'];

        if(!is_array($index)){ $index = array($index); }
        for($i=0;isset($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 = $this->ReadCentralFileHeaders($zip);
            $header['index'] = $i;
            $pos_entry = ftell($zip);
            @rewind($zip);
            fseek($zip, $header['offset']);
            if(in_array("-1",$index)||in_array($i,$index))
                $stat[$header['filename']]=$this->ExtractFile($header, $to, $zip);
        }
        fclose($zip);
        return $stat;
    }

    function ReadFileHeader($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();