<?php
/**
 * Zip压缩类
 *
 * @version        $Id: zip.class.php 1 15:21 2010年7月5日 $
 * @package        DedeCMS.Libraries
 * @founder        IT柏拉图, https://weibo.com/itprato
 * @author         DedeCMS团队
 * @copyright      Copyright (c) 2007 - 2021, 上海卓卓网络科技有限公司 (DesDev, Inc.)
 * @license        http://help.dedecms.com/usersguide/license.html
 * @link           http://www.dedecms.com
 */
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(".");

    /**
     *  获取zip文件中的文件列表
     *
     * @access    public
     * @param     string  $zip_name  zip文件名
     * @return    array
     */
    function get_List($zip_name)
    {
        $ret = array();
        $zip = @fopen($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;
    }

    /**
     *  增加文件到压缩文件
     *
     * @access    public
     * @param     string  $files 需要增加的文件列表,可以是字符串也可以是数组
     * @param     string  $compact 压缩文件名称
     * @return    array  压缩文件信息
     */
    function Add($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;
    }

    /**
     *  获取文件,获取后可以让其进行下载
     *
     * @access    public
     * @return    void
     */
    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";
    }

    /**
     *  增加文件目录
     *
     * @access    public
     * @param     string  $name  目录名称
     * @return    void
     */
    function add_dir($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;
    }

    /**
     *  编译指定的文件为zip文件（filename可以为文件数组array、目录dir或单个文件file）
     *
     * @access    public
     * @param     string  $filename  文件名称
     * @param     string  $tozipfilename  压缩文件名称
     * @param     string  $ftype  压缩类型
     * @return    int  影响文件数
     */
    function CompileZipFile($filename, $tozipfilename,$ftype='dir')
    {
        if (@function_exists('gzcompress'))
        {
            if($ftype=='dir')
            {
                $filelist =  $this->ListDirFiles($filename);
            }
            else if($ftype=='file')
            {
                $filelist[] =  $filename;
            }
            else
            {
                $filelist =  $filename;
            }
            $i = 0;
            if(count($filelist)>0)
            {
                foreach($filelist as $filename)
                {
                    if (is_file($filename))
                    {
                        $i++;
                        $fd = fopen ($filename, "r");
                        if(filesize($filename)>0)
                        {
                            $content = fread($fd, filesize($filename));
                        }
                        else
                        {
                            $content = ' ';
                        }
                        fclose ($fd);

                        //if (is_array($dir)) $filename = basename($filename);
                        $this->add_File($content, $filename);
                    }
                }
                $out = $this->get_file();
                $fp = fopen($tozipfilename, "w");
                fwrite($fp, $out, strlen($out));
                fclose($fp);
            }
            return $i;
        }
        else
        {
            return 0;
        }
    }

    /**
     *  读取某文件夹的所有文件
     *
     * @access    public
     * @param     string  $dirname  目录名称
     * @return    mix  如果失败则返回false
     */
    function ListDirFiles($dirname)
    {
        $files = array();
        if(is_dir($dirname))
        {
            $fh = opendir($dirname);
            while (($file = readdir($fh)) !== false)
            {
                if (strcmp($file, '.')==0 || strcmp($file, '..')==0)
                {
                    continue;
                }
                $filepath = $dirname . '/' . $file;
                if ( is_dir($filepath) )
                {
                    $files = array_merge($files, $this->ListDirFiles($filepath));
                }
                else
                {
                    array_push($files, $filepath);
                }
            }
            closedir($fh);
        }
        else
        {
            $files = false;
        }
        return $files;
    }

    /**
     *  增加文件
     *
     * @access    public
     * @param     string  $data  数据
     * @param     string  $name  名称
     * @param     string  $compact  压缩
     * @return    string
     */
    function add_File($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;
    }

    /**
     *  返回时间
     *
     * @access    public
     * @return    int
     */
    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);
    }

    /**
     *  解压整个压缩包
     *  直接用 Extract 会有路径问题，本函数先从列表中获得文件信息并创建好所有目录然后才运行 Extract
     *
     * @access    public
     * @param     string  $zn zip文件名称
     * @param     string  $to 解压到的目录地址
     * @return    string
     */
    function ExtractAll ( $zn, $to)
    {
        if(substr($to,-1)!="/")
        {
            $to .= "/";
        }
        $files = $this->get_List($zn);
        $cn = count($files);
        if(is_array($files))
        {
            for($i=0;$i<$cn;$i++)
            {
                if($files[$i]['folder']==1)
                {
                    @mkdir($to.$files[$i]['filename'],$GLOBALS['cfg_dir_purview']);
                    @chmod($to.$files[$i]['filename'],$GLOBALS['cfg_dir_purview']);
                }
            }
        }
        $this->Extract ($zn,$to);
    }

    /**
     *  解压单个文件
     *
     * @access    public
     * @param     string  $zn zip文件名称
     * @param     string  $to 解压到的目录地址
     * @return    string
     */
    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();
        }
        $header['stored_filename'] = $header['filename'];
        $header['status'] = "ok";
        return $header;
    }

    function ReadCentralFileHeaders($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 ReadCentralDir($zip,$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) {
            $pos++;
            $byte = @fread($zip, 1);
            $bytes = (($bytes << 40) >> 32) | ord($byte);
            if (substr(dechex($bytes), -8, 8) == "504b0506") {
                break;
            }
        }
        $data = @unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',fread($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 ExtractFile($header,$to,$zip)
    {
        $header = $this->readfileheader($zip);
        $header['external'] = (!isset($header['external']) ? 0 : $header['external']);
        if(substr($to,-1)!="/")
        {
            $to.="/";
        }
        if(!@is_dir($to))
        {
            @mkdir($to,$GLOBALS['cfg_dir_purview']);
        }
        if (!($header['external']==0x41FF0010)&&!($header['external']==16))
        {
            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');
            }
        }
        return true;
    }
}