<?php
namespace util;
/**
 * 文件压缩解压类
 */
class PHPZip {
    private $ctrl_dir     = array();
    private $datasec      = array();


    /**********************************************************
     * 压缩部分
     **********************************************************/
    // ------------------------------------------------------ //
    // #遍历指定文件夹
    //
    // $archive  = new PHPZip();
    // $filelist = $archive->visitFile(文件夹路径);
    // print "当前文件夹的文件:<p>\r\n";
    // foreach($filelist as $file)
    //     printf("%s<br>\r\n", $file);
    // ------------------------------------------------------ //
    var $fileList = array();
    public function visitFile($path)
    {
        global $fileList;
        $path = str_replace("\\", "/", $path);
        $fdir = dir($path);

        while(($file = $fdir->read()) !== false)
        {
            if($file == '.' || $file == '..'){ continue; }

            $pathSub    = preg_replace("*/{2,}*", "/", $path."/".$file);  // 替换多个反斜杠
            $fileList[] = is_dir($pathSub) ? $pathSub."/" : $pathSub;
            if(is_dir($pathSub)){ $this->visitFile($pathSub); }
        }
        $fdir->close();
        return $fileList;
    }

    private function unix2DosTime($unixtime = 0)
    {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);

        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);
    }

    var $old_offset = 0;
    private function addFile($data, $filename, $time = 0)
    {
        $filename = str_replace('\\', '/', $filename);

        $dtime    = dechex($this->unix2DosTime($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 . '";');

        $fr       = "\x50\x4b\x03\x04";
        $fr      .= "\x14\x00";
        $fr      .= "\x00\x00";
        $fr      .= "\x08\x00";
        $fr      .= $hexdtime;
        $unc_len  = strlen($data);
        $crc      = crc32($data);
        $zdata    = gzcompress($data);
        $c_len    = strlen($zdata);
        $zdata    = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
        $fr      .= pack('V', $crc);
        $fr      .= pack('V', $c_len);
        $fr      .= pack('V', $unc_len);
        $fr      .= pack('v', strlen($filename));
        $fr      .= pack('v', 0);
        $fr      .= $filename;

        $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 .= $hexdtime;
        $cdrec .= pack('V', $crc);
        $cdrec .= pack('V', $c_len);
        $cdrec .= pack('V', $unc_len);
        $cdrec .= pack('v', strlen($filename) );
        $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 .= $filename;
        $this->ctrl_dir[] = $cdrec;
    }

    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    private 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";
    }

    // ------------------------------------------------------ //
    // #压缩到服务器
    //
    // $archive = new PHPZip();
    // $archive->Zip("需压缩的文件所在目录", "ZIP压缩文件名");
    // ------------------------------------------------------ //
    public function Zip($dir, $saveName)
    {
        if(@!function_exists('gzcompress')){ return; }

        ob_end_clean();
        $filelist = $this->visitFile($dir);
        if(count($filelist) == 0){ return; }

        foreach($filelist as $file)
        {
            if(!file_exists($file) || !is_file($file)){ continue; }

            $fd       = fopen($file, "rb");
            $content  = @fread($fd, filesize($file));
            fclose($fd);

            // 1.删除$dir的字符(./folder/file.txt删除./folder/)
            // 2.如果存在/就删除(/file.txt删除/)
            $file = substr($file, strlen($dir));
            if(substr($file, 0, 1) == "\\" || substr($file, 0, 1) == "/"){ $file = substr($file, 1); }

            $this->addFile($content, $file);
        }
        $out = $this->file();

        $fp = fopen($saveName, "wb");
        fwrite($fp, $out, strlen($out));
        fclose($fp);
    }

    // ------------------------------------------------------ //
    // #压缩并直接下载
    //
    // $archive = new PHPZip();
    // $archive->ZipAndDownload("需压缩的文件所在目录");
    // ------------------------------------------------------ //
    public function ZipAndDownload($dir, $file_name = '')
    {
        if(@!function_exists('gzcompress')){ return; }

        ob_end_clean();
        $filelist = $this->visitFile($dir);
        if(count($filelist) == 0){ return; }

        foreach($filelist as $file)
        {
            if(!file_exists($file) || !is_file($file)){ continue; }

            $fd       = fopen($file, "rb");
            $content  = @fread($fd, filesize($file));
            fclose($fd);

            // 1.删除$dir的字符(./folder/file.txt删除./folder/)
            // 2.如果存在/就删除(/file.txt删除/)
            $file = substr($file, strlen($dir));
            if(substr($file, 0, 1) == "\\" || substr($file, 0, 1) == "/"){ $file = substr($file, 1); }

            $this->addFile($content, $file);
        }
        $out = $this->file();

        $file_name = $file_name == '' ? 'file_'.date("YmdHis", time()) : $file_name;

        @header('Content-Encoding: none');
        @header('Content-Type: application/zip');
        @header('Content-Disposition: attachment ; filename='.$file_name.'.zip');
        @header('Pragma: no-cache');
        @header('Expires: 0');
        print($out);
    }


    /**********************************************************
     * 解压部分
     **********************************************************/
    // ------------------------------------------------------ //
    // ReadCentralDir($zip, $zipfile)
    // $zip是经过@fopen($zipfile, 'rb')打开的
    // $zipfile是zip文件的路径
    // ------------------------------------------------------ //
    private function ReadCentralDir($zip, $zipfile)
    {
        $size     = filesize($zipfile);
        $max_size = ($size < 277) ? $size : 277;

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

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

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

        $centd['comment']      = ($data['comment_size'] != 0) ? fread($zip, $data['comment_size']) : '';  // 注释
        $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;
    }

    private 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);

        $header['filename'] = ($header['filename_len'] != 0) ? fread($zip, $header['filename_len']) : '';
        $header['extra']    = ($header['extra_len']    != 0) ? fread($zip, $header['extra_len'])    : '';
        $header['comment']  = ($header['comment_len']  != 0) ? fread($zip, $header['comment_len'])  : '';


        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; }  // 判断是否文件夹
        return $header;
    }

    private 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']);
        $header['extra']           = ($data['extra_len'] != 0) ? fread($zip, $data['extra_len']) : '';
        $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;
    }

    private function ExtractFile($header, $to, $zip)
    {
        $header = $this->readfileheader($zip);

        if(substr($to, -1) != "/"){ $to .= "/"; }
        if(!@is_dir($to)){ @mkdir($to, 0777); }

        $pth = explode("/", dirname($header['filename']));
        for($i=0; isset($pth[$i]); $i++){
            if(!$pth[$i]){ continue; }
            $pthss .= $pth[$i]."/";
            if(!is_dir($to.$pthss)){ @mkdir($to.$pthss, 0777); }
        }

        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;
    }

    // ------------------------------------------------------ //
    // #解压文件
    //
    // $archive   = new PHPZip();
    // $zipfile   = "ZIP压缩文件名";
    // $savepath  = "解压缩目录名";
    // $zipfile   = $unzipfile;
    // $savepath  = $unziptarget;
    // $array     = $archive->GetZipInnerFilesInfo($zipfile);
    // $filecount = 0;
    // $dircount  = 0;
    // $failfiles = array();
    // set_time_limit(0);  // 修改为不限制超时时间(默认为30秒)
    //
    // for($i=0; $i<count($array); $i++) {
    //     if($array[$i][folder] == 0){
    //         if($archive->unZip($zipfile, $savepath, $i) > 0){
    //             $filecount++;
    //         }else{
    //             $failfiles[] = $array[$i][filename];
    //         }
    //     }else{
    //         $dircount++;
    //     }
    // }
    // set_time_limit(30);
    //printf("文件夹:%d&nbsp;&nbsp;&nbsp;&nbsp;解压文件:%d&nbsp;&nbsp;&nbsp;&nbsp;失败:%d<br>\r\n", $dircount, $filecount, count($failfiles));
    //if(count($failfiles) > 0){
    //    foreach($failfiles as $file){
    //        printf("&middot;%s<br>\r\n", $file);
    //    }
    //}
    // ------------------------------------------------------ //
    public function unZip($zipfile, $to, $index = Array(-1))
    {
        $ok  = 0;
        $zip = @fopen($zipfile, 'rb');
        if(!$zip){ return(-1); }

        $cdir      = $this->ReadCentralDir($zip, $zipfile);
        $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          = $this->ReadCentralFileHeaders($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;
    }


    /**********************************************************
     * 其它部分
     **********************************************************/
    // ------------------------------------------------------ //
    // #获取被压缩文件的信息
    //
    // $archive = new PHPZip();
    // $array = $archive->GetZipInnerFilesInfo(ZIP压缩文件名);
    // for($i=0; $i<count($array); $i++) {
    //     printf("<b>&middot;%s</b><br>\r\n", $array[$i][filename]);
    //     foreach($array[$i] as $key => $value)
    //         printf("%s => %s<br>\r\n", $key, $value);
    //     print "\r\n<p>------------------------------------<p>\r\n\r\n";
    // }
    // ------------------------------------------------------ //
    public function GetZipInnerFilesInfo($zipfile)
    {
        $zip = @fopen($zipfile, 'rb');
        if(!$zip){ return(0); }
        $centd = $this->ReadCentralDir($zip, $zipfile);

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

        for($i=0; $i<$centd['entries']; $i++)
        {
            $header          = $this->ReadCentralFileHeaders($zip);
            $header['index'] = $i;
            $info = array(
                'filename'        => $header['filename'],                   // 文件名
                'stored_filename' => $header['stored_filename'],            // 压缩后文件名
                'size'            => $header['size'],                       // 大小
                'compressed_size' => $header['compressed_size'],            // 压缩后大小
                'crc'             => strtoupper(dechex($header['crc'])),    // CRC32
                'mtime'           => date("Y-m-d H:i:s",$header['mtime']),  // 文件修改时间
                'comment'         => $header['comment'],                    // 注释
                'folder'          => ($header['external'] == 0x41FF0010 || $header['external'] == 16) ? 1 : 0,  // 是否为文件夹
                'index'           => $header['index'],                      // 文件索引
                'status'          => $header['status']                      // 状态
            );
            $ret[] = $info;
            unset($header);
        }
        fclose($zip);
        return $ret;
    }

    // ------------------------------------------------------ //
    // #获取压缩文件的注释
    //
    // $archive = new PHPZip();
    // echo $archive->GetZipComment(ZIP压缩文件名);
    // ------------------------------------------------------ //
    public function GetZipComment($zipfile)
    {
        $zip = @fopen($zipfile, 'rb');
        if(!$zip){ return(0); }
        $centd = $this->ReadCentralDir($zip, $zipfile);
        fclose($zip);
        return $centd[comment];
    }
}
