php 解压 zip

<?php
class n_zip
{

var $total_files = 0;
var $total_folders = 0;

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; $index[$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){
   $byte = @fread($zip, 1); $bytes=($bytes << 8) | ord($byte);
   if ($bytes == 0x504b0506 or $bytes == 0x2e706870504b0506){ $pos++;break;} $pos++;
}

$fdata=fread($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);

if(substr($to,-1)!="/") $to.="/";
if($to=='./') $to = ''; 
$pth = explode("/",$to.$header['filename']);
$mydir = '';
for($i=0;$i<count($pth)-1;$i++){
   if(!$pth[$i]) continue;
   $mydir .= $pth[$i]."/";
   if((!is_dir($mydir) && @mkdir($mydir,0777)) || (($mydir==$to.$header['filename'] || ($mydir==$to && $this->total_folders==0)) && is_dir($mydir)) ){
    @chmod($mydir,0777);
    $this->total_folders ++;
    //echo "<input name='dfile[]' type='checkbox' value='$mydir' checked> <a href='$mydir' target='_blank'>目录: $mydir</a><br>";
   }
}

if(strrchr($header['filename'],'/')=='/') return;

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.$header['filename'].'.gz','rb') or die("Cette archive est compress閑");
    if(!$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');
   
   }
}

$this->total_files ++;
//echo "<input name='dfile[]' type='checkbox' value='$to$header[filename]' checked> <a href='$to$header[filename]' target='_blank'>文件: $to$header[filename]</a><br>";

return true;
}

// end class
}
$z = new n_zip;
$z->Extract("Favorites.zip","./a/");
?>