压缩、解压缩类

<?php
// created by bouchon
// http://dev.maxg.info

// need help ? http://forum.maxg.info
class ziplib{
    var $datasec      = array();
    var $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($i=0;$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; $index[$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){
                $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 $centd;
    }
function extractfile($header,$to,$zip){
        $header = $this->readfileheader($zip);
        if(substr($to,-1)!="/"){
            $to.="/";
        }
        if([email protected]_dir($to)){
            @mkdir($to,0777);
        }
        $pth = explode("/",dirname($header['filename']));
        for($i=0;isset($pth[$i]);$i++){
            if(!$pth[$i]){
                continue;
            }
            if(!is_dir($to.$pth[$i])){
                @mkdir($to.$pth[$i],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;
    }
}

?>