Greenter\Zip\ZipFile

Complexity

Total Complexity

5

Size/Duplication

Total Lines	139
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	0

Test Coverage

Coverage

89.55%

Importance

Changes

0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	addFile()	0	49	1
A	file()	0	16	1
A	unix2DosTime()	0	18	3

<?php
/**
 * Created by PhpStorm.
 * User: Giansalex
 * Date: 16/07/2017
 * Time: 13:00.
 */

namespace Greenter\Zip;

/**
 * Class ZipFile.
 */
class ZipFile
{
    /**
     * Array to store compressed data.
     *
     * @private  array    $datasec
     */
    private $datasec = [];
    /**
     * Central directory.
     *
     * @private  array    $ctrl_dir
     */
    private $ctrl_dir = [];
    /**
     * End of central directory record.
     *
     * @private  string   $eof_ctrl_dir
     */
    private $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    /**
     * Last offset position.
     *
     * @private  integer  $old_offset
     */
    private $old_offset = 0;

    /**
     * Converts an Unix timestamp to a four byte DOS date and time format (date
     * in high two bytes, time in low two bytes allowing magnitude comparison).
     *
     * @param int $unixtime the current Unix timestamp
     *
     * @return int the current date in a four byte DOS format
     */
    public function unix2DosTime($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;
            $timearray['seconds'] = 0;
        } // end if
        return (($timearray['year'] - 1980) << 25)
            | ($timearray['mon'] << 21)
            | ($timearray['mday'] << 16)
            | ($timearray['hours'] << 11)
            | ($timearray['minutes'] << 5)
            | ($timearray['seconds'] >> 1);
    }

 // end of the 'unix2DosTime()' method

    /**
     * Adds "file" to archive.
     *
     * @param string $data file contents
     * @param string $name name of the file in the archive (may contains the path)
     * @param int    $time the current timestamp
     */
    public function addFile($data, $name, $time = 0)
    {
        $name = str_replace('\\', '/', $name);
        $hexdtime = pack('V', $this->unix2DosTime($time));
        $frd = "\x50\x4b\x03\x04";
        $frd .= "\x14\x00";            // ver needed to extract
        $frd .= "\x00\x00";            // gen purpose bit flag
        $frd .= "\x08\x00";            // compression method
        $frd .= $hexdtime;             // last mod time and date
        // "local file header" segment
        $unc_len = strlen($data);
        $crc = crc32($data);
        $zdata = gzcompress($data);
        $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $c_len = strlen($zdata);
        $frd .= pack('V', $crc);             // crc32
        $frd .= pack('V', $c_len);           // compressed filesize
        $frd .= pack('V', $unc_len);         // uncompressed filesize
        $frd .= pack('v', strlen($name));    // length of filename
        $frd .= pack('v', 0);                // extra field length
        $frd .= $name;
        // "file data" segment
        $frd .= $zdata;
        // echo this entry on the fly, ...
        $this->datasec[] = $frd;
        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00";                // version made by
        $cdrec .= "\x14\x00";                // version needed to extract
        $cdrec .= "\x00\x00";                // gen purpose bit flag
        $cdrec .= "\x08\x00";                // compression method
        $cdrec .= $hexdtime;                 // last mod time & date
        $cdrec .= pack('V', $crc);           // crc32
        $cdrec .= pack('V', $c_len);         // compressed filesize
        $cdrec .= pack('V', $unc_len);       // uncompressed filesize
        $cdrec .= pack('v', strlen($name)); // length of filename
        $cdrec .= pack('v', 0);             // extra field length
        $cdrec .= pack('v', 0);             // file comment length
        $cdrec .= pack('v', 0);             // disk number start
        $cdrec .= pack('v', 0);             // internal file attributes
        $cdrec .= pack('V', 32);            // external file attributes
        // - 'archive' bit set
        $cdrec .= pack('V', $this->old_offset); // relative offset of local header
        $this->old_offset += strlen($frd);
        $cdrec .= $name;
        // optional extra field, file comment goes here
        // save to central directory
        $this->ctrl_dir[] = $cdrec;
    }

 // end of the 'addFile()' method

    /**
     * Echo central dir if ->doWrite==true, else build string to return.
     *
     * @return string if ->doWrite {empty string} else the ZIP file contents
     */
    public function file()
    {
        $ctrldir = implode('', $this->ctrl_dir);
        $header = $ctrldir.
            $this->eof_ctrl_dir.
            pack('v', sizeof($this->ctrl_dir)). //total #of entries "on this disk"
            pack('v', sizeof($this->ctrl_dir)). //total #of entries overall
            pack('V', strlen($ctrldir)).          //size of central dir
            pack('V', $this->old_offset).       //offset to start of central dir
            "\x00\x00";                            //.zip file comment length

        // Return entire ZIP archive as string
        $data = implode('', $this->datasec);

        return $data.$header;
    }

 // end of the 'file()' method
}