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<?php |
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/* |
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******************************************************* |
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*** *** |
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*** backpack *** |
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*** Cedric MONTUY pour CHG-WEB *** |
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*** Original author : Yoshi Sakai *** |
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*** *** |
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******************************************************* |
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*/ |
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class zipfile |
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{ |
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public $datasec = []; |
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public $ctrl_dir = []; |
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public $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; |
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public $old_offset = 0; |
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public function __construct() |
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{ |
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} |
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protected function unix2DosTime($unixtime = 0) |
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{ |
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$timearray = (0 == $unixtime) ? getdate() : getdate($unixtime); |
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if ($timearray['year'] < 1980) { |
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$timearray['year'] = 1980; |
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$timearray['mon'] = 1; |
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$timearray['mday'] = 1; |
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$timearray['hours'] = 0; |
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$timearray['minutes'] = 0; |
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$timearray['seconds'] = 0; |
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} // end if |
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return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1); |
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} // end of the 'unix2DosTime()' method |
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public function addFile($data, $name, $time = 0) |
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{ |
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$name = str_replace('\\', '/', $name); |
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$dtime = dechex($this->unix2DosTime($time)); |
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$hexdtime = '\x' . $dtime[6] . $dtime[7] . '\x' . $dtime[4] . $dtime[5] . '\x' . $dtime[2] . $dtime[3] . '\x' . $dtime[0] . $dtime[1]; |
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eval('$hexdtime = \'' . $hexdtime . '\';'); |
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$fr = "\x50\x4b\x03\x04"; |
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$fr .= "\x14\x00"; // ver needed to extract |
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$fr .= "\x00\x00"; // gen purpose bit flag |
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$fr .= "\x08\x00"; // compression method |
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$fr .= $hexdtime; // last mod time and date |
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// "local file header" segment |
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$unc_len = strlen($data); |
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$crc = crc32($data); |
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$zdata = gzcompress($data); |
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$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug |
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$c_len = strlen($zdata); |
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$fr .= pack('V', $crc); // crc32 |
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$fr .= pack('V', $c_len); // compressed filesize |
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$fr .= pack('V', $unc_len); // uncompressed filesize |
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$fr .= pack('v', strlen($name)); // length of filename |
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$fr .= pack('v', 0); // extra field length |
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$fr .= $name; |
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// "file data" segment |
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$fr .= $zdata; |
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// "data descriptor" segment (optional but necessary if archive is not |
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// served as file) |
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$fr .= pack('V', $crc); // crc32 |
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$fr .= pack('V', $c_len); // compressed filesize |
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$fr .= pack('V', $unc_len); // uncompressed filesize |
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// add this entry to array |
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$this->datasec[] = $fr; |
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$new_offset = strlen(implode('', $this->datasec)); |
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// now add to central directory record |
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$cdrec = "\x50\x4b\x01\x02"; |
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$cdrec .= "\x00\x00"; // version made by |
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$cdrec .= "\x14\x00"; // version needed to extract |
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$cdrec .= "\x00\x00"; // gen purpose bit flag |
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$cdrec .= "\x08\x00"; // compression method |
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$cdrec .= $hexdtime; // last mod time & date |
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$cdrec .= pack('V', $crc); // crc32 |
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$cdrec .= pack('V', $c_len); // compressed filesize |
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$cdrec .= pack('V', $unc_len); // uncompressed filesize |
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$cdrec .= pack('v', strlen($name)); // length of filename |
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$cdrec .= pack('v', 0); // extra field length |
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$cdrec .= pack('v', 0); // file comment length |
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$cdrec .= pack('v', 0); // disk number start |
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$cdrec .= pack('v', 0); // internal file attributes |
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$cdrec .= pack('V', 32); // external file attributes - 'archive' bit set |
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$cdrec .= pack('V', $this->old_offset); // relative offset of local header |
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$this->old_offset = $new_offset; |
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$cdrec .= $name; |
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// optional extra field, file comment goes here |
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// save to central directory |
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$this->ctrl_dir[] = $cdrec; |
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} // end of the 'addFile()' method |
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public function file() |
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{ |
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$data = implode('', $this->datasec); |
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$ctrldir = implode('', $this->ctrl_dir); |
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return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', count($this->ctrl_dir)) . // total # of entries "on this disk" |
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pack('v', count($this->ctrl_dir)) . // total # of entries overall |
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pack('V', strlen($ctrldir)) . // size of central dir |
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pack('V', strlen($data)) . // offset to start of central dir |
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"\x00\x00"; // .zip file comment length |
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} // end of the 'file()' method |
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} // end of the 'zipfile' class |
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XoopsModules25x /
backpack
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