diff options
Diffstat (limited to 'hugo/libraries/zip.lib.php')
| -rw-r--r-- | hugo/libraries/zip.lib.php | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/hugo/libraries/zip.lib.php b/hugo/libraries/zip.lib.php new file mode 100644 index 0000000..6ecea2f --- /dev/null +++ b/hugo/libraries/zip.lib.php @@ -0,0 +1,216 @@ +<?php +/* vim: set expandtab sw=4 ts=4 sts=4: */ +/** + * Zip file creation + * + * @package PhpMyAdmin + */ +if (! defined('PHPMYADMIN')) { + exit; +} + +/** + * Zip file creation class. + * Makes zip files. + * + * @access public + * @package PhpMyAdmin + * @see Official ZIP file format: http://www.pkware.com/support/zip-app-note + */ +class ZipFile +{ + /** + * Whether to echo zip as it's built or return as string from -> file + * + * @var boolean $doWrite + */ + var $doWrite = false; + + /** + * Array to store compressed data + * + * @var array $datasec + */ + var $datasec = array(); + + /** + * Central directory + * + * @var array $ctrl_dir + */ + var $ctrl_dir = array(); + + /** + * End of central directory record + * + * @var string $eof_ctrl_dir + */ + var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; + + /** + * Last offset position + * + * @var integer $old_offset + */ + var $old_offset = 0; + + + /** + * Sets member variable this -> doWrite to true + * - Should be called immediately after class instantiantion + * - If set to true, then ZIP archive are echo'ed to STDOUT as each + * file is added via this -> addfile(), and central directories are + * echoed to STDOUT on final call to this -> file(). Also, + * this -> file() returns an empty string so it is safe to issue a + * "echo $zipfile;" command + * + * @access public + * + * @return void + */ + function setDoWrite() + { + $this -> doWrite = true; + } // end of the 'setDoWrite()' method + + /** + * 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 integer $unixtime the current Unix timestamp + * + * @return integer the current date in a four byte DOS format + * + * @access private + */ + function unix2DosTime($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; + $timearray['seconds'] = 0; + } // end if + + return (($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 integer $time the current timestamp + * + * @access public + * + * @return void + */ + function addFile($data, $name, $time = 0) + { + $name = str_replace('\\', '/', $name); + + $dtime = substr("00000000" . dechex($this->unix2DosTime($time)), -8); + $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"; // ver needed to extract + $fr .= "\x00\x00"; // gen purpose bit flag + $fr .= "\x08\x00"; // compression method + $fr .= $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); + $fr .= pack('V', $crc); // crc32 + $fr .= pack('V', $c_len); // compressed filesize + $fr .= pack('V', $unc_len); // uncompressed filesize + $fr .= pack('v', strlen($name)); // length of filename + $fr .= pack('v', 0); // extra field length + $fr .= $name; + + // "file data" segment + $fr .= $zdata; + + // echo this entry on the fly, ... + if ( $this -> doWrite) { + echo $fr; + } else { // ... OR add this entry to array + $this -> datasec[] = $fr; + } + + // 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 + $this -> old_offset += strlen($fr); + + $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 + * + * @access 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 + + if ( $this -> doWrite ) { // Send central directory & end ctrl dir to STDOUT + echo $header; + return ""; // Return empty string + } else { // Return entire ZIP archive as string + $data = implode('', $this -> datasec); + return $data . $header; + } + } // end of the 'file()' method + +} // end of the 'ZipFile' class +?> |