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now = time();
log_message('info', 'Zip Compression Class Initialized');
}
// --------------------------------------------------------------------
/**
* Add Directory
*
* Lets you add a virtual directory into which you can place files.
*
* @param mixed $directory the directory name. Can be string or array
* @return void
*/
public function add_dir($directory)
{
foreach ((array) $directory as $dir)
{
if ( ! preg_match('|.+/$|', $dir))
{
$dir .= '/';
}
$dir_time = $this->_get_mod_time($dir);
$this->_add_dir($dir, $dir_time['file_mtime'], $dir_time['file_mdate']);
}
}
// --------------------------------------------------------------------
/**
* Get file/directory modification time
*
* If this is a newly created file/dir, we will set the time to 'now'
*
* @param string $dir path to file
* @return array filemtime/filemdate
*/
protected function _get_mod_time($dir)
{
// filemtime() may return false, but raises an error for non-existing files
$date = file_exists($dir) ? getdate(filemtime($dir)) : getdate($this->now);
return array(
'file_mtime' => ($date['hours'] << 11) + ($date['minutes'] << 5) + $date['seconds'] / 2,
'file_mdate' => (($date['year'] - 1980) << 9) + ($date['mon'] << 5) + $date['mday']
);
}
// --------------------------------------------------------------------
/**
* Add Directory
*
* @param string $dir the directory name
* @param int $file_mtime
* @param int $file_mdate
* @return void
*/
protected function _add_dir($dir, $file_mtime, $file_mdate)
{
$dir = str_replace('\\', '/', $dir);
$this->zipdata .=
"\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V', 0) // crc32
.pack('V', 0) // compressed filesize
.pack('V', 0) // uncompressed filesize
.pack('v', self::strlen($dir)) // length of pathname
.pack('v', 0) // extra field length
.$dir
// below is "data descriptor" segment
.pack('V', 0) // crc32
.pack('V', 0) // compressed filesize
.pack('V', 0); // uncompressed filesize
$this->directory .=
"\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V',0) // crc32
.pack('V',0) // compressed filesize
.pack('V',0) // uncompressed filesize
.pack('v', self::strlen($dir)) // length of pathname
.pack('v', 0) // extra field length
.pack('v', 0) // file comment length
.pack('v', 0) // disk number start
.pack('v', 0) // internal file attributes
.pack('V', 16) // external file attributes - 'directory' bit set
.pack('V', $this->offset) // relative offset of local header
.$dir;
$this->offset = self::strlen($this->zipdata);
$this->entries++;
}
// --------------------------------------------------------------------
/**
* Add Data to Zip
*
* Lets you add files to the archive. If the path is included
* in the filename it will be placed within a directory. Make
* sure you use add_dir() first to create the folder.
*
* @param mixed $filepath A single filepath or an array of file => data pairs
* @param string $data Single file contents
* @return void
*/
public function add_data($filepath, $data = NULL)
{
if (is_array($filepath))
{
foreach ($filepath as $path => $data)
{
$file_data = $this->_get_mod_time($path);
$this->_add_data($path, $data, $file_data['file_mtime'], $file_data['file_mdate']);
}
}
else
{
$file_data = $this->_get_mod_time($filepath);
$this->_add_data($filepath, $data, $file_data['file_mtime'], $file_data['file_mdate']);
}
}
// --------------------------------------------------------------------
/**
* Add Data to Zip
*
* @param string $filepath the file name/path
* @param string $data the data to be encoded
* @param int $file_mtime
* @param int $file_mdate
* @return void
*/
protected function _add_data($filepath, $data, $file_mtime, $file_mdate)
{
$filepath = str_replace('\\', '/', $filepath);
$uncompressed_size = self::strlen($data);
$crc32 = crc32($data);
$gzdata = self::substr(gzcompress($data, $this->compression_level), 2, -4);
$compressed_size = self::strlen($gzdata);
$this->zipdata .=
"\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V', $crc32)
.pack('V', $compressed_size)
.pack('V', $uncompressed_size)
.pack('v', self::strlen($filepath)) // length of filename
.pack('v', 0) // extra field length
.$filepath
.$gzdata; // "file data" segment
$this->directory .=
"\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00"
.pack('v', $file_mtime)
.pack('v', $file_mdate)
.pack('V', $crc32)
.pack('V', $compressed_size)
.pack('V', $uncompressed_size)
.pack('v', self::strlen($filepath)) // length of filename
.pack('v', 0) // extra field length
.pack('v', 0) // file comment length
.pack('v', 0) // disk number start
.pack('v', 0) // internal file attributes
.pack('V', 32) // external file attributes - 'archive' bit set
.pack('V', $this->offset) // relative offset of local header
.$filepath;
$this->offset = self::strlen($this->zipdata);
$this->entries++;
$this->file_num++;
}
// --------------------------------------------------------------------
/**
* Read the contents of a file and add it to the zip
*
* @param string $path
* @param bool $archive_filepath
* @return bool
*/
public function read_file($path, $archive_filepath = FALSE)
{
if (file_exists($path) && FALSE !== ($data = file_get_contents($path)))
{
if (is_string($archive_filepath))
{
$name = str_replace('\\', '/', $archive_filepath);
}
else
{
$name = str_replace('\\', '/', $path);
if ($archive_filepath === FALSE)
{
$name = preg_replace('|.*/(.+)|', '\\1', $name);
}
}
$this->add_data($name, $data);
return TRUE;
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Read a directory and add it to the zip.
*
* This function recursively reads a folder and everything it contains (including
* sub-folders) and creates a zip based on it. Whatever directory structure
* is in the original file path will be recreated in the zip file.
*
* @param string $path path to source directory
* @param bool $preserve_filepath
* @param string $root_path
* @return bool
*/
public function read_dir($path, $preserve_filepath = TRUE, $root_path = NULL)
{
$path = rtrim($path, '/\\').DIRECTORY_SEPARATOR;
if ( ! $fp = @opendir($path))
{
return FALSE;
}
// Set the original directory root for child dir's to use as relative
if ($root_path === NULL)
{
$root_path = str_replace(array('\\', '/'), DIRECTORY_SEPARATOR, dirname($path)).DIRECTORY_SEPARATOR;
}
while (FALSE !== ($file = readdir($fp)))
{
if ($file[0] === '.')
{
continue;
}
if (is_dir($path.$file))
{
$this->read_dir($path.$file.DIRECTORY_SEPARATOR, $preserve_filepath, $root_path);
}
elseif (FALSE !== ($data = file_get_contents($path.$file)))
{
$name = str_replace(array('\\', '/'), DIRECTORY_SEPARATOR, $path);
if ($preserve_filepath === FALSE)
{
$name = str_replace($root_path, '', $name);
}
$this->add_data($name.$file, $data);
}
}
closedir($fp);
return TRUE;
}
// --------------------------------------------------------------------
/**
* Get the Zip file
*
* @return string (binary encoded)
*/
public function get_zip()
{
// Is there any data to return?
if ($this->entries === 0)
{
return FALSE;
}
// @see https://github.com/bcit-ci/CodeIgniter/issues/5864
$footer = $this->directory."\x50\x4b\x05\x06\x00\x00\x00\x00"
.pack('v', $this->entries) // total # of entries "on this disk"
.pack('v', $this->entries) // total # of entries overall
.pack('V', self::strlen($this->directory)) // size of central dir
.pack('V', self::strlen($this->zipdata)) // offset to start of central dir
."\x00\x00"; // .zip file comment length
return $this->zipdata.$footer;
}
// --------------------------------------------------------------------
/**
* Write File to the specified directory
*
* Lets you write a file
*
* @param string $filepath the file name
* @return bool
*/
public function archive($filepath)
{
if ( ! ($fp = @fopen($filepath, 'w+b')))
{
return FALSE;
}
flock($fp, LOCK_EX);
for ($result = $written = 0, $data = $this->get_zip(), $length = self::strlen($data); $written < $length; $written += $result)
{
if (($result = fwrite($fp, self::substr($data, $written))) === FALSE)
{
break;
}
}
flock($fp, LOCK_UN);
fclose($fp);
return is_int($result);
}
// --------------------------------------------------------------------
/**
* Download
*
* @param string $filename the file name
* @return void
*/
public function download($filename = 'backup.zip')
{
if ( ! preg_match('|.+?\.zip$|', $filename))
{
$filename .= '.zip';
}
get_instance()->load->helper('download');
$get_zip = $this->get_zip();
$zip_content =& $get_zip;
force_download($filename, $zip_content);
}
// --------------------------------------------------------------------
/**
* Initialize Data
*
* Lets you clear current zip data. Useful if you need to create
* multiple zips with different data.
*
* @return CI_Zip
*/
public function clear_data()
{
$this->zipdata = '';
$this->directory = '';
$this->entries = 0;
$this->file_num = 0;
$this->offset = 0;
return $this;
}
// --------------------------------------------------------------------
/**
* Byte-safe strlen()
*
* @param string $str
* @return int
*/
protected static function strlen($str)
{
return (self::$func_overload)
? mb_strlen($str, '8bit')
: strlen($str);
}
// --------------------------------------------------------------------
/**
* Byte-safe substr()
*
* @param string $str
* @param int $start
* @param int $length
* @return string
*/
protected static function substr($str, $start, $length = NULL)
{
if (self::$func_overload)
{
// mb_substr($str, $start, null, '8bit') returns an empty
// string on PHP 5.3
isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start);
return mb_substr($str, $start, $length, '8bit');
}
return isset($length)
? substr($str, $start, $length)
: substr($str, $start);
}
}