* @author Michael Slusarz * @category Horde * @license http://www.horde.org/licenses/lgpl21 LGPL 2.1 * @package Compress */ /** * This class allows rar files to be read. * * @author Michael Cochrane * @author Michael Slusarz * @category Horde * @copyright 2008-2017 Horde LLC * @license http://www.horde.org/licenses/lgpl21 LGPL 2.1 * @package Compress */ class Horde_Compress_Rar extends Horde_Compress_Base { const BLOCK_START = "\x52\x61\x72\x21\x1a\x07\x00"; /** */ public $canDecompress = true; /** * Rar compression methods * * @var array */ protected $_methods = array( 0x30 => 'Store', 0x31 => 'Fastest', 0x32 => 'Fast', 0x33 => 'Normal', 0x34 => 'Good', 0x35 => 'Best' ); /** * @return array Info on the compressed file: * 
     * KEY: Position in RAR archive
     * VALUES:
     *   attr - File attributes
     *   date - File modification time
     *   csize - Compressed file size
     *   method - Compression method
     *   name - Filename
     *   size - Original file size
     *
* * @throws Horde_Compress_Exception */ public function decompress($data, array $params = array()) { $blockStart = strpos($data, self::BLOCK_START); if ($blockStart === false) { throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data.")); } $data_len = strlen($data); $position = $blockStart + 7; $return_array = array(); while ($position < $data_len) { if ($position + 7 > $data_len) { throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data.")); } //$head_crc = substr($data, $position, 2); $head_type = ord(substr($data, $position + 2, 1)); $head_flags = unpack('vFlags', substr($data, $position + 3, 2)); $head_flags = $head_flags['Flags']; $head_size = unpack('vSize', substr($data, $position + 5, 2)); $head_size = $head_size['Size']; $position += 7; $head_size -= 7; switch ($head_type) { case 0x73: /* Archive header */ $position += $head_size; break; case 0x74: /* File Header */ $info = unpack( 'VPacked/VUnpacked/COS/VCRC32/VTime/CVersion/CMethod/vLength/vAttrib', substr($data, $position) ); $year = (($info['Time'] >> 25) & 0x7f) + 80; $name = substr($data, $position + 25, $info['Length']); if ($unicode = strpos($name, "\0")) { $name = substr($name, 0, $unicode); } $return_array[] = array( 'name' => $name, 'size' => $info['Unpacked'], 'csize' => $info['Packed'], 'date' => mktime( (($info['Time'] >> 11) & 0x1f), (($info['Time'] >> 5) & 0x3f), (($info['Time'] << 1) & 0x3e), (($info['Time'] >> 21) & 0x07), (($info['Time'] >> 16) & 0x1f), $year < 1900 ? $year + 1900 : $year ), 'method' => $this->_methods[$info['Method']], 'attr' => (($info['Attrib'] & 0x10) ? 'D' : '-') . (($info['Attrib'] & 0x20) ? 'A' : '-') . (($info['Attrib'] & 0x03) ? 'S' : '-') . (($info['Attrib'] & 0x02) ? 'H' : '-') . (($info['Attrib'] & 0x01) ? 'R' : '-') ); $position += $head_size + $info['Packed']; break; default: if ($head_size == -7) { /* We've already added 7 bytes above. If we remove those * same 7 bytes, we will enter an infinite loop. */ throw new Horde_Compress_Exception(Horde_Compress_Translation::t("Invalid RAR data.")); } $position += $head_size; break; } } return $return_array; } }