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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at https://github.com/JamesHeinrich/getID3 //
// or https://www.getid3.org //
// or http://getid3.sourceforge.net //
// see readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.archive.tar.php //
// module for analyzing TAR files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
// //
// Module originally written by //
// Mike Mozolin <teddybearØmail*ru> //
// //
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
class getid3_tar extends getid3_handler
{
/**
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'tar';
$info['tar']['files'] = array();
$unpack_header = 'a100fname/a8mode/a8uid/a8gid/a12size/a12mtime/a8chksum/a1typflag/a100lnkname/a6magic/a2ver/a32uname/a32gname/a8devmaj/a8devmin/a155prefix';
$null_512k = str_repeat("\x00", 512); // end-of-file marker
$this->fseek(0);
while (!feof($this->getid3->fp)) {
$buffer = $this->fread(512);
if (strlen($buffer) < 512) {
break;
}
// check the block
$checksum = 0;
for ($i = 0; $i < 148; $i++) {
$checksum += ord($buffer[$i]);
}
for ($i = 148; $i < 156; $i++) {
$checksum += ord(' ');
}
for ($i = 156; $i < 512; $i++) {
$checksum += ord($buffer[$i]);
}
$attr = unpack($unpack_header, $buffer);
$name = (isset($attr['fname'] ) ? trim($attr['fname'] ) : '');
$mode = octdec(isset($attr['mode'] ) ? trim($attr['mode'] ) : '');
$uid = octdec(isset($attr['uid'] ) ? trim($attr['uid'] ) : '');
$gid = octdec(isset($attr['gid'] ) ? trim($attr['gid'] ) : '');
$size = octdec(isset($attr['size'] ) ? trim($attr['size'] ) : '');
$mtime = octdec(isset($attr['mtime'] ) ? trim($attr['mtime'] ) : '');
$chksum = octdec(isset($attr['chksum'] ) ? trim($attr['chksum'] ) : '');
$typflag = (isset($attr['typflag']) ? trim($attr['typflag']) : '');
$lnkname = (isset($attr['lnkname']) ? trim($attr['lnkname']) : '');
$magic = (isset($attr['magic'] ) ? trim($attr['magic'] ) : '');
$ver = (isset($attr['ver'] ) ? trim($attr['ver'] ) : '');
$uname = (isset($attr['uname'] ) ? trim($attr['uname'] ) : '');
$gname = (isset($attr['gname'] ) ? trim($attr['gname'] ) : '');
$devmaj = octdec(isset($attr['devmaj'] ) ? trim($attr['devmaj'] ) : '');
$devmin = octdec(isset($attr['devmin'] ) ? trim($attr['devmin'] ) : '');
$prefix = (isset($attr['prefix'] ) ? trim($attr['prefix'] ) : '');
if (($checksum == 256) && ($chksum == 0)) {
// EOF Found
break;
}
if ($prefix) {
$name = $prefix.'/'.$name;
}
if ((preg_match('#/$#', $name)) && !$name) {
$typeflag = 5;
}
if ($buffer == $null_512k) {
// it's the end of the tar-file...
break;
}
// Read to the next chunk
$this->fseek($size, SEEK_CUR);
$diff = $size % 512;
if ($diff != 0) {
// Padding, throw away
$this->fseek((512 - $diff), SEEK_CUR);
}
// Protect against tar-files with garbage at the end
if ($name == '') {
break;
}
$info['tar']['file_details'][$name] = array (
'name' => $name,
'mode_raw' => $mode,
'mode' => self::display_perms($mode),
'uid' => $uid,
'gid' => $gid,
'size' => $size,
'mtime' => $mtime,
'chksum' => $chksum,
'typeflag' => self::get_flag_type($typflag),
'linkname' => $lnkname,
'magic' => $magic,
'version' => $ver,
'uname' => $uname,
'gname' => $gname,
'devmajor' => $devmaj,
'devminor' => $devmin
);
$info['tar']['files'] = getid3_lib::array_merge_clobber($info['tar']['files'], getid3_lib::CreateDeepArray($info['tar']['file_details'][$name]['name'], '/', $size));
}
return true;
}
/**
* Parses the file mode to file permissions.
*
* @param int $mode
*
* @return string
*/
public function display_perms($mode) {
// Determine Type
if ($mode & 0x1000) $type='p'; // FIFO pipe
elseif ($mode & 0x2000) $type='c'; // Character special
elseif ($mode & 0x4000) $type='d'; // Directory
elseif ($mode & 0x6000) $type='b'; // Block special
elseif ($mode & 0x8000) $type='-'; // Regular
elseif ($mode & 0xA000) $type='l'; // Symbolic Link
elseif ($mode & 0xC000) $type='s'; // Socket
else $type='u'; // UNKNOWN
// Determine permissions
$owner['read'] = (($mode & 00400) ? 'r' : '-');
$owner['write'] = (($mode & 00200) ? 'w' : '-');
$owner['execute'] = (($mode & 00100) ? 'x' : '-');
$group['read'] = (($mode & 00040) ? 'r' : '-');
$group['write'] = (($mode & 00020) ? 'w' : '-');
$group['execute'] = (($mode & 00010) ? 'x' : '-');
$world['read'] = (($mode & 00004) ? 'r' : '-');
$world['write'] = (($mode & 00002) ? 'w' : '-');
$world['execute'] = (($mode & 00001) ? 'x' : '-');
// Adjust for SUID, SGID and sticky bit
if ($mode & 0x800) $owner['execute'] = ($owner['execute'] == 'x') ? 's' : 'S';
if ($mode & 0x400) $group['execute'] = ($group['execute'] == 'x') ? 's' : 'S';
if ($mode & 0x200) $world['execute'] = ($world['execute'] == 'x') ? 't' : 'T';
$s = sprintf('%1s', $type);
$s .= sprintf('%1s%1s%1s', $owner['read'], $owner['write'], $owner['execute']);
$s .= sprintf('%1s%1s%1s', $group['read'], $group['write'], $group['execute']);
$s .= sprintf('%1s%1s%1s'."\n", $world['read'], $world['write'], $world['execute']);
return $s;
}
/**
* Converts the file type.
*
* @param string $typflag
*
* @return mixed|string
*/
public function get_flag_type($typflag) {
static $flag_types = array(
'0' => 'LF_NORMAL',
'1' => 'LF_LINK',
'2' => 'LF_SYNLINK',
'3' => 'LF_CHR',
'4' => 'LF_BLK',
'5' => 'LF_DIR',
'6' => 'LF_FIFO',
'7' => 'LF_CONFIG',
'D' => 'LF_DUMPDIR',
'K' => 'LF_LONGLINK',
'L' => 'LF_LONGNAME',
'M' => 'LF_MULTIVOL',
'N' => 'LF_NAMES',
'S' => 'LF_SPARSE',
'V' => 'LF_VOLHDR'
);
return (isset($flag_types[$typflag]) ? $flag_types[$typflag] : '');
}
}
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