<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// 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>                       //
//                                                             //
/////////////////////////////////////////////////////////////////


class getid3_tar {

    function getid3_tar(&$fd, &$ThisFileInfo) {
        $ThisFileInfo['fileformat'] = 'tar';
        $ThisFileInfo['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

        @fseek($fd, 0);
        while (!feof($fd)) {
            $buffer = fread($fd, 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);
            $name    =        trim(@$attr['fname']);
            $mode    = octdec(trim(@$attr['mode']));
            $uid     = octdec(trim(@$attr['uid']));
            $gid     = octdec(trim(@$attr['gid']));
            $size    = octdec(trim(@$attr['size']));
            $mtime   = octdec(trim(@$attr['mtime']));
            $chksum  = octdec(trim(@$attr['chksum']));
            $typflag =        trim(@$attr['typflag']);
            $lnkname =        trim(@$attr['lnkname']);
            $magic   =        trim(@$attr['magic']);
            $ver     =        trim(@$attr['ver']);
            $uname   =        trim(@$attr['uname']);
            $gname   =        trim(@$attr['gname']);
            $devmaj  = octdec(trim(@$attr['devmaj']));
            $devmin  = octdec(trim(@$attr['devmin']));
            $prefix  =        trim(@$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
            fseek($fd, $size, SEEK_CUR);

            $diff = $size % 512;
            if ($diff != 0) {
                // Padding, throw away
                fseek($fd, (512 - $diff), SEEK_CUR);
            }
            // Protect against tar-files with garbage at the end
            if ($name == '') {
                break;
            }
            $ThisFileInfo['tar']['file_details'][$name] = array (
                'name'     => $name,
                'mode_raw' => $mode,
                'mode'     => getid3_tar::display_perms($mode),
                'uid'      => $uid,
                'gid'      => $gid,
                'size'     => $size,
                'mtime'    => $mtime,
                'chksum'   => $chksum,
                'typeflag' => getid3_tar::get_flag_type($typflag),
                'linkname' => $lnkname,
                'magic'    => $magic,
                'version'  => $ver,
                'uname'    => $uname,
                'gname'    => $gname,
                'devmajor' => $devmaj,
                'devminor' => $devmin
            );
            $ThisFileInfo['tar']['files'] = getid3_lib::array_merge_clobber($ThisFileInfo['tar']['files'], getid3_lib::CreateDeepArray($ThisFileInfo['tar']['file_details'][$name]['name'], '/', $size));
        }
        return true;
    }

    // Parses the file mode to file permissions
    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
    function get_flag_type($typflag) {
        static $flag_types = array(
            '0' => 'LF_NORMAL',
            '1' => 'LF_LINK',
            '2' => 'LF_SYNLINK',
            '3' => 'LF_CHR',
            '4' => 'LF_BLK',
            '5' => 'LF_DIR',
            '6' => 'LF_FIFO',
            '7' => 'LF_CONFIG',
            'D' => 'LF_DUMPDIR',
            'K' => 'LF_LONGLINK',
            'L' => 'LF_LONGNAME',
            'M' => 'LF_MULTIVOL',
            'N' => 'LF_NAMES',
            'S' => 'LF_SPARSE',
            'V' => 'LF_VOLHDR'
        );
        return @$flag_types[$typflag];
    }

}

?>