<?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.szip.php                                     //
// module for analyzing SZIP compressed files                  //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_szip
{

    function getid3_szip(&$fd, &$ThisFileInfo) {

        fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
        $SZIPHeader = fread($fd, 6);
        if (substr($SZIPHeader, 0, 4) != 'SZ'."\x0A\x04") {
            $ThisFileInfo['error'][] = 'Expecting "SZ[x0A][x04]" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($SZIPHeader, 0, 4).'"';
            return false;
        }

        $ThisFileInfo['fileformat']            = 'szip';

        $ThisFileInfo['szip']['major_version'] = getid3_lib::BigEndian2Int(substr($SZIPHeader, 4, 1));
        $ThisFileInfo['szip']['minor_version'] = getid3_lib::BigEndian2Int(substr($SZIPHeader, 5, 1));

        while (!feof($fd)) {
            $NextBlockID = fread($fd, 2);
            switch ($NextBlockID) {
                case 'SZ':
                    // Note that szip files can be concatenated, this has the same effect as
                    // concatenating the files. this also means that global header blocks
                    // might be present between directory/data blocks.
                    fseek($fd, 4, SEEK_CUR);
                    break;

                case 'BH':
                    $BHheaderbytes  = getid3_lib::BigEndian2Int(fread($fd, 3));
                    $BHheaderdata   = fread($fd, $BHheaderbytes);
                    $BHheaderoffset = 0;
                    while (strpos($BHheaderdata, "\x00", $BHheaderoffset) > 0) {
                        //filename as \0 terminated string  (empty string indicates end)
                        //owner as \0 terminated string (empty is same as last file)
                        //group as \0 terminated string (empty is same as last file)
                        //3 byte filelength in this block
                        //2 byte access flags
                        //4 byte creation time (like in unix)
                        //4 byte modification time (like in unix)
                        //4 byte access time (like in unix)

                        $BHdataArray['filename'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
                        $BHheaderoffset += (strlen($BHdataArray['filename']) + 1);

                        $BHdataArray['owner'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
                        $BHheaderoffset += (strlen($BHdataArray['owner']) + 1);

                        $BHdataArray['group'] = substr($BHheaderdata, $BHheaderoffset, strcspn($BHheaderdata, "\x00"));
                        $BHheaderoffset += (strlen($BHdataArray['group']) + 1);

                        $BHdataArray['filelength'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 3));
                        $BHheaderoffset += 3;

                        $BHdataArray['access_flags'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 2));
                        $BHheaderoffset += 2;

                        $BHdataArray['creation_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
                        $BHheaderoffset += 4;

                        $BHdataArray['modification_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
                        $BHheaderoffset += 4;

                        $BHdataArray['access_time'] = getid3_lib::BigEndian2Int(substr($BHheaderdata, $BHheaderoffset, 4));
                        $BHheaderoffset += 4;

                        $ThisFileInfo['szip']['BH'][] = $BHdataArray;
                    }
                    break;

                default:
                    break 2;
            }
        }

        return true;

    }

}

?>