module.archive.szip.php

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<?php
//  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;

        }

}

?>