Pony.fm/app/Library/getid3/getid3/module.graphic.efax.php

<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.archive.efax.php                                     //
// module for analyzing eFax files                             //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

class getid3_efax extends getid3_handler
{
    public function Analyze()
    {
        $info = &$this->getid3->info;

        $this->fseek($info['avdataoffset']);
        $efaxheader = $this->fread(1024);

        $info['efax']['header']['magic'] = substr($efaxheader, 0, 2);
        if ($info['efax']['header']['magic'] != "\xDC\xFE") {
            $this->error('Invalid eFax byte order identifier (expecting DC FE, found '.getid3_lib::PrintHexBytes($info['efax']['header']['magic']).') at offset '.$info['avdataoffset']);

            return false;
        }
        $info['fileformat'] = 'efax';

        $info['efax']['header']['filesize'] = getid3_lib::LittleEndian2Int(substr($efaxheader, 2, 4));
        if ($info['efax']['header']['filesize'] != $info['filesize']) {
            $this->error('Probable '.(($info['efax']['header']['filesize'] > $info['filesize']) ? 'truncated' : 'corrupt').' file, expecting '.$info['efax']['header']['filesize'].' bytes, found '.$info['filesize'].' bytes');
        }
        $info['efax']['header']['software1'] = rtrim(substr($efaxheader, 26, 32), "\x00");
        $info['efax']['header']['software2'] = rtrim(substr($efaxheader, 58, 32), "\x00");
        $info['efax']['header']['software3'] = rtrim(substr($efaxheader, 90, 32), "\x00");

        $info['efax']['header']['pages'] = getid3_lib::LittleEndian2Int(substr($efaxheader, 198, 2));
        $info['efax']['header']['data_bytes'] = getid3_lib::LittleEndian2Int(substr($efaxheader, 202, 4));

        $this->error('eFax parsing not enabled in this version of getID3() ['.$this->getid3->version().']');

        return false;

        return true;
    }
}