module.audio.mod.php

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<?php
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
// See readme.txt for more details                             //
//                                                             //
// module.audio.mod.php                                        //
// module for analyzing MOD Audio files                        //
// dependencies: NONE                                          //
//                                                            ///


class getid3_mod extends getid3_handler
{

        public function Analyze() {
                $info = &$this->getid3->info;
                $this->fseek($info['avdataoffset']);
                $fileheader = $this->fread(1088);
                if (preg_match('#^IMPM#', $fileheader)) {
                        return $this->getITheaderFilepointer();
                } elseif (preg_match('#^Extended Module#', $fileheader)) {
                        return $this->getXMheaderFilepointer();
                } elseif (preg_match('#^.{44}SCRM#', $fileheader)) {
                        return $this->getS3MheaderFilepointer();
                } elseif (preg_match('#^.{1080}(M\\.K\\.|M!K!|FLT4|FLT8|[5-9]CHN|[1-3][0-9]CH)#', $fileheader)) {
                        return $this->getMODheaderFilepointer();
                }
                $this->error('This is not a known type of MOD file');
                return false;
        }


        public function getMODheaderFilepointer() {
                $info = &$this->getid3->info;
                $this->fseek($info['avdataoffset'] + 1080);
                $FormatID = $this->fread(4);
                if (!preg_match('#^(M.K.|[5-9]CHN|[1-3][0-9]CH)$#', $FormatID)) {
                        $this->error('This is not a known type of MOD file');
                        return false;
                }

                $info['fileformat'] = 'mod';

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

        public function getXMheaderFilepointer() {
                $info = &$this->getid3->info;
                $this->fseek($info['avdataoffset']);
                $FormatID = $this->fread(15);
                if (!preg_match('#^Extended Module$#', $FormatID)) {
                        $this->error('This is not a known type of XM-MOD file');
                        return false;
                }

                $info['fileformat'] = 'xm';

                $this->error('XM-MOD parsing not enabled in this version of getID3() ['.$this->getid3->version().']');
                return false;
        }

        public function getS3MheaderFilepointer() {
                $info = &$this->getid3->info;
                $this->fseek($info['avdataoffset'] + 44);
                $FormatID = $this->fread(4);
                if (!preg_match('#^SCRM$#', $FormatID)) {
                        $this->error('This is not a ScreamTracker MOD file');
                        return false;
                }

                $info['fileformat'] = 's3m';

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

        public function getITheaderFilepointer() {
                $info = &$this->getid3->info;
                $this->fseek($info['avdataoffset']);
                $FormatID = $this->fread(4);
                if (!preg_match('#^IMPM$#', $FormatID)) {
                        $this->error('This is not an ImpulseTracker MOD file');
                        return false;
                }

                $info['fileformat'] = 'it';

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

}