source: extensions/charlies_content/getid3/getid3/write.vorbiscomment.php @ 3544

<?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                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// write.vorbiscomment.php                                     //
// module for writing VorbisComment tags                       //
// dependencies: /helperapps/vorbiscomment.exe                 //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_write_vorbiscomment
{

        var $filename;
        var $tag_data;
        var $warnings = array(); // any non-critical errors will be stored here
        var $errors   = array(); // any critical errors will be stored here

        function getid3_write_vorbiscomment() {
                return true;
        }

        function WriteVorbisComment() {

                if (!ini_get('safe_mode')) {

                        // Create file with new comments
                        $tempcommentsfilename = tempnam('*', 'getID3');
                        if ($fpcomments = @fopen($tempcommentsfilename, 'wb')) {

                                foreach ($this->tag_data as $key => $value) {
                                        foreach ($value as $commentdata) {
                                                fwrite($fpcomments, $this->CleanVorbisCommentName($key).'='.$commentdata."\n");
                                        }
                                }
                                fclose($fpcomments);

                        } else {

                                $this->errors[] = 'failed to open temporary tags file "'.$tempcommentsfilename.'", tags not written';
                                return false;

                        }

                        $oldignoreuserabort = ignore_user_abort(true);
                        if (GETID3_OS_ISWINDOWS) {

                                if (file_exists(GETID3_HELPERAPPSDIR.'vorbiscomment.exe')) {
                                        //$commandline = '"'.GETID3_HELPERAPPSDIR.'vorbiscomment.exe" -w --raw -c "'.$tempcommentsfilename.'" "'.str_replace('/', '\\', $this->filename).'"';
                                        //  vorbiscomment works fine if you copy-paste the above commandline into a command prompt,
                                        //  but refuses to work with `backtick` if there are "doublequotes" present around BOTH
                                        //  the metaflac pathname and the target filename. For whatever reason...??
                                        //  The solution is simply ensure that the metaflac pathname has no spaces,
                                        //  and therefore does not need to be quoted

                                        // On top of that, if error messages are not always captured properly under Windows
                                        // To at least see if there was a problem, compare file modification timestamps before and after writing
                                        clearstatcache();
                                        $timestampbeforewriting = filemtime($this->filename);

                                        $commandline = GETID3_HELPERAPPSDIR.'vorbiscomment.exe -w --raw -c "'.$tempcommentsfilename.'" "'.$this->filename.'" 2>&1';
                                        $VorbiscommentError = `$commandline`;

                                        if (empty($VorbiscommentError)) {
                                                clearstatcache();
                                                if ($timestampbeforewriting == filemtime($this->filename)) {
                                                        $VorbiscommentError = 'File modification timestamp has not changed - it looks like the tags were not written';
                                                }
                                        }
                                } else {
                                        $VorbiscommentError = 'vorbiscomment.exe not found in '.GETID3_HELPERAPPSDIR;
                                }

                        } else {

                                $commandline = 'vorbiscomment -w --raw -c "'.$tempcommentsfilename.'" "'.$this->filename.'" 2>&1';
                                $VorbiscommentError = `$commandline`;

                        }

                        // Remove temporary comments file
                        unlink($tempcommentsfilename);
                        ignore_user_abort($oldignoreuserabort);

                        if (!empty($VorbiscommentError)) {

                                $this->errors[] = 'system call to vorbiscomment failed with message: '."\n\n".$VorbiscommentError;
                                return false;

                        }

                        return true;
                }

                $this->errors[] = 'PHP running in Safe Mode (backtick operator not available) - cannot call vorbiscomment, tags not written';
                return false;
        }

        function DeleteVorbisComment() {
                $this->tag_data = array(array());
                return $this->WriteVorbisComment();
        }

        function CleanVorbisCommentName($originalcommentname) {
                // A case-insensitive field name that may consist of ASCII 0x20 through 0x7D, 0x3D ('=') excluded.
                // ASCII 0x41 through 0x5A inclusive (A-Z) is to be considered equivalent to ASCII 0x61 through
                // 0x7A inclusive (a-z).

                // replace invalid chars with a space, return uppercase text
                // Thanks Chris Bolt <chris-getid3Øbolt*cx> for improving this function
                // note: ereg_replace() replaces nulls with empty string (not space)
                return strtoupper(ereg_replace('[^ -<>-}]', ' ', str_replace("\x00", ' ', $originalcommentname)));

        }

}

?>