source: extensions/charlies_content/getid3/getid3/write.id3v1.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.id3v1.php                                             //
// module for writing ID3v1 tags                               //
// dependencies: module.tag.id3v1.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v1.php', __FILE__, true);

class getid3_write_id3v1
{
        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_id3v1() {
                return true;
        }

        function WriteID3v1() {
                if ((filesize($this->filename) >= (pow(2, 31) - 128)) || (filesize($this->filename) < 0)) {
                        $this->errors[] = 'Unable to write ID3v1 because file is larger than 2GB';
                        return false;
                }

                // File MUST be writeable - CHMOD(646) at least
                if (is_writeable($this->filename)) {
                        if ($fp_source = @fopen($this->filename, 'r+b')) {

                                fseek($fp_source, -128, SEEK_END);
                                if (fread($fp_source, 3) == 'TAG') {
                                        fseek($fp_source, -128, SEEK_END); // overwrite existing ID3v1 tag
                                } else {
                                        fseek($fp_source, 0, SEEK_END);    // append new ID3v1 tag
                                }
                                $this->tag_data['track'] = (isset($this->tag_data['track']) ? $this->tag_data['track'] : (isset($this->tag_data['track_number']) ? $this->tag_data['track_number'] : (isset($this->tag_data['tracknumber']) ? $this->tag_data['tracknumber'] : '')));

                                $new_id3v1_tag_data = getid3_id3v1::GenerateID3v1Tag(
                                                                                                                @$this->tag_data['title'],
                                                                                                                @$this->tag_data['artist'],
                                                                                                                @$this->tag_data['album'],
                                                                                                                @$this->tag_data['year'],
                                                                                                                @$this->tag_data['genreid'],
                                                                                                                @$this->tag_data['comment'],
                                                                                                                @$this->tag_data['track']);
                                fwrite($fp_source, $new_id3v1_tag_data, 128);
                                fclose($fp_source);
                                return true;

                        } else {
                                $this->errors[] = 'Could not open '.$this->filename.' mode "r+b"';
                                return false;
                        }
                }
                $this->errors[] = 'File is not writeable: '.$this->filename;
                return false;
        }

        function FixID3v1Padding() {
                // ID3v1 data is supposed to be padded with NULL characters, but some taggers incorrectly use spaces
                // This function rewrites the ID3v1 tag with correct padding

                // Initialize getID3 engine
                $getID3 = new getID3;
                $ThisFileInfo = $getID3->analyze($this->filename);
                if ($ThisFileInfo['filesize'] >= (pow(2, 31) - 128)) {
                        // cannot write tags on files > 2GB
                        return false;
                }
                if (isset($ThisFileInfo['tags']['id3v1'])) {
                        foreach ($ThisFileInfo['tags']['id3v1'] as $key => $value) {
                                $id3v1data[$key] = implode(',', $value);
                        }
                        $this->tag_data = $id3v1data;
                        return $this->WriteID3v1();
                }
                return false;
        }

        function RemoveID3v1() {
                if ($ThisFileInfo['filesize'] >= pow(2, 31)) {
                        $this->errors[] = 'Unable to write ID3v1 because file is larger than 2GB';
                        return false;
                }

                // File MUST be writeable - CHMOD(646) at least
                if (is_writeable($this->filename)) {
                        if ($fp_source = @fopen($this->filename, 'r+b')) {

                                fseek($fp_source, -128, SEEK_END);
                                if (fread($fp_source, 3) == 'TAG') {
                                        ftruncate($fp_source, filesize($this->filename) - 128);
                                } else {
                                        // no ID3v1 tag to begin with - do nothing
                                }
                                fclose($fp_source);
                                return true;

                        } else {
                                $this->errors[] = 'Could not open '.$this->filename.' mode "r+b"';
                        }
                } else {
                        $this->errors[] = $this->filename.' is not writeable';
                }
                return false;
        }

}

?>