public function GenerateCONTchunk()
{
foreach ($this->tag_data as $key => $value) {
// limit each value to 0xFFFF bytes
$this->tag_data[$key] = substr($value, 0, 65535);
}
$CONTchunk = "";
// object version
$CONTchunk .= Utils::BigEndian2String(!empty($this->tag_data['title']) ? strlen($this->tag_data['title']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['title']) ? strlen($this->tag_data['title']) : '';
$CONTchunk .= Utils::BigEndian2String(!empty($this->tag_data['artist']) ? strlen($this->tag_data['artist']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['artist']) ? strlen($this->tag_data['artist']) : '';
$CONTchunk .= Utils::BigEndian2String(!empty($this->tag_data['copyright']) ? strlen($this->tag_data['copyright']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['copyright']) ? strlen($this->tag_data['copyright']) : '';
$CONTchunk .= Utils::BigEndian2String(!empty($this->tag_data['comment']) ? strlen($this->tag_data['comment']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['comment']) ? strlen($this->tag_data['comment']) : '';
if ($this->paddedlength > strlen($CONTchunk) + 8) {
$CONTchunk .= str_repeat("", $this->paddedlength - strlen($CONTchunk) - 8);
}
$CONTchunk = 'CONT' . Utils::BigEndian2String(strlen($CONTchunk) + 8, 4) . $CONTchunk;
// CONT chunk identifier + chunk length
return $CONTchunk;
}
