/**
* @return string
*/
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
$CONTchunk .= Helper::BigEndian2String(!empty($this->tag_data['title']) ? strlen($this->tag_data['title']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['title']) ? strlen($this->tag_data['title']) : '';
$CONTchunk .= Helper::BigEndian2String(!empty($this->tag_data['artist']) ? strlen($this->tag_data['artist']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['artist']) ? strlen($this->tag_data['artist']) : '';
$CONTchunk .= Helper::BigEndian2String(!empty($this->tag_data['copyright']) ? strlen($this->tag_data['copyright']) : 0, 2);
$CONTchunk .= !empty($this->tag_data['copyright']) ? strlen($this->tag_data['copyright']) : '';
$CONTchunk .= Helper::BigEndian2String(!empty($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);
}
$CONTchunk = 'CONT' . Helper::BigEndian2String(strlen($CONTchunk) + 8, 4) . $CONTchunk;
// CONT chunk identifier + chunk length
return $CONTchunk;
}
/**
* @param type $noerrorsonly
*
* @return bool
*/
public function GenerateID3v2Tag($noerrorsonly = true)
{
$this->ID3v2FrameIsAllowed(null, '');
// clear static array in case this isn't the first call to $this->GenerateID3v2Tag()
$tagstring = '';
if (is_array($this->tag_data)) {
foreach ($this->tag_data as $frame_name => $frame_rawinputdata) {
foreach ($frame_rawinputdata as $irrelevantindex => $source_data_array) {
if (Tag\Id3v2::IsValidID3v2FrameName($frame_name, $this->majorversion)) {
unset($frame_length);
unset($frame_flags);
$frame_data = false;
if ($this->ID3v2FrameIsAllowed($frame_name, $source_data_array)) {
if ($frame_data = $this->GenerateID3v2FrameData($frame_name, $source_data_array)) {
$FrameUnsynchronisation = false;
if ($this->majorversion >= 4) {
// frame-level unsynchronisation
$unsynchdata = $frame_data;
if ($this->id3v2_use_unsynchronisation) {
$unsynchdata = $this->Unsynchronise($frame_data);
}
if (strlen($unsynchdata) != strlen($frame_data)) {
// unsynchronisation needed
$FrameUnsynchronisation = true;
$frame_data = $unsynchdata;
if (isset($TagUnsynchronisation) && $TagUnsynchronisation === false) {
// only set to true if ALL frames are unsynchronised
} else {
$TagUnsynchronisation = true;
}
} else {
if (isset($TagUnsynchronisation)) {
$TagUnsynchronisation = false;
}
}
unset($unsynchdata);
$frame_length = Helper::BigEndian2String(strlen($frame_data), 4, true);
} else {
$frame_length = Helper::BigEndian2String(strlen($frame_data), 4, false);
}
$frame_flags = $this->GenerateID3v2FrameFlags($this->ID3v2FrameFlagsLookupTagAlter($frame_name), $this->ID3v2FrameFlagsLookupFileAlter($frame_name), false, false, false, false, $FrameUnsynchronisation, false);
}
} else {
$this->errors[] = 'Frame "' . $frame_name . '" is NOT allowed';
}
if ($frame_data === false) {
$this->errors[] = '$this->GenerateID3v2FrameData() failed for "' . $frame_name . '"';
if ($noerrorsonly) {
return false;
} else {
unset($frame_name);
}
}
} else {
// ignore any invalid frame names, including 'title', 'header', etc
$this->warnings[] = 'Ignoring invalid ID3v2 frame type: "' . $frame_name . '"';
unset($frame_name);
unset($frame_length);
unset($frame_flags);
unset($frame_data);
}
if (isset($frame_name) && isset($frame_length) && isset($frame_flags) && isset($frame_data)) {
$tagstring .= $frame_name . $frame_length . $frame_flags . $frame_data;
}
}
}
if (!isset($TagUnsynchronisation)) {
$TagUnsynchronisation = false;
}
if ($this->majorversion <= 3 && $this->id3v2_use_unsynchronisation) {
// tag-level unsynchronisation
$unsynchdata = $this->Unsynchronise($tagstring);
if (strlen($unsynchdata) != strlen($tagstring)) {
// unsynchronisation needed
$TagUnsynchronisation = true;
$tagstring = $unsynchdata;
}
}
while ($this->paddedlength < strlen($tagstring) + Tag\Id3v2::ID3v2HeaderLength($this->majorversion)) {
$this->paddedlength += 1024;
}
$footer = false;
// ID3v2 footers not yet supported in GetId3Core()
if (!$footer && $this->paddedlength > strlen($tagstring) + Tag\Id3v2::ID3v2HeaderLength($this->majorversion)) {
// pad up to $paddedlength bytes if unpadded tag is shorter than $paddedlength
// "Furthermore it MUST NOT have any padding when a tag footer is added to the tag."
if ($this->paddedlength - strlen($tagstring) - Tag\Id3v2::ID3v2HeaderLength($this->majorversion) > 0) {
$tagstring .= str_repeat("", $this->paddedlength - strlen($tagstring) - Tag\Id3v2::ID3v2HeaderLength($this->majorversion));
}
}
if ($this->id3v2_use_unsynchronisation && substr($tagstring, strlen($tagstring) - 1, 1) == "ÿ") {
// special unsynchronisation case:
// if last byte == $FF then appended a $00
$TagUnsynchronisation = true;
$tagstring .= "";
}
$tagheader = 'ID3';
$tagheader .= chr($this->majorversion);
$tagheader .= chr($this->minorversion);
$tagheader .= $this->GenerateID3v2TagFlags(array('unsynchronisation' => $TagUnsynchronisation));
$tagheader .= Helper::BigEndian2String(strlen($tagstring), 4, true);
return $tagheader . $tagstring;
}
$this->errors[] = 'tag_data is not an array in GenerateID3v2Tag()';
return false;
}
