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<?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.real.php //
// module for writing RealAudio/RealVideo tags //
// dependencies: module.tag.real.php //
// ///
/////////////////////////////////////////////////////////////////
class getid3_write_real
{
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
var $paddedlength = 512; // minimum length of CONT tag in bytes
function getid3_write_real() {
return true;
}
function WriteReal() {
// File MUST be writeable - CHMOD(646) at least
if (is_writeable($this->filename)) {
if ($fp_source = @fopen($this->filename, 'r+b')) {
// Initialize getID3 engine
$getID3 = new getID3;
$OldThisFileInfo = $getID3->analyze($this->filename);
if (empty($OldThisFileInfo['chunks']) && !empty($OldThisFileInfo['old_ra_header'])) {
$this->errors[] = 'Cannot write Real tags on old-style file format';
return false;
}
$OldPROPinfo = false;
$StartOfDATA = false;
foreach ($OldThisFileInfo['chunks'] as $chunknumber => $chunkarray) {
if ($chunkarray['name'] == 'PROP') {
$OldPROPinfo = $chunkarray;
} elseif ($chunkarray['name'] = 'DATA') {
$StartOfDATA = $chunkarray['offset'];
}
}
if (!empty($OldPROPinfo['length'])) {
$this->paddedlength = max($OldPROPinfo['length'], $this->paddedlength);
}
$new_real_tag_data = GenerateRealTag();
if (@$OldPROPinfo['length'] == $new_real_tag_data) {
// new data length is same as old data length - just overwrite
fseek($fp_source, $OldPROPinfo['offset'], SEEK_SET);
fwrite($fp_source, $new_real_tag_data);
} else {
if (empty($OldPROPinfo)) {
// no existing PROP chunk
$BeforeOffset = $StartOfDATA;
$AfterOffset = $StartOfDATA;
} else {
// new data is longer than old data
$BeforeOffset = $OldPROPinfo['offset'];
$AfterOffset = $OldPROPinfo['offset'] + $OldPROPinfo['length'];
}
}
fclose($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 GenerateRealTag() {
$RealCONT = "\x00\x00"; // object version
$RealCONT .= BigEndian2String(strlen(@$this->tag_data['title']), 4);
$RealCONT .= @$this->tag_data['title'];
$RealCONT .= BigEndian2String(strlen(@$this->tag_data['artist']), 4);
$RealCONT .= @$this->tag_data['artist'];
$RealCONT .= BigEndian2String(strlen(@$this->tag_data['copyright']), 4);
$RealCONT .= @$this->tag_data['copyright'];
$RealCONT .= BigEndian2String(strlen(@$this->tag_data['comment']), 4);
$RealCONT .= @$this->tag_data['comment'];
if ($this->paddedlength > (strlen($RealCONT) + 8)) {
$RealCONT .= str_repeat("\x00", $this->paddedlength - strlen($RealCONT) - 8);
}
$RealCONT = 'CONT'.BigEndian2String(strlen($RealCONT) + 8, 4).$RealCONT; // CONT chunk identifier + chunk length
return $RealCONT;
}
function RemoveReal() {
// File MUST be writeable - CHMOD(646) at least
if (is_writeable($this->filename)) {
if ($fp_source = @fopen($this->filename, 'r+b')) {
return false;
//fseek($fp_source, -128, SEEK_END);
//if (fread($fp_source, 3) == 'TAG') {
// ftruncate($fp_source, filesize($this->filename) - 128);
//} else {
// // no real 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;
}
}
?>
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