photo/app/Media/QuickTime/Atoms/moov/meta/ilst.php

41 lines
1.1 KiB
PHP

<?php
namespace App\Media\QuickTime\Atoms\moov\meta;
// Item LiST container atom
use App\Media\QuickTime\Atoms\SubAtom;
class ilst extends SubAtom
{
public function __construct(int $offset,int $size,string $filename,?string $data)
{
parent::__construct($offset,$size,$filename);
$ptr = 0;
while ($ptr < strlen($data)) {
$key_size = unpack('Nsize',substr($data,$ptr,4));
// Sometimes atoms are terminated with a 0
if ($key_size['size'] === 0) {
$ptr += 4;
continue;
}
$a = unpack(sprintf('a4name/a%ddata',$key_size['size']-8),substr($data,$ptr+4,4+$key_size['size']-8));
$ptr += $key_size['size'];
// If we didnt get the right amount of data, something is wrong.
if (strlen($a['data']) < $key_size['size']-8)
break;
$b = unpack(sprintf('Nsize/a4name/a%ddata',strlen($a['data'])-8),$a['data']);
if ($b['name'] !== 'data')
throw new \Exception('Parsing of ILST got data that wasnt expected');
$c = unpack(sprintf('a4language/a4unknown/a%ddata',strlen($b['data'])-8),$b['data']);
// heirachy, name, size, offset
$this->cache = $this->cache->push($c['data']);
}
}
}