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<?php
namespace lib;
use php_user_filter;
class FilterTranscode extends php_user_filter
{
const FILTER_NAME = 'convert.transcode.';
private $encoding_from = 'auto';
private $encoding_to;
public function onCreate()
{
if (strpos($this->filtername, self::FILTER_NAME) !== 0) {
return false;
}
$params = substr($this->filtername, strlen(self::FILTER_NAME));
if (! preg_match('/^([-\w]+)(:([-\w]+))?$/', $params, $matches)) {
return false;
}
if (isset($matches[1])) {
$this->encoding_from = $matches[1];
}
$this->encoding_to = mb_internal_encoding();
if (isset($matches[3])) {
$this->encoding_to = $matches[3];
}
$this->params['locale'] = setlocale(LC_CTYPE, '0');
if (stripos($this->params['locale'], 'UTF-8') === false) {
setlocale(LC_CTYPE, 'en_US.UTF-8');
}
return true;
}
public function onClose()
{
setlocale(LC_CTYPE, $this->params['locale']);
}
public function filter($in, $out, &$consumed, $closing)
{
while ($res = stream_bucket_make_writeable($in)) {
$res->data = @mb_convert_encoding($res->data, $this->encoding_to, $this->encoding_from);
$consumed += $res->datalen;
stream_bucket_append($out, $res);
}
return PSFS_PASS_ON;
}
}
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