Swift_ByteStream_FileByteStream::_seekReadStreamToPosition PHP Method

    private function _seekReadStreamToPosition($offset)
    {
        if ($this->_seekable === null) {
            $this->_getReadStreamSeekableStatus();
        }
        if ($this->_seekable === false) {
            $currentPos = ftell($this->_reader);
            if ($currentPos < $offset) {
                $toDiscard = $offset - $currentPos;
                fread($this->_reader, $toDiscard);
                return;
            }
            $this->_copyReadStream();
        }
        fseek($this->_reader, $offset, SEEK_SET);
    }