MessagePack\BufferUnpacker::unpackExt PHP Method

    private function unpackExt($length)
    {
        if (!isset($this->buffer[$this->offset + $length - 1])) {
            throw new InsufficientDataException($length, \strlen($this->buffer) - $this->offset);
        }
        $type = $this->unpackInt8();
        if ($this->transformers && ($transformer = $this->transformers->find($type))) {
            return $transformer->reverseTransform($this->unpack());
        }
        $data = \substr($this->buffer, $this->offset, $length);
        $this->offset += $length;
        return new Ext($type, $data);
    }