Ability to read particular length from stream about byte-stream HOT 4 CLOSED

class BinaryBuffer
{
    public function __construct(InputStream $inputStream);

    public function read(int $length) : string

    public function unpack(array $format) : Promise<array>
}

$buffer = new BinaryBuffer($stream);

try {
    yield $buffer->read(4); // some padding bytes
} catch (UnexpectedStreamClosedException $e) {
    // stream was closed unexpectedly
} catch (NotEnoughInputException $e) {
    // stream was ended before 4 bytes were received
}

try {
    ['length => $length, 'magic' => $magic, 'version' => $version] = yield $buffer->unpack([
        'length' => 'L',
        'magic'  => 'C',
        'version' => ['a', 16], // well, I know it's looks not well. need some better idea
    ]);

    [$packet] = yield $buffer->unpack([
        ['a', $length]
    ]);
} catch (UnexpectedStreamClosedException|NotEnoughInputException $e) {
    // the same as before
}