src/Type/Bit.php
public function readSigned(&$br, $length)
    {
        $this->setSigned(true);
        $value = $this->read($br, $length);
        $this->setSigned(false);

        return $value;
    }
public function readSigned(&$br, $length)
    {
        $this->setSigned(true);
        $value = $this->read($br, $length);
        $this->setSigned(false);

        return $value;
    }
Returns a signed integer from the bit level

@param  \PhpBinaryReader\BinaryReader $br
@param  int                           $length
@return int