src/Type/Int8.php
public function readSigned(&$br)
    {
        $this->setEndian('c');
        $value = $this->read($br);
        $this->setEndian('C');

        return $value;
    }
public function readSigned(&$br)
    {
        $this->setEndian('c');
        $value = $this->read($br);
        $this->setEndian('C');

        return $value;
    }
Returns a Signed 8-bit Integer (aka a single byte)

@param  \PhpBinaryReader\BinaryReader $br
@return int