/**
* @param $str
* @param $pos
*
* @return bool
*/
public static function isAlNumAt($str, $pos)
{
return $pos >= strlen($str) ? false : Input::lookAnTable(ord($str[$pos])) >= 0;
}
/**
* @param $version
*
* @return int
*/
public function encodeModeAn($version)
{
try {
$words = (int) ($this->size / 2);
$bs = new BitStream();
$bs->appendNum(4, 0x2);
$bs->appendNum(Specifications::lengthIndicator(Enum::QR_MODE_AN, $version), $this->size);
for ($i = 0; $i < $words; $i++) {
$val = (int) Input::lookAnTable(ord($this->data[$i * 2])) * 45;
$val += (int) Input::lookAnTable(ord($this->data[$i * 2 + 1]));
$bs->appendNum(11, $val);
}
if ($this->size & 1) {
$val = Input::lookAnTable(ord($this->data[$words * 2]));
$bs->appendNum(6, $val);
}
$this->bStream = $bs;
} catch (\Exception $e) {
return -1;
}
return 0;
}