/**
* Get the encoded property value as a binary blob.
*
* @param string $value
* @param bool $string
* @return string
*/
protected function encodePropValue($value, $string = false)
{
// An int must be properly padded. (then split and reversed). For a string, we just split the chars. This seems
// to be the easiest way to handle UTF-8 characters instead of trying to work with their hex values.
$chars = $string ? MBString::str_split($value) : array_reverse(str_split($this->dec2hex($value, 8), 2));
$encoded = '';
foreach ($chars as $char) {
// Get the bits for the char. Using this method to ensure it is fully padded.
$bits = sprintf('%08b', $string ? MBString::ord($char) : hexdec($char));
$nibbleX = substr($bits, 0, 4);
$nibbleY = substr($bits, 4, 4);
// Construct the value with the header, high nibble, then low nibble.
$value = self::NIBBLE_HEADER;
foreach (['Y' => $nibbleY, 'X' => $nibbleX] as $nibbleType => $nibble) {
$value .= $this->getNibbleWithControl($nibbleType, $nibble);
}
// Convert it back to a binary bit stream
foreach ([0, 8, 16] as $start) {
$encoded .= $this->packBitString(substr($value, $start, 8), 8);
}
}
return $encoded;
}
/**
* Decode and parse the binary dial-in data from the userParameters attribute (the data between 44 and 96 bytes).
*
* @param string $binary
*/
protected function decode($binary)
{
$hex = bin2hex($binary);
$this->signature = MBString::chr(hexdec(substr($hex, 0, 2)));
$this->userPrivilege = hexdec(substr($hex, 2, 2));
$this->callbackPhoneNumber = substr($hex, 4, 48);
}