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<?php |
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|
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/** |
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* Class AlphaNum |
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* |
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* @created 25.11.2015 |
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* @author Smiley <[email protected]> |
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* @copyright 2015 Smiley |
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* @license MIT |
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*/ |
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namespace WCPOS\Vendor\chillerlan\QRCode\Data; |
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|
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use WCPOS\Vendor\chillerlan\QRCode\Common\BitBuffer; |
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use WCPOS\Vendor\chillerlan\QRCode\Common\Mode; |
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use function ceil, intdiv, preg_match, strpos; |
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/** |
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* Alphanumeric mode: 0 to 9, A to Z, space, $ % * + - . / : |
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* |
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* ISO/IEC 18004:2000 Section 8.3.3 |
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* ISO/IEC 18004:2000 Section 8.4.3 |
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*/ |
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final class AlphaNum extends QRDataModeAbstract |
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{ |
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/** |
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* ISO/IEC 18004:2000 Table 5 |
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* |
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* @var string |
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*/ |
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private const CHAR_MAP = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:'; |
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/** |
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* @inheritDoc |
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*/ |
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public const DATAMODE = Mode::ALPHANUM; |
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/** |
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* @inheritDoc |
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*/ |
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public function getLengthInBits() : int |
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{ |
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return (int) ceil($this->getCharCount() * (11 / 2)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public static function validateString(string $string) : bool |
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{ |
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return (bool) preg_match('/^[A-Z\\d %$*+\\-.:\\/]+$/', $string); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function write(BitBuffer $bitBuffer, int $versionNumber) : QRDataModeInterface |
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{ |
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$len = $this->getCharCount(); |
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$bitBuffer->put(self::DATAMODE, 4)->put($len, $this::getLengthBits($versionNumber)); |
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// encode 2 characters in 11 bits |
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for ($i = 0; $i + 1 < $len; $i += 2) { |
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$bitBuffer->put($this->ord($this->data[$i]) * 45 + $this->ord($this->data[$i + 1]), 11); |
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} |
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// encode a remaining character in 6 bits |
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if ($i < $len) { |
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$bitBuffer->put($this->ord($this->data[$i]), 6); |
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} |
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return $this; |
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} |
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/** |
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* @inheritDoc |
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* |
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* @throws \chillerlan\QRCode\Data\QRCodeDataException |
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*/ |
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public static function decodeSegment(BitBuffer $bitBuffer, int $versionNumber) : string |
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{ |
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$length = $bitBuffer->read(self::getLengthBits($versionNumber)); |
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$result = ''; |
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// Read two characters at a time |
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while ($length > 1) { |
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if ($bitBuffer->available() < 11) { |
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throw new QRCodeDataException('not enough bits available'); |
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// @codeCoverageIgnore |
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} |
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$nextTwoCharsBits = $bitBuffer->read(11); |
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$result .= self::chr(intdiv($nextTwoCharsBits, 45)); |
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$result .= self::chr($nextTwoCharsBits % 45); |
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$length -= 2; |
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} |
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if ($length === 1) { |
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// special case: one character left |
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if ($bitBuffer->available() < 6) { |
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throw new QRCodeDataException('not enough bits available'); |
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// @codeCoverageIgnore |
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} |
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$result .= self::chr($bitBuffer->read(6)); |
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} |
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return $result; |
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} |
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/** |
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* @throws \chillerlan\QRCode\Data\QRCodeDataException |
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*/ |
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private function ord(string $chr) : int |
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{ |
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/** @phan-suppress-next-line PhanParamSuspiciousOrder */ |
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$ord = strpos(self::CHAR_MAP, $chr); |
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if ($ord === \false) { |
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throw new QRCodeDataException('invalid character'); |
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// @codeCoverageIgnore |
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} |
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return $ord; |
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} |
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/** |
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* @throws \chillerlan\QRCode\Data\QRCodeDataException |
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*/ |
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private static function chr(int $ord) : string |
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{ |
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if ($ord < 0 || $ord > 44) { |
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throw new QRCodeDataException('invalid character code'); |
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// @codeCoverageIgnore |
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} |
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return self::CHAR_MAP[$ord]; |
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} |
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} |
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