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<?php |
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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 chillerlan\QRCode\Data; |
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use chillerlan\QRCode\Common\{BitBuffer, Mode}; |
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use function array_flip, ceil, str_split; |
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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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* ISO/IEC 18004:2000 Table 5 |
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* |
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* @var int[] |
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*/ |
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private const CHAR_TO_ORD = [ |
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'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, |
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'8' => 8, '9' => 9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13, 'E' => 14, 'F' => 15, |
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'G' => 16, 'H' => 17, 'I' => 18, 'J' => 19, 'K' => 20, 'L' => 21, 'M' => 22, 'N' => 23, |
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'O' => 24, 'P' => 25, 'Q' => 26, 'R' => 27, 'S' => 28, 'T' => 29, 'U' => 30, 'V' => 31, |
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'W' => 32, 'X' => 33, 'Y' => 34, 'Z' => 35, ' ' => 36, '$' => 37, '%' => 38, '*' => 39, |
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'+' => 40, '-' => 41, '.' => 42, '/' => 43, ':' => 44, |
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]; |
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/** |
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* @inheritDoc |
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*/ |
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protected static int $datamode = Mode::ALPHANUM; |
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/** |
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* @inheritDoc |
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*/ |
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public function getLengthInBits():int{ |
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return (int)ceil($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 $string):bool{ |
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foreach(str_split($string) as $chr){ |
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if(!isset(self::CHAR_TO_ORD[$chr])){ |
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return false; |
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} |
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} |
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return true; |
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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 $versionNumber):void{ |
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$len = $this->getCharCount(); |
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$bitBuffer |
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->put($this::$datamode, 4) |
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->put($len, Mode::getLengthBitsForVersion($this::$datamode, $versionNumber)) |
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; |
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// encode 2 characters in 11 bits |
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for($i = 0; $i + 1 < $len; $i += 2){ |
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$bitBuffer->put(self::CHAR_TO_ORD[$this->data[$i]] * 45 + self::CHAR_TO_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(self::CHAR_TO_ORD[$this->data[$i]], 6); |
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} |
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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 $versionNumber):string{ |
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$length = $bitBuffer->read(Mode::getLengthBitsForVersion(self::$datamode, $versionNumber)); |
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$charmap = array_flip(self::CHAR_TO_ORD); |
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// @todo |
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$toAlphaNumericChar = function(int $ord) use ($charmap):string{ |
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if(isset($charmap[$ord])){ |
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return $charmap[$ord]; |
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} |
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throw new QRCodeDataException('invalid character value: '.$ord); |
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}; |
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$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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} |
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$nextTwoCharsBits = $bitBuffer->read(11); |
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$result .= $toAlphaNumericChar($nextTwoCharsBits / 45); |
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$result .= $toAlphaNumericChar($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($bitBuffer->available() < 6){ |
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throw new QRCodeDataException('not enough bits available'); |
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} |
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$result .= $toAlphaNumericChar($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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chillerlan /
php-qrcode
