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<?php |
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/** |
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* Class Number |
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* |
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* @filesource Number.php |
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* @created 26.11.2015 |
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* @package chillerlan\QRCode\Data |
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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, ord, sprintf, str_split, substr; |
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/** |
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* Numeric mode: decimal digits 0 to 9 |
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* |
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* ISO/IEC 18004:2000 Section 8.3.2 |
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* ISO/IEC 18004:2000 Section 8.4.2 |
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*/ |
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final class Number extends QRDataModeAbstract{ |
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/** |
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* @var int[] |
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*/ |
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protected const CHAR_MAP_NUMBER = [ |
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'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, '8' => 8, '9' => 9, |
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]; |
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protected static int $datamode = Mode::DATA_NUMBER; |
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/** |
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* @inheritdoc |
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*/ |
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public function getLengthInBits():int{ |
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return (int)ceil($this->getCharCount() * (10 / 3)); |
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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 $chr){ |
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if(!isset(self::CHAR_MAP_NUMBER[$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, $versionNumber)) |
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; |
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$i = 0; |
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// encode numeric triplets in 10 bits |
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while($i + 2 < $len){ |
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$bitBuffer->put($this->parseInt(substr($this->data, $i, 3)), 10); |
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$i += 3; |
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} |
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if($i < $len){ |
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// encode 2 remaining numbers in 7 bits |
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if($len - $i === 2){ |
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$bitBuffer->put($this->parseInt(substr($this->data, $i, 2)), 7); |
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} |
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// encode one remaining number in 4 bits |
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elseif($len - $i === 1){ |
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$bitBuffer->put($this->parseInt(substr($this->data, $i, 1)), 4); |
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} |
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} |
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} |
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/** |
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* get the code for the given numeric string |
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* |
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* @throws \chillerlan\QRCode\Data\QRCodeDataException on an illegal character occurence |
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*/ |
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protected function parseInt(string $string):int{ |
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$num = 0; |
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foreach(str_split($string) as $chr){ |
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$c = ord($chr); |
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if(!isset(self::CHAR_MAP_NUMBER[$chr])){ |
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throw new QRCodeDataException(sprintf('illegal char: "%s" [%d]', $chr, $c)); |
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} |
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$c = $c - 48; // ord('0') |
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$num = $num * 10 + $c; |
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} |
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return $num; |
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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_MAP_NUMBER); |
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// @todo |
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$toNumericChar = 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 three digits at a time |
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while($length >= 3){ |
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// Each 10 bits encodes three digits |
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if($bitBuffer->available() < 10){ |
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throw new QRCodeDataException('not enough bits available'); |
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} |
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$threeDigitsBits = $bitBuffer->read(10); |
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if($threeDigitsBits >= 1000){ |
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throw new QRCodeDataException('error decoding numeric value'); |
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} |
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$result .= $toNumericChar($threeDigitsBits / 100); |
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$result .= $toNumericChar(($threeDigitsBits / 10) % 10); |
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$result .= $toNumericChar($threeDigitsBits % 10); |
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$length -= 3; |
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} |
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if($length === 2){ |
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// Two digits left over to read, encoded in 7 bits |
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if($bitBuffer->available() < 7){ |
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throw new QRCodeDataException('not enough bits available'); |
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} |
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$twoDigitsBits = $bitBuffer->read(7); |
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if($twoDigitsBits >= 100){ |
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throw new QRCodeDataException('error decoding numeric value'); |
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} |
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$result .= $toNumericChar($twoDigitsBits / 10); |
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$result .= $toNumericChar($twoDigitsBits % 10); |
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} |
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elseif($length === 1){ |
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// One digit left over to read |
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if($bitBuffer->available() < 4){ |
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throw new QRCodeDataException('not enough bits available'); |
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} |
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$digitBits = $bitBuffer->read(4); |
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if($digitBits >= 10){ |
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throw new QRCodeDataException('error decoding numeric value'); |
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} |
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$result .= $toNumericChar($digitBits); |
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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
