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<?php |
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|
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/** |
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* Class Number |
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* |
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* @created 26.11.2015 |
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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, substr, unpack; |
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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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/** |
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* @inheritDoc |
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*/ |
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public const DATAMODE = Mode::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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{ |
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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 $string) : bool |
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{ |
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return (bool) \preg_match('/^\\d+$/', $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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$i = 0; |
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// encode numeric triplets in 10 bits |
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while ($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, $i, 2)), 7); |
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} elseif ($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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return $this; |
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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 |
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*/ |
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private function parseInt(string $string) : int |
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{ |
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$num = 0; |
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$ords = unpack('C*', $string); |
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if ($ords === \false) { |
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throw new QRCodeDataException('unpack() error'); |
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} |
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foreach ($ords as $ord) { |
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$num = $num * 10 + $ord - 48; |
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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 $versionNumber) : string |
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{ |
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$length = $bitBuffer->read(self::getLengthBits($versionNumber)); |
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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 ($bitBuffer->available() < 10) { |
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throw new QRCodeDataException('not enough bits available'); |
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// @codeCoverageIgnore |
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} |
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$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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$result .= intdiv($threeDigitsBits, 100); |
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$result .= intdiv($threeDigitsBits, 10) % 10; |
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$result .= $threeDigitsBits % 10; |
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$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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// @codeCoverageIgnore |
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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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$result .= intdiv($twoDigitsBits, 10); |
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$result .= $twoDigitsBits % 10; |
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} elseif ($length === 1) { |
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// One digit left over to read |
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if ($bitBuffer->available() < 4) { |
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throw new QRCodeDataException('not enough bits available'); |
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// @codeCoverageIgnore |
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} |
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$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 .= $digitBits; |
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} |
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return $result; |
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} |
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} |
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