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<?php |
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/** |
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* Class Kanji |
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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 chr, implode, mb_convert_encoding, mb_detect_encoding, mb_internal_encoding, mb_strlen, ord, sprintf, strlen; |
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/** |
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* Kanji mode: double-byte characters from the Shift JIS character set |
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* |
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* ISO/IEC 18004:2000 Section 8.3.5 |
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* ISO/IEC 18004:2000 Section 8.4.5 |
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*/ |
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final class Kanji extends QRDataModeAbstract{ |
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/** |
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* @inheritDoc |
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*/ |
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protected static int $datamode = Mode::KANJI; |
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/** |
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* |
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*/ |
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public function __construct(string $data){ |
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parent::__construct($data); |
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$this->data = mb_convert_encoding($this->data, 'SJIS', mb_detect_encoding($this->data)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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protected function getCharCount():int{ |
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return mb_strlen($this->data, 'SJIS'); |
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} |
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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 $this->getCharCount() * 13; |
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} |
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/** |
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* checks if a string qualifies as Kanji |
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*/ |
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public static function validateString(string $string):bool{ |
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$i = 0; |
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$len = strlen($string); |
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if($len < 2){ |
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return false; |
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} |
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while($i + 1 < $len){ |
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$c = ((0xff & ord($string[$i])) << 8) | (0xff & ord($string[$i + 1])); |
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if(!($c >= 0x8140 && $c <= 0x9ffc) && !($c >= 0xe040 && $c <= 0xebbf)){ |
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return false; |
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} |
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$i += 2; |
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} |
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return $i >= $len; |
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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 on an illegal character occurence |
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*/ |
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public function write(BitBuffer $bitBuffer, int $versionNumber):void{ |
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$bitBuffer |
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->put($this::$datamode, 4) |
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->put($this->getCharCount(), Mode::getLengthBitsForVersion($this::$datamode, $versionNumber)) |
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; |
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$len = strlen($this->data); |
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for($i = 0; $i + 1 < $len; $i += 2){ |
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$c = ((0xff & ord($this->data[$i])) << 8) | (0xff & ord($this->data[$i + 1])); |
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if($c >= 0x8140 && $c <= 0x9ffC){ |
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$c -= 0x8140; |
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} |
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elseif($c >= 0xe040 && $c <= 0xebbf){ |
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$c -= 0xc140; |
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} |
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else{ |
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throw new QRCodeDataException(sprintf('illegal char at %d [%d]', $i + 1, $c)); |
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} |
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$bitBuffer->put(((($c >> 8) & 0xff) * 0xc0) + ($c & 0xff), 13); |
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} |
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if($i < $len){ |
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throw new QRCodeDataException(sprintf('illegal char at %d', $i + 1)); |
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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, $versionNumber)); |
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if($bitBuffer->available() < $length * 13){ |
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throw new QRCodeDataException('not enough bits available'); |
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} |
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$buffer = []; |
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$offset = 0; |
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while($length > 0){ |
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// Each 13 bits encodes a 2-byte character |
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$twoBytes = $bitBuffer->read(13); |
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$assembledTwoBytes = (($twoBytes / 0x0c0) << 8) | ($twoBytes % 0x0c0); |
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$assembledTwoBytes += ($assembledTwoBytes < 0x01f00) |
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? 0x08140 // In the 0x8140 to 0x9FFC range |
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: 0x0c140; // In the 0xE040 to 0xEBBF range |
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$buffer[$offset] = chr(0xff & ($assembledTwoBytes >> 8)); |
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$buffer[$offset + 1] = chr(0xff & $assembledTwoBytes); |
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$offset += 2; |
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$length--; |
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} |
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return mb_convert_encoding(implode($buffer), mb_internal_encoding(), 'SJIS'); |
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} |
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} |
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chillerlan /
php-qrcode
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