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<?php |
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|
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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 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 Throwable; |
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use function chr, implode, intdiv, is_string, mb_convert_encoding, mb_detect_encoding, mb_internal_encoding, mb_strlen, ord, sprintf, strlen; |
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/** |
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* Kanji mode: 13-bit 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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* @see https://en.wikipedia.org/wiki/Shift_JIS#As_defined_in_JIS_X_0208:1997 |
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* @see http://www.rikai.com/library/kanjitables/kanji_codes.sjis.shtml |
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* @see https://gist.github.com/codemasher/d07d3e6e9346c08e7a41b8b978784952 |
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*/ |
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final class Kanji extends QRDataModeAbstract |
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{ |
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/** |
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* possible values: SJIS, SJIS-2004 |
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* |
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* SJIS-2004 may produce errors in PHP < 8 |
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* |
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* @var string |
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*/ |
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public const ENCODING = 'SJIS'; |
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/** |
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* @inheritDoc |
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*/ |
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public const DATAMODE = Mode::KANJI; |
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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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{ |
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return mb_strlen($this->data, self::ENCODING); |
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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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{ |
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return $this->getCharCount() * 13; |
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} |
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/** |
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* @inheritDoc |
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* @throws \chillerlan\QRCode\Data\QRCodeDataException |
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*/ |
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public static function convertEncoding(string $string) : string |
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{ |
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$detected = mb_detect_encoding($string, [mb_internal_encoding(), 'UTF-8', 'SJIS', 'SJIS-2004'], \true); |
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if ($detected === \false) { |
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throw new QRCodeDataException('mb_detect_encoding error'); |
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} |
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if ($detected === self::ENCODING) { |
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return $string; |
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} |
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$string = mb_convert_encoding($string, self::ENCODING, $detected); |
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if (!is_string($string)) { |
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throw new QRCodeDataException(sprintf('invalid encoding: %s', $detected)); |
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} |
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return $string; |
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} |
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/** |
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* checks if a string qualifies as SJIS Kanji |
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*/ |
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public static function validateString(string $string) : bool |
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{ |
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try { |
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$string = self::convertEncoding($string); |
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} catch (Throwable $e) { |
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return \false; |
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} |
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$len = strlen($string); |
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if ($len < 2 || $len % 2 !== 0) { |
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return \false; |
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} |
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for ($i = 0; $i < $len; $i += 2) { |
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$byte1 = ord($string[$i]); |
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$byte2 = ord($string[$i + 1]); |
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// byte 1 unused and vendor ranges |
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if ($byte1 < 0x81 || $byte1 > 0x84 && $byte1 < 0x88 || $byte1 > 0x9f && $byte1 < 0xe0 || $byte1 > 0xea) { |
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return \false; |
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} |
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// byte 2 unused ranges |
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if ($byte2 < 0x40 || $byte2 === 0x7f || $byte2 > 0xfc) { |
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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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* @throws \chillerlan\QRCode\Data\QRCodeDataException on an illegal character occurence |
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*/ |
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public function write(BitBuffer $bitBuffer, int $versionNumber) : QRDataModeInterface |
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{ |
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$bitBuffer->put(self::DATAMODE, 4)->put($this->getCharCount(), $this::getLengthBits($versionNumber)); |
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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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} elseif ($c >= 0xe040 && $c <= 0xebbf) { |
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$c -= 0xc140; |
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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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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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if ($bitBuffer->available() < $length * 13) { |
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throw new QRCodeDataException('not enough bits available'); |
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// @codeCoverageIgnore |
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} |
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// Each character will require 2 bytes. Read the characters as 2-byte pairs and decode as SJIS afterwards |
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$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 = intdiv($twoBytes, 0xc0) << 8 | $twoBytes % 0xc0; |
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$assembledTwoBytes += $assembledTwoBytes < 0x1f00 ? 0x8140 : 0xc140; |
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// In the 0xE040 to 0xEBBF range |
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$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(), self::ENCODING); |
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} |
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} |
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