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<?php
/**
* Class Hanzi
*
* @created 19.11.2020
* @author smiley <smiley@chillerlan.net>
* @copyright 2020 smiley
* @license MIT
*/
namespace chillerlan\QRCode\Data;
use chillerlan\QRCode\Common\{BitBuffer, Mode};
use Throwable;
use function chr, implode, intdiv, is_string, mb_convert_encoding, mb_detect_encoding,
mb_internal_encoding, mb_strlen, ord, sprintf, strlen;
/**
* Hanzi (simplified Chinese) mode, GBT18284-2000: 13-bit double-byte characters from the GB2312/GB18030 character set
*
* Please note that this is not part of the QR Code specification and may not be supported by all readers (ZXing-based ones do).
*
* @see https://en.wikipedia.org/wiki/GB_2312
* @see http://www.herongyang.com/GB2312/Introduction-of-GB2312.html
* @see https://en.wikipedia.org/wiki/GBK_(character_encoding)#Encoding
* @see https://gist.github.com/codemasher/91da33c44bfb48a81a6c1426bb8e4338
* @see https://github.com/zxing/zxing/blob/dfb06fa33b17a9e68321be151c22846c7b78048f/core/src/main/java/com/google/zxing/qrcode/decoder/DecodedBitStreamParser.java#L172-L209
* @see https://www.chinesestandard.net/PDF/English.aspx/GBT18284-2000
*/
final class Hanzi extends QRDataModeAbstract{
/**
* possible values: GB2312, GB18030
*
* @var string
*/
public const ENCODING = 'GB18030';
/**
* @todo: other subsets???
*
* @var int
*/
public const GB2312_SUBSET = 0b0001;
/**
* @inheritDoc
*/
public const DATAMODE = Mode::HANZI;
/**
* @inheritDoc
*/
protected function getCharCount():int{
return mb_strlen($this->data, self::ENCODING);
}
/**
* @inheritDoc
*/
public function getLengthInBits():int{
return ($this->getCharCount() * 13);
}
/**
* @inheritDoc
* @throws \chillerlan\QRCode\Data\QRCodeDataException
*/
public static function convertEncoding(string $string):string{
$detected = mb_detect_encoding(
$string,
[mb_internal_encoding(), 'UTF-8', 'GB2312', 'GB18030', 'CP936', 'EUC-CN', 'HZ'],
true,
);
if($detected === false){
throw new QRCodeDataException('mb_detect_encoding error');
}
if($detected === self::ENCODING){
return $string;
}
$string = mb_convert_encoding($string, self::ENCODING, $detected);
if(!is_string($string)){
throw new QRCodeDataException('mb_convert_encoding error');
}
return $string;
}
/**
* checks if a string qualifies as Hanzi/GB2312
*/
public static function validateString(string $string):bool{
try{
$string = self::convertEncoding($string);
}
catch(Throwable $e){
return false;
}
$len = strlen($string);
if($len < 2 || ($len % 2) !== 0){
return false;
}
for($i = 0; $i < $len; $i += 2){
$byte1 = ord($string[$i]);
$byte2 = ord($string[($i + 1)]);
// byte 1 unused ranges
if($byte1 < 0xa1 || ($byte1 > 0xa9 && $byte1 < 0xb0) || $byte1 > 0xf7){
return false;
}
// byte 2 unused ranges
if($byte2 < 0xa1 || $byte2 > 0xfe){
return false;
}
}
return true;
}
/**
* @inheritDoc
*
* @throws \chillerlan\QRCode\Data\QRCodeDataException on an illegal character occurence
*/
public function write(BitBuffer $bitBuffer, int $versionNumber):QRDataModeInterface{
$bitBuffer
->put(self::DATAMODE, 4)
->put($this::GB2312_SUBSET, 4)
->put($this->getCharCount(), $this::getLengthBits($versionNumber))
;
$len = strlen($this->data);
for($i = 0; ($i + 1) < $len; $i += 2){
$c = (((0xff & ord($this->data[$i])) << 8) | (0xff & ord($this->data[($i + 1)])));
if($c >= 0xa1a1 && $c <= 0xaafe){
$c -= 0x0a1a1;
}
elseif($c >= 0xb0a1 && $c <= 0xfafe){
$c -= 0x0a6a1;
}
else{
throw new QRCodeDataException(sprintf('illegal char at %d [%d]', ($i + 1), $c));
}
$bitBuffer->put((((($c >> 8) & 0xff) * 0x060) + ($c & 0xff)), 13);
}
if($i < $len){
throw new QRCodeDataException(sprintf('illegal char at %d', ($i + 1)));
}
return $this;
}
/**
* See specification GBT 18284-2000
*
* @throws \chillerlan\QRCode\Data\QRCodeDataException
*/
public static function decodeSegment(BitBuffer $bitBuffer, int $versionNumber):string{
// Hanzi mode contains a subset indicator right after mode indicator
if($bitBuffer->read(4) !== self::GB2312_SUBSET){
throw new QRCodeDataException('ecpected subset indicator for Hanzi mode');
}
$length = $bitBuffer->read(self::getLengthBits($versionNumber));
if($bitBuffer->available() < ($length * 13)){
throw new QRCodeDataException('not enough bits available');
}
// Each character will require 2 bytes. Read the characters as 2-byte pairs and decode as GB2312 afterwards
$buffer = [];
$offset = 0;
while($length > 0){
// Each 13 bits encodes a 2-byte character
$twoBytes = $bitBuffer->read(13);
$assembledTwoBytes = ((intdiv($twoBytes, 0x060) << 8) | ($twoBytes % 0x060));
$assembledTwoBytes += ($assembledTwoBytes < 0x00a00) // 0x003BF
? 0x0a1a1 // In the 0xA1A1 to 0xAAFE range
: 0x0a6a1; // In the 0xB0A1 to 0xFAFE range
$buffer[$offset] = chr(0xff & ($assembledTwoBytes >> 8));
$buffer[($offset + 1)] = chr(0xff & $assembledTwoBytes);
$offset += 2;
$length--;
}
return mb_convert_encoding(implode('', $buffer), mb_internal_encoding(), self::ENCODING);
}
}
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