Decoder::correctErrors() - Code Metrics - Inspection of "Deploying to gh-pages from @ chillerlan/php-qrcode..." - chillerlan/php-qrcode - Measure and Improve Code Quality continuously with Scrutinizer

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created 2021-11-18 13:01 UTC

Decoder::correctErrors() A

↳ Parent: Decoder

Complexity

Conditions	3
Paths	4

Size

Total Lines	17
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	3
eloc	7
c	1
b	0
f	0
nc	4
nop	2
dl	0
loc	17
rs	10

<?php
/**
 * Class Decoder
 *
 * @created      17.01.2021
 * @author       ZXing Authors
 * @author       Smiley <[email protected]>
 * @copyright    2021 Smiley
 * @license      Apache-2.0
 */

namespace chillerlan\QRCode\Decoder;

use Exception, InvalidArgumentException, RuntimeException;
use chillerlan\QRCode\Common\{BitBuffer, EccLevel, Mode, ReedSolomonDecoder, Version};
use chillerlan\QRCode\Data\{AlphaNum, Byte, ECI, Kanji, Number};
use chillerlan\QRCode\Detector\Detector;
use function count, array_fill, mb_convert_encoding, mb_detect_encoding;

/**
 * <p>The main class which implements QR Code decoding -- as opposed to locating and extracting
 * the QR Code from an image.</p>
 *
 * @author Sean Owen
 */
final class Decoder{

#	private const GB2312_SUBSET = 1;

	/**
	 * <p>Decodes a QR Code represented as a {@link \chillerlan\QRCode\Decoder\BitMatrix}.
	 * A 1 or "true" is taken to mean a black module.</p>
	 *
	 * @param \chillerlan\QRCode\Decoder\LuminanceSource $source
	 *
	 * @return \chillerlan\QRCode\Decoder\DecoderResult text and bytes encoded within the QR Code
	 * @throws \Exception if the QR Code cannot be decoded
	 */
	public function decode(LuminanceSource $source):DecoderResult{
		$matrix    = (new Binarizer($source))->getBlackMatrix();
		$bitMatrix = (new Detector($matrix))->detect();

		$fe = null;


		try{
			// Construct a parser and read version, error-correction level
			// clone the BitMatrix to avoid errors in case we run into mirroring
			return $this->decodeParser(new BitMatrixParser(clone $bitMatrix));
		}
		catch(Exception $e){
			$fe = $e;
		}

		try{
			$parser = new BitMatrixParser(clone $bitMatrix);

			// Will be attempting a mirrored reading of the version and format info.
			$parser->setMirror(true);

			// Preemptively read the version.
#			$parser->readVersion();

			// Preemptively read the format information.
#			$parser->readFormatInformation();

			/*
			 * Since we're here, this means we have successfully detected some kind
			 * of version and format information when mirrored. This is a good sign,
			 * that the QR code may be mirrored, and we should try once more with a
			 * mirrored content.
			 */
			// Prepare for a mirrored reading.
			$parser->mirror();

			return $this->decodeParser($parser);
		}
		catch(Exception $e){
			// Throw the exception from the original reading
			if($fe instanceof Exception){

				throw $fe;
			}

			throw $e;
		}

	}

	/**
	 * @param \chillerlan\QRCode\Decoder\BitMatrixParser $parser
	 *
	 * @return \chillerlan\QRCode\Decoder\DecoderResult
	 */
	private function decodeParser(BitMatrixParser $parser):DecoderResult{
		$version  = $parser->readVersion();
		$eccLevel = $parser->readFormatInformation()->getErrorCorrectionLevel();

		// Read raw codewords
		$rawCodewords  = $parser->readCodewords();
		// Separate into data blocks
		$dataBlocks = $this->getDataBlocks($rawCodewords, $version, $eccLevel);

		$resultBytes  = [];
		$resultOffset = 0;

		// Error-correct and copy data blocks together into a stream of bytes
		foreach($dataBlocks as $dataBlock){
			[$numDataCodewords, $codewordBytes] = $dataBlock;

			$corrected = $this->correctErrors($codewordBytes, $numDataCodewords);

			for($i = 0; $i < $numDataCodewords; $i++){
				$resultBytes[$resultOffset++] = $corrected[$i];
			}
		}

		// Decode the contents of that stream of bytes
		return $this->decodeBitStream($resultBytes, $version, $eccLevel);
	}

	/**
	 * <p>When QR Codes use multiple data blocks, they are actually interleaved.
	 * That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
	 * method will separate the data into original blocks.</p>
	 *
	 * @param array                              $rawCodewords bytes as read directly from the QR Code
	 * @param \chillerlan\QRCode\Common\Version  $version      version of the QR Code
	 * @param \chillerlan\QRCode\Common\EccLevel $eccLevel     error-correction level of the QR Code
	 *
	 * @return array DataBlocks containing original bytes, "de-interleaved" from representation in the QR Code
	 * @throws \InvalidArgumentException
	 */
	private function getDataBlocks(array $rawCodewords, Version $version, EccLevel $eccLevel):array{

		if(count($rawCodewords) !== $version->getTotalCodewords()){
			throw new InvalidArgumentException('$rawCodewords differ from total codewords for version');
		}

		// Figure out the number and size of data blocks used by this version and
		// error correction level
		[$numEccCodewords, $eccBlocks] = $version->getRSBlocks($eccLevel);

		// Now establish DataBlocks of the appropriate size and number of data codewords
		$result          = [];//new DataBlock[$totalBlocks];
		$numResultBlocks = 0;

		foreach($eccBlocks as $blockData){
			[$numEccBlocks, $eccPerBlock] = $blockData;

			for($i = 0; $i < $numEccBlocks; $i++, $numResultBlocks++){
				$result[$numResultBlocks] = [$eccPerBlock, array_fill(0, $numEccCodewords + $eccPerBlock, 0)];
			}
		}

		// All blocks have the same amount of data, except that the last n
		// (where n may be 0) have 1 more byte. Figure out where these start.
		/** @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset */
		$shorterBlocksTotalCodewords = count($result[0][1]);
		$longerBlocksStartAt         = count($result) - 1;

		while($longerBlocksStartAt >= 0){
			$numCodewords = count($result[$longerBlocksStartAt][1]);

			if($numCodewords == $shorterBlocksTotalCodewords){
				break;
			}

			$longerBlocksStartAt--;
		}

		$longerBlocksStartAt++;

		$shorterBlocksNumDataCodewords = $shorterBlocksTotalCodewords - $numEccCodewords;
		// The last elements of result may be 1 element longer;
		// first fill out as many elements as all of them have
		$rawCodewordsOffset = 0;

		for($i = 0; $i < $shorterBlocksNumDataCodewords; $i++){
			for($j = 0; $j < $numResultBlocks; $j++){
				$result[$j][1][$i] = $rawCodewords[$rawCodewordsOffset++];
			}
		}

		// Fill out the last data block in the longer ones
		for($j = $longerBlocksStartAt; $j < $numResultBlocks; $j++){
			$result[$j][1][$shorterBlocksNumDataCodewords] = $rawCodewords[$rawCodewordsOffset++];
		}

		// Now add in error correction blocks
		/** @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset */
		$max = count($result[0][1]);

		for($i = $shorterBlocksNumDataCodewords; $i < $max; $i++){
			for($j = 0; $j < $numResultBlocks; $j++){
				$iOffset                 = $j < $longerBlocksStartAt ? $i : $i + 1;
				$result[$j][1][$iOffset] = $rawCodewords[$rawCodewordsOffset++];
			}
		}

		return $result;
	}

	/**
	 * <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
	 * correct the errors in-place using Reed-Solomon error correction.</p>
	 */
	private function correctErrors(array $codewordBytes, int $numDataCodewords):array{
		// First read into an array of ints
		$codewordsInts = [];

		foreach($codewordBytes as $i => $codewordByte){
			$codewordsInts[$i] = $codewordByte & 0xFF;
		}

		$decoded = (new ReedSolomonDecoder)->decode($codewordsInts, (count($codewordBytes) - $numDataCodewords));

		// Copy back into array of bytes -- only need to worry about the bytes that were data
		// We don't care about errors in the error-correction codewords
		for($i = 0; $i < $numDataCodewords; $i++){
			$codewordBytes[$i] = $decoded[$i];
		}

		return $codewordBytes;
	}

	/**
	 * @throws \RuntimeException
	 */
	private function decodeBitStream(array $bytes, Version $version, EccLevel $ecLevel):DecoderResult{
		$bits           = new BitBuffer($bytes);
		$symbolSequence = -1;
		$parityData     = -1;
		$versionNumber  = $version->getVersionNumber();

		$result      = '';
		$eciCharset  = null;
#		$fc1InEffect = false;

		// While still another segment to read...
		while($bits->available() >= 4){
			$datamode = $bits->read(4); // mode is encoded by 4 bits

			// OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
			if($datamode === Mode::DATA_TERMINATOR){
				break;
			}

			if($datamode === Mode::DATA_ECI){
				// Count doesn't apply to ECI
				$eciCharset = ECI::parseValue($bits);
			}
			/** @noinspection PhpStatementHasEmptyBodyInspection */
			elseif($datamode === Mode::DATA_FNC1_FIRST || $datamode === Mode::DATA_FNC1_SECOND){
				// We do little with FNC1 except alter the parsed result a bit according to the spec
#				$fc1InEffect = true;
			}
			elseif($datamode === Mode::DATA_STRCTURED_APPEND){
				if($bits->available() < 16){
					throw new RuntimeException('structured append: not enough bits left');
				}
				// sequence number and parity is added later to the result metadata
				// Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
				$symbolSequence = $bits->read(8);
				$parityData     = $bits->read(8);
			}
			else{
				// First handle Hanzi mode which does not start with character count
/*				if($datamode === Mode::DATA_HANZI){
					//chinese mode contains a sub set indicator right after mode indicator
					$subset = $bits->read(4);
					$length = $bits->read(Mode::getLengthBitsForVersion($datamode, $versionNumber));
					if($subset === self::GB2312_SUBSET){
						$result .= $this->decodeHanziSegment($bits, $length);
					}
				}*/
#				else{
					// "Normal" QR code modes:
					if($datamode === Mode::DATA_NUMBER){
						$result .= Number::decodeSegment($bits, $versionNumber);
					}
					elseif($datamode === Mode::DATA_ALPHANUM){
						$str = AlphaNum::decodeSegment($bits, $versionNumber);

						// See section 6.4.8.1, 6.4.8.2
/*						if($fc1InEffect){
							$start = \strlen($str);
							// We need to massage the result a bit if in an FNC1 mode:
							for($i = $start; $i < $start; $i++){
								if($str[$i] === '%'){
									if($i < $start - 1 && $str[$i + 1] === '%'){
										// %% is rendered as %
										$str = \substr_replace($str, '', $i + 1, 1);//deleteCharAt(i + 1);
									}
#									else{
										// In alpha mode, % should be converted to FNC1 separator 0x1D @todo
#										$str = setCharAt($i, \chr(0x1D)); // ???
#									}
								}
							}
						}
*/
						$result .= $str;
					}
					elseif($datamode === Mode::DATA_BYTE){
						$str = Byte::decodeSegment($bits, $versionNumber);

						if($eciCharset !== null){
							$encoding = $eciCharset->getName();

							if($encoding === null){
								// The spec isn't clear on this mode; see
								// section 6.4.5: t does not say which encoding to assuming
								// upon decoding. I have seen ISO-8859-1 used as well as
								// Shift_JIS -- without anything like an ECI designator to
								// give a hint.
								$encoding = mb_detect_encoding($str, ['ISO-8859-1', 'SJIS', 'UTF-8']);
							}

							$eciCharset = null;
							$str = mb_convert_encoding($str, $encoding);
						}

						$result .= $str;
					}
					elseif($datamode === Mode::DATA_KANJI){
						$result .= Kanji::decodeSegment($bits, $versionNumber);
					}
					else{
						throw new RuntimeException('invalid data mode');
					}
#				}
			}
		}

		return new DecoderResult($bytes, $result, $version, $ecLevel, $symbolSequence, $parityData);
	}

}


1			<?php
2			/**
3			* Class Decoder
4			*
5			* @created 17.01.2021
6			* @author ZXing Authors
7			* @author Smiley <[email protected]>
8			* @copyright 2021 Smiley
9			* @license Apache-2.0
10			*/
11
12			namespace chillerlan\QRCode\Decoder;
13
14			use Exception, InvalidArgumentException, RuntimeException;
15			use chillerlan\QRCode\Common\{BitBuffer, EccLevel, Mode, ReedSolomonDecoder, Version};
16			use chillerlan\QRCode\Data\{AlphaNum, Byte, ECI, Kanji, Number};
17			use chillerlan\QRCode\Detector\Detector;
18			use function count, array_fill, mb_convert_encoding, mb_detect_encoding;
19
20			/**
21			* <p>The main class which implements QR Code decoding -- as opposed to locating and extracting
22			* the QR Code from an image.</p>
23			*
24			* @author Sean Owen
25			*/
26			final class Decoder{
27
28			# private const GB2312_SUBSET = 1;
29
30			/**
31			* <p>Decodes a QR Code represented as a {@link \chillerlan\QRCode\Decoder\BitMatrix}.
32			* A 1 or "true" is taken to mean a black module.</p>
33			*
34			* @param \chillerlan\QRCode\Decoder\LuminanceSource $source
35			*
36			* @return \chillerlan\QRCode\Decoder\DecoderResult text and bytes encoded within the QR Code
37			* @throws \Exception if the QR Code cannot be decoded
38			*/
39			public function decode(LuminanceSource $source):DecoderResult{
40			$matrix = (new Binarizer($source))->getBlackMatrix();
41			$bitMatrix = (new Detector($matrix))->detect();
42
43			$fe = null;
			0 ignored issues – show Unused Code introduced 2021-01-24 23:46 UTC by Report Bug Copy Issue Report The assignment to `$fe` is dead and can be removed. Loading history...
44
45			try{
46			// Construct a parser and read version, error-correction level
47			// clone the BitMatrix to avoid errors in case we run into mirroring
48			return $this->decodeParser(new BitMatrixParser(clone $bitMatrix));
49			}
50			catch(Exception $e){
51			$fe = $e;
52			}
53
54			try{
55			$parser = new BitMatrixParser(clone $bitMatrix);
56
57			// Will be attempting a mirrored reading of the version and format info.
58			$parser->setMirror(true);
59
60			// Preemptively read the version.
61			# $parser->readVersion();
62
63			// Preemptively read the format information.
64			# $parser->readFormatInformation();
65
66			/*
67			* Since we're here, this means we have successfully detected some kind
68			* of version and format information when mirrored. This is a good sign,
69			* that the QR code may be mirrored, and we should try once more with a
70			* mirrored content.
71			*/
72			// Prepare for a mirrored reading.
73			$parser->mirror();
74
75			return $this->decodeParser($parser);
76			}
77			catch(Exception $e){
78			// Throw the exception from the original reading
79			if($fe instanceof Exception){
			0 ignored issues – show introduced 2021-01-24 23:46 UTC by Report Bug Copy Issue Report `$fe` is always a sub-type of `Exception`. Loading history...
80			throw $fe;
81			}
82
83			throw $e;
84			}
85
86			}
87
88			/**
89			* @param \chillerlan\QRCode\Decoder\BitMatrixParser $parser
90			*
91			* @return \chillerlan\QRCode\Decoder\DecoderResult
92			*/
93			private function decodeParser(BitMatrixParser $parser):DecoderResult{
94			$version = $parser->readVersion();
95			$eccLevel = $parser->readFormatInformation()->getErrorCorrectionLevel();
96
97			// Read raw codewords
98			$rawCodewords = $parser->readCodewords();
99			// Separate into data blocks
100			$dataBlocks = $this->getDataBlocks($rawCodewords, $version, $eccLevel);
101
102			$resultBytes = [];
103			$resultOffset = 0;
104
105			// Error-correct and copy data blocks together into a stream of bytes
106			foreach($dataBlocks as $dataBlock){
107			[$numDataCodewords, $codewordBytes] = $dataBlock;
108
109			$corrected = $this->correctErrors($codewordBytes, $numDataCodewords);
110
111			for($i = 0; $i < $numDataCodewords; $i++){
112			$resultBytes[$resultOffset++] = $corrected[$i];
113			}
114			}
115
116			// Decode the contents of that stream of bytes
117			return $this->decodeBitStream($resultBytes, $version, $eccLevel);
118			}
119
120			/**
121			* <p>When QR Codes use multiple data blocks, they are actually interleaved.
122			* That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
123			* method will separate the data into original blocks.</p>
124			*
125			* @param array $rawCodewords bytes as read directly from the QR Code
126			* @param \chillerlan\QRCode\Common\Version $version version of the QR Code
127			* @param \chillerlan\QRCode\Common\EccLevel $eccLevel error-correction level of the QR Code
128			*
129			* @return array DataBlocks containing original bytes, "de-interleaved" from representation in the QR Code
130			* @throws \InvalidArgumentException
131			*/
132			private function getDataBlocks(array $rawCodewords, Version $version, EccLevel $eccLevel):array{
133
134			if(count($rawCodewords) !== $version->getTotalCodewords()){
135			throw new InvalidArgumentException('$rawCodewords differ from total codewords for version');
136			}
137
138			// Figure out the number and size of data blocks used by this version and
139			// error correction level
140			[$numEccCodewords, $eccBlocks] = $version->getRSBlocks($eccLevel);
141
142			// Now establish DataBlocks of the appropriate size and number of data codewords
143			$result = [];//new DataBlock[$totalBlocks];
144			$numResultBlocks = 0;
145
146			foreach($eccBlocks as $blockData){
147			[$numEccBlocks, $eccPerBlock] = $blockData;
148
149			for($i = 0; $i < $numEccBlocks; $i++, $numResultBlocks++){
150			$result[$numResultBlocks] = [$eccPerBlock, array_fill(0, $numEccCodewords + $eccPerBlock, 0)];
151			}
152			}
153
154			// All blocks have the same amount of data, except that the last n
155			// (where n may be 0) have 1 more byte. Figure out where these start.
156			/** @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset */
157			$shorterBlocksTotalCodewords = count($result[0][1]);
158			$longerBlocksStartAt = count($result) - 1;
159
160			while($longerBlocksStartAt >= 0){
161			$numCodewords = count($result[$longerBlocksStartAt][1]);
162
163			if($numCodewords == $shorterBlocksTotalCodewords){
164			break;
165			}
166
167			$longerBlocksStartAt--;
168			}
169
170			$longerBlocksStartAt++;
171
172			$shorterBlocksNumDataCodewords = $shorterBlocksTotalCodewords - $numEccCodewords;
173			// The last elements of result may be 1 element longer;
174			// first fill out as many elements as all of them have
175			$rawCodewordsOffset = 0;
176
177			for($i = 0; $i < $shorterBlocksNumDataCodewords; $i++){
178			for($j = 0; $j < $numResultBlocks; $j++){
179			$result[$j][1][$i] = $rawCodewords[$rawCodewordsOffset++];
180			}
181			}
182
183			// Fill out the last data block in the longer ones
184			for($j = $longerBlocksStartAt; $j < $numResultBlocks; $j++){
185			$result[$j][1][$shorterBlocksNumDataCodewords] = $rawCodewords[$rawCodewordsOffset++];
186			}
187
188			// Now add in error correction blocks
189			/** @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset */
190			$max = count($result[0][1]);
191
192			for($i = $shorterBlocksNumDataCodewords; $i < $max; $i++){
193			for($j = 0; $j < $numResultBlocks; $j++){
194			$iOffset = $j < $longerBlocksStartAt ? $i : $i + 1;
195			$result[$j][1][$iOffset] = $rawCodewords[$rawCodewordsOffset++];
196			}
197			}
198
199			return $result;
200			}
201
202			/**
203			* <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
204			* correct the errors in-place using Reed-Solomon error correction.</p>
205			*/
206			private function correctErrors(array $codewordBytes, int $numDataCodewords):array{
207			// First read into an array of ints
208			$codewordsInts = [];
209
210			foreach($codewordBytes as $i => $codewordByte){
211			$codewordsInts[$i] = $codewordByte & 0xFF;
212			}
213
214			$decoded = (new ReedSolomonDecoder)->decode($codewordsInts, (count($codewordBytes) - $numDataCodewords));
215
216			// Copy back into array of bytes -- only need to worry about the bytes that were data
217			// We don't care about errors in the error-correction codewords
218			for($i = 0; $i < $numDataCodewords; $i++){
219			$codewordBytes[$i] = $decoded[$i];
220			}
221
222			return $codewordBytes;
223			}
224
225			/**
226			* @throws \RuntimeException
227			*/
228			private function decodeBitStream(array $bytes, Version $version, EccLevel $ecLevel):DecoderResult{
229			$bits = new BitBuffer($bytes);
230			$symbolSequence = -1;
231			$parityData = -1;
232			$versionNumber = $version->getVersionNumber();
233
234			$result = '';
235			$eciCharset = null;
236			# $fc1InEffect = false;
237
238			// While still another segment to read...
239			while($bits->available() >= 4){
240			$datamode = $bits->read(4); // mode is encoded by 4 bits
241
242			// OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
243			if($datamode === Mode::DATA_TERMINATOR){
244			break;
245			}
246
247			if($datamode === Mode::DATA_ECI){
248			// Count doesn't apply to ECI
249			$eciCharset = ECI::parseValue($bits);
250			}
251			/** @noinspection PhpStatementHasEmptyBodyInspection */
252			elseif($datamode === Mode::DATA_FNC1_FIRST \|\| $datamode === Mode::DATA_FNC1_SECOND){
253			// We do little with FNC1 except alter the parsed result a bit according to the spec
254			# $fc1InEffect = true;
255			}
256			elseif($datamode === Mode::DATA_STRCTURED_APPEND){
257			if($bits->available() < 16){
258			throw new RuntimeException('structured append: not enough bits left');
259			}
260			// sequence number and parity is added later to the result metadata
261			// Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
262			$symbolSequence = $bits->read(8);
263			$parityData = $bits->read(8);
264			}
265			else{
266			// First handle Hanzi mode which does not start with character count
267			/* if($datamode === Mode::DATA_HANZI){
268			//chinese mode contains a sub set indicator right after mode indicator
269			$subset = $bits->read(4);
270			$length = $bits->read(Mode::getLengthBitsForVersion($datamode, $versionNumber));
271			if($subset === self::GB2312_SUBSET){
272			$result .= $this->decodeHanziSegment($bits, $length);
273			}
274			}*/
275			# else{
276			// "Normal" QR code modes:
277			if($datamode === Mode::DATA_NUMBER){
278			$result .= Number::decodeSegment($bits, $versionNumber);
279			}
280			elseif($datamode === Mode::DATA_ALPHANUM){
281			$str = AlphaNum::decodeSegment($bits, $versionNumber);
282
283			// See section 6.4.8.1, 6.4.8.2
284			/* if($fc1InEffect){
285			$start = \strlen($str);
286			// We need to massage the result a bit if in an FNC1 mode:
287			for($i = $start; $i < $start; $i++){
288			if($str[$i] === '%'){
289			if($i < $start - 1 && $str[$i + 1] === '%'){
290			// %% is rendered as %
291			$str = \substr_replace($str, '', $i + 1, 1);//deleteCharAt(i + 1);
292			}
293			# else{
294			// In alpha mode, % should be converted to FNC1 separator 0x1D @todo
295			# $str = setCharAt($i, \chr(0x1D)); // ???
296			# }
297			}
298			}
299			}
300			*/
301			$result .= $str;
302			}
303			elseif($datamode === Mode::DATA_BYTE){
304			$str = Byte::decodeSegment($bits, $versionNumber);
305
306			if($eciCharset !== null){
307			$encoding = $eciCharset->getName();
308
309			if($encoding === null){
310			// The spec isn't clear on this mode; see
311			// section 6.4.5: t does not say which encoding to assuming
312			// upon decoding. I have seen ISO-8859-1 used as well as
313			// Shift_JIS -- without anything like an ECI designator to
314			// give a hint.
315			$encoding = mb_detect_encoding($str, ['ISO-8859-1', 'SJIS', 'UTF-8']);
316			}
317
318			$eciCharset = null;
319			$str = mb_convert_encoding($str, $encoding);
320			}
321
322			$result .= $str;
323			}
324			elseif($datamode === Mode::DATA_KANJI){
325			$result .= Kanji::decodeSegment($bits, $versionNumber);
326			}
327			else{
328			throw new RuntimeException('invalid data mode');
329			}
330			# }
331			}
332			}
333
334			return new DecoderResult($bytes, $result, $version, $ecLevel, $symbolSequence, $parityData);
335			}
336
337			}
338

chillerlan / php-qrcode

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Decoder::correctErrors() A

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