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<?php /* * Copyright 2007 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace Zxing\Qrcode\Decoder; use Zxing\ChecksumException; use Zxing\DecodeHintType; use Zxing\FormatException; use Zxing\Common\BitMatrix; use Zxing\Common\DecoderResult; use Zxing\Common\Reedsolomon\GenericGF; use Zxing\Common\Reedsolomon\ReedSolomonDecoder; use Zxing\Common\Reedsolomon\ReedSolomonException; /** * <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 $rsDecoder; public function __construct() { $this->rsDecoder = new ReedSolomonDecoder(GenericGF::$QR_CODE_FIELD_256); } function decode($variable, $hints=null){ if(is_array($variable)){ return $this->decodeImage($variable,$hints); }elseif(is_object($variable)&&$variable instanceof BitMatrix){ return $this->decodeBits($variable,$hints); }elseif(is_object($variable)&&$variable instanceof BitMatrixParser){ return $this->decodeParser($variable,$hints); }else{ die('decode error Decoder.php'); } } /** * <p>Convenience method that can decode a QR Code represented as a 2D array of booleans. * "true" is taken to mean a black module.</p> * * @param image booleans representing white/black QR Code modules * @param hints decoding hints that should be used to influence decoding * @return text and bytes encoded within the QR Code * @throws FormatException if the QR Code cannot be decoded * @throws ChecksumException if error correction fails */ public function decodeImage($image, $hints=null) { $dimension = count($image); $bits = new BitMatrix($dimension); for ($i = 0; $i < $dimension; $i++) { for ($j = 0; $j < $dimension; $j++) { if ($image[$i][$j]) { $bits->set($j, $i); } } } return $this->decode($bits, $hints); } /** * <p>Decodes a QR Code represented as a {@link BitMatrix}. A 1 or "true" is taken to mean a black module.</p> * * @param bits booleans representing white/black QR Code modules * @param hints decoding hints that should be used to influence decoding * @return text and bytes encoded within the QR Code * @throws FormatException if the QR Code cannot be decoded * @throws ChecksumException if error correction fails */ public function decodeBits($bits, $hints=null) { // Construct a parser and read version, error-correction level $parser = new BitMatrixParser($bits); $fe = null; $ce = null; try { return $this->decode($parser, $hints); } catch (FormatException $e) { $fe = $e; } catch (ChecksumException $e) { $ce = $e; } try { // Revert the bit matrix $parser->remask(); // 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(); $result = $this->decode($parser, $hints); // Success! Notify the caller that the code was mirrored. $result->setOther(new QRCodeDecoderMetaData(true)); return $result; } catch (FormatException $e ) {// catch (FormatException | ChecksumException e) { // Throw the exception from the original reading if ($fe != null) { throw $fe; } if ($ce != null) { throw $ce; } throw $e; } } private function decodeParser($parser,$hints=null) { $version = $parser->readVersion(); $ecLevel = $parser->readFormatInformation()->getErrorCorrectionLevel(); // Read codewords $codewords = $parser->readCodewords(); // Separate into data blocks $dataBlocks = DataBlock::getDataBlocks($codewords, $version, $ecLevel); // Count total number of data bytes $totalBytes = 0; foreach ($dataBlocks as $dataBlock) { $totalBytes += $dataBlock->getNumDataCodewords(); } $resultBytes = fill_array(0,$totalBytes,0); $resultOffset = 0; // Error-correct and copy data blocks together into a stream of bytes foreach ($dataBlocks as $dataBlock) { $codewordBytes = $dataBlock->getCodewords(); $numDataCodewords = $dataBlock->getNumDataCodewords(); $this->correctErrors($codewordBytes, $numDataCodewords); for ($i = 0; $i < $numDataCodewords; $i++) { $resultBytes[$resultOffset++] = $codewordBytes[$i]; } } // Decode the contents of that stream of bytes return DecodedBitStreamParser::decode($resultBytes, $version, $ecLevel, $hints); } /** * <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to * correct the errors in-place using Reed-Solomon error correction.</p> * * @param codewordBytes data and error correction codewords * @param numDataCodewords number of codewords that are data bytes * @throws ChecksumException if error correction fails */ private function correctErrors(&$codewordBytes, $numDataCodewords){ $numCodewords = count($codewordBytes); // First read into an array of ints $codewordsInts =fill_array(0,$numCodewords,0); for ($i = 0; $i < $numCodewords; $i++) { $codewordsInts[$i] = $codewordBytes[$i] & 0xFF; } $numECCodewords = count($codewordBytes)- $numDataCodewords; try { $this->rsDecoder->decode($codewordsInts, $numECCodewords); } catch (ReedSolomonException $ignored) { throw ChecksumException::getChecksumInstance(); } // Copy back into array of bytes -- only need to worry about the bytes that were data // We don't care about errors in the error-correction codewords for ($i = 0; $i < $numDataCodewords; $i++) { $codewordBytes[$i] = $codewordsInts[$i]; } } }
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