cpp/core/src/zxing/oned/UPCEANReader.h

   1 /*
   2  *  UPCEANReader.h
   3  *  ZXing
   4  *
   5  *  Created by Lukasz Warchol on 10-01-21.
   6  *  Copyright 2010 ZXing authors All rights reserved.
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20
  21 #pragma once
  22
  23 #include <zxing/oned/OneDReader.h>
  24 #include <zxing/common/BitArray.h>
  25 #include <zxing/Result.h>
  26 typedef enum UPC_EAN_PATTERNS {
  27         UPC_EAN_PATTERNS_L_PATTERNS = 0,
  28         UPC_EAN_PATTERNS_L_AND_G_PATTERNS
  29 } UPC_EAN_PATTERNS;
  30 namespace zxing {
  31         namespace oned {
  32                 class UPCEANReader : public OneDReader {
  33
  34                 private:
  35                         static const int MAX_AVG_VARIANCE = (int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.42f);
  36                         static const int MAX_INDIVIDUAL_VARIANCE = (int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 0.7f);
  37
  38                         static int* findStartGuardPattern(Ref<BitArray> row);                                                                                                                                   //throws ReaderException
  39
  40                         int* decodeEnd(Ref<BitArray> row, int endStart);                                                                                                                                                //throws ReaderException
  41
  42                         static bool checkStandardUPCEANChecksum(std::string s);                                                                                                                                 //throws ReaderException
  43                 protected:
  44                         static int* findGuardPattern(Ref<BitArray> row, int rowOffset, bool whiteFirst, const int pattern[], int patternLen);   //throws ReaderException
  45
  46                         virtual const int getMIDDLE_PATTERN_LEN();
  47                         virtual const int* getMIDDLE_PATTERN();
  48
  49                 public:
  50                         UPCEANReader();
  51
  52                         virtual int decodeMiddle(Ref<BitArray> row, int startRange[], int startRangeLen, std::string& resultString) = 0;                        //throws ReaderException
  53
  54                         Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row);
  55                         Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row, int startGuardRange[]);
  56
  57                         static int decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset, UPC_EAN_PATTERNS patternType);        //throws ReaderException
  58
  59                         bool checkChecksum(std::string s);                                                                                                                                                                              //throws ReaderException
  60
  61                         virtual BarcodeFormat getBarcodeFormat() = 0;
  62                         virtual ~UPCEANReader();
  63                 };
  64         }
  65 }
  66